ADTRAN 3192 HTU-C Instruction Manual

61245004L6-5D Section 61245004L6-5, Issue 4 1
Section 61245004L6-5D
Issue 4, April 2001
CLEI Code #T1L4SNSC _ _
3192 HTU-C
High-bit-rate Digital Subscriber Line
Transceiver Unit for the Central Office
Installation and Maintenance
1. GENERAL
The ADTRAN 3192 HDSL Transceiver Unit for the
Central Office (HTU-C , P/N 1245004L6, is the Central
Office (CO unit used to deploy an HDSL T1 circuit
using 4-wire metallic facilities. The unit occupies one slot
in a CI Wescom 3192 Office Repeater Bay.
DSX-1 signals are provided to and received from the
network while 2B1Q HDSL signals are provided to the
local loop. The ADTRAN HTU-C works in conjunction
with the ADTRAN HDSL Transceiver Unit for the
Remote end (HTU-R and HDSL Range Extender (HRE
to provide a DS1 service up to 36,000 feet on the local
loop.
This HTU-C works with multiple list versions of the
HTU-R and HRE as listed below:
Part Number Description
1244021L1 ............ Low Voltage HTU-R T400 CP
1244022L1 ............ Low Voltage HTU-R SA
1244041L2 ............ Low Voltage T400 HRE
1244042L1 ............ Low Voltage 819A HRE
1244044L1 ............ Low Voltage 439 HRE
1245021L1 ............ Low Voltage HTU-R T200 CP
1245022L1 ............ Low Voltage HTU-R SA
1245026L1 ............ Low Voltage HTU-R CI
1245026L4 ............ Low Voltage HTU-R
1245026L5 ............ Low Voltage HTU-R w/PRM
1245045L1 ............ Low Voltage 239 T1 HRE
Contents
1. GENERAL .............................................................................. 1
2. INSTALLATION ................................................................... 2
3. CONNECTIONS .................................................................... 5
4. HDSL SYSTEM TESTING ................................................... 6
5. CONTROL PORT OPERATION .......................................... 7
6. HDSL DEPLOYMENT GUIDELINES............................... 16
7. TROUBLESHOOTING PROCEDURES ............................ 17
8. MAINTENANCE ................................................................. 17
9. PRODUCT SPECIFICATIONS........................................... 17
10. WARRANTY AND CU¨|OMER SERVICE..................... 17
Appendix A. HDSL Loopbacks.............................................. A-1
Figures
Figure 1. ADTRAN 3192 HTU-C ......................................... 1
Figure 2. HTU-C Switch Arrangement ................................. 4
Figure 3. HTU-C Edge Connector Wiring ............................ 5
Figure 4. HTU-C Span Powering Diagram ........................... 5
Figure 5. HTU-C Bantam Jack Arrangement ........................ 6
Figure 6. HDSL Loopbacks ................................................... 6
Figure 7. RS-232 (DB-9 Pin Assignments ........................... 7
Figure 8. Introductory Menu Screen .................................... 10
Figure 9. HDSL Main Menu Screen .................................... 10
Figure 10. Current System Status Screen .............................. 11
Figure 10A. Current System Status Screen -- HRE ................. 11
Figure 11. Performance History Screen................................. 12
Figure 11A. Performance History Screen -- HRE.................... 12
Figure 12. Loopback Options Screen .................................... 13
Figure 13. Self-Test Options Screen ...................................... 13
Figure 14. Provisioning Screen .............................................. 14
Figure 15. Troubleshooting Display ...................................... 14
Figure 16. Set Time/Date/Circuit ID ..................................... 15
Figure 17. HDSL Deployment Guidelines ............................ 16
Tables
Table 1. SW1 Option Settings ................................................. 2
Table 2. Rotary Switch (SW2 Option Settings ...................... 3
Table 3. Switch 3 (SW3 Option Settings ............................... 3
Table 4. Telecommunications Codes....................................... 3
Table 5. Front Panel Indicators ................................................ 4
Table 6. Power Consumption Worksheet ................................ 5
Table 7. Screen Abbreviations ................................................. 7
Table 8. HDSL Loss Values .................................................. 16
Table 9. Loop Insertion Loss Data ........................................ 16
Table 10. Troubleshooting Guide ............................................ 17
Table 11. HDSL 3192 HTU-C Specifications......................... 18
Table A-1. HDSL Loopback Control Codes ........................... A-1
Table A-2. Inband Addressable Loopback Codes ................... A-2
Trademarks:Anybrandnamesandproductnamesincludedinthisdocumentare
trademarks, registered trademarks, or trade names of their respective holders.
Figure 1. ADTRAN 3192 HTU-C
TX
RX
H
D
S
L
LBK
TM OUT
TXTALM
EN
AMI
FT1
EN
DIS
BZS
T1
DIS
HTU-C
LP1
LP2
DSX
ALM
LBK
LBK
AIS
CDI
RS232
1245004L6
C
L
O
S

2 Section 61245004L6-5, Issue 4 61245004L6-5D
The HTU-C can be deployed in circuits consisting of
one HTU-C and one HTU-R. When deployment
requires the HDSL Range Extender (HRE , the
HTU-C can be deployed with one Low Voltage HRE
(T400, 239, 439, or 819A and one Low Voltage
HTU-R.
NOTE
When deployment requires the use of two
REs, the TU-C can be deployed with two
REs (P/N 1244041L2, 1245045L1,
1244044L1, or 1244042L1) and one TU-R
(P/N 1245026LX).
The HDSL local loop operates as two independent
subsystems each operating over a single twisted pair.
The HTU-C communicates over these two twisted
pairs to the HTU-R. Each subsystem carries half of
the total bandwidth along with a small amount of
overhead used for maintenance and performance
monitoring.
System power and alarm bus connections are made
through the backplane of the 3192 shelf. DSX-1 and
HDSL signals are connected through the wire-wrap
pins or the 64-pin shelf connectors related to each
individual slot.
The HTU-C contains onboard fuses. If a fuse opens,
it supplies a -48 Vdc voltage to the fuse alarm bus and
all front panel indicators will be off. These fuses are
not designed to be field-replaceable.
The 3192 HTU-C uses a DC-to-DC converter to
derive its internal logic and span powering voltages
from the -48 Vdc office supply. The 3192 HTU-C can
span power HREs and HTU-Rs as listed above. When
used with Low Voltage HREs and HTU-Rs, the
HTU-C can be configured to span power the Low
Voltage HTU-R and Low Voltage HRE at either less
than -140 Vdc or at -190 Vdc (for applications
requiring two HREs and an HTU-R . Span powering
voltages meet all requirements of Class A2 voltages as
specified by Bellcore GR-1089-CORE.
Revision History
This practice has been reissued to a incorporate a CLEI code
change.
2. INSTALLATION
After unpacking the unit, inspect it for possible
shipping damage. If damage is discovered, file a
claim immediately with the carrier, then contact
ADTRAN Customer Service (see subsection 10 of this
practice .
The 3192 HTU-C plugs directly into standard CI
Wescom 3192 office repeater shelves. The unit may
be plugged into any of the first 28 slots of the 3192
shelf. No installation wiring is required.
One three-position slide switch (SW1 , one
eight-position rotary switch (SW2 and one
four-position Dipswitch pack (SW3 are used to
configure the mode of operation. Figure 2 shows the
location of these switches.
A definition of each switch is shown in Tables 1, 2,
and 3. Configuration changes must be performed by
manually selecting each option switch. The HTU-C
transfers the local configuration to the HTU-R when
circuit synchronization is achieved. The HTU-R then
sets its configuration to match the HTU-C.
C A U T I O N
C A U T I O N
!
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
1 The CDI is generated by transmitting the framing received from the network while
overwriting the payload with a repeating pattern. For applications where the DS1
is Extended Superframe, the data link is overwritten with a Yellow Alarm that is
interrupted once every second by a 100-millisecond code burst of FE (HEX .
Table 1. SW1 Option Settings
Position Description
AIS................ Upon Customer Loss of Signal (DS1 at the
terminating end of the HDSL circuit, AIS is generated
from the HTU-R toward the network.
LBK .............. Upon Customer Loss of Signal (DS1 at the
terminating end of the HDSL circuit, a logical
network loopback is initiated at the HTU-R.
CDI 1....................... Customer Disconnect Indication. Upon Customer
Loss of Signal (DS1 at the terminating end of the
HDSL circuit, the HTU-R returns DS1 Idle Signal
to the network.

61245004L6-5D Section 61245004L6-5, Issue 4 3
Table 3. SW3 Option Settings
(Default settings are indicated in bold typeface.)
Label Description
LBK TM OUT...... Loopback Timeout enable/disable
DIS........ Disabled
EN ........ Enabled: Loopback
timeout is 120
minutes.
Manual Code select
AMI ...................... Alternate Mark Inversion is selected.
B8ZS .................... B8ZS line code is selected.
Latching Loopback
T1 ......................... Selects full T1 loopback code
sequences.
FT1 ....................... Enables DDS Latching Loopback
operation.
EXT ALM ............ External Alarm enable/disable.
DIS ....... Disabled
EN ......... Enabled
Switch
SW3-1...
SW3-2...................................
SW3-3...................................
SW3-4...
Switch Function Description
SW2-0 0 ................................ Line length from 0-133 feet
of ABAM cable
SW2-1 133 ................................ Line length from 133-266
feet of ABAM cable
SW2-3 266 ................................ Line length from 266-399
feet of ABAM cable
SW2-4 399 ................................ Line length from 399-533
feet of ABAM cable
SW2-5 533 ................................ Line length from 533-655
feet of ABAM cable
Table 2. Rotary Switch (SW2) Option Settings
This rotary switch is used to select operation of the line
buildout equalizer in series with the DSX-1 output.
Electrical Code Compliance
Table 4 shows Telecommunications Codes for the
3192 HTU-C. The 3192 HTU-C complies with the
requirements covered under UL 1459 third edition and
is intended to be installed in an enclosure with an
Installation Code (IC of “B” or “E.”
NOTE
This product is intended for installation (in
Restricted Access Locations) only. Input
current at maximun load is 1 A at -48 Vdc.
Maximum output at overcurrent condition is
160 mA at -188 Vdc.
Powering Options
Using the jumper labelled “P1,” illustrated in Figure
2, the HTU-C can be optioned for two different span
powering modes. By strapping for “LV” span
powering mode, the HTU-C will provide span
powering at less than -140 Vdc. This mode allows for
span powering of circuits without HREs or with one
HRE.
By strapping jumper P1 for the “HV” span powering
mode, the HTU-C will provide span powering at -190
Vdc. This mode allows span powering of circuits
with two HREs and an HTU-R.
Code Input Output
Installation Code (IC) A –
Telecommunication Code (TC) – X
Power Code (PC) F C
Table 4. Telecommunications Codes

4 Section 61245004L6-5, Issue 4 61245004L6-5D
Faceplate Indicators
The HTU-C has five faceplate LEDs which indicate
operational status. Table 5 defines these LEDs.
Shelf Population (based on power
requirements)
Table 6 can be used to determine the maximum
allowable shelf population using the 3192 HTU-C.
Framing
The HTU-C can be optioned to operate either in Auto
Framed or Unframed mode via Jumper P3, illustrated
in Figure 2. The default setting is Auto.
Figure 2. HTU-C Switch Arrangement
HTU-C
1245004L6
TX
LP1
LP2
DSX
ALM
LBK
R
S
2
3
2
RX
H
D
S
L
AIS
LBK
CDI
C
L
O
S
EN
AMI
FT1
EN
DIS
BZS
T1
DIS
LBK
TM OUT
EXT ALM
Description
Indicates five possible states of the quality of the HDSL signals on loop 1:
Off............... No synchronization of HTU-C and HTU-R on loop 1.
Red .............. Poor signal quality on loop 1 (> 10-7 BER .
Yellow ........ Marginal signal quality on loop 1 (≤ 2 dB margin above 10-7 BER .
Green .......... Good signal quality on loop 1 (> 2 dB margin above 10-7 BER .
Blinking ...... An error detected on either end of loop 1 will cause this LED to blink briefly.
Indicates five possible states of the quality of the HDSL signals on loop 2:
Off ................ No synchronization of HTU-C and HTU-R on loop 2.
Red ............... Poor signal quality on loop 2 (> 10-7 BER .
Yellow .......... Marginal signal quality on loop 2 (≤ 2 dB margin above 10-7 BER .
Green ............ Good signal quality on loop 2 (> 2 dB margin above 10-7 BER .
Blinking........ An error detected on either end of loop 2 will cause this LED to blink briefly.
Indicates the following three conditions:
Off ................ Network-side DSX-1 signal is absent or is of a format that does not match the
provisioning of the HDSL circuit.
Blinking........ Bipolar Violation (BPV , frame bit error (SF mode , or CRC error (ESF mode detected
at DSX-1 signal.
On Solid ....... Network-side DSX-1 signal is present and synchronized.
Indicates the following three conditions:
Off ................ No alarm condition detected.
Red ............... Alarm condition detected either locally (HTU-C , or locally and remotely (HTU-C and
HTU-R .
Yellow .......... Remote alarm condition detected.
Indicates three possible loopback states:
Off ................ Unit is not in loopback or armed state.
Blinking........ The loopback arming sequence has been detected. In this state the unit is armed (ready
for loopback but not in loopback.
On Solid ....... Local (HTU-C loopback is active.
Table 5. Front Panel Indicators
Indicator
LP1 ............
LP2 ............
DSX ...........
ALM 3..............
LBK ...........
P1
LV
HV
399
266
DSX-1
LBO
SW2
133
533
0
TXTALM
LBK
TMOUT
EN
AMI
FT1
EN
DIS
BZS
T1
DIS
1234
LBK
AIS
CDI
C
L
O
S
399
266
DSX-1
LBO
SW2 133
533
0
P3 AUTO/UNF

61245004L6-5D Section 61245004L6-5, Issue 4 5
3. CONNECTIONS
The 3192 HTU-C occupies one card slot in a CI
Wescom 3192 Office Repeater Bay. Power and alarm
signals are provided to the card through the backplane
of the shelf. DSX-1 and HDSL loop signals are
connected to the wire-wrap pins or mass termination
shelf connectors corresponding to the slot the unit
occupies. Connections to the DSX-1 pins are intended
for intra-building wiring only. See Figure 3 for
HTU-C edge connector wiring.
The HTU-C is capable of span powering the HTU-R
by applying simplex current to the local loop. From 10
to 125 mA of current is coupled onto the HDSL span
to power the HTU-R and HRE when deployed. The
span powering voltage can be configured to be either
less than -140 or -190 volts with Loop 1 providing the
negative voltage and Loop 2 the return (see Figure 4 .
Alarm Connections
The following alarm signals are connected to the 3192
Alarm Module.
Pin Label Function
H ........... RCV LOS ............. Loss of Signal alarm2
10 .......... FUSE ALARM..... Fuse alarm of -48V supply
2 The LOS alarm will be activated if and only if sealing current has been
present on the HDSL loops.
Alarm processing is actually performed by the 3192
Alarm Module. Refer to the 3192 Alarm Module
documentation for further information.
Figure 3. HTU-C Edge Connector Wiring
Figure 4 HTU-C Span Powering Diagram
1
2
3
4
5
6
7
8
9
10
A
B
C
D
E
F
H
J
K
L
R1 RX DSX (Out to DSX)
R TX DSX (In from DSX)
GND
R1 HDSL Loop 2
-48V
R HDSL Loop 1
Fuse Alarm (to Alarm Module)
T TX DSX (In from DSX)
T1 RX DSX (Out to DSX)
T1 HDSL Loop 2
RCV LOS (to Alarm Module)
Frame Ground
T HDSL Loop 1
HDSL Loops 1 and 2 are dual duplex
loops--capable of simultaneously
transmitting and receiving data.
2B1Q
HDSL SPAN POWER REGULATOR SPAN CURRENT
LOOP 1
LOOP 2
Table 6. Power Consumption Worksheet
Step 1 Enter size of fuse for shelf (Amps ................................................................
(Size required for over current protection (i.e., 100%, 75%, 50% ...............
Step 2 Determine the mix of HDSL circuits in shelf.
Percentage of circuits with an HTU-R only ...................................................
Percentage of circuits with one HRE and an HTU-R ....................................
Percentage of circuits with two HREs and an HTU-R ..................................
Step 3 Determine the current draw of the HDSL circuits.
Multiply (C by 0.2 Amps (with no HRE .....................................................
Multiply (D by 0.3 Amps (with one HRE ...................................................
Multiply (E by 0.51 Amps (with two HREs ................................................
Step 4 Add (F through (H to get total current draw ...............................................
Step 5 Divide (B by (I to get the number of units per shelf ...................................
(A _____ Amps
(B _____ Amps
(C _____ %
(D _____ %
(E _____ %
(F _____ Amps/unit
(G _____ Amps/unit
(H _____ Amps/unit
(I _____ Amps/unit
_____ Units/shelf*
* If the number of units/shelf is greater than or equal to the shelf’s slot availability, full shelf population is allowable.

6 Section 61245004L6-5, Issue 4 61245004L6-5D
DSX-1
HTU-C M R
LOCAL
LOOP
HTU-C M R Network-Side Loopback
HTU-R
HTU-C M R
LOCAL
LOOP
HTU-R Customer-Side Loopback
HTU-R
HTU-C M R
LOCAL
LOOP
HTU-C Customer-Side Loopback
HTU-R
X
X
DS1
DSX-1
HTU-C M R
LOCAL
LOOP
HTU-R Network-Side Loopback and/or
HTU-R NIU Loopback
HTU-R XDS1
DS1
DS1
X
AIS
AIS
X
HRE Customer-Side Loopback
DS1AIS
HTU-C M R
HRE Network-Side Loopback
HTU-R
DS1DSX-1
HRE
AIS
AIS
AIS
X
HTU-C M R HTU-R
HRE
X = Signal Inactive
D = Data Sent
HTU-C M R
Dual HRE Network-Side Loopback
HRE
DSX-1
HRE HTU-R
X
XDS1
AIS
Figure 6. HDSL Loopbacks
4. HDSL SYSTEM TESTING
The ADTRAN HDSL system provides the ability to
monitor the status and performance of the DSX-1
signals, DS1 signals, and HDSL loop signals.
Detailed performance monitoring is provided by the
faceplate-mounted RS-232 Control Port. These
features are valuable in troubleshooting and isolating
any system level problems that may occur at
installation or during operation of the HDSL system.
The following subsections describe additional testing
features.
HTU-C DSX EQ Bantam Jacks
The front panel of HTU-C contains metallic splitting
bantam jacks for access to DSX-1 Tx and Rx from the
local loop. This permits intrusive testing of the
DSX-1 traffic on the HDSL local loop.
Figure 5 shows access provided by the DSX EQ
bantam jacks.
Figure 5. HTU-C Bantam Jack Arrangement
HTU-C Loopbacks
The HTU-C responds to two different loopback
activation processes. First, loopback may be activated
using the craft interface. The Loopback Options
Screen which provides for the HTU-C, HTU-R, and
HRE loopbacks will be described in subsection 5 of
this practice.
Secondly, the HTU-C responds to the industry defacto
standard for HDSL loopbacks. A detailed description
of these loopback sequences is given in Appendix A.
The loopback condition imposed in both cases is a
logic level loopback at the point within the HTU-C
where the DSX-1 signal passes into the HDSL
modulators. Figure 6 depicts all of the loopback
locations possible with ADTRAN HDSL equipment.
In addition to network-side loopbacks, the HTU-C
provides customer-side loopbacks initiated by using
either the terminal control port or in-band loopback
control code sequences (refer to Appendix A of this
practice . In this mode, either an AIS signal or
customer data is supplied to the network.
HDSL
SPAN POWER
DSX-1
T
R
DSX-1
T1
R1
HDSL
LOOP 1
HDSL
LOOP 2
HTU-C
HDSL
LOOP 1
HDSL
LOOP 2
EQ
RX
EQ
TX
HTU-C
DATA
PUMP

61245004L6-5D Section 61245004L6-5, Issue 4 7
5. CONTROL PORT OPERATION
The HTU-C provides a faceplate-mounted DB-9
connector that supplies an RS-232 interface for
connection to a controlling terminal. The pinout of
the DB-9 is illustrated in Figure 7.
The terminal interface operates at data rates from
1.2 kbps to 19.2 kbps. The asynchronous data format
is fixed at 8 data bits, no parity, and 1 stop bit. The
supported terminal type is VT100 or compatible.
NOTE
If you are using a personal computer (PC)
with terminal emulation capability, be sure
to disable any power saving programs.
Otherwise, communication between the PC
and the DSL unit may be disrupted, resulting
in misplaced characters or screen timeouts.
Operation
For abbreviations used in the screen diagrams, see
Table 7.
6
7
8
9
1
2
3
4
5
TXD (Transmit Data)
RXD (Receive Data)
SGN (Signal Ground)
Figure 7. RS-232 (DB-9) Pin Assignments
Table 7. Screen Abbreviations
Definition
Errored Seconds
DSX/DS1
SF.......... Second in which a BPV or frame bit error occurs.
ESF ....... Second in which a BPV or CRC error occurs.
HDSL............ Second in which a CRC error occurs.
Severely errored seconds.
DSX/DS1
SF.......... Second in which 1544 BPVs or 8 frame bit errors occurs.
ESF ....... Second in which 1544 BPVs or 320 CRC errors occur.
HDSL............ Second in which 165 CRC errors occurs.
Unavailable seconds
DSX/DS1...... Second in which there is a loss of signal or sync.
HDSL............ Second in which there is a loss of signal or sync.
Superframe format.
Extended superframe format.
Binary 8 zero substitution.
Alternate mark inversion.
Line build-out.
Bipolar violation.
DSX/DS1...... Second in which a bipolar violation occurs.
T1 Network Interface Unit.
Serial number.
Fifteen-minute period.
Twenty-four-hour period.
Abbreviation
ES .......................
SES .....................
UAS ....................
SF........................
ESF .....................
B8ZS ...................
AMI ....................
LBO ....................
BPV ....................
NIU .....................
S/N ......................
15M ....................
24H .....................

8 Section 61245004L6-5, Issue 4 61245004L6-5D
The screens illustrated in Figures 8 through 16 are for
an HDSL circuit deployed with ADTRAN’s Low
Voltage HDSL technology. The circuit includes an
HTU-C, HTU-R, and HRE. This scenario was chosen
for inclusiveness of functionality. However, other
configurations are possible and their displays will vary
slightly from those shown in this section.
A terminal session is initiated by entering multiple
space bar characters, which are used by the HTU-C to
determine the speed of the terminal. Once the speed
has been determined, an Introductory Menu is
presented, as illustrated in Figure 8.
From the Introductory Menu, the Main Menu may be
selected. The Main Menu provides access to detailed
performance and configuration information, as
illustrated in Figure 9, HDSL Main Menu Screen.
From the Main Menu, the following screens can be
accessed.
1. Current System Status
2. Performance History
3. ADTRAN Information
4. Loopback Options
5. Self-Test
6. Provisioning
7. Troubleshooting
8. Set Time/Date/Circuit ID
The Current System Status screen, illustrated in
Figure 10, provides quick access to status information
for both the HTU-C and HTU-R. Type “H” once to
view the HRE Current System Status screen for the
HRE #1; type “H” a second time to view the Current
System Status screen for HRE #2. The HRE Current
System Status screen is illustrated in Figure 10A.
At each 15-minute interval, the performance
information is transferred to the 15-minute
performance data register accessed from the
Performance History screen. This unit supports the
display of performance information in 15-minute
increments for the last 24-hour period. At each 24-
hour interval, the performance data is transferred into
the 24-hour performance data register also accessed
using the Performance History screen, illustrated in
Figure 11. Type “H” once to view the Performance
History screen for HRE #1; type “H” a second time to
view the HRE Performance History screen for HRE
#2. The HRE Performance History screen is
illustrated in Figure 11A.
Type the letter “Z” at the Current System Status
screen in order to reset the current performance
registers to zero on both the Current System Status
and Performance History screens.
Figures 10 and 10A consolidate current information
for the HDSL, DSX-1, and DS1 interfaces. A key to
the information provided is found in the center of the
screen. Arrows indicate the key applies to both the
HTU-C and HTU-R.
LOSS ................. Pulse Attenuation Measurement 3
SYNC ................ HDSL Loop 1 and Loop 2 Sync
Status
ES 15M/24H ..... Errored Seconds 4
SES 15M/24H ... Severely Errored Seconds 4
UAS 15M/24H .. Unavailable Seconds 4
3LOSS is typically several dB less than the insertion loss measured at 200
kHz. The LOSS measurement is a better indication of the loop’s attenuation
of the 2B1Q signal than the insertion loss measured at a single frequency.
Adtran HDSL can operate on cables with an excess of 30 dB LOSS.
4The first number is for the current 15-minute period and the second is
the current 24-hour period (Loop 1 and Loop 2 numbers are displayed .
An indication of Pair Reversal (if present is given at
the bottom of the first key column. Status and
configuration information for the DS1 and DSX-1
signals is located in the center of the screen near the
bottom.
FRAME ...... T1 Framing Format selected
CODE ......... T1 Line Code selected
LBO ............ Line Build-Out selected (for DSX-1 ;
Customer Signal of 0 or -15 dB (for DS1
NIU ............. Network Interface Unit enabled
BPV ............ Bipolar Violations detected (DSX-1 and DS1
ES ............... Errored Seconds (DSX-1 and DS1
SES ............. Severely Errored Seconds (DSX-1 and DS1
UAS ............ Unavailable Seconds (DSX-1 and DS1
Alarms ........ Lists current alarm condition status

61245004L6-5D Section 61245004L6-5, Issue 4 9
A measure of signal quality for each HDSL loop is
displayed in graphic form on the bottom of the screen.
The measure is from 0 (poor signal quality to 9
(excellent signal quality . Guidelines for interpreting
the indicators are given below.
0 ......... Noise margin is ≤ 0 dB (≈ 10-7 BER
1-8...... Margin measurement above 10-7 BER in dB
9 ......... Margin is ≥ 9 dB (excellent quality above
10-7 BER
Predicting performance based upon signal quality
varies with each loop. Generally, a noise margin of 0
or higher will support a bit error rate (BER of better
than 10-7. ADTRAN has defined the following as
guidelines that correspond to the operation of the
HTU-C faceplate LEDs labeled LP1 and LP2.
Margin < 0 ( Red ................... Poor Loop Quality
0 ≤ Margin ≤ 2 (Yellow ......... Marginal Loop Quality
Margin > 2 (Green ................. Good Loop Quality
The HDSL Loopback and Self-Test Option screens are
illustrated in Figures 12 and 13. Loopbacks and
Self-Test may be evoked or terminated using these
screens. A status of current loopback conditions is
also provided.
The Provisioning screen, illustrated in Figure 14,
contains a display of existing provisioning parameters.
These parameters cannot be changed via software but are
represented on this screen to inform the craftsperson of
the provisioned parameters. Options that can be changed
via hardware settings are marked with an asterisk (* .
The Troubleshooting Display, illustrated in Figure 15,
graphically presents an HDSL circuit. The unit
reviews red, yellow, and blue alarm conditions in the
circuit to automatically predict where a fault is located.
Once a fault location is suspected, the corresponding
portion of the circuit on the screen is highlighted and a
message describing the failure is presented.
The Set Time/Date/Circuit ID menu screen, illustrated
in Figure 16, provides additional provisioning options.
The time parameters are to be entered as military time
(for example, 3:15 p.m. should be entered as
“15:15:00” . The Circuit ID can be entered as a
25-character string of alphanumeric characters.

10 Section 61245004L6-5, Issue 4 61245004L6-5D
Figure 9. HDSL Main Menu Screen
Figure 8. Introductory Menu Screen
CIRCUIT ID: Circuit XXXXX 02/01/99 11:16:27
ADTRAN
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
---------------------- For Information or Technical Support -------------------
Support Hours ( Normal 7am - 7pm CST, Emergency 7 days x 24 hours )
Phone: [phone] / 888.873.HDSL Fax: [phone] Internet: www.adtran.com
-------------------------------------------------------------------------------
HTU-C INFORMATION SIGNAL QUALITY HTU-R INFORMATION SIGNAL QUALITY
----------------- [X] 9 [X] ----------------- [X] 9 [X]
S/N : A1875 L[X] 8 L[X] S/N : L[X] 8 L[X]
CLEI: T1L1B264AA O[X] 7 O[X] CLEI: O[X] 7 O[X]
MANF: 07/98 O[X] 6 O[X] MANF: / O[X] 6 O[X]
P[X] 5 P[X] P[X] 5 P[X]
HRE #1 INFORMATION [X] 4 [X] [X] 4 [X]
------------------ 1[X] 3 2[X] 1[X] 3 2[X]
S/N : j810C2360 [X] 2 [X] [X] 2 [X]
CLEI: T1R5PPYDAA [X] 1 [X] [X] 1 [X]
MANF: 04/98 [X] 0 [X] [X] 0 [X]
AT HTU-C AT HTU-R
Press “M” to view Main Menu.
CIRCUIT ID: Circuit XXXXX 02/01/99 11:19:06
ADTRAN HDSL MAIN MENU
1) CURRENT SYSTEM STATUS
2) PERFORMANCE HISTORY
3) ADTRAN INFORMATION
4) LOOPBACK OPTIONS
5) SELF-TEST
6) PROVISIONING
7) TROUBLESHOOTING
8) SET TIME/DATE/CIRCUIT ID

61245004L6-5D Section 61245004L6-5, Issue 4 11
Figure 10. Current System Status Screen
Figure 10A. Current System Status Screen - HRE
CIRCUIT ID: Circuit XXXXX 02/01/99 11:15:34
LOOP #1 <NETWORK> LOOP #2 CURRENT SYSTEM STATUS LOOP #1 <CUSTOMER>LOOP #2
-------- HRE #1 --------- -------- HRE #1 ---------
00 dB 00 dB <- LOSS -> 31 dB 30 dB
YES YES <- SYNC -> YES YES
000/00000 000/00000 <- ES 15M/24H -> 000/00000 000/00001
000/00000 000/00000 <- SES 15M/24H -> 000/00000 000/00000
000/00012 000/00012 <- UAS 15M/24H -> 000/00016 000/00012
LOOPBACK INACTIVE HRE CUST PAIRS REVERSED LOOPBACK INACTIVE
HRE#1 NET SIGNAL QUALITY N = NETWORK SIDE RECEIVER HRE#1 CUST SIGNAL QUALITY
[X] 9 [X] C = CUSTOMER SIDE RECEIVER [X] 9 [X]
L[X] 8 L[X] L[X] 8 L[X]
O[X] 7 O[X] ____ ____ ____ O[X] 7 O[X]
O[X] 6 O[X] |HTUC| LOOP1 |HRE1| LOOP1 |HTUR| O[X] 6 O[X]
P[X] 5 P[X] | |========N| |C========| | P[X] 5 P[X]
[X] 4 [X] | | | | | | [X] 4 [X]
1[X] 3 2[X] | |========N| |C========| | 1[X] 3 2[X]
[X] 2 [X] |____| LOOP2 |____| LOOP2 |____| [X] 2 [X]
[X] 1 [X] [X] 1 [X]
[X] 0 [X] [X] 0 [X]
Press “Z” to zero registers, “M” for Main Menu
“P” for previous view.
CIRCUIT ID: Circuit XXXXX 02/01/99 11:14:38
LOOP #1 <NETWORK> LOOP #2 CURRENT SYSTEM STATUS LOOP #1 <CUSTOMER>LOOP #2
-------- HTU-C ---------- -------- HTU-R ----------
02 dB 02 dB <-- LOSS --> 32 dB 32 dB
YES YES <-- SYNC --> YES YES
000/00000 000/00000 <-- ES 15M/24H --> 000/00000 000/00000
000/00000 000/00000 <-- SES 15M/24H --> 000/00000 000/00000
000/00012 000/00012 <-- UAS 15M/24H --> 000/00016 000/00016
LOOPBACKS INACTIVE LOOPBACKS INACTIVE
HTU-C SIGNAL QUALITY DSX-1 DS1 HTU-R SIGNAL QUALITY
[X] 9 [X] ------------------------------ [X] 9 [X]
L[X] 8 L[X] ESF <- FRAME -> ESF L[X] 8 L[X]
O[X] 7 O[X] B8ZS <- CODE -> B8ZS O[X] 7 O[X]
O[X] 6 O[X] 0-133 <- LBO -> 0 dB O[X] 6 O[X]
P[X] 5 P[X] N/A <- NIU -> YES P[X] 5 P[X]
[X] 4 [X] 00001 <- BPV -> 00001 [X] 4 [X]
1[X] 3 2[X] 00001 <- ES -> 00001 1[X] 3 2[X]
[X] 2 [X] 00000 <- SES -> 00001 [X] 2 [X]
[X] 1 [X] 00000 <- UAS -> 00000 [X] 1 [X]
[X] 0 [X] NONE <- ALARMS -> NONE [X] 0 [X]
SEALING CURRENT PRESENT
Press “Z” to zero registers, “M” for Main Menu
“H” for HDSL Range Extender #1 (HRE) View.

12 Section 61245004L6-5, Issue 4 61245004L6-5D
Figure 11A. Performance History Screen - HRE
Figure 11. Performance History Screen
CIRCUIT ID: Circuit XXXXX 02/01/99 11:16:06
24 HOUR REGISTERS PERFORMANCE HISTORY 15 MINUTE REGISTERS
--ES-SES-- --ES-SES-----ES-SES--
00001 00000 <--CURRENT--> 000 000
01/31 ----- ----- <-- --> 11:15 000 000 07:15 --- ---
01/30 ----- ----- | | 11:00 001 000 07:00 --- ---
01/29 ----- ----- | | 10:45 --- --- 06:45 --- ---
01/28 ----- ----- | | 10:30 --- --- 06:30 --- ---
01/27 ----- ----- |PREVIOUS | 10:15 --- --- 06:15 --- ---
01/26 ----- ----- | | 10:00 --- --- 06:00 --- ---
01/25 ----- ----- <-- | 09:45 --- --- 05:45 --- ---
| 09:30 --- --- 05:30 --- ---
VIEW 1 : HTU-C DSX-1 | 09:15 --- --- 05:15 --- ---
| 09:00 --- --- 05:00 --- ---
1-->|H|<--3----|H|-----4-->|H|--> | 08:45 --- --- 04:45 --- ---
|T| |R| |T| | 08:30 --- --- 04:30 --- ---
|U| |E| |U| | 08:15 --- --- 04:15 --- ---
<--|C|<--5-----|1|-----6-->|R|<--2 | 08:00 --- --- 04:00 --- ---
| 07:45 --- --- 03:45 --- ---
Press view number to select view --> 07:30 --- --- 03:30 --- ---
Press “H” to view HRE #1 history
Press “B” to go back 8 hours
Press “M” to return to the Main Menu
CIRCUIT ID: Circuit XXXXX 02/01/99 11:25:00
PERFORMANCE HISTORY <VIEW 1 - HRE NETWORK LP1 RECEIVER>
24 HOUR REGISTERS 15 MINUTE REGISTERS
---ES---SES-- --ES-SES----------ES-SES-
00000 00000 <---CURRENT---> 000 000
-1: ----- ----- <-- --> -1: 000 000 -17: 000 000
-2: ----- ----- | | -2: 000 000 -18: 000 000
-3: ----- ----- | | -3: 000 000 -19: 000 000
-4: ----- ----- | | -4: 000 000 -20: 000 000
-5: ----- ----- |PREVIOUS | -5: 000 000 -21: 000 000
-6: ----- ----- | | -6: 000 000 -22: 000 000
-7: ----- ----- <-- | -7: 000 000 -23: 000 000
| -8: 000 000 -24: 000 000
VIEW LOCATION DIAGRAM | -9: 000 000 -25: 000 000
| -10: 000 000 -26: 000 000
-->|H|<-----1->|H|-2------>|H|--> | -11: 000 000 -27: 000 000
|T| |R| |T| | -12: 000 000 -28: 000 000
|U| |E| |U| | -13: 000 000 -29: 000 000
<--|C|<-----3->|1|-4------>|R|<-- | -14: 000 000 -30: 000 000
| -15: 000 000 -31: 000 000
Press view number to select view. --> -16: 000 000 -32: 000 000
Press “H” to view HRE #1 history. Press “B” to go back 8 hours.
Press “M” to return to the Main Menu.

61245004L6-5D Section 61245004L6-5, Issue 4 13
Figure 12. Loopback Options Screen
CIRCUIT ID: Circuit XXXXX 02/01/99 11:17:30
LOOPBACK OPTIONS
_____ _____ _____
|HTU-C| |HRE 1| |HTU-R|
| | LP1 | | LP1 | |
--->|-----|<============>|-----|<============>|-----|<---
| | | | | |
NET | | | | | | CUST
| | LP2 | | LP2 | |
<---|-----|<============>|-----|<============>|-----|--->
| | | | | |
|_____| |_____| |_____|
1) LOOPBACK TO NETWORK AT HTU-C = INACTIVE
2) LOOPBACK TO CUSTOMER AT HTU-C = INACTIVE
3) LOOPBACK TO NETWORK AT HTU-R = INACTIVE
4) LOOPBACK TO CUSTOMER AT HTU-R = INACTIVE
5) LOOPBACK TO NETWORK AT HRE-1 = INACTIVE
6) LOOPBACK TO CUSTOMER AT HRE-1 = INACTIVE
Press corresponding number to toggle loopback option.
Press “M” to return to the Main Menu
Figure 13. Self-Test Options Screen
CIRCUIT ID: Circuit XXXXX 02/01/99 11:17:51
SELF-TEST
Press “S” to initiate HTU-C and HTU-R self-tests.
Press “M” to return to the Main Menu.

14 Section 61245004L6-5, Issue 4 61245004L6-5D
Figure 15. Troubleshooting Display
CIRCUIT ID: Circuit XXXXX 02/01/99 11:18:38
TROUBLESHOOTING DISPLAY
_____ _____ _____
|HTU-C| |HRE 1| |HTU-R|
| | | | | |
| | | | | |
--->| |<=========>| |<=========>| |<---
| | | | | |
NET | | | | | | CUST
| | | | | |
<---| |<=========>| |<=========>| |--->
| | | | | |
| | | | | |
|_____| |_____| |_____|
NO ALARM CONDITIONS
Press “M” to return to the Main Menu
Figure 14. Provisioning Screen
CIRCUIT ID: 1245004L6 CIRCUIT A 01/29/99 00:00:14
PROVISIONING
___________________________________________________
| |
| PROVISIONS SETTINGS |
| ————————————————————— |
| * DSX-1 LINE BUILDOUT = 0-133 FEET |
| DS1 OUTPUT LEVEL = 0 dB |
| * DSX-1/DS1 LINE CODE = B8ZS |
| DSX-1 FRAMING = UNFRAMED |
| DS1 FRAMING = SF |
| * LOOPBACK TIMEOUT = NONE |
| * CUSTOMER LOSS RESPONSE = AIS |
| * LATCHING LOOPBACK MODE = T1 |
| * HTU-C SHELF ALARM = DISABLED |
|___________________________________________________|
Provisions marked with an asterisk (*) can be changed
using switches on the HTU-C. DSX-1 and DS1 framing are
set automatically based on the received T1 framing.
Press “M” to return to the Main Menu.

61245004L6-5D Section 61245004L6-5, Issue 4 15
Figure 16. Set Time/Date/Circuit ID
CIRCUIT ID: Circuit XXXXX 02/01/99 11:12:52
SET TIME/DATE/CIRCUIT ID
1) SET TIME
2) SET DATE
3) SET CIRCUIT ID
Choose an option by pressing the corresponding number.
Press “M” to return to Main Menu.

16 Section 61245004L6-5, Issue 4 61245004L6-5D
6. HDSL DEPLOYMENT GUIDELINES
The ADTRAN HDSL system is designed to provide
DS1 based services over loops designed to comply
with carrier service area (CSA guidelines. CSA
deployment guidelines are given below.
1. All loops are non-loaded only.
2. For loops with 26-AWG cable, the maximum loop
length including bridged tap lengths is 9 kft.
3. For loops with 24-AWG cable, the maximum loop
length including bridged tap lengths is 12 kft.
4. Any single bridged tap is limited to 2 kft.
5. Total bridged tap length is limited to 2.5 kft.
6. The total length of multi-gauge cable containing
26-AWG cable must not exceed the following:
12 - {(3*L26 /(9 - LBTAP } (in kft
L26 = Total length of 26-AWG cable excluding
bridged taps (in kft
LBTAP = Total length of all bridged taps (in kft
This deployment criteria is summarized in the chart
shown in Figure 17.
0
12
11
10
9
8
7
6
5
4
3
2
1
01234
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)
56789
2.5
INVALID HDSL CABLE LENGTHS
2.0 1.5 1.0 0.5 0.0
TOTAL
BRIDGED
TAPLENGTH
(KFT)
VALID HDSL CABLE LENGTHS
Figure 17. HDSL Deployment Guidelines
Loop loss per Kft for other wire is summarized in
Table 8.
Table 8. HDSL Loss Values
(200 kHz cable loss in dB/Kft at 135 Ω)
Cable
Gauge Cable
Type
26
26
24
24
22
22
19
19
PIC
Pulp
PIC
Pulp
PIC
Pulp
PIC
Pulp
68¡ 90¡
3.902
4.030
2.863
3.159
2.198
2.483
1.551
1.817
4.051
4.179
2.957
3.257
2.255
2.45
1.587
1.856
120¡
4.253
4.381
3.083
3.391
2.333
2.629
1.634
1.909
Temperature
Recommended maximum local loop loss information
for PIC cable at 70°F, 135Ω, resistive termination is
provided in Table 9.
Table 9. Loop Insertion Loss Data
Frequency
(Hz) Maximum Loss (dB)
3,000
10,000
50,000
100,000
150,000
200,000
12.0
15.0
25.5
30.0
32.75
35.25
An approximation for the maximum amount of
wideband noise on an HDSL local loop as measured
by a 50 kbps filter is ≤ 31 dBrn.
An approximation for the maximum level of impulse
noise as measured using a 50 kbps filter on an HDSL
loop is ≤ 50 dBrn.
NOTE
These approximations are to be used as guidelines
only and may vary slightly on different loops.
Adhering to the guidelines should produce
performance in excess of 10-7 BER.

61245004L6-5D Section 61245004L6-5, Issue 4 17
7. TROUBLESHOOTING PROCEDURES
Table 10 is a troubleshooting guide for the 3192
HTU-C.
8. MAINTENANCE
The ADTRAN 3192 HTU-C requires no routine
maintenance. In case of equipment malfunction, use
the faceplate Bantam jack connectors to help locate
the source of the problem.
ADTRAN does not recommend that repairs be
performed in the field. Repair services may be
obtained by returning the defective unit to the
ADTRAN Customer Service RMA Department.
Table 10. Troubleshooting Guide
Solution
1. Verify that -48 Vdc power is
properly connected to the shelf.
2. Insert the HTU-C into an operational
slot and check the LED indicators.
When the unit is powered, at least
one LED will be On.
3. If Step 1 passes, but Step 2 fails,
replace the HTU-C.
Condition
All front panel
indicators are Off.
9. PRODUCT SPECIFICATIONS
Product specifications are detailed in Table 11.
10. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within 10
years from the date of shipment if it does not meet its
published specifications or fails while in service (see
ADTRAN Carrier Networks Equipment Warranty,
Repair, and Return Policy and Procedure, document
60000087-10 .
Contact Customer and Product Service (CAPS prior
to returning equipment to ADTRAN.
For service, CAPS requests, or further information,
contact one of the following numbers
ADTRAN Sales
Pricing/Availability
(800 827-0807
ADTRAN Technical Support
Presales Applications/Post-sale Technical Assistance
(800 726-8663
Standard hours: Monday-Friday, 7 a.m. - 7 p.m. CST
Emergency hours: 7 days/week, 24 hours/day
ADTRAN Repair/CAPS
Return for Repair/Upgrade
(256 963-8722
Repair and Return Address
ADTRAN, Inc.
CAPS Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807

18 Section 61245004L6-5, Issue 4 61245004L6-5D
Table 11. HDSL 3192 HTU-C Specifications
Loop Interface
Modulation Type ........................................................ 2B1Q
Mode ........................................................................... Full Duplex, Echo Cancelling
Number of Pairs ......................................................... Two
Bit Rate ....................................................................... 784 kbps per pair
Baud Rate ................................................................... 392K baud per pair
Service Range ............................................................ Defined by Carrier Service Area Guidelines
Loop Loss ................................................................... 36 dB maximum @ 200 kHz
Bridged Taps .............................................................. Single Taps < 2000 feet, Total Taps < 2500 feet
Performance ............................................................... Compliant with Bellcore TA-NWT-001210
HDSL Tx Signal Level .............................................. 13.5 dBm
Input Impedance ......................................................... 135 Ω
Return Loss ................................................................ 20 dB (40 kHz to 200 kHz
Network Interface
4-WIRE DSX-1
DSX-1 Output Level .................................................. 0 dB
DSX-1 Line Build Out ............................................... 0-133 feet ABAM
134-266 feet ABAM
267-399 feet ABAM
400-533 feet ABAM
534-655 feet ABAM
DSX-1 Line Code ....................................................... AMI, B8ZS
DSX-1 Format ............................................................ Auto (ESF, SF , Unframed
DSX-1 Channelization ............................................... Channels 1-12 on HDSL Loop 1, Channels 13-24 on HDSL Loop 2
Power
Tested wit t e ADTRAN Low-Voltage HRE (P/N 1244041L2) and t e ADTRAN Low Voltage HTU-R (1245021L1).
Total Power .................................................................. -48 Vdc @ 200 mA with HTU-R
-48 Vdc @ 300 mA with HTU-R and HRE
-48 Vdc @ 510 mA with HTU-R and two HREs
HTU-C Power Dissipation ......................................... 5.2 watts with HTU-R
6.2 watts with HRE and HTU-R
8.6 watts with two HREs and one HTU-R
Span Power ................................................................. -137 V or -190 Vdc nominal for voltage and current limit at 125 mA +/-5%
(internally generated
Fusing ......................................................................... 1.00 A (not field replaceable
Clock
Clock Sources ............................................................ Internal, DSX-1 Derived
Internal Clock Accuracy ............................................ ± 25 ppm (exceeds Stratum 4 . Meets T1.101 timing requirements.
Tests
Diagnostics ................................................................. Self-Test, Local Loopback (HTU-C , Remote Loopback (HTU-R
Physical
CI Wescom Office Repeater Shelf-Mounted
Dimensions ................................................................. 4.75" High x .69' Wide x 10.5" Deep
Weight ........................................................................ Less than 1 lb.
Environment
Temperature ............................................................... Operating (Standard : -40° to +70°C Storage: -40° to +85°C
Control Port
Interface ...................................................................... RS-232 (DB-9
Terminal Type ............................................................ VT 100 or compatible
Async Speed ............................................................... 1.2 kbps to 19.2 kbps
Data Format ................................................................ 8 data bits, no parity, 1 stop bit
Part Number
HTU-C 3192 Circuit Pack ......................................... 1245004L6

61245004L6-5D Section 61245004L6-5, Issue 4 A-1
HDSL MAINTENANCE MODES
This appendix describes operation of the HDSL
system with regard to detection of in-band and ESF
facility data link loopback codes.
Upon deactivation of a loopback, the HDSL system
will synchronize automatically. Note that the
synchronization process of the HDSL system upon
deactivation of the HRE loopback could take up to 15
seconds, ensuring all system elements are
synchronized.
Loopback Process Description
In general, the loopback process for the HDSL system
elements is modeled on the corresponding DS1 system
process. Specifically, the HTU-C loopback is similar
to an Intelligent Office Repeater loopback and the
HTU-R loopbacks are similar to an inline T1 Repeater
loopback.
In-band control code sequences are transmitted over
the DS1 link by either the unframed or overwrite
method. The HDSL elements respond to either
method.
The unframed method produces periodic control
sequences and the normal DS1 framing bit is omitted.
Appendix A
HDSL LOOPBACKS
The overwrite method produces periodic control
sequences. However, once per frame, the framing bit
overwrites one of the bits in the control sequence.
The unit can detect the loopback activation or
deactivation code sequence only if an error rate of 1E-03
or better is present.
DDS Latching Loopback Operation
If the unit is optioned for FT1 mode, then DDS
Latching Loopback operation is supported as described
in Bellcore TA-TSY-000077, Issue 3, Section 5.1.3.
The HTU-C and any HRE units which are in the
HDSL circuit are treated as Identical Tandem
Dataports and the HTU-R is treated as a Different
Tandem Dataport. For a complete description of the
DDS Latching Loopback codes, refer to Bellcore
TA-TSY-000077, Issue 3, Section 5.1.3.
Loopback Control Codes
A summary of control sequences is given in Tables
A-1 and A-2.
NOTE
In all control code sequences presented, the in-band
codes are shown left-most bit transmitted first, and
the ESF data link codes with right-most bit
transmitted first.
Table A-1. HDSL Loopback Control Codes
Notes: The Source column indicates which side of the interface the control codes are sent from. For example, an (N indicates a network sourced
code while a (C indicates a customer sourced code.
All codes are inband unless labeled ESF-DL
All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.
Source Code Name
(N ................... 3in7 (1110000 .................. Loopback data from network toward network in the HTU-R.
(N ................... 4in7 (1111000 .................. Loopback data from network toward network in the HTU-C.
(N ................... 2in6 (110000 .................... Loopback data from network toward network in first HRE.
(N ................... 3in6 (111000 .................... Loopback data from network toward network in second HRE.
(C .................... 6in7 (1111110 .................. Loopback data from customer toward customer in HTU-C.
(C .................... 5in7 (1111100 .................. Loopback data from customer toward customer in HTU-R.
(C .................... 4in6 (111100 .................... Loopback data from customer toward customer in first HRE.
(C .................... 5in6 (111110 .................... Loopback data from customer toward customer in second HRE.
(N ................... FF1E .................................. Loopback data from network toward network at HTU-C.
(C .................... 3F1E .................................. Loopback data from customer toward customer at HTU-C.
(N ................... FF04 .................................. Loopback data from network toward network at HRE1.
(N ................... FF06 .................................. Loopback data from network toward network at HRE2.
(C .................... 3F04 ................................... Loopback data from customer toward customer at HRE1.
(C .................... 3F06 ................................... Loopback data from customer toward customer at HRE2.
(N ................... FF02 .................................. Loopback data from network toward network at HTU-R.
(C .................... 3F02 ................................... Loopback data from customer toward customer at HTU-R.
(C .................... FF48 (ESF-DL ................. Loopback data from customer toward customer at HTU-R.
(N ................... 1in6 (100000 .................... Loopback data from network toward network at HTU-R.
(N ................... FF48 (ESF-DL ................. Loopback data from network toward network at HTU-R.
(N/C ............... 1in3 (100 .......................... Loopdown everything.
(N/C ............... FF24 (ESF-DL ................. Loopdown everything.
Type
Abbreviated
Wescom

A-2 Section 61245004L6-5, Issue 4 61245004L6-5D
Table A-2. Inband Addressable Loopback Codes
Code and
Function Response
Arm ............................................... 11000 (also known as a 2-in-5 pattern
The HTU-R will loop up towards the network. No AIS or errors will be sent as a result of this
loopback. The HTU-C and HRE will arm.
Disarm........................................... 11100 (also known as a 3-in-5 pattern
The HTU-C and HRE are removed from the armed state. If any of the units are in loopback when the
11100 pattern is received, they will loop down. The LBK LEDs will turn off on all units.
HTU-C Network Loop-up ............. D3D3 (1101 0011 1101 0011
If the units have been armed and no units are in loopback*, the HTU-C will loopup towards the
network, 2 seconds of AIS (all 1s will be sent, 5 seconds of data will pass, and 231 bit errors will be
injected into the DSX-1 signal. As long as the pattern continues to be sent, 231 errors will be injected
every 20 seconds. When the pattern is removed, the unit will remain in loopback. If the pattern is
reinstated, the injection of 231 bit errors will resume at 20-second intervals.
HRE Network Loop-up ................. C741 (1100 0111 0100 0001
If an HRE is present, the units have been armed, the HRE will loopup towards the network, 2 seconds
of AIS (all 1s will be sent, 5 seconds of data will pass, and 10 bit errors will be injected into the
DSX-1 signal. As long as the pattern continues to be sent, 10 errors will be injected every 20 seconds.
When the pattern is removed, the unit will remain in loopback. If the pattern is reinstated, the
injection of 10 bit errors will resume at 20-second intervals.
HRE2 Network Loop-up ............... C754 (1100 0111 0101 0100
If a second HRE is present, the units have been armed, the HRE will loop up towards the network, 2
seconds of AIS (all 1s will be sent, 5 seconds of data will pass, and 200 bit errors will be injected into
the DSX-1 signal. As long as the pattern continues to be sent, 200 errors will be injected every 20
seconds. When the pattern is removed, the unit will remain in loopback. If the pattern is reinstated,
the injection of 200 bit errors will resume at 20-second intervals.
Loopdown ..................................... 9393 (1001 0011 1001 0011
Any HTU-C and HRE units currently in loopback towards the network will loopdown and will retain
the armed state.
Query Loopback ............................ D5D5 (1101 0101 1101 0101
If the units are armed and the HTU-C, HRE, or HTU-R are in network loopback, errors are injected
into the DSX-1 signal upon detection of the query loopback pattern. As long as the pattern continues
to be sent, errors are injected again every 20 seconds. The number of errors injected each time
depends on which unit is in loopback. If the HTU-C is in network loopback, 231 errors are injected,
20 at a time if the HTU-R is in network loopback, 10 at a time if HRE #1 is in network loopback, and
200 at a time if HRE #2 is in network loopback.
Loopback Timeout Override.......... D5D6 (1101 0101 1101 0110
If the units are armed and this pattern is sent, the loopback timeout will be disabled. The timeout
option will be updated on the Provisioning menu of the HTU-R (viewable through the RS-232 port to
None. As long as the units remain armed, the timeout will remain disabled. When the units are
disarmed, the loopback timeout will return to the value it had before the D5D6 code was sent.
Span Power Disable ...................... 6767 (0110 0111 0110 0111
If the units are armed and this pattern is sent, the HTU-C will deactivate its span power supply,
turning off the HTU-R and HRE (if present . As long as the pattern continues to be sent, the span
power supply will remain disabled. When the pattern is no longer being sent, the HTU-C will
reactivate its span power supply, turning the remote unit(s on. All units will retrain and return to the
disarmed and unlooped state.
Note: All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.
* If NIU is enabled, then the HTU-R can be in network loopback when the HTU-C or HRE loopup codes are sent.