Acterna ANT-20 User manual

Acterna ANT-20
Advanced Network Tester ± SONET
As digital communications networks ex-
pand, the number of network operators is
growing too, and not just due to providers
merging across boarders. Different net-
works such as Cellular networks, CATV
and Internet are converging too. Nowadays ,
customers demand next-to-perfect net-
work availability, and a top-level trans-
mission quality has become a given.
ANT-20: Flexibility with
sure future viability
The ANT-20 Advanced Network Tester can
be individually adapted to the latest test
requirements and still leave room for
handling possible future needs. The
instrument thus meets the everchanging
requirements of the operators and manu-
facturers of modern communications net-
works. The modular hardware and soft-
ware concept means that the ANT-20 test
functions are easily adapted to cover a new
scenario.
Always ready for new standards, higher
bitrates and the intelligent system com-
ponents of the future the ANT-20 is at the
forefront of network installation and manu-
facturing applications.
Superior ease of use
The ANT-20 is built around the standard
MicrosoftâWindows
TM
graphical user inter-
face and a large display screen, combining
comprehensive test facilities with superior
ease of use. The instrument is operated
right on screen using a mouse or the op-
tional touchscreen. The graphical user
interface facilitates rapid, application-
oriented instrument settings together with
simultaneous display of major parameters
and test results.
Save time and money through
automation
Test automation is particular important
for acceptance measurements and in de-
velopment and production of network
elements. The test sequencer is a test auto-
mation software package that runs directly
on the ANT-20's built-in PC. Without any
programming backround, you can still
easily create test sequences to meet your
own specific needs.
The test solution that sets
the pace in analyzing digital
communications systems
.Multi-rate transmission
testing from DS1 to OC-48c
.Modular platform offering
SONET, DSn, SDH and ATM
capabilities
.Built-in Pentium PC and
Windows 98 user interface for
easy processing of test results
.Complemented by a lot of
easy-access, automated test
features
.Large, color screen plus
graphical results presentation
Edition: April 2001

Configuration Guide ANT-20 SONET
(up to 2.5 Gbit/s)
Please select
ANT-20 SONET BN 3035/42
&
Touchscreen BN 3035/93.11
&
Mapping DS1 ± VT1.5 BN 3035/90.10
&
Mapping DS2 ± VT6 BN 3035/90.11
&
Mapping DS3 ± STS-1SPE BN 3035/90.12
&
Mapping E1 ± VT2 BN 3035/90.13
&
Mapping STS-3c ± BERT BN 3035/90.03
&
Extended OH Analysis (APS capture, TCM) BN 3035/90.15
&
Drop&Insert/Through mode BN 3035/90.20
&
Mux/Demux M13 BN 3035/90.32
&
Mapping E1 ± C12 BN 3035/90.01
&
Mapping E3 ± C3 BN 3035/90.02
&
Mapping E4 ± C4 (and STS-3c) BN 3035/90.03
&
Mapping DS1 ± C11/C12 BN 3035/90.04
&
Mapping DS3 ± C3 BN 3035/90.05
&
Mapping DS2 ± C2 BN 3035/90.06
&
Mux/Demux 64k/140M BN 3035/90.30
&
BERT 2/8/34/140 BN 3035/90.33
&
OC-1/3, 1310 nm BN 3035/90.43
&
OC-1/3, 1550 nm BN 3035/90.44
&
OC-1/3, 1310/1550 nm BN 3035/90.45
&
OC-1/3/12, 1310 nm BN 3035/90.46
&
OC-1/3/12, 1550 nm BN 3035/90.47
&
OC-1/3/12, 1310/1550 nm BN 3035/90.48
&
OC-48, 1550 nm BN 3035/91.53
&
OC-48, 1310 nm BN 3035/91.54
&
OC-48, 1310/1550 nm BN 3035/91.59
&
Package OC-1/3/12/48, 1310 nm BN 3035/91.17
&
Package OC-1/3/12/48, 1550 nm BN 3035/91.18
&
Package OC-1/3/12/48, 1310/1550 nm BN 3035/91.19
&
Package OC-1/3/12, 1310 nm & OC-48, 1550 nm BN 3035/91.23
&
Optical Power Splitter BN 3035/90.49
&
OC-12c BERT BN 3035/90.90
&
OC-12c ATM BN 3035/90.91
&
OC-12c Virtual Concatenation BN 3035/90.92
&
OC-48c BERT BN 3035/90.93
&
SONET
page 4± 9
SDH
page 9
Optic
page 10 ±13
CONCAT.
page 11±13
2

Please select
Package Jitter/Wander up to 155 Mbit/s BN 3035/91.29
&
Package Jitter/Wander up to 622 Mbit/s BN 3035/91.31
&
Jitter Generator up to 155 Mbit/s BN 3035/90.81
&
Jitter Meter up to 155 Mbit/s BN 3035/90.82
&
Jitter Generator 622 Mbit/s BN 3035/90.83
&
Jitter Meter 622 Mbit/s BN 3035/90.84
&
Wander Generator up to 622 Mbit/s BN 3035/90.85
&
Wander Analyzer up to 622 Mbit/s BN 3035/90.86
&
MTIE/TDEV Analyzer BN 3035/95.21
&
ATM Package PVC&SVC BN 3035/91.81
&
ATM Basic Module BN 3035/90.70
&
ATM SVC Broadband Modul BN 3035/90.80
&
ATM mapping STS-1 BN 3035/90.71
&
ATM mapping E4 BN 3035/90.72
&
ATM mapping DS3-HEC + DS3-PLCP BN 3035/90.73
&
ATM mapping E3 BN 3035/90.74
&
ATM mapping E1 BN 3035/90.75
&
ATM mapping DS1 BN 3035/90.76
&
ATM mapping VC-3 BN 3035/90.77
&
Test Sequencer CATS BASIC BN 3035/95.90
&
Test Sequencer CATS PROFESSIONAL BN 3045/95.95
&
V.24/RS232 Remote Control Interface BN 3035/91.01
&
GPIB/IEEE Remote Control Interface BN 3035/92.10
&
TCP/IP Remote Control Interface BN 3035/92.11
&
Remote Operation BN 3035/95.30
&
Jitter/
Wander
page 14 ± 18
ATM
page 19± 24
AUTO
page 25
Remote
page 25
3

Specifications ANT-20 SONET
ANT-20 mainframe BN 3035/42
Includes:
.Generator and analyzer for electrical STS-1 and STS-3 signals
allowing:
± Simulation and evaluation in the TOH/POH
± Generation and analysis of errors and alarms
± Pointer generator and analyzer
± DSn analysis
.Generator and analyzer for bit error rate tests (BERT) at 6 Mbit/s
with unframed, 1.5 and 45 Mbit/s with framed and unframed test
patterns
.One selectable mapping
.1 extension slot
.Ethernet and USB interface
Generator unit
Digital outputs
Interfaces to Telcordia GR-253, TR-TSY-000499, ANSI T1.102
75 Ocoaxial output, adapter jack selectable from Versacon 9 adapter
system
Bit rates and line codes
DS1.............................. 1544 kbit/s; B8ZS, AMI, CMI
DS2................................... 6312 kbit/s; B8ZS, CMI
DS3................................. 44736kbit/s; B3ZS, CMI
STS-1 . .............................. 51840kbit/s; B3ZS, CMI
STS-3 . ................................... 155520kbit/s; CMI
100 Obalanced output, Bantam jack
Bit rate and line codes
DS1.............................. 1544 kbit/s; B8ZS, AMI, CMI
Output pulses
DS1....................................... DSX-1 compatible
DS2............................................. rectangular
DS3, STS-1 ............................... HIGH,LOW,DSX-3
Bit rate offset ..................................... +500 ppm
Step size ......................................... 0.001 ppm
Clock
Internal clock generation
at all of the bit rates listed above.
Clock stability ...................................... +2 ppm
Synchronisation to external signals
via 100 Obalanced input, Bantam jack:
±Reference clock . . . . . . . . . . . . . . . . . . . 1544 kHz and 2048 kHz
±1544 kbit/s (B8ZS) 2048 kbit/s (HDB)
or
±Receive signal
Clock outputs
±Clock output at frequency of generator signal, approx. 400 mV
(when terminated into 75 O), BNC jack
STS-3 output signal
Generation of a STS-3 signal conforming to Telcordia GR-253,
ANSI T1.105
The STS-3 signal consists of one internal STS-1 tributary signal with
the remaining two tributaries filled with UNEQ.
STS-1 output signal
Generation of a STS-1 signal conforming to Telcordia GR-253,
ANSI T1.105a
Mappings
One selectable STS-1 mapping is included in the basic instrument.
Other mappings can be added as needed.
Content of the selected tributary:
±Framed or unframed DS1 or DS3 test pattern
±M13 multiplex signal (with M13 MUX/DEMUX option)
±External DS1 or DS3 signal (with D&I option)
±Test pattern without stuffing bits (bulk signal to O.181)
Content of non-selected tributaries ............ framed PRBS 2
11
±1
The various mappings are described along with the options.
Generation of pointer actions (Figure 1)
Generation of pointer actions at the STS-1 and VT levels
simultaneously.
±Pointer sequences to T1.105.03 with programmable spacing
±Pointer increment/decrement (continuously repeated)
±Single pointer
±Pointer value setting with or without NDF
Content of TOH and POH bytes
The content of all bytes with the exception of B1/B2/B3 and
H1 to H4 is programmable with any byte or a user defined byte-
sequence p in m in n (p frames in m frames and the entire sequence
repeated n times) can be inserted.
Bytes E1, E2, F1, F2, and byte groups D1 to D3 and D4 to D12:
±Transmission of a PRBS with bit error insertion (selectable in signal
structure)
±Insertion of an external data signal (via V.11 interface; also for K1,
K2, N1 and N2)
Trace identifier
J0,J1,J2 ..........programmable 16 byte ASCII sequence with CRC
J1, J2, additionally .......... programmable 64 byte ASCII sequence
H4 byte .................................4or48bytesequence
4
Manual
pointer
manipulation
or using
pre-defined
standard
sequences
Figure 1:
Pointer actions

Error insertion
Error types ............................. B1,B2,B3parity errors
frame errors, REI-L, REI-P, bit errors in test pattern,
BPV (single errors)
Triggering
Single error or error ratio ..................2610
±3
to 1610
±10
for B1, B3, REI-P . . ......................2610
±4
to 1610
±10
for bit errors ............................1610
±2
to 1610
±10
Step size for mantissa and exponent ........................... 1
Burst error: m anomalies in n periods
For FAS, B1, B2, B3, REI-L, REI-P .............. m=1to4.8610
-6
and n = 2 to 8001 frames or 0.2 s to 600 s
Alarm generation
Dynamic
Alarm types .................... LOS,LOF,AIS-L, RDI-L, LOP-P,
AIS-P, UNEQ-P, PLM-P, RDI-P, RDIEPP,
RDIEPS, RDIEPC, PDI-P
m alarms in n frames . . ................ m=1ton±1,n
max
= 8000
or
t1 alarm active,
t2 alarm passive .....................t1=0to60s,t2=0to600s
Static (on/off)
Alarm types .................... LOS,LOF,AIS-L, TIM-L, RDI-L,
LOP-P, AIS-P, UNEQ-P, PLM-P, TIM-P,
RDI-P, RDIEPP, RDIEPS, RDIEPC, PDI-P
DS1, DS2 and DS3 output signals
Signal structures
±Unframed test pattern
±Framed test pattern (only DS1, DS3)
DS1 frame structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SF, ESF
DS3 frame structure . . . . . . . . . . . . . . . . . . . . . . . . M13, C parity
Error insertion
Bit errors in test pattern ................... error rate, single error
BPV ............................................ single error
DS1Fbit(LOF).................. single error, 2 in 4, 2 in 5, 2 in 6
CRC-6 (ESF) .......................... single error, error rate
DS3Fbit(LOF)........... single error, 2 in 2, 2 in 3, 3 in 3, 3 in 15,
3in16,3in17
P parity, CP parity, FEBE ................ single error, error rate
Error rate ................................. 1610
±2
to 1610
±9
Alarm insertion
DS1...................................... LOF,AIS, YELLOW
DS3........................... LOF,AIS, YELLOW, IDLE, FEAC
FEAC Far-End Alarm and Control Signals
To test that FEAC alarm and status information is correctly
transmitted, the relevant signal codes can be selected and inserted into
the DS3 C-bit frame format.
Test patterns
Pseudo-random bit sequences
PRBS: 2
11
±1, 2
15
±1, 2
20
±1, QRSS 20, 2
11
±1 inv., 2
15
±1 inv.,
2
20
±1 inv., 2
23
±1 inv.
Programmable word
Length ..............................................16bits
Receiver unit
Digital inputs
Interfaces to ....... Telcordia GR-253, TR-TSY-000499, ANSI T1.102
75 Ocoaxial input; adapter jack selectable from Versacon 9 adapter
system
Bit rates and line codes
DS1 ........................... 1544 kbit/s; B8ZS, AMI, CMI
DS2................................. 6312 kbit/s; B8ZS, CMI
DS3 .............................. 44736kbit/s; B3ZS, CMI
STS-1 ............................. 51840kbit/s; B3ZS, CMI
STS-3 .................................. 155520 kbit/s; CMI
100 Obalanced input, Bantam jack
Bit rate and line codes
DS1 ........................... 1544 kbit/s; B8ZS, AMI, CMI
Input levels
DS1 .................................... DSX-1 compatible
DS3, STS-1 ............................ HIGH,LOW,DSX-3
Clock recovery pulling range ........................ +500 ppm
Selectable input gain, CMI coded .....................15to23dB
B3ZS, B8ZS, HDB3, AMI coded ...................15to26dB
Selectable adaptive equalizers for DS3, STS-1 ............... 450ft
DS1 .................... 1310 ft
Monitor input for STS-3 and STS-12 NRZ signals
See chapter Optical Interfaces for details.
STS-3 receive signal
(for signal structure, see under generator unit)
The ANT-20 demultiplexes one selectable STS-1 tributary from STS-3
and feeds it to the internal processor for evaluation.
STS-1, DS1 and DS3 receive signals
Signal structures as for generator unit
Trigger output
75 OBNC connector, HCMOS signal level
Pulse output for received bit errors, transmit frame trigger, transmit
pattern trigger or 2048 kHz reference clock
Automatic modes
Autoconfiguration
Automatically sets the ANT-20 to the input signal. The routine searches
at the electrical and optical interfaces for the presence of standard
asynchronous and STS-N/OC-N signals (GR-253, ANSI T1.102) and
the payload contents in channel 1.
Automatic SCAN function
The SCAN function permits sequential testing of all VT1.5 or VT2
channels in a SONETsignal. The ANT-20 receiver checks for alarms in
the receive signal, the SONETstructure and all channels and for
synchronization of the selected test pattern in all channels. The results
(OK/not OK) for each channel are entered in a matrix. The generator
runs simultaneously and can be used to stimulate the device under test. 5

Automatic TROUBLE SCAN function (Figure 2)
The TROUBLE SCAN function permits sequential testing of all VT1.5
or VT2 channels in a SONETsignal. The ANT-20 receiver checks for
alarms in the receive signal, the SONET structure and all channels.
The results (OK/not OK) for each channel are entered in a matrix.
A detailed alarm history can be displayed by selecting a channel from
the matrix. Only the receive channels are altered during a TROUBLE
SCAN.
AutoScan function (Figure 3)
This automatic ªAutoScanº function allows you to rapidly check the
signal structure, the mapping used, the trace identifier and the payload
± even with mixed mapped signals.
The ANT-20 receiver analyzes the incoming received signal and
provides a clear overview of all the signals present in the composite
receive signal. The variable scan depth setting allows even complex
signal structures to be resolved and displayed clearly. All the displayed
results can be printed out.
Automatic SEARCH function
Channel shifts in the payload may occur when measuring complex
network elements, depending on the configuration of the device under
test. The SEARCH function permits rapid automatic location of the
test channel (VT1.5 or VT2 with defined PRBS) in the payload of a
SONETsignal. The ANT-20 receiver checks for alarms in the receive
signal, the SDH structure and all channels, and for synchronization of
the selected test pattern in all channels. The results (OK/not OK) for
each channel are
entered in a matrix. An OK result indicates that the
corresponding
channel contains the signal searched for. Only the
receive channels are altered during a SEARCH.
Measurement types
Error measurements
Error types ............................. B1,B2,B3parity errors
frame errors, REI-L, REI-P, bit errors in test pattern, BPV
Additionally, for
DS1........................................... CRCerrors
DS3.....................P-parity errors, CP-parity errors, FEBE
Error Count, Error Rate, Intermediate Errors
Performance analysis
ES, SES, EFS, SEFS, UAS are evaluated
In-Service Measurements (ISM)
Simultaneous ISM of the near-end and far-end of a selected path
±Near-end . . . . . . . . . . . . . . . . . . . . . . . . B1, B2, B3, BIP-V, CRC-6
±Far-end . . . . . . . . . . . . . . . . . . . . . . . . . . . . REI-L, REI-P, REI-V
DS1, DS3 events ..................... Fbit, parity, FEBE, C parity
Out-of-Service measurements (OoS)
OoS evaluation using bit errors in test pattern
Analysis of STS-1 and VT pointer actions (Figure 4)
Display of
±Number of pointer operations: Increment, Decrement,
Sum (Increment + Decrement), Difference (Increment ± Decrement)
±Pointer value
Clock frequency measurement
The deviation of the input signal clock frequency from the nominal fre-
quency is displayed in ppm.
Delay measurement
Delay measurements are used for aligning satellite hops and testing the
maximum permitted delay times for storage exchange and cross-
connect systems and for checking the loop circuits in regenerators.
The ANT-20 measures the time taken to transmit the test pattern from
the generator through the section under test and back to the receiver.
6Figure 3: AutoScan
Figure 2: Trouble scan
Figure 4: Graphic pointers. Display showing additional
evaluation of cursor position

The measurement is made on the test patterns in a selected channel, or
in the tributaries (SONET; bulk signal or asynchronous), or on the
selected channel of the lowest hierarchy level of asynchronous multi-
plex systems. To avoid ambiguities in the measurement, two measure-
ment times are provided.
Measurement range
Bit rates from 34 to 155 Mbit/s ........................ 1msto1s
Bit rate 1.5 Mbit/s.................................. 10msto5s
Alarm detection
All alarms are evaluated and displayed in parallel
Alarm types....................................LOS,OOF,LOF
Additionally, for STS . . ...............AIS-L, RDI-L, AIS-P, LOP-P,
NDF-P, RDI-P, UNEQ-P, TIM-P, PLM-P
Additionally, for DS1, DS3...............LSS, AIS, RAI (YELLOW),
IDLE (DS3), FEAC (DS3)
TOH and POH evaluation
Display of complete TOH and POH, e.g. interpretation of
APS information in K1 and K2
For the bytes E1, E2, F1, F2 and byte groups D1 to D3 and D4 to D12:
±BERT using test pattern from the generator unit
±Output of the data signal via the V.11 interface (also for K1, K2)
For the Trace Identifier
±J0 . . . . . . . . . . . . . . . . display of 1 byte or 16-byte ASCII sequence
±J1, J2 . . . . . . . . . . . . . . . . display of 16 or 64-byte ASCII sequence
Measurement interval
Variable ................................... 1second to 99 days
Measurement start .................... manual or automatic timer
(user setting)
Measurement stop .................... manual or automatic timer
(user setting)
Memory for errors, pointer operations and alarms
Resolution of error events and pointers . ...................... 1s
Alarm resolution. ......................................100ms
Memory capacity ......................... upto1million entries
(approx. 100 days at 7 entries per minute)
Acustic indication of Errors and Alarms
Beeper upon any detected error and alarm
Off-line analysis software
The software runs on standard PCs and permits comprehensive
analysis of stored ANT-20 results. After loading the results, the ANT-20
settings during the measurement and the stored results can be accessed.
Zoom and filter functions allow detailed evaluations. The processed
results can be exported in CSV format for importing into other
programs such as Excel or Winword for producing documentation.
Results display and instrument operation
Numerical display
Display of absolute and relative values for all error types
Intermediate results . . . .......................every 1 s to 99 min
Graphical display (histogram) (Figure 5)
Display of errors, pointer operations/values and alarms as bargraphs vs.
time
Units, time axis .....................seconds, minutes, 15 minutes,
hours, days
Tabular display
Display of all alarm and error events with time stamp
Result printout
ANT-20 supports a variety of dot-matrix, inkjet and laser printers
(Windows Print Manager)
Printer interfaces
Serial . . ..........................................V.24/RS232
Parallel ........................... Centronics/EPP/IEEE P 1284
Instrument operation
ANT-20 is operated using the standard MicrosoftâWindowsTM
graphical user interface. Operation is menu-controlled using the mouse
or optional touchscreen. A trackball can also be connected if desired.
Application selection and storage
ANT-20 includes an applications library to which customer-specific
applications can be added. All applications are stored internally and
can be copied to any other ANT-20 via floppy disk. Easy to use filter
functions allow quick selection of the desired application.
Display
A large display screen is available for the ANT-20:
Color TFT screen (touchscreen optional)...........10.4@, 256 colors
Resolution ......................6406480 pixels (VGA standard)
Built-in PC
ANT-20 uses a Pentium PC as internal controller so that standard PC
applications can also be run on the instrument.
RAM capacity .........................................64MB
LS 120 drive .................................... 3.5@, 120 MB
Hard disk drive ........................................ 6GB
USB interface, 10/100 Mbit/s Ethernet interface are included.
Keyboard
Full keyboard for text input, extended PC applications and future
requirements. The keyboard is protected by a fold back cover. An
additional connector is provided for a standard PC keyboard. 7
Figure 5: Histogram results display

External display connector
Simultaneous display with built-in screen
Interface .......................................VGAstandard
PCMCIA interface
Type ............................ PCMCIA2.1typesI,IIandIII
The PCMCIA interface provides acces to GPIB, LANs, etc., via adapter
cards.
Power outage function
In the event of an AC line power failure during a measurement,
ANT-20 saves all data. As soon as the AC line voltage is reestablished,
the measurement is resumed. Previous results are retained and the time
of the power failure is recorded along with other events.
General specifications
Power supply (nominal range of use)
AC line voltage .....................100to127Vand220to240V
AC line frequency ....................................50/60 Hz
Power consumption (all options fitted) . ..............max.230VA
Safety class to IEC 1010-1 ............................... Class I
Ambient temperature
Nominal range of use . . ................41to104 F (+5 to +40 C)
Storage and transport range............±4to158 F (± 20 to +70 C)
Dimensions (w6h6d)inmm ......... approx. 32063506170
in inches ........ approx. 12.6613.866.7
Weight .................................. approx. 10 kg/22 lb
Options
Touchscreen BN 3035/93.11
Upgrade for color display screens
VT1.5 and STM-0 mapping BN 3035/90.10
DS1 in STS-1 and 1.5 Mbit/s in STM-0
Modes ................ asynchronous, byte synchronous (floating)
Error insertion and measurement
Additional error types . ........................... BIP-V,REI-V
Alarm generation, dynamic
Alarm types ............... LOP-V,AIS-V, LOM, UNEQ-V, RDI-V,
RDIEVP, RDIEVS, RDIEVC, RFI-V, PDI-V, PLM-V
m alarms in n frames . . ................ m=1ton±1,n
max
= 8000
or
t1 alarm active,
t2 alarm passive .....................t1=0to60s,t2=0to600s
Alarm generation, static (on/off) and evaluation
Alarm types ...............LOP-V,AIS-V, LOM, UNEQ-V, PLM-V,
TIM-V, RDI-V, RDIEVP, RDIEVS, RDIEVC, RFI-V
Alarm detection only . . ................................ NDF-V
VT6 SPE mapping BN 3035/90.11
(6 Mbit/s unframed/Bulk in STS-1)
STS-1 SPE and STM-0 mapping BN 3035/90.12
Errors and alarms as for mainframe instrument
VT2 SPE and STM-0 mapping BN 3035/90.13
E1 in STS-1 and 2 Mbit/s in STM-0
Modes ................ asynchronous, byte synchronous (floating)
Error insertion and alarm generation as for VT1.5 SPE mapping.
OC-12c/STM-4c Bit Error Tester BN 3035/90.90
OC-12c/STM-4c ATM Testing BN 3035/90.91
OC-12c/STM-4c Virtual Concatenation BN 3035/90.92
Concatenated containers in both contiguous and virtual forms are now
widely used in networks in order to meet the demands for ever higher
bandwidths. The BERT option tests the performance of transmission
paths.
The ATM testing option extends the applications of the ATM module
(BN 3035/90.70). The Virtual Concatenation option provides the
facilities for dealing with these new multiplexing techniques.
OC-48c/STM-16c Error Test (Bulk) BN 3035/90.93
requires one of the following Optics Modules:
BN 3035/91.53 to BN 3035/91.59
The quality of a 2.5 Gbit/s path can be determined very simply using a
bit error rate test across the concatenated container. This is used for
connectivity tests when lining up new paths between ATM switches
and terabit routers via OC-192/STM-64 systems. This measurement is
also used when commissioning DWDM tributaries.
The test signal fills the entire STS-48c SPE or VC-4-16c.
Extended Overhead Analysis BN 3035/90.15
Byte capture TOH and POH
To analyze the TOH/POH functions, it is necessary to capture
individual bytes vs. time, allowing detection of errors or short-term
changes with frame-level precision.
The Capture function is started by a selectable trigger. Values for a se-
lected byte are stored and can be accessed subsequently in a table of
values.
Particularly in capturing the APS sequences, the bytes (K1, K2) are
displayed as an abbreviation of the standard commands.
The function also allows recording of the N1 or N2 bytes for evaluation
of ªTandem Connectionº information.
H4 sequences can also be analyzed very easily.
The results can be printed or exported.
Capture bytes for
STS-1/-3/-3c, el. & opt. .................... allTOH/POHbytes
OC-N, el. & opt. . . . ..................... allTOH/POHbytes,
except A1, A2, B1
Storage depth for a byte ................................... 266
K1,K2................................... 200
Trigger events ................. AIS-L, AIS-V, AIS-P, RDI-L, LOP-P,
editable value in trigger byte
Capture resolution ............................. frame precision
APS time measurement
In synchronous networks, a defined maximum switch-over time is
necessary for the traffic in case of a fault.
To verify compliance with this requirement, the ANT-20 measures the
switch-over time with 1 ms resolution.
The result can be printed.
Criteria for the
time measurement .................. AIS-L, AIS-V, AIS-P, bit error
Max. measurement time. ................................... 2s
Resolution ............................................ 1ms
Allowable error rate for user signal .....................52610
±4
8

Figure 6: Testing hybrid systems with M13 MUX/DEMUX
Drop & Insert BN 3035/90.20
This option provides the following functions:
1. Generator and receiver operate independently
as mapper and demapper. The DS1/DS3 signal from a selected
channel is dropped from the receive signal and output to a
connector. An external or internal DS1/DS3 signal is inserted into
the transmit signal.
2. Through mode: The received signal is looped through the
ANT-20 and re-transmitted (generator and receiver coupled). The
DS1/DS3 signal from a selected channel may be dropped from the
receive signal and output to a connector. An internal DS1/S3 signal
may be inserted into the transmit signal. The ANT-20 can operate
here as an active signal monitor without affecting the signal.
3. Through mode jittering: The looped-through DS1/DS3 or
SONET signal can also be jittered using the Jitter Generator option.
This applies to all jitter frequencies up to 622 Mbit/s depending on
the jitter option fitted.
4. Error insertion in through mode: The looped-through
synchronous signal can be manipulated if required:
± Overwriting bytes in the TOH (except B1, B2, H1 to H3)
± Error insertion
± Alarm generation by programming the TOH
5. Block and Replace (B&R)
For this function, the ANT-20 is looped into the working fiber of a
ring. B&R allows replacement of a synchronous tributary (e.g. STS-1
including TOH, POH and payload) in a OC-N signal. This can then
be measured by the ANT-20 from the ring. By inserting specific
errors, the error thresholds of the APS mechanism in the system can
be tested.
Additional input and output
for tributary signals . . . .......................75O, coaxial BNC;
line codes as for mainframe instrument
Input and output
for balanced tributary signals.............. usebalanced connectors
on mainframe
M13 MUX/DEMUX chain BN 3035/90.32
M13 multiplexers are used in North America in hybrid networks and
synchronous system cross-connects.
This option provides n6DS0 to DS3 multiplex and demultiplex
functions. The output signal is fed to the electrical interface (requires
option BN 3035/90.34) and is available as payload in mappings
(requires option BN 3035/90.12 or BN 3035/90.05)
Alarms and errors can be generated and analyzed.
64k/140M MUX/DEMUX chain BN 3035/90.30
This option provides n664 kbit/s to 140 Mbit/s multiplex and
demultiplex functions. The output signal is fed to the electrical inter-
face and is available as payload in mappings (requires options BN
3035/90.01 to 90.03 or BN 3035/90.13). Alarms and errors can be gene-
rated and analyzed.
BERT (2, 8, 34, 140 Mbit/s) BN 3035/90.33
Signal structure and interfaces for generator and receiver:
Framed and unframed test patterns
Additionally, for coaxial input/output
Bit rate, line code ..................2048, 8448, 34368 kbit/s, HDB3
Bit rate, line code ............................139264 kbit/s, CMI
Additionally, for balanced input/output
Bit rate, line code ............................ 2048 kbit/s, HDB3
9
Asynchronous tributary
OC-M/STM-N
e/o
OC-M/STM-N
e/o
Asynchronous tributary
OC-M/STM-N
e/o
OC-M/STM-N
e/o
OC-M/STM-N
e/o
Asynchronous tributary
OC-M/STM-N
e/o
Jitter
Asynchronous tributary
OC-M/STM-N
e/o
Error/Alarm
OC-M/STM-N
e/o
Cross connect
DS1,
VT1.5
DS3
DS1
OC-N
W-DCS
OC-N
DS1
OC-N
Built-in
M13 MUX/DEMUX
DS1
DS1
DS3
MUX
M13
DS3/DS1
DS1

Optical Interfaces
All of the optical interfaces are intended for single-mode fibers. Acterna
offers a complete line of optical test adapters. Select one test adapter
each for the generator and receiver from the ordering information in
this data sheet. All optical interface options include the required
number of test adapters.
Optical Modules up to 155 Mbit/s
Optical OC-1/3, STM-0/1, 1310 nm BN 3035/90.43
Optical OC-1/3, STM-0/1, 1550 nm BN 3035/90.44
Optical OC-1/3, STM-0/1, 1310 & 1550 nm BN 3035/90.45
Bit rate of TX and RX signal .......................155520kbit/s
additionally, for STS-1/STM-0 mappings ...........51840kbit/s
Line code..................................... scrambled NRZ
Generator unit
The generator meets the requirements of Telcordia GR-253,
ANSI T1.105.06 (ITU-T Rec. G.957, Tables 2 and 3).
Classes LR-1, LR-2, LR-3 (L1.1, L1.2 and L1.3) are covered.
There are three options for adapting to the required wavelength:
Wavelength ............................... 1310 nm, 1550 nm,
1310 & 1550 nm (switchable in the instrument)
Output level ................................. 0dBm+2/±3dB
with 1310 & 1550 nm option .................0dBm+2/±3.5dB
Receiver unit
The receiver unit meets the specifications of Telcordia GR-253, ANSI
T1.105.06 (ITU-T Rec. G.957) and fulfills classes IR-1, IR-2 (S1.1 and
S1.2).
Wavelength range ............................. 1100 to 1580 nm
Input sensitivity ................................±8to±28dBm
(±8 to ±34 dBm typ.)
Display of optical input level
Resolution ............................................ 1dB
155 Mbit/s electrical interface
for connecting the ANT-20 to STM-1/STS-3 monitor points
Line code .................................... scrambled NRZ
Input voltage (peak-peak) ............................ 0.2to1V
Unbalanced input
Connector/impedance . ............................. SMA/50O
Optical Modules up to 622 Mbit/s
Optical OC-1/3/12, STM-0/1/4, 1310 nm BN 3035/90.46
Optical OC-1/3/12, STM-0/1/4, 1550 nm BN 3035/90.47
Optical OC-1/3/12, STM-0/1/4,
1310 & 1550 nm BN 3035/90.48
Bit rate of TX and
RX signal ......................... 155520kbit/s, 622 080 kbit/s
additionally, for STS-1/STM-0 mappings ........... 51840 kbit/s
Line code .................................... scrambled NRZ
Generator unit
The generator meets the requirements of Telcordia GR-253,
ANSI T1.105.06 (ITU-T Rec. G.957, Tables 2 and 3).
Classes LR-1, LR-2, LR-3 (L1.1, L1.2, L1.3, L4.1, L4.2 and L4.3) are
covered.
There are three options for adapting to the required wavelength:
Wavelength ................................1310 nm, 1550 nm,
1310 & 1550 nm (switchable in the instrument)
Output level ................................. 0dBm+2/±3dB
with 1310 & 1550 nm option ................ 0dBm+2/±3.5dB
Generation of STM-4 TX signal
in instruments with STM-1 mappings
The STM-4 TX signal consists of
±four identical STM-1 tributary signals (AU-4), or
±one internally generated STM-1 tributary signal with the other
three tributaries filled with UNEQ.
Generation of OC-12 TX signal
in instruments with STS-1 mappings
The OC-12 TX signal consists of
±one internally generated STS-1 tributary signal with the other
11 tributaries filled with UNEQ or
with STS-3c mapping option BN 3035/90.03, or ATM Module Option
BN 3035/90.70
±one internally generated STS-3c tributary signal with the other
three tributaries filled with UNEQ.
Contents of the OC-12/STM-4 overhead bytes
For all bytes except B1, B2 and H1 to H3:
±the content of each byte is statically programmable or a user
defined byte-sequence p in m in n (p frames in m frames and the
entire sequence repeated n times) can be inserted.
For the E1, E2, F1 bytes and the DCC channels
D1 to D3 and D4 to D12:
±Transmission of a test pattern with bit error insertion (see main-
frame for pattern selection)
±Insertion of an external data signal (via the V.11 interface)
For the K1, K2, N1, N2 bytes:
±Insertion of the data signal via the V.11 interface
For the J0 bytes:
±Transmission of a 16-byte sequence, with CRC
Error insertion
Error types ..............................B1andB2parity error
additionally, for STM-4 ................................MS-REI
for OC-12 ................................. REI-L
Triggering
Single errors or error ratio ...................2610
±3
to 1610
±10
for B1 parity errors . . . ......................2610
±4
to 1610
±10
Burst error: m anomalies in n periods
For FAS, B1, B2, B3, REI-L, REI-P ........... m=1to4.8610
6
and
n = 2 to 8001 frames or 0.2 s to 600 s
Alarm generation, dynamic
Alarm types for STM-4 ................... LOF,MS-AIS, MS-RDI
for OC-12 ......................LOF,AIS-L, RDI-L
m alarms in n frames . . ................. m=1ton-1, n
max
= 8000
or
t1 alarm active, t2 alarm passive .................... t1=0to60s,
t2 = 0 to 600 s
Alarm generation, static (on/off)
Alarm types ....................................... LOS,LOF
additionally, for STM-4 ................ MS-AIS, MS-RDI, RS-TIM
for OC-12 .....................AIS-L, RDI-L, TIM-L
Insertion on/off
10

Receiver unit
The receiver unit meets the specifications of Telcordia GR-253,
ANSI T1.105.06 (ITU-T Rec. G.957) and fulfills classes IR-1, IR-2,
LR-1, LR-2, LR-3 (S1.1, S1.2, S4.1, S4.2, L4.1, L4.2 and L4.3).
Wavelength range ..............................1100 to 1580 nm
Input sensitivity, STM-1/-4, OC-1/3/12 . ............±8to±28dBm
(±8 to ±34 dBm)
Display of optical input level
Resolution .............................................1dB
The ANT-20 demultiplexes one selectable STM-1 or
STS-3c/STS-1 tributary from the STM-4 or OC-12/OC-3
RX signal and feeds it to the internal processor for evaluation.
Measurement types
Error measurements
Error types ....................................B1parity error,
B2 parity error of all STM-1/STS-1/STS-3c signals,
MS-REI/REI-L
Alarm detection
Alarm types .............................. LOS,LOF,OOF,LTI
additionally, for STM-4 ................ MS-AIS, MS-RDI, RS-TIM
for OC-12 ....................AIS-L, RDI-L, TIM-L
Overhead evaluation
±Display of the complete overhead of a selectable
STM-1/STS-1/STS-3c signal
For the E1, E2, F1 bytes and the DCC channels
D1 to D3 and D4 to D12:
±BERT using a test pattern from the generator unit
±Output of the data signal via the V.11 interface
For the K1, K2, N1, N2 bytes:
±Data signal output via the V.11 interface
For the J0 byte:
±Display of 15-byte sequences in ASCII.
155/622 Mbit/s electrical interface
For connecting the ANT-20 to STM-1/OC-3 and
STM-4/OC-12 monitor points
Line code..................................... scrambled NRZ
Input voltage (peak-peak) ............................ 0.2to1V
Coaxial input
Connector/impedance . ............................. SMA/50 O
Concatenated Mappings 622 Mbit/s
Option OC-12c/STM-4c BERT BN 3035/90.90
Only in conjunction with BN 3035/90.46 or BN 3035/90.47 or BN 3035/90.48
Contiguous concatenation signal structure to ANSI T1.105.02 and
G.707.
Error measurement to O.150
Test pattern .............................. PRBS-31, IPRBS-31,
PRBS-23, IPRBS-23,
PRBS-20,
PRBS-15, IPRBS-15
Programmable word
Length ..............................................16bits
Error insertion
Bit errors in test pattern, single error or
error ratio ................................. 1610
±2
to 1610
±9
Error measurement and alarm detection
Bit errors and AIS in test pattern
Option OC-12c/STM-4c
Virtual Concatenation BN 3035/90.92
Only in conjunction with BN 3035/90.90 or BN 3035/90.91
Signal structure
STM-4 to ITU-T G.707
Virtual concatenation with 4 AU-4 pointers
Generation of pointer actions
Manipulations on pointer #1 see mainframe
Setting of delta values for pointers #2, #3, #4
Pointer analysis
For pointer #1.................................. seemainframe
Delta values (maximum, minimum).........................
+40
for pointers #2, #3, #4
POH generation/analysis
POH#1....................................... seemainframe
POH#2,#3,#4..........................static setting of all bytes
except B3
Automatic B3 generation for VC-4 #1, #2, #3, #4
Option OC-12c/STM-4c ATM-Testing BN 3035/90.91
Only in conjuction with BN 3035/90.70 and BN 3035/90.46 or BN 3035/90.47
or BN 3035/90.48
See chapter ªATM optionsº for further detail.
Optical Modules up to 2488 Mbit/s
All optical packages include 4 optical adapters,
STM-16c/OC-48c, STM-4c/OC-12c are not included.
Optical OC-1/3/12/48,
STM-0/1/4/16, 1310 nm BN 3035/91.17
Optical OC-1/3/12/48,
STM-0/1/4/16, 1550 nm BN 3035/91.18
Optical OC-1/3/12/48,
STM-0/1/4/16, 1310 &1550 nm BN 3035/91.19
Optical OC-1/3/12, STM-0/1/4, 1310 nm
OC-48, STM-16, 1550 nm BN 3035/91.23
Optical Modules 2488 Mbit/s
Optical STM-16, OC-48, 1310 nm BN 3035/91.54
Optical STM-16, OC-48, 1550 nm BN 3035/91.53
Optical STM-16, OC-48,
1310/1550 nm switchable BN 3035/91.59
One 2.5 Gbit/s module can be fitted in the extension slot of the
ANT-20.
The optical interfaces meet the specifications of ITU-T Recommen-
dation G.957 (Table 4) and Telcordia TA-NWT-000253 I.6 (Table 4 ± 9,
4 ±10).
Classes S-16.2, L-16.2, L-16.3 (ITU-T) or IR-2, LR-2, LR-3 (Telcordia)
are fulfilled at 1550 nm; classes S-16.1, L-16.1 (G.957) or IR-1,
LR-1 (Telcordia) are fulfilled at 1310 nm. 11

Generator
Optical interfaces
Wavelengths ................................1310 nm, 1550 nm
or 1310/1550 nm switchable
Output level at 1310 nm and 1550 nm . . .......... 0dBm+0/±2dB
Line code .................................... scrambled NRZ
Electrical interfaces
Line code .................................... scrambled NRZ
Output voltage (peak-peak).............................
-
4
0.6 V
Connector/impedance . ............................. SMA/50 O
Clock generator
Internal, accuracy ................................... +2 ppm
Offset . ........................................... +50 ppm
Synchronization from external signal as for mainframe
Generation of STM-16 TX signal
in instruments with STM-1 mappings
The STM-16 signal consists of one or more internally generated
tributaries plus several tributaries filled with UNEQ
(or non-specific UNEQ)
±16 identical STM-1
±one STM-1 tributary and 156UNEQ/non specific
±4 identical STM-4c (Option BN 3035/90.90 required)
±one STM-4c tributary (Option BN 3035/90.90 required)
and 36UNEQ/non specific
Generation of OC-48 TX signals
in instruments with STS-1/STS-3c mappings
The OC-48 signal consists of one or more internally generated
tributaries plus several tributaries filled with UNEQ
(or non-specific UNEQ)
±48 identical STS-1
±one STS-1 tributary and 476UNEQ/non specific
±16 identical STS-3c (Option BN 3035/90.03 required)
±one STS-3c tributary (Option BN 3035/90.03 required)
and 156UNEQ/non specific
±4 identical STS-12c (Option BN 3035/90.90 required)
±one STS-12c tributary (Option BN 3035/90.90 required)
and 36UNEQ/non specific
Contents of STM-16/OC-48 overhead bytes
For all bytes except B1, B2 and H1 through to H3:
±the contents of the bytes in all SOH/TOH are statically
programmable
For the bytes E1, E2, F1 and the DCC channels D1 to D3
and D4 to D12:
±Transmission of a test pattern and bit error insertion
(see mainframe for pattern selection)
±Insertion of an externally-generated data signal
(via V.11 interface)
For the K1, K2, N1, N2 bytes:
±Insertion of an external data signal via the V.11 interface
For the J0 byte:
±Transmission of a 16-bit sequence with CRC
Error insertion
Error types ................................ B1,B2parity errors
Single error or error rate B1 ..................2610
±5
to 1610
±10
B2 ..................2610
±3
to 1610
±10
additionally, for STM-16 .............................. MS-REI
for OC-48 ..................................REI-L
Single error or error rate .....................2610
±3
to 1610
±10
Alarm generation, dynamic
Alarm types for STM-16 .................. LOF,MS-AIS, MS-RDI
for OC-48 .......................LOF,AIS-L, RDI-L
m alarms in n frames . . .................m=1ton-1,n
max
= 8000
or
t1 alarm active, t2 alarm passive .................... t1=0to60s,
t2 = 0 to 600 s
Alarm generation, static (on/off)
Alarm types ....................................... LOS,LOF
additionally, for STM-16 .......................MS-AIS, MS-RDI
for OC-48 ........................... AIS-L, RDI-L
Receiver
Optical interfaces
Wavelength ................................. 1260 to 1580 nm
Line code .................................... scrambled NRZ
Sensitivity ................................ ±28dBmto±8dBm
Input overload .....................................4± 8 dBm
Display of optical input level
Range . .................................. ±30dBmto±8dBm
Resolution .............................................1dB
Electrical interfaces
Line code .................................... scrambled NRZ
Input voltage (peak-peak) ............................ 0.3to1V
Connector/impedance . ............................. SMA/50 O
A selectable STM-1, STS-1 or STS-3c channel is fed to the internal
evaluation circuits by demultiplexing from the input signal.
Error measurement
Error types ............................ B1parity error, MS-REI,
B2 parity sum error over
all STM-1/STS-1/STS-3c channels
Evaluation (bit/block errors) ....................error rate, count
Error event resolution . .................................... 1s
Alarm detection
Alarm types .................................. LOS,LOF,OOF
additionally, for STM-16 ............... MS-AIS, MS-RDI, RS-TIM
for OC-48 .................... AIS-L, RDI-L, TIM-L
Alarm event resolution. ................................ 100ms
SOH/TOH evaluation
Display of complete overhead
For the bytes E1, E2, F1 and the DCC channels D1 to D3
and D4 to D12:
±BERT using test pattern from generator unit
±Output of the data signal via the V.11 interface
For the K1, K2, N1, N2 bytes:
±Data signal output via the V.11 interface
For the J0 byte:
±Display of 15-byte sequences in ASCII format
Concatenated Mapping 2488 Mbit/s
Option OC-48c/STM-16c BERT BN 3035/90.93
Only in conjunction with BN 3035/91.53 to /91.59
Contiguous concatenation signal structure to ANSI T1.105.02 and
G.707.
Error measurement to O.150
Test pattern ...............................PRBS-31, IPRBS-31.
PRBS-23, IPRBS-23
Programmable word
Length ..............................................16bits
Error insertion
Bit errors in test pattern, single error or
error ratio .................................1610
±3
to 1610
±9
12

Alarm generation:
AU-AIS, AIS-C1... AIS-C16,
AU-LOP, LOP-C1... LOP-C16
Error measurement and alarm detection:
AU-AIS, AU-LOP
Bit errors
Automatic Protection Switching
Sensor: MS-AIS, AU-AIS
Solutions for 10 Gbit/s
With the new ANT-10Gig we provide a 10 Gbit/s solution which
covers STM-64 as well as OC-192. The ANT-10Gig allows testing at
the highest line bit rate and in all mappings below and offers
optionally all testing down to n664 kbit/s.
For detailed information please refer to data sheet ªANT-10Gigº.
Further options
Optical Power Splitter (90%/10%) BN 3035/90.49
The Optical Power Splitter is built into the ANT-20.
Three optical test adapters are required to operate it; please indicate
your choice.
The Optical Power Splitter provides an optical monitor point. The
input signal is passed through to the output transparently.
Light energy forwarded .................. approx. 90% (± 0.45 dB)
Light energy coupled out .................. approx. 10% (±10 dB)
The Optical Power Splitter operates in the following ranges:
Wavelengths ............... 1260 to 1360 nm and 1500 to 1600 nm
OLA-15 Optical Attenuator (Variable) BN 2239/01
One application of OLA-15 is in
line-up of optical links, where line
interruptions are simulated for bit
error testing. The device is also useful
when measuring the sensitivity of
optical receivers. With its wide variable
attenuation range and highly accurate
and reproducible attenuation settings,
the OLA-15 is an ideal companion to
the ANT-20.
Calibrated at ............................... 1310 and 1550 nm
Attenuation range ..................................3to60dB
Resolution .......................................... 0.05 dB
See OLA-15 data sheet for details.
13

Jitter and Wander Options
Standards
Jitter generation and jitter/wander analysis are in accordance with
±ITU-T G.783, G.823, G.824, G.825, O.171, O.172
±ETSI ETS 300 462-1 to -6, ETS 300 417-1-1, EN 302 084
±Telcordia GR-253, GR-499
±ANSI T1.101, T1.102, T1.105.03
O.172 Jitter Generator
up to 155 Mbit/s BN 3035/90.81
Fully complies with or exceeds the requirements of ITU-T O.172.
Bit rates
Generates jitter at all bit rates included in the mainframe configuration
up to 155 520 kbit/s.
TX signals ....................alltest patterns and frame structures
included in the mainframe configuration
Built-in modulation generator (sinewave) ..........0.1Hzto5MHz
External modulation . . .......................... 0Hzto5MHz
Jitter amplitude ...................................upto64UI
Clock rate/kHz A1 A2 f1/Hz f2/Hz f3/kHz
1 544
0.5 64 0.1
625 80
2 048 1560 200
6 312 940 120
8 448 6250 800
34 368 27 k 3 500
44 736 35 k 4 500
51 840 27 k 3 500
139 264 39 k 5 000
155 520 39 k 5 000
622 080 * 1.0 256 20 k 5 000
* Requires option BN 3035/90.83
Modulator input (also for BN 3035/90.83)
75 O, BNC socket
Voltage required ................................... 0to2Vpp
Error limits ..................................... asperO.172
O.172 Jitter Generator
622 Mbit/s BN 3035/90.83
Only in conjunction with the following options:
Jitter Generator BN 3035/90.81 and Optical Interface BN 3035/90.46 to /90.48
Jitter modulation of STM-4/OC-12 TX signals.
Built-in modulation generator (sinewave) ......... 0.1Hzto5MHz
External modulation . . .......................... 0Hzto5MHz
Jitter amplitude ..................................upto256UI
Jitter modulation of externally-generated
signals in Through mode
Externally-generated signals can be jittered in Through mode when the
D&I option (BN3035/90.20) is included.
This applies to all bit rates included in the mainframe configuration at
the appropriate electrical and optical interfaces.
Built-in modulation generator (sinewave) ......... 0.1Hzto5MHz
External modulation . . .......................... 0Hzto5MHz
Jitter amplitude .................... asforjitter generator in UIpp
O.172 Jitter Meter
up to 155 Mbit/s BN 3035/90.82
Bit rates
Jitter measurement at all bit rates included in the mainframe
configuration up to 155 520 kbit/s.
Built-in filters
High-pass filters ................. 0.1,2,4,10,20,40,100, 200, 400,
500, 700 Hz,
1, 3, 8, 10, 12, 18, 20, 30, 65, 80, 250 kHz
Low-pass filters.................. 40,60,100, 400, 800, 1300, 3500,
5000 kHz
Filter characteristics . . . ...................... asperITU-TO.172
Measurement ranges
Peak-peak
Range I/Resolution . ................... 0to1.6UIpp/1 mUIpp
Range II/Resolution . ...................0to20UIpp/10 mUIpp
Range III/Resolution .................0to200UIpp/100 mUIpp
RMS
Range I/Resolution . ................... 0to0.8UIpp/1 mUIpp
Range II/Resolution .................. 0to10UIpp/10 mUIpp
Range III/Resolution ................ 0to100UIpp/100 mUIpp
Measurement accuracy ............................ asperO.172
Demodulator output
75 O, BNC socket
Range I (0 to 1.6 UIpp) ...............................1V/UIpp
Range II (0 to 20 UIpp) ............................. 0.1V/UIpp
Range III (0 to 200 UIpp) .......................... 0.01 V/UIpp
O.172 Jitter Meter 622 Mbit/s BN 3035/90.84
Only in conjunction with the following options:
Jitter Meter BN 3035/90.82 and Optical Interface BN 3035/90.46 to /90.48
Measurement range
Peak-peak
Range I/Resolution . ................... 0to6.4UIpp/1 mUIpp
Range II/Resolution . .................. 0to80UIpp/10 mUIpp
Range III/Resolution .................0to800UIpp/100 mUIpp
RMS
Range I/Resolution . ................... 0to3.2UIpp/1 mUIpp
Range II/Resolution . .................. 0to40UIpp/10 mUIpp
Range III/Resolution .................0to400UIpp/100 mUIpp
Measurement accuracy ........................... asperO.172
Demodulator output
75 O, BNC socket
Range I (0 to 6.4 UIpp) ............................ 0.25 V/UIpp
Range II (0 to 80 UIpp) ........................... 0.025 V/UIpp
Range III (0 to 800 UIpp) ........................ 0.0025 V/UIpp
14
A2
UI
pp
A1
f1 f2
log f
f3

Jitter Analysis
Current values (continuous measurement)
Peak jitter value .................................... inUI
pp
Positive peak value . . ................................ inUI
+p
Negative peak value . ................................ inUI
-p
Maximum value (gated measurement)
Maximum peak jitter value .......................... inUI
pp
Maximum positive peak value ........................ inUI
+p
Maximum negative peak value ........................ inUI
-p
Result averaging (switchable)............................ 1to5s
The ANT-20 retains phase synchronicity even when
pointer jitter occurs (phase tolerance to O.172).
Phase hits
The instrument detects when the programmable threshold for positive
and negative jitter values is exceeded.
The result indicates how often this threshold was exceeded.
Setting range for positive and negative thresholds
(depending on measurement range) . . . ..............0.1uptothe
half measurement range
Jitter versus time
This function is used to record variations of jitter with time. It allows
the positive and negative peak values or peak-to-peak values to be
displayed versus time.
Measured values have one second resolution. Measurement duration is
up to 99 days.
By simultaneously evaluating alarms and errors, corellations between
events can be quickly identified.
Clock jitter measurement
The ANT-20 can also measure the jitter on the clock signals (square-
wave) at standard bit rates. All built-in bit rates with electrical inter-
faces up to 155 Mbit/s can be measured.
RMS measurement
G.958 (or G.783 rev.), T1.105.03, GR-253, GR-499
The RMS value is measured on-line and displayed in UI.
The peak jitter and RMS values can be displayed simultaneously;
a graph versus time is available for long-term analysis. An RMS filter
preset is available.
O.172 Wander Generator
up to 622 Mbit/s BN 3035/90.85
Only in conjunction with Jitter Generator option BN 3035/90.81
for up to 155 Mbit/s and BN 3035/90.83 for 622 Mbit/s
Fully complies with or exceeds the requirements of ITU-T O.172
Bit rates
Wander generation at all implemented bit rates up to
622 Mbit/s according to the equipment level of the instrument.
Amplitude range ............................. upto200000UI
Frequency range ..............................10mHz to 10 Hz
Accuracy ........................................ asperO.172
O.172 Wander Analyzer
up to 622 Mbit/s BN 3035/90.86
Only in conjunction with Jitter Meter option BN 3035/90.82
for up to 155 Mbit/s and BN 3035/90.84 for 622 Mbit/s
Fully complies with or exceeds the requirements of ITU-T O.172
For all bit rates up to 622 Mbit/s according to the equipment level of
the instrument.
Other sampling rates in addition to the 30/s rate are available for
detailed analysis versus time:
Sampling rate ± Low-pass filter ±
Test duration ............................. 1/s-0.1Hz-99days
30/s - 10 Hz - 99 h
60/s - 20 Hz - 99 h
300/s - 100 Hz - 5000 s
Amplitude range ............................. +1nsto+10
6
s
Measurement accuracy ............................ asperO.172
Reference signal input
Frequencies ............................1.544, 2.048, 5, 10 MHz
Bit rates .................................. 1.544, 2.048 Mbit/s
Balanced 110 Oconnector ..............................Bantam
Clock input voltage
(sine or square wave) . . ...........................1.0to6.5Vpp
HDB3/B8ZS input voltage ........................ +3V+10%
Coaxial 75 Oconnector .................................. BNC
Clock input voltage
(sine or square wave) . . ............................ 1.0to5Vpp
HDB3/B8ZS input voltage ......................+2.37 V +10%
Accessory: ªActerna TSR-37 Rubidium Timing Signal Referenceº for
wander applications, see end of chapter 15
Figure 7: Jitter peak-to-peak/RMS measurement
Figure 8: Jitter versus time display

Wander Analysis
For options BN 3035/90.86 and BN 3035/90.89
Time Interval Error (TIE)
to O.172 ...............................numerical and graphical
Sampling rates ................. seeunder O.172 Wander Analyzer
for up to 622 Mbit/s
MTIE is additionally determined as a continually updated numerical
value.
To prevent data loss or premature termination of long term
measurements, the ANT-20 checks the remaining space on the hard
disk before the start of the measurement. If necessary, the selected
measurement time can be adjusted.
The TIE values are recorded and are then available for subsequent off-
line MTIE/TDEV evaluations. The values are also saved in .csv format
for documentation or further analysis.
O.172 MTIE/TDEV
Off-line Analysis Software BN 3035/95.21
This option provides extended off-line statistical analysis facilities for
the results of wander measurements.
TIE values results obtained using the ANT-20 are analyzed according
to ETSI ETS 300 462, EN 302 084, ITU-T O.172, G.810 to G.813,
ANSI T1.101, Telcordia GR-1244.
Network synchronization quality is presented graphically using the
MTIE (maximum time interval error) and TDEV (time deviation)
parameters. To ensure correct assessment, the tolerance masks for PRC
(primary reference clock), SSU (synchronization supply unit), SEC
(synchronous equipment clock) or PDH can be superimposed.
The results and masks can be printed out with additional user-defined
comments.
This option allows several TIE results to be displayed simultaneously.
Decisive details during long term measurements disappear
in the multitude of results. An effective zoom function is available for
detailed wander characteristic analysis.
Result printout and export
The results can be printed out and stored internally or on floppy disk.
The file format allows further processing using standard PC software.
Frequency offset and frequency drift rate (ANSI T1.101)
(part of option BN 3035/95.21)
To ensure reliable operation when a clock source is in holdover mode,
the frequency characteristics must not exceed specific deviation limits
relative to an absolute reference source.
To verify this data, the ANT-20 determines the following over the
selected measurement interval:
Frequency offset ...................................... inppm
Frequency drift rate . . . ...............................inppm/s
MRTIE ± Relative MTIE (G.823 and EN 302 084)
(part of option BN 3035/95.21)
If the reference is unavailable (too far away) when analyzing the wander
of asynchronous signals, the MTIE analysis may have a superimposed
frequency offset.
This offset depends on the difference between the signal and local
reference clocks.
The MRTIE measurement subtracts the frequency offset from the result
so that the ªactualº wander characteristic is shown.
Accessory for wander analysis
ªActerna TSR-37 Rubidium Timing Signal
Referenceº ................................. seeendofchapter
Automatic Measurements
The following automatic measurements can be run for all standard bit
rates and interfaces included in the mainframe configuration
(electrical/optical) up to 622 Mbit/s.
Automatic determination of selective Jitter Transfer
Function, JTF
ITU-T G.958, Telcordia GR-499, GR-253, ANSI T1.105.03
The jitter transfer function indicates the ratio of the jitter amplitude at
the output of the device under test to that at the input at various
frequencies.
This determines whether the device under test reduces or amplifies
input jitter and at which frequencies. After a calibration measurement
to minimize intrinsic errors, the ANT-20 outputs a pre-selected jitter
amplitude at various frequencies and measures selectively the jitter
amplitude at the output of the device under test.
The ratio of the amplitudes in dB is the jitter transfer function.
16
Figure 9: On-line wander testing (TIE)
Figure 10: Display of MTIE/TDEV results and comparison
against masks.

The preselected amplitudes correspond to the mask for maximum
permitted input jitter. The jitter frequencies and amplitudes can also be
edited. The calibration values can be saved and used again for other
measurements.
Additional measurement mode
±Transfer MTJ results:
An MTJ measurement is first performed. The measured amplitude
values can then be used automatically as generator values for the
JTF measurement.
The results can be displayed in tabular and graphical form.
The graphical display includes the standard tolerance masks specified
in G.735 to G.739, G.751, G.758 or T1.105.03 and
GR-253. The distance of the measurement points from the tolerance
masks indicates the degree to which the device under test meets the
requirements of the standard.
Tolerance mask violations during the measurement are indicated in the
numerical table.
Freely programmable tolerance masks
The existing tolerance masks for the ANT-20 can be altered as required
to suit requirements that do not conform to specific standards. The
new values selected for jitter frequency and jitter gain/loss are stored
when the application is saved.
Automatic limit testing of Maximum Tolerable Jitter
(Fast Maximum Tolerable Jitter F-MTJ)
ITU-T G.823, G.824, G.825, G.958, ANSI T1.403, T1.404, T1.105.03,
Telcordia GR-253, GR-499
This extremely fast measurement tests the device under test for
conformance to the standard tolerance mask limits for maximum
tolerable jitter.
Jitter frequencies ...................... upto10fixedfrequencies
corresponding to standard tolerance mask
Detection criteria ...............................TSE(bit error),
code error, B2, B3, REI, RDI
Error threshold .............................. 0to999999errors
Settling time ..................................... 0.1to99.9 s
The editable frequency/amplitude values are set sequentially and the
test pattern monitored for the permitted bit error count by the
receiver.
The result of each measurement is shown in a table as the status
message ªOKº or ªFAILEDº.
Automatic determination of Maximum
Tolerable Jitter, MTJ
ITU-T G.823, G.824, G.825, G.958, ANSI T1.403, T1.404, T1.105.03,
Telcordia GR-253, GR-499
The ANT-20 automatically determines the maximum jitter amplitude
tolerated by the device under test at each jitter frequency.
Jitter frequencies................... 20freely selectable frequencies
Detection criteria ...............................TSE(bit error),
code error, B2, B3, REI, RDI
Error threshold .............................. 0to999999errors
Settling time ..................................... 0.1to99.9 s
Gating time......................................... 1to60s
The maximum permissible jitter amplitude is determined precisely and
quickly using a successive method. The ANT-20 determines the exact
limit value.
The method is derived from long experience in the performance of
jitter tolerance tests and is recognized by leading systems manu-
facturers.
The frequency/amplitude result pairs can be displayed in tabular and
graphical form.
The graphical display includes the standard tolerance masks. The
distance of the measurement points from the tolerance masks indicates
the degree to which the device under test meets the requirements of the
standard.
Tolerance mask violations during the measurement are indicated in the
numerical table.
Freely programmable tolerance masks
The existing tolerance masks for the ANT-20 can be altered as required
to suit requirements that do not conform to specific standards. The
new values selected for jitter frequency and amplitude are stored when
the application is saved.
Automatic pointer sequences for analyzing
combined jitter
(available with CATS Test Sequencer option)
Among other things, ITU-T G.783 defines various pointer sequence
scenarios for testing combined jitter (mapping and pointer jitter) at
network elements.
These sequences are normally selected manually and the jitter
measured. ANT-20 allows simple automation of these sequences. The
entire sequence is started and the maximum pointer jitter determined
with a single key press. This saves considerable time spent in setting up
the test and executing the measurement. 17
Figure 12: Maximum Tolerable Jitter testing
Figure 11: Jitter Transfer testing results

Automatic limit testing
of Maximum Tolerable Wander ± MTW
ITU-T G.823, G.824
The ANT-20 tests the device under test for conformance to the
standard tolerance mask limits for maximum tolerable wander.
Measurement points. . . ........ upto10frequency/amplitude values
Detection criteria ........................ TSE(bit error), alarms
Frequency range .....................10mHz to 10 Hz, step 1 mHz
Amplitude range .................. 0.1to200000UI,step: 0.1 UI
The result of each measurement is shown in a table with an
ªOKº or ªFAILEDº message.
Accessory
Acterna TSR-37 DA 3700/00
Rubidium Timing Signal Reference
The TSR-37 is a powerful reference source to quickly measure and test
the synchronization quality of PDH/ SDH/SONET digital networks.
MTIE and TDEV measurements for up to 1000 seconds can be easily
performed without a GPS reference. Coupled with the optional
GPS-FC, the range of observation time can be largely extended to meet
specific requirements.
Provides the reference clock for wander analysis using the ANT-20.
.PDH/SDH/SONET Wander measurement source
.Accuracy at 25 C: +5610
±11
without GPS
51610
±11
with GPS
.12 Outputs; framed and unframed:
5 MHz, 10 MHz, 2.048 kHz, 1.544 kHz, E1, T1
.Compact, robust & lightweight
.External autocalibration input
.Input for GPS or Cesium reference
See Acterna TSR-37 data sheet for details.
18
Figure 13: Maximum Tolerable Wander result display

Service
Layer
ATM
Adaptation
Layer
ATM
Layer
Physical
Layer
Anomaly
and
Defect
Insertion
PRBS Generator
Test Cell
Channel
Cell Editor
Background
Load
Generator
Load, profile
Test signal
AAL-1, AAL-0 Mapper
Framing
Generator
SDH/PDH/SONET
Figure 14:
ATM-BERT generator configuration
Service
Layer
ATM
Adaptation
Layer
ATM
Layer
Physical
Layer
Anomaly
and
Defect
Insertion
Test Cell
Channel
Cell Editor
Background
Load
Generator
Load, profile
Test signal
O.191 Test Information
Framing
Generator
SDH/PDH/SONET
Figure 15: Generator configuration
for performance measurement
Service
Layer
ATM
Adaptation
Layer
ATM
Layer
Physical
Layer
Anomaly
and
Defect
Analyzer
ATM BERT, QoS
AAL-1 Circuit-Reassembly
AAL-1 Performance
ATM
Performance
I.356
Traffic Channel
Analysis and
Load
Measurement
Pointer-
Analyzer
SOH/POH
Monitor
Test signal
Figure 16: Analyzers in the ANT-20 ± A hierarchical overview
ATM Options
ATM module BN 3035/90.70
General
Adjustable test channel from 0 to 150 Mbit/s
In ATM network elements, user channels are monitored with the UPC
(usage parameter control). The sensors of the control instance can be
quickly checked if the bandwidth of a test channel exceeds the set
threshold in the network element. For all measurements, the test
channel in the ANT-20 is set on-line. Settings are made directly with a
control (Figure 15) which shows the bandwidth in Mbit/s, Cells/s or %.
This makes it easy to simulate CBR (Constant Bit Rate) sources.
For each interface, the load setting has a range from 0.01% to 100%.
This corresponds to the load conditions which can occur in the real
world.
Load profiles
A test channel can be generated with typical load profiles in order to
stress network elements or simulate source profiles. In burst mode, for
example, the burst load, burst length and burst period parameters can
be used to simulate a video signal whose key figures correspond to a
real-life signal.
Background load generator
To make a real-time measurement under loaded conditions, additional
background load can be simulated to supplement the test channel
(foreground traffic). The ATM channels are defined using an editor.
The user specifies the repetition rate of the load cell and a sequence of
empty cells. Load channels can be transmitted continuously as a
sequence. The load generator can also be used separately with the test
channel switched off. In this case, the channels and profiles can be
user-specified.
Determining Cell Delay Variation
The ANT-20 includes very powerful tools for measuring delay
parameters. Once a precise measurement has been made, subsequent
measurements usually require only a low-resolution display to allow
rapid pass/fail assessment. Delay values are displayed by the ATM
Traffic Analyzer as a histogram with a minimum class width equal to
160 ns (maximum 335 ms).
As a result, delay fluctuations are shown graphically with the same
resolution. An adjustable offset can be used to maintain measurement
accuracy even if the delay values are high, e.g. over international links.
F4/F5 OAM alarm flow
In accordance with I.610 and the ATM forum standard, the status of
ATM paths and channels is transmitted in the OAM cell stream (fault
management). The ANT-20 generates the alarms VP-AIS, VC-AIS
or VP-RDI, VC-RDI for the foreground channel. The receiver
simultaneously detects alarms and error messages in the channel and
path.
19

The ATM module comprises:
±Generation and analysis of ATM cell streams
±ATM layer cell transfer performance as per ITU-T I.356, O.191
±AAL-1 segmentation/reassembly for circuit emulation
±STM-1/STS-3c with C4 ATM mapping, ITU-T G.707,
ANSI T1.105/107
±F4/F5 fault management OAM flow for AIS and RDI as per ITU-T
I.610, ATM forum UNI 3.1
Generator unit
Bit rates of the framed cell streams ................. 155.520 Mbit/s
Cell scrambler X
43
+1 (ITU-T) ........... canbeswitched on and off
Test cell channel
Adjustable from ............................ 0to149.760 Mbit/s
Header setting ........................................ editor
Load setting in ............................. Mbit/s, Cells/sec, %
Test cells, payload pattern
AAL-0, pseudo-random
bit sequences (PRBS) . . .......................2
11
±1, 2
15
±1, 2
23
±1
AAL-1, pseudo-random
bit sequences (PRBS) . . .......................2
11
±1, 2
15
±1, 2
23
±1
Programmable word, length .............................16bits
Test pattern for ATM performance analysis, with
Sequence number ..................................... 3bytes
Time stamp ......................................... 4bytes
Error correction ......................................CRC-16
Load profiles
Equidistant, setting range ................... 1to10000 cell times
Constant Bit Rate (CBR), setting range . ........... 0.01% to 100 %
Variable Bit Rate (VBR), settings
Peak cell rate .................................. 1%to100%
Mean cell rate .................................. 1%to100%
Burst size ............................... 1to1023 cell times
Burst period ............................ 2to32767celltimes
Error insertion
Physical layer as with ANT-20 basic instrument
ATM layer, AAL:
Correctable and non-correctable header errors
AAL-0, cell payload bit errors
AAL-1, sequence number errors
AAL-1, SAR-PDU bit errors
AAL-1 SNP, CRC errors
AAL-1 SNP, parity errors
Triggering ............................. single errors, error ratio,
N errors in M cells
Alarm generation
Physical layer as with basic instrument, also:
Loss of cell delineation .................................. LCD
ATM layer (for selected test cell channel):
OAM F4/F5 fault flow . ...........VPAIS, VP RDI, VP AIS+VC AIS,
VC AIS, VC RDI, VP RDI+VC RDI
Background load generator
For programming user-defined cell sequences. The sequences can be
transmitted at a selectable repetition rate.
Editor . .................................... 200ATMchannels
Header ....................................... user-selectable
Payload ............................. 1filler byte, user-selectable
Circuit emulation
(for selected test cell channel)
Generation of
an asynchronous channel....................... 1544, 2048, 6312,
8448, 34 368, 44 736 kbit/s,
2048 kbit/s with PCM30 frame structure
ATM channel segmentation ...................AAL-1, ITU-T I.363
Receiver unit
Bit rates of framed cell streams .................... 155.520 Mbit/s
Cell scrambler X
43
+1 (ITU-T) ........... canbeswitched on and off
Measurement types
Error measurement (anomalies), statistics
Detection of the following error types:
Correctable and non-correctable header errors
AAL-0, cell payload bit errors
AAL-1, sequence number errors
AAL-1, SAR-PDU bit errors
AAL-1 SNP, CRC errors
AAL-1 SNP, parity errors
ATM performance analysis
±Cell error ratio
±Cell loss ratio
±Cell misinsertion rate
±Mean cell transfer delay
±2-point cell delay variation
measured between minimum and maximum cell transfer delay
values
±Cell transfer delay histogram
Number of classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Minimum class width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 ns
Maximum class width . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 ms
Settable offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 167 ms
Offset step width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 ms
Alarm detection (defects)
Physical layer as with ANT-20 basic instrument, also:
Loss of cell delineation . .................................. LCD
ATM layer (for selected test cell channel):
OAM F4/F5 fault flow . ...........VPAIS, VP RDI, VC AIS, VC RDI
User channel analysis
Concurrent X-Y chart (load vs. time) for:
±All user cells
±Average cell rate of a selected cell channel
±Peak cell rate of a selected cell channel
Display units .............................. Mbit/s, Cells/sec, %
Channel utilization histogram
±All user cells (ªassigned cellsº)
±A selected cell channel (ªuser cellsº)
Cell distribution of a selected cell channel with classification by:
±User cells
±F5 OAM flow
±F4 OAM flow
±User cells with CLP = 1
Circuit reassembly
(for selected test cell channel)
Reassembly ................................AAL-1, ITU-T I.363
Error measurement on an
asynchronous channel . ................... 1544, 2048, 6312, 8448,
34 368, 44 736 kbit/s,
2048 kbit/s with PCM30 frame structure
20