Lanex TM-76 User manual

LANEX S.A.
8 Ceramiczna Street
20-150 Lublin
POLAND
tel. [phone]
tel/fax. [phone]
IOA76-1F
May 2009
LANEX S.A., 8 Ceramiczna Street, 20-150 Lublin Service: phone [phone]
POLAND
TM-76, MD-76 MODEM
OPERATING MANUAL

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F I May 2009
Table of contents
1OVERALL CHARACTERISTICS .....................................................................................1
1.1 APPLICATION....................................................................................................................1
1.2 BASIC FEATURES ..............................................................................................................1
1.3 EXAMPLES OF APPLICATION .............................................................................................2
1.4 SYMBOLS AND AVAILABLE VERSIONS...............................................................................3
2CONNECTORS AND INDICATORS ................................................................................5
2.1 INTRODUCTION.................................................................................................................5
2.2 TM-76
MODEM ................................................................................................................5
2.3 MD-76 MODEM (CARD)....................................................................................................7
3FUNCTIONAL DESCRIPTION .........................................................................................8
3.1 DIAGNOSTIC AND SIGNALING SYSTEMS ............................................................................8
3.2 ADDITIONAL CHANNELS ...................................................................................................9
3.3 TEST LOOPS ....................................................................................................................10
3.4 CLOCK TRANSFER...........................................................................................................10
3.5 EVENT LOG.....................................................................................................................11
3.6 MONITORED QUALITATIVE PARAMETERS OF G.703 E1 INTERFACE ................................12
3.7 MONITORED QUALITATIVE PARAMETERS OF E2 OPTICAL INTERFACE.............................13
4INSTALLATION AND OPERATION .............................................................................14
4.1 OPERATING CONDITIONS ................................................................................................14
4.2 INSTALLATION................................................................................................................14
4.3 POWER SUPPLY...............................................................................................................15
4.4 E1/G.703 LINEAR SIGNAL CONNECTION .........................................................................16
4.4.1 TM-76 and MD-76 ................................................................................................16
4.5 CONNECTION TO VT100 TERMINAL OR A COMPUTER WITH THE INSTALLED LANWIN
MANAGEMENT SOFTWARE. .........................................................................................................16
4.6 FIBER OPTIC LINE CONNECTION ......................................................................................17
5OPERATION WITH VT100 TERMINAL.......................................................................20
5.1 APPLICATION..................................................................................................................20
5.2 HARDWARE REQUIREMENTS........................................................................................... 20
5.3 INSTALLATION AND START-UP........................................................................................21
5.4 BEGINNING THE TERMINAL OPERATION ..........................................................................21
5.5 MAIN MENU.................................................................................................................... 23
5.5.1 System....................................................................................................................24
5.5.2 Interfaces-selection ...............................................................................................25
5.5.2.1 Interfaces-options .............................................................................................. 26
5.5.2.2 Set-up ................................................................................................................27
5.5.2.3 15-minute and 24-hour registers ....................................................................... 28
5.5.3 Time periods..........................................................................................................29
5.5.4 Event log................................................................................................................30
5.5.5 Monitoring.............................................................................................................30
5.5.6 Loops .....................................................................................................................31
6DEVICE SET-UP USING LANWIN PROGRAM ..........................................................32
6.1 GLOBAL SET-UP..............................................................................................................32

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OPERATING MANUAL
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6.1.1 Device name ..........................................................................................................33
6.1.2 Setting date and time ............................................................................................. 33
6.1.3 Additional information ..........................................................................................34
6.2 CHANNEL ACTIVITY .......................................................................................................34
6.3 G.826 STATISTICS ..........................................................................................................35
6.3.1 Alarm severity level...............................................................................................37
6.3.2 Alarm thresholds ...................................................................................................38
6.4 TEST LOOPS ....................................................................................................................39
6.5 MONITORING..................................................................................................................40
6.6 LOG ................................................................................................................................41
6.6.1 Event log................................................................................................................41
6.6.2 Event log filter.......................................................................................................41
7TECHNICAL SPECIFICATION......................................................................................43
7.1 ELECTRICAL CHARACTERISTICS OF E1/G.703 INTERFACE ..............................................43
7.2 OPTICAL INTERFACE CHARACTERISTICS .........................................................................44
7.3 MECHANICAL PARAMETERS ...........................................................................................45
7.4 ENVIRONMENTAL REQUIREMENTS..................................................................................45
7.4.1 Operation ..............................................................................................................45
7.4.2 Transport...............................................................................................................45
7.4.3 Storage ..................................................................................................................46
7.5 ELECTROMAGNETIC COMPATIBILITY ..............................................................................46
7.6 POWER SUPPLY...............................................................................................................46
8COMPLETE PRODUCT ...................................................................................................47

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F III May 2009
List of figures
FIGURE 1. TM-76.1 MODEMS USED IN TELEPHONE NETWORKS .................................................2
FIGURE 2. MD-76.1 MODEMS USED TO CONNECT TELEPHONE SWITCHES AND COMPUTER
NETWORKS USING SDH NETWORK ........................................................................................... 2
FIGURE 3. VIEW AND DESCRIPTION OF TM-76 FRONT PANEL....................................................5
FIGURE 4. VIEW AND DESCRIPTION OF DEVICE REAR PANEL......................................................6
FIGURE 5. VIEW OF TM-76 FRONT AND REAR PANEL................................................................7
FIGURE 6. LOOPS ....................................................................................................................10
FIGURE 7. INSTALLATION OF THE DEVICES IN THE FORM OF A CARD IN MD-72
TELECOMMUNICATION RACK, FRONT VIEW. ...........................................................................14
FIGURE 8. INSTALLATION OF THE DEVICES IN THE FORM OF A CARD IN MD-72
TELECOMMUNICATION RACK, REAR VIEW. .............................................................................15
FIGURE 9. INSTALLATION OF THE DEVICES IN THE FORM OF A CARD IN MD-72
TELECOMMUNICATION RACK, SECTIONAL VIEW. ....................................................................15
FIGURE 10. THE PASSWORD ENTRY PANEL................................................................................22
FIGURE 11. THE MAIN MENU ....................................................................................................23
FIGURE 12. A TERMINAL WINDOW EXAMPLE ............................................................................24
FIGURE 13. THE SYSTEM PANEL ...............................................................................................25
FIGURE 14. INTERFACES-SELECTION.........................................................................................26
FIGURE 15. INTERFACES-OPTIONS............................................................................................. 26
FIGURE 16. INTERFACES - SET-UP .............................................................................................27
FIGURE 17. 24-HOUR REGISTERS ...............................................................................................29
FIGURE 18. TIME PERIODS.........................................................................................................29
FIGURE 19. EVENT LOG.............................................................................................................30
FIGURE 20. MONITORING..........................................................................................................31
FIGURE 21. LOOPS ....................................................................................................................31
FIGURE 22. GLOBAL SET-UP......................................................................................................32
FIGURE 23. DEVICE NAME.........................................................................................................33
FIGURE 24. SETTING DATE AND TIME........................................................................................33
FIGURE 25. ADDITIONAL INFORMATION....................................................................................34
FIGURE 26. CHANNEL ACTIVITY ...............................................................................................35
FIGURE 27. G.826 STATISTICS ..................................................................................................36
FIGURE 28. G.826 STATISTICS, ALARM SEVERITY LEVEL .........................................................37
FIGURE 29. G.826 STATISTICS, ALARM THRESHOLDS ...............................................................38
FIGURE 30. TEST LOOPS ............................................................................................................39
FIGURE 31. MONITORING..........................................................................................................40
FIGURE 32. LOG ........................................................................................................................41
FIGURE 33. EVENT LOG FILTER .................................................................................................42

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OPERATING MANUAL
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List of abbreviations
AACK Alarm Acknowledgement
ACK Alarm Acknowledged
AIS Alarm Inhibition Signal
AISL AIS from Local interface
AISR AIS from Remote device
BBE Background Block Error
ES Errored Second
ES15 15 Minutes Errored Second Counter
ES24 24 Hours Errored Second Counter
ESFE Errored Second Far End
ETSI European Telecommunications Standards Institute
GND Ground
ITU-T International Telecommunication Union – Telecommunication Standardization
Sector
LDF Laser Diode Failure
LOESx Loss of Electrical Signal
LOF Loss of Frame
LOOS Loss of Optical Signal
LOS Loss of Signal
NUAL Non-Urgent Alarm
NUALA Non-Urgent Alarm Relay
UALA Urgent Alarm Relay Urgent
RAL Remote Alarm
SES Severely Errored Second
SES15 15 Minutes Severely Errored Second Counter
SES24 24 Hours Severely Errored Second Counter
SESFE Severely Errored Second Far End
SESFE15 15 Minutes Far End Severely Errored Second Counter
SESFE24 24 Hours Far End Severely Errored Second Counter
UA, UAL Urgent Alarm
UAS Unavailability Second
VIOL Violation

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F V May 2009
Operating safety
TM-76.1 and MD-76.1 devices have been designed and tested for the operating safety in
accordance with Class I of PN-EN 60950 standard.
The device has no built-in disconnecting system. Such a system should be installed
outside the device.
When the device is supplied from a DC source, an easily accessible disconnecting
system should be mounted into the fixed cabling outside the device.
Radiation transmitted by the laser transmitter is harmful to eyes!
URZ DZENIE LASEROWEĄ
KLASY 1
CLASS 1 LASER PRODUCT
Never look at the uncovered socket without a plugged-in fiber optic connector.
The Manufacturer is not responsible for the use of the device in a manner non-compliant
with the operating manual.
This Operating Manual is an integral part of the device delivered to the Users.

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 1 May 2009
1 OVERALL CHARACTERISTICS
1.1 Application
TM/MD-76 linear circuit device enables full duplex digital signal transmission at the bit rate
of 2.048 Mbit/s in accordance with ITU-T/G.703 via a fiber optic line.
TM/MD-76 devices can operate with PCM-30 terminal equipment, telephone switches or
other optional signal sources at the bit rate of 2.048 Mbit/s equipped with the same interface.
The devices are completely transparent for the content of the transmitted signal; it can be
a non-framed or framed signal - provided it complies with the requirements of the G.703
recommendation.
All TM-76, MD-76, TM-77, MD-77 and TM-44 devices can operate with each other if
connected via a fiber optic line. If TM-76 or MD-76 is connected to TM/MD-77, TM-44 four-
channel device, transmission with the first E1 channel is possible.
The optical signal can be transmitted via a couple of single-mode or gradient optical fibers
depending on the version of the device.
Transmission via SM fiber can be realized with devices equipped with LASER type
transmitter.
Transmission via MM fiber can be realized only with devices equipped with both LED
and LASER type transmitters.
1.2 Basic features
Table 1. Basic features of the devices
Symbol Electrical ports Optical ports Available versions Management Power supply
MD-76 card to TM-72
telecommunication rack
MD-91
supervision
module in TM-
72 rack
18÷60V DC
TM-76
1 port conforming
to ITU-T-G.703,
2.048 Mbit/s
2 xSC
desktop version RJ-45
connector 18÷60V DC

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 2 May 2009
1.3 Examples of application
TELEPHONE SWITCH
TELPHONE SWITCH
E1 / G. 7 0 3
E1 / G. 7 0 3
Fiber optic line
RS-232
TM-76.1
DCE
4-SG
6-TxD
5-RxD
FIBER OPTIC MODEM E1
/
G.703
A
LCK
RS-232
TM-76.1
DCE
4-SG
6-TxD
5-RxD
FIBER OPTIC MODEM E1/G.703
ALCK
Figure 1. TM-76.1 modems used in telephone networks
TELEPHONE SWITCH
TELEPHONE SWITCH
ROUT ER
ROUT ER
ETHERNET
ETHERNET
4 x E1 / G.703
4 x E1 / G.703
G.7 0 3
G.7 0 3
G.7 0 3
Fiber optic line
MD-76
MD-76
MD-76
MD-76
Fiber optic line
RI NG SDH
TRANSFER TERM INAL EQUIPMENT
TRANSFER TERM INAL EQUIPMENT
MD-76.1
ACK
RAL
10
ACK
-3
UA
LOF
NUA
10
ALACK
-6
LOOSLDF
LOES
MD- 76.1
A
CK
R
A
L
10
A
CK
-3
U
A
LOF
NU
A
10
A
LACK
-6
LOOS
LDF
LOES
MD-76.1
A
CK
R
A
L
10
A
CK
-3
U
A
LOF
NU
A
10
A
LACK
-6
LOOSLDF
LOE S
MD-76.1
ACK
RAL
10
ACK
-3
UA
LOF
NUA
10
ALACK
-6
LOOSLDF
LOES
Figure 2. MD-76.1 modems used to connect telephone switches and computer networks using
SDH network

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
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1.4 Symbols and available versions
List of abbreviations:
SH – short haul
LH – long haul
MM – designed for operate with multi-mode fiber
SM - designed for operate with single-mode fiber
WDM – version to operate with single fiber, using WDM (Wavelength Division Multiplexing)
technology
1310 nm - transmitter working with 1310 nm wavelength, receiver working with 1310 nm
wavelength
1550 nm - transmitter working with 1550 nm wavelength, receiver working with 1550 nm
wavelength
1310/1550 nm - transmitter working with 1310 nm wavelength, receiver working with 1550 nm
wavelength
1550/1310 nm - transmitter working with 1550 nm wavelength, receiver working with 1310 nm
wavelength
E1 modem is available in two versions:
• as a desktop version in a metal casing, symbol TM-76,
• as a card installed in TM-72 telecommunication rack to cooperate with another TM-72
or MD-76 card.
A symbol example:
TM-76.1-3 – desktop modem equipped with laser transmitter of 1310 nm wave length.
Haul:
1 - short (SH)
2 - long (LH)
TM - 76.1 - X - Y
Type of optical transmitter:
3 - 1310 nm SM
4 - 1550 nm SM
5 - WDM 1310/1550 nm SM
6 - WDM 1550/1310 nm SM
Production version
Type of mechanical design:
TM - desktop version
MD - rack version

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
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Note: 1. Each time a symbol containing the letter "X" instead of its corresponding
digit is used in the Manual, it means that the feature specified in this part
of the symbol is insignificant concerning the discussed parameter and may
be equal to any value from the above-mentioned range. However,
the device symbol indicated in a sales order must contain only digits
following the manufacturer symbol "TM" or "MD" (all features of
the ordered device must be specified).

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 5 May 2009
2 CONNECTORS AND INDICATORS
2.1 Introduction
Device versions differ from each other with the type of the used optical elements.
There are no differences in the mechanical structure.
2.2 TM-76 modem
6-Tx
5-Rx
4-SG
FIBER OPTIC MODEM E1/G.703
AACK
TM-76.1
RS-232
LOES
LOOS
1010
-6
-3
RAL
ACK ACK
LDF LOF
UA
NUA
1
2
3
4
1 - power supply indication diode
2 - supervision connector
3 - group of signaling diodes:
LOES – loss of E1 interface input signal
LOOS – loss of optical receiver input signal
LDF– laser diode failure (loss of optical transmitter output power)
LOF – loss of frame synchronization of received signal
10-3 – error rate 10-3 exceeded
10-6 – error rate 10-6 exceeded
RAL – remote alarm
group of alarm condition signaling diodes:
UA – urgent alarm
ACK – acknowledgement of urgent alarm
NUA – non-urgent alarm
ACK – acknowledgement of non-urgent alarm
4- AACK – alarm acknowledgment button
Figure 3. View and description of TM-76 front panel
The device is equipped with V.28 interface enabling modem management from VT100 terminal
level. The interface is described in Table 2.

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 6 May 2009
Table 2. Description of RS-232 / V.28 DCE connector outputs (RJ-45 type)
Pin Description
4 SGND
6 Tx OUT
5 Rx IN
RS-232 cable should be used to connect TM-76 multiplexer to a terminal. Table 3 specifies
the required list of cable connections.
Table 3. PC computer (terminal) to TM-76 device connecting cable specification
TM-76.1 modem side PC computer or terminal side
RJ-45 connector Pin symbol DSUB-9 female connector DSUB-25 female
connector
6 Tx 2 3
5 Rx 3 2
RTS – CTS 7 – 8 4 – 5
DTR - DSR 4 – 6 6 – 20
4 SGND 5 7
1 - optical receiver output
2 - optical receiver input
3 - 120 ohm symmetric linear signal input/output Ω- DB-9 connector
4 - connector with a screw mounting to connect 18÷60V DC power supply source
5 - grounding terminal
Figure 4. View and description of device rear panel
36 60 VDC
_
.
.
52
97
18

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 7 May 2009
2.3 MD-76 modem (card)
MD-76.1
MD-76.1
52 97
AACK
4
5
6
1
2
3
Figure 5. View of TM-76 front and rear panel
1 - power supply indication diode
2 - group of signaling diodes:
LOES – loss of input electrical signal
LOOS – loss of optical receiver input signal
LDF– laser diode failure (loss of optical transmitter output power)
LOF – loss of frame synchronization of received signal
10-3 – error rate 10-3 exceeded
10-6 – error rate 10-6 exceeded
RAL – remote alarm
group of alarm condition signaling diodes:
UA – urgent alarm
ACK – acknowledgement of urgent alarm
NUA – non-urgent alarm
ACK – acknowledgement of non-urgent alarm
3- AACK – alarm acknowledgment button
4- Optical receiver input
5- Optical receiver output
6- 120 ohm symmetric linear signal input/output Ω- DB-9 connector

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
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3 FUNCTIONAL DESCRIPTION
TM-76 and MD-76 devices perform the following functions:
1. processing of electrical signals at the bit rate of 2.048 Mbit/s in HDB-3 three-level code into
a digital signal in the natural code;
2. multiplexing of four data streams at the bit rate of 2.048 Mbit/s according to the G.742
recommendation. TM-76 and MD-76 use a single data channel.
3. encoding in 5B/6B code;
4. processing of an electrical signal into an optical one;
5. receiving of an optical signal and processing it into an electrical signal;
6. decoding of a data stream encoded in 5B/6B code;
7. demultiplexing of four data streams at the bit rate of 2.048 Mbit/s. TM-76 and MD-76 use
a single data channel.
8. encoding of a data stream at the bit rate of 2.048 Mbit/s in HDB-3 code;
9. control and signaling of the basic parameters of the multiplexer operation and generation
of alarms in the event of failures.
3.1 Diagnostic and signaling systems
TM-76 and MD-76 type devices automatically control the parameters of E1/G.703 local
interface and linear optical signal, and detect and signalize the following conditions and values:
E1 G.703, G.704 local interface:
• loss of interface input signal
• receiving of AIS signal coming from E1 interface
• receiving of AIS signal coming from demultiplexer
• HDB3 code violation
Linear optical interface:
• loss of linear input signal
• loss of frame synchronization of received signal
• block error rates 1x10-3 and 1x10-6 exceeded
• receiving of the AIS bit in G.742 frame signaling a remote alarm
An alarm condition is indicated as follows:
• appropriate local interface LED is switched on: LOES
• appropriate optical interface LED is switched on: LOOS, LOF, 10-3, 10-6, RAL, LDF
• shorting of UALA, NUALA alarm relay terminals in TM-72 telecommunication rack.
When a failure is detected, a "non-urgent" alarm – NUA (indicating a failure condition,
which does not interrupt transmission) or an "urgent" alarm – UA (meaning a transmission
interruption - an immediate operator's response is necessary) is generated.
MD-76 device card signalizes generation of an urgent or non-urgent alarm by sending
a signal to activate the alarm relays in TM-72. The urgent and non-urgent alarm signaling relay

E1/G.703 FIBER OPTIC MODEM
OPERATING MANUAL
IOA76-1F 9 May 2009
contacts in the telecommunication rack are connected to DB- 9 female socket. The detected
failure conditions and actions taken are shown in Table 1.
Table 4. Detected failure conditions and accompanying actions.
Actions taken
LED diode Re-
lay 1) E1 channel signal
G.742
frame
bit
Failed
Element
Failure
condition
Alarm
LOOS
LOF
10-3
10-6
LDF
RAL
LOES
UA
NUA
AIS
Loss of signal UA ; CO
AIS signals are
transmitted to all E1
interfaces
;
Loss of frame
synchronization UA
;
CO
AIS signals are
transmitted to all E1
interfaces
;
Error rate
> 10-3 UA
;
OC
AIS signals are
transmitted to all E1
interfaces
;
Error rate
> 10-6 NUA
;
C O ---
Transmitter
failure UA
;---
Linear optical
Interface
Remote alarm
;---
Local
interface
E1
G.703,
G.704
Loss of signal UA
;
CO
AIS signal is transmitted
via E1 channel to
multiplexer
Entire device Loss of power
supply UA
CC 
;– LED diode is on
1) – alarm relay, an activated alarm is indicated by closed relay contacts (C – closed contacts,
O – open contacts). TM-76.1 version is not equipped with alarm relays.
3.2 Additional channels
A frame is generated in the multiplexing system. The frame includes two bits, which are
used to generate two additional synchronous bi-directional data transmission channels
at the speed of 10 kbit/s each.
The first bit – Alarm Indication Signal Bit is used to transmit an alarm signal to a remote
device.

E1/G.703 FIBER OPTIC MODEM
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The other bit – National Bit is used for communication between the supervision systems
of a local and remote device.
3.3 Test loops
TM-76 and MD-76 device software enables closing a loop on E1 electric interface
and optical interface in the direction to and from the device. Concerning E1 interface, both loops
are closed at the same time. The figure below shows possible loops. A loop number is consistent
with the number used in the device software.
E1 por t
1
Opt i cal p or t
Figure 6. Loops
3.4 Clock transfer
TM-76 and MD-76 devices are based on a plesiochronous multiplexer compliant with
ITU-T G.742 standard. 2Mbit/s signals received on G.703 E1 electric interfaces are transmitted
separately. E2 linear optical interface collective signal clock is also separate from the clock
signals generated in E1 interface. The requirement is that the clock signal frequency restored on
E1 interface must be in accordance with ITU-T G.703 recommendation (2.048 MHz ±50ppm).

E1/G.703 FIBER OPTIC MODEM
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3.5 Event log
TM-76 and MD-76 devices can record the time and date of an event of a specified
criterion. The devices record the following types of events:
• an appearance or loss of power supply voltage,
• an appearance or loss of G.703 E1 interface input signal,
• an appearance or loss of AIS signal transmitted from a unit connected to E1 interface or
connected to E1 channel with E2 collective signal,
• an appearance or loss of E2 optical interface input signal,
• a gain or loss of G.742 frame synchronization on E2 optical interface,
• exceeding or going below 10-3 error rate threshold on E2 optical interface,
• exceeding or going below 10-6 error rate threshold on E2 optical interface,
• exceeding or going below a user-defined ES 15-minute errored second counter (ES15)
threshold – there is a separate counter for each interface,
• exceeding or going below a user-defined ES 24-hour errored second counter (ES24)
threshold – there is a separate counter for each interface,
• exceeding or going below a user-defined SES 15-minute severely errored second counter
(SES15) threshold – there is a separate counter for each interface,
• exceeding or going below a user-defined SES 24-hour severely errored second counter
(SES24) threshold – there is a separate counter for each interface,
• activation or deactivation of test loops,
• approval of a device set-up modification,
• an attempt of unauthorized access to the device set-up system using VT100 terminal
emulator, if the system is password-protected.
Reviewing and deleting the event log as well as defining maximum and minimum
threshold values for ES15,24 and SES15,24 counters of E1 and E2 interfaces is possible with
the Lanwin application or VT100 terminal emulator described in sections 5.5.4 Event log
and 6.6.1 Event log.

E1/G.703 FIBER OPTIC MODEM
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3.6 Monitored qualitative parameters of G.703 E1 interface
TM-76 and MD-76 devices are provided with a function of qualitative parameter monitoring.
The devices automatically monitor the interface signal parameters and detect, count and signalize
the following conditions and parameters:
Indicators:
• LOES - loss of electrical signal
• VIOL - HDB3 code violation on G.703 E1 optical interface
• AISL - AIS signal detection on G.703 E1 interface
• AISR - AIS signal detection in E1 flux demultiplexed from E2 collective
channel.
• ES15 - exceeding a 15-minute errored second counter threshold
• SES15 - exceeding a 15-minute severely errored second counter threshold
• ES24 - exceeding a 24-hour errored second counter threshold
• SES24 - exceeding a 24-hour severely errored second counter threshold
Counters:
• ES15 - 15-minute errored second counter
• SES15 - 15-minute severely errored second counter
• ES24 - 24-hour errored second counter
• SES24 - 24-hour severely errored second counter
• BBE15 - 15-minute background block error counter
• BBE24 - 24-hour background block error counter
• UAS15 - 15-minute unavailability second counter
• UAS24 - 24-hour unavailability second counter

E1/G.703 FIBER OPTIC MODEM
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3.7 Monitored qualitative parameters of E2 optical interface
TM-76 and MD-76 devices are provided with a function of qualitative parameter monitoring.
The devices automatically monitor the linear interface signal parameters and detect, count
and signalize the following conditions and parameters:
Indicators:
• LOOS - loss of optical signal
• LDF - laser diode failure
• LOF - loss of frame synchronization
• 10E-3 - error rate 10-3 exceeded
• 10E-6 - error rate 10-6 exceeded
• RAL - remote device alarm indicating a remote device connection failure
(between a local and remote device)
• ES15 - exceeding a 15-minute errored second counter threshold
• SES15 - exceeding a 15-minute severely errored second counter threshold
• ES24 - exceeding a 24-hour errored second counter threshold
• SES24 - exceeding a 24-hour severely errored second counter threshold
• SESFE15 - exceeding a 15-minute severely errored second far end counter
threshold
• SESFE24 - exceeding a 24-hour severely errored second far end counter threshold
Counters:
• ES15 - 15-minute errored second counter
• SES15 - 15-minute severely errored second counter
• ES24 - 24-hour errored second counter
• SES24 - 24-hour severely errored second counter
• SESFE15 - 15-minute severely errored second far end counter
• SESFE24 - 24-hour severely errored second far end counter
• BBE15 - 15-minute background block error counter
• BBE24 - 24-hour background block error counter
• UAS15 - 15-minute unavailability second counter
• UAS24 - 24-hour unavailability second counter

E1/G.703 FIBER OPTIC MODEM
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IOA76-1F 14 May 2009
4 INSTALLATION AND OPERATION
4.1 Operating conditions
The devices can operate continuously in closed rooms and in conditions according to
paragraph 7.4.1 of this Operating Manual. The devices should not be directly exposed
to sunlight. Ventilation slots must not be plugged. We do not recommend to put the devices on
heat sources, although they can be placed on another device of the same type or installed
in a rack together with other devices. However, such an arrangement requires a free air flow or,
if necessary, forced ventilation.
4.2 Installation
TM-76 is a desktop device; MD-76 is installed in MD-72 telecommunication rack.
MD-76 device comprises a digital card and an interface card. The digital card is installed
in the front part of the rack in slots 1÷16 and the interface card is installed in their corresponding
slots in the rear part of the rack. The cards are equipped with pullers for easy assembly
and disassembly in TM-72 rack. The cards can be installed in the rack without a need to turn off
the power supply. There is no specific sequence of assembly of the digital card and interface
card.
The figures below show the rack with the installed MD-76 card (slot 2), MD-77 card (slot 1)
and MD-91 management module card (slot 17) enabling communication with the Lanwin
management application.
The management module card can be installed in slot 17 only.
Figure 7. Installation of the devices in the form of a card in MD-72 telecommunication rack,
front view.