IOA81-1E
August 2004
LANEX S.A., 8 Ceramiczna St., 20-150 Lublin, POLAND Service Dept.: tel. (81) 443 96 39
MULTIPLEXER
Type
TM-81.1
5
X RS-232, 485 + 2 X ETHERNET
2 M
BIT/S G.703 (G.704)
OPERATING MANUAL
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E I August 2004
Table of Contents
1 GENERAL CHARACTERISTICS............................................................................................................ 2
1.1 PURPOSE ............................................................................................................................................... 2
1.2 BASIC FEATURES OF THE UNIT .............................................................................................................. 2
1.3 EXAMPLES OF APPLICATION ................................................................................................................. 2
1.4 MARKING..............................................................................................................................................2
2 CONNECTORS AND LED INDICATORS..............................................................................................2
2.1 FRONT PANEL ....................................................................................................................................... 2
2.2 REAR PANEL.......................................................................................................................................... 2
2.3 CONNECTORS' DATA ............................................................................................................................. 2
2.4 PRINCIPLES OF CONNECTING................................................................................................................. 2
E1 Interface.................................................................................................................................................... 2
Ethernet Interface .......................................................................................................................................... 2
RS-232/485 Interface ..................................................................................................................................... 2
3 FUNCTIONAL DESCRIPTION................................................................................................................2
3.1 INTRODUCTION ..................................................................................................................................... 2
3.2 BLOCK DIAGRAM .................................................................................................................................. 2
3.3 STRUCTURE OF 2048 KBIT/S SIGNAL FRAME ........................................................................................2
3.4 PRINCIPLES OF DROPPING THE SLOTS FROM 2048 KBIT/S SIGNAL.......................................................... 2
3.5 SELECTION OF OF TIME SLOTS ............................................................................................................... 2
3.6 SELECTION AND CONFIGURATION OF TRIBUTARY CHANNELS .............................................................. 2
3.7 OPERATING MODES OF TRIBUTARY CHANNELS ....................................................................................2
Operating mode with interrupted transmission path ..................................................................................... 2
Operating mode without interrupting the transission path............................................................................2
3.8 EMERGENCY MODE............................................................................................................................... 2
3.9 OPERATION WITH THE TM-48 DEVICE .................................................................................................. 2
3.10 OPERATION AS A TERMINAL EQUIPMENT .............................................................................................. 2
3.11 ESTABLISHING THE CLOCK SOURCE...................................................................................................... 2
............................................................................................................................................................................ 2
4 INSTALLATION AND OPERATION ......................................................................................................2
4.1 INTRODUCTION ..................................................................................................................................... 2
4.2 OPERATING CONDITIONS ...................................................................................................................... 2
4.3 INSTALLATION ...................................................................................................................................... 2
4.4 SELECTION OF INPUT AND OUTPUT IMPEDANCE OF LINE PORTS ...........................................................2
4.5 CONFIGURING THE CONTACT POINTS OF RS-232/485 CHANNEL PORTS ............................................... 2
4.6 POWER SUPPLY .....................................................................................................................................2
Mains .............................................................................................................................................................2
Power pack ....................................................................................................................................................2
5 CONFIGURATION..................................................................................................................................... 2
5.1 CONFIGURATION OF TRIBUTARY CHANNELS.........................................................................................2
5.2 SELECTION OF DIRECTION IN TRIBUTARY CHANNELS ...........................................................................2
5.3 SELECTION OF TIME SLOTS ................................................................................................................... 2
5.4 SELECTION OF OPERATING MODES FOR CHANNELS ..............................................................................2
5.5 SELECTON OF OPERATING MODE FOR THE DEVICE ...............................................................................2
6 DIAGNOSTIC LOOPS ............................................................................................................................... 2
6.1 TRIBUTARY LOOP ON THE PORT "A" ..................................................................................................... 2
6.2 TRIBUTARY LOOP ON THE PORT "B" .....................................................................................................2
6.3 TRIBUTARY LOOP ON "A" AND "B" PORTS ........................................................................................... 2
7 DISTRIBUTION FRAME ..........................................................................................................................2
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E II August 2004
8 SPECIFICATIONS......................................................................................................................................2
8.1 ELECTRICAL PARAMETERS ....................................................................................................................2
2048 kbit/s Line Interface...............................................................................................................................2
RS-232(V.28) Asynchronous Digital Interface...............................................................................................2
RS-485(EIA-485) Asynchronous Digital Inteface .......................................................................................... 2
Ethernet 10BASE-T Digital Interface.............................................................................................................2
8.2 MECHANICAL PARAMETERS ..................................................................................................................2
8.3 ELECTROMAGNETIC COMPATIBILITY ....................................................................................................2
8.4 ENVIRONMENTAL REQUIREMENTS........................................................................................................2
Operation ....................................................................................................................................................... 2
Transportation ...............................................................................................................................................2
Storage ...........................................................................................................................................................2
8.5 POWER SUPPLY .....................................................................................................................................2
9 SCOPE OF DELIVERY.............................................................................................................................. 2
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E III August 2004
List of Abbreviations
AIS Alarm Indication Signal
ETSI European Telecommunications Standards Institute
GND Neutral (Ground)
ITU-T International Telecommunication Union – Telecommunication Standardization Sector
LOS Loss Of Signal
LOF Loss Of Frame
DCE Data Communication Equipment
DTE Data Terminal Equipment
SDH Synchronous Digital Hierarchy
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E IV August 2004
Operational safety
The TM-81.1 multiplexer has been designed and tested for the operating safety in
accordance with PN-EN 60950 standard.
! This Operating Manual is an integral part of the device and it is delivered to the Us-
ers along with it.
! Only authorised persons with qualifications confirmed by the appropriate certificate
can configure the device.
! The power supply cable should always be connected to power source by means of a
socket with neutral pin. Connection to the power network without neutral pin is allowed, provided the earthing terminal located on the rear panel of the device is connected to ground.
! Simultaneous grounding and neutral earthing through power cord is not allowed.
! Dual fuse - phase/neutral. Each phase wire is protected with separate fuse installed
inside the device. If only one fuse is defective, other components can be live.
! Some of power pack components installed on PCB are connected with mains potential.
! In order to avoid any contact with live components, always disconnect power supply
before removing the cover.
! The device is not equipped with a built-in circuit-breaking system. Such a system
should be installed outside the device.
The Manufacturer is not responsible for any use of the device in a manner noncompliant with the operating manual.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 1 August 2004
1 General characteristics
1.1 Purpose
The device allows transmitting both asynchronous digital signals and Ethernet signals
through 64 kbit/s transmission channels of 2048 kbit/s stream structured in compliance with
ITU-T G.704 Recommendation.
The multiplexer is equipped with two 2048 kbit/s line ports that are compliant with ITUT G.703 recommendation in the physical layer. These ports enable connection with other telecommunication devices like SDH or PCM-30 terminal equipment or any other signal sources
featuring the bitrate of 2048 kbit/s and equipped with corresponding interfaces.
The multiplexer enables adding the component 64 kbit/s signals to and dropping them
from a line stream of 2048 kbit/s, both in point-to-point or bus configuration.
1.2 Basic Features of the Unit
The unit is equipped with two line ports 2048 kbit/s compliant with ITU-T G.703 and
G.704 Recommendations.
Moreover, the multiplexer has five tributary ports compliant with ITU-T V.28 and V.11
standard, as well as two ports compliant with IEEE802.3 10BASE-T standard.
The device is available in two versions: powered from the 24 ÷ 50 V DC battery pack and
with power supply from 110÷230 V mains.
The multiplexer housing is 434 mm wide, 188 mm deep and 44 mm high. The front panel
of the device is equipped with the set of switches for device configuration and eleven LED
diodes that signal the device status.
It is possible to screw mounting brackets to the housing. These brackets are necessary for
mounting the device in a 19’’ or 21’’ telecommunication rack.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 2 August 2004
1.3 Examples of Application
G.703/G.704
G.703/G.704
C1 (RS232/485)
C6 (10BASE-T)
Radio line modem
Radio tower
TM-81
G.703/G.704
C6(10BASE-T)
TM-81
G.703/G.704
G.703/G.704
LAN
C7 (10BASE-T)
G.703/G.704
LAN
Managing station
C1-5 (RS232/485)
Telecommunication
network
TM-81
C2
(RS232/485)
Alarm
switchboard
C5
(RS232/485)
Alarm
switchboard
. . .
LAN
C7 (10BASE-T)
Fig. 1. Application of TM-81-1 multiplexer for construction of data transmission
and management networks.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 3 August 2004
G.703/G.704
G.703/G.704
C6
(10BASE-T)
TM-81
G.703/G.704
TM-81
TM-81
G.703/G.704
G.703/G.704
C7
(10BASE-T)
G.703/G.704
Monitoring station
C1-5 (RS232/485)
Telecommunication
network
C3-5
(RS232/485)
Alarm
switchboards
C3-5
(RS232/485)
C1
(RS232)
C2
(RS232)
IP camera IP camera
C6
(10BASE-T)
C7
(10BASE-T)
C1
(RS232)
C2
(RS232)
IP camera IP camera
C7
(10BASE-T)
C7
(10BASE-T)
Alarm
switchboards
Fig. 2. Application of TM-81.1 multiplexers for construction of object protection
networks
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 4 August 2004
1.4 Marking
Note: Each time a symbol containing the letter "X" instead of its corresponding digit appears
in the Manual, it means that the feature specified in this part of the symbol is insignificant for the parameter being discussed and may be equal to any value from the abovementioned range. However, the device symbol specified for ordering purposes must
contain only the digits following the manufacturer symbol "TM".
2 Connectors and LED indicators
2.1 Front Panel
The following controls are located on the front panel of the device:
• Switches for configuring the device,
• LEDs for signalling the status of G.703 and 10BASE-T channels,
• LED for signalling the power on.
1 - Power On LED
2 - Switches for configuration of RS component channels
3 - Switches for configuration of ETHERNET component channels,
Status signalling for Ethernet channels (RCV- reception of frames at the port, LNK – informs whether
the port is connected correctly)
4 - Switches for configuration of E1 2048 kbit/s channels
5 - Status signalling for E1 ports
TM-81
MULTIPLEXER 7x64k/2M
T R I B U T A R Y C H A N N E L C O N F I G U R A T I O N
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
B
A
Droop
LNK
RCV
LNK
RCV
C CCCC C CLPCCC
TS
C
1 1134 5 7 7 762
CHANNEL DIRECTION
10BASE-T
MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
RS232/485
Continue
Droop &
1 2 3 4 5
Fig. 3. Front panel
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 5 August 2004
2.2 Rear panel
The following controls are located on the rear panel of the device:
• E1 interface connectors,
• Alarm contact connector,
• Connectors of RS-232, 485, and Ethernet 10BASE-T tributary channels,
• LEDs for signalling the status of 10BASE-T interfaces (LNK,RCV),
• Screw terminal for connecting the 48 V DC power supply,
• Grounding terminal.
POWER
LNK LNK
RCV RCV
10BASE-T 10BASE-T
2x10BASE-T5xRS232/485
MDI-XDCE
C
24
CCC
CC
135
67
BA
75W
120W
Alarm
7,8 SHIELD
51
9
6
1 2 3 4 5 6
1 -
Connectors of E1 interfaces – balanced 120 Ω DB-9, coaxial 75 Ω 1,6/5,6 mm
2 - Screw terminal for alarm contact
3 - Connectors of RS-232, 485 tributary chatnnels:
C1 – first tributary channel, etc.
4 - Connectors of Ethernet – RJ-45 tributary channels
Status signalling for Ethernet channels (RCV- reception of frames at the port, LNK – informs whether the
port is connected correctly)
5 - Screw terminal for power supply
6 - Grounding terminal
Fig. 4. Rear panel
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 6 August 2004
2.3 Connectors’ data
Pin No. Pin Description
1,6 Transmission of Data – output
5,9 Reception of Data – input
7 Transmitted data – shield
1
6
5
9
8
7
8 Received data – shield
Fig. 5. View and description of balanced E1/G.703 120 Ω contact connector
Pin No. Pin Description
1 DCD
2 RD (Transmitted Data)
3 TD (Received Data)
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
1
6
5
9
9 Not connected
Fig. 6. View and description of asynchronous RS-232 DCE interface connector
Pin No. Pin Description
1 Not connected
2 TD+ (Transmitted data)
3 RD+ (Received data)
4 Not connected
5 Not connected
6 TD- (Transmitted data)
7 Not connected
8 RD- (Received data)
1
6
5
9
9 Not connected
Fig. 7. View and description of asynchronous RS-485 interface connector
Pin No. Pin Description
1 TD+( Received data)
2 TD- (Received data)
3 RD+(Transmitted data)
18
6 RD- (Transmitted data)
Fig. 8. View and description of Ethernet - MDI-X interface connector
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 7 August 2004
2.4 Principles of Connecting
E1 Interface
Input and output signals of the E1/G.703 interface can be fed in two ways:
• By using two coaxial cables with the impedance of 75 Ω, terminated with 1,6/5,6 plug-in
connectors, or
• By using two screened balanced cables with the impedance of 120 Ω, or one screened
double cable with the same impedance.
Please remember to set jumpers inside the device in accordance with the type of cable
used – see point 4.4.
To meet the requirements concerning generation of radioelectric interference, the follow-
ing principles should be observed:
• The 1,6/5,6 plug-in connector should be installed on the coaxial cable in the way ensuring
the good electric contact of the cable screen with the housing of connector around the
whole periphery,
• Connection of balanced cables should be made by using the DB-9 plug-in connector
equipped with metallic or metallised housing (casing), and the screen of cable/cables
should contact the housing around the whole periphery.
Description of pins in the E1/G.703 120 Ω interface socket is given in the point 2.3.
The Ethernet Interface
Pin1
Pin8
1 White/orange
2 Orange
3 White/green
4 White/blue
5 Blue
6 Green
7 White/brown
8 Brown
1 White/green
2 Green
3 White/orange
4 White/blue
5 Blue
6 Orange
7 White/brown
8 Brown
Fig. 9. View of the cable for connecting the Ethernet port of the TM-81.1 multiplexer
with the MDI-X port of the connected device.
Pin1
Pin8
1 White/orange
2 Orange
3 White/green
4 White/blue
5 Blue
6 Green
7 White/brown
8 Brown
1 White/orange
2 Orange
3 White/green
4 White/blue
5 Blue
6 Green
7 White/brown
8 Brown
Fig. 10. View of the cable for connecting the Ethernet port of the TM-81.1 multiplexer
with the MDI port of the connected device.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 8 August 2004
The TM-81.1 device is equipped with two Ethernet 10BASE-T MDI-X tributary ports
outputted to RJ-45 connectors.
The cables connecting the TM-81.1 multiplexer with other devices are shown on Fig. 9
and 10. When connecting with the MDI-X port of other device (like hub or switch) the pairs
of transmitter and receiver should be crossed (Fig, No. 9). For connecting with the MDI port
(network card, router) pairs of transmitter and receiver should be connected directly (Fig. No.
10).
Connection should be made by twisted cable, category 5 at least, with the characteristic
impedance of 100 Ω.
The RS-232/485 Interface
The device is equipped with five asynchronous DCE ports outputted to DB-9 connectors
located at rear panel. Each port may be configured for connection with the RS-232 or RS-485
interface. Type of connected interface is selectable by using switches that are individually
dedicated to each port and located on the front panel.
Scheme of connecting the RS-232 interface cable depends on pin arrangement and type
of mating connector. Correct operation is ensured on condition that suitable circuits are connected and the transmitter → receiver principle is observed during connecting the port with
another interface.
When configuring the interface to RS-485, a number of operations, resulting from the interface properties, should be performed in order to ensure proper operation of the interface.
When switching to another type of interface, the type of transmitters and receivers change
from unbalanced RS-232 to balanced RS-485 ones. Therefore the RS-485 interface should be
connected by using twisted cable with the characteristic impedance of pairs equal to 120 Ω.
Also, the principle of connecting +/- circuits with the same symbol (e.g. TD+/-) over one pair
should be observed.
As a standard, a RS-485 line uses a shielded balanced twisted cable for transmitting the
signals. Up to 32 receivers/transmitters can be connected to balanced twisted bus. There are
no special recommendations concerning the point where the device is connected to the bus
and connecting the device at the end is not necessary, however the resistors with impedance
equal to characteristic impedance of cable should be connected to at both ends of the bus.
Due to specific nature of RS-485 topology, transmitters are required to set into high impedance state after completion of transmission or during no-transmission period. This state is
seen by receiver as silence on the line. Most line receivers set into logical 1 when their inputs
are open. In case of no transmission all transmitters are set to high impedance and their inputs
are short-circuited by 120 Ω resistors. From the receiver point of view such state is undefined
and, despite the use of hysteresis in receivers, occurrence of interferences on the line may
cause switching of the receiver. In order to prevent this phenomenon, the line during notransmission is enforcedly set to appropriate state by adequate biasing of receiver’s inputs.
Each port of the TM-81.1 multiplexer is equipped with a set of resistors allowing terminating the bus. These resistors are connectable by using a set of jumpers described in point 4.5.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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Attaching the terminating resistor simultaneously induces line bias as shown below.
Fig. 11. TM-81.1 multiplexer - connecting of terminating resistor and biasing the line.
Each port of the TM-81.1 multiplexer, once configured for RS-485, can work in two
modes of transmission, i.e. half-duplex or duplex mode. Setting the operating mode up is
possible by using a set of configuration switches located on the front panel of the device.
When the device is to work in half-duplex mode and transmit through one twisted
pair, it is necessary to short the circuits RD+ → TD+ and RD- → TD- on the cable attached to the multiplexer.
RD+RD-
Ground
Vcc
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 10 August 2004
3 Functional Description
3.1 Introduction
The multiplexer is equipped with two 2048 kbit/s line ports (A and B) compliant with
ITU-T G.703 and G.704 recommendations. Through these ports the device can be connected
with other telecommunication devices like SDH multiplexers, PCM-30 multiplexers or with
any other signal sources featuring with the bitrate of 2048 kbit/s and equipped with similar
interfaces.
Next, the multiplexer is equipped with five full-duplex channel ports C1÷C5 compliant
with the ITU-T V.28 or EIA-485 standard and two duplex channel ports C6÷C7 compliant
with IEE802.3 10BASE-T standard in the physical layer, allowing connecting the device with
telecommunication equipment with identical interfaces. These ports are also called „tributary
channels”.
The fundamental function of multiplexer is to transmit signals appearing in C1÷C7 tributary channels through 64 kbit/s time slots of 2048 kbit/s stream introduced by one of line
ports. A data signal delivered to channel ports is directed to physical input transceivers, regenerated and then delivered to asynchronous/synchronous controllers.
The access of tributary channels to the 2048 kbit/s stream is possible thanks to the integral, configurable dropping circuit (see Fig. 12).
The dropping circuit can be configured by using a set of switches located at the front
panel. When configuring this circuit, it is possible to:
- Select tributary channels designated for transmission;
- Select the group of time slots within the 2048 kbit/s stream and assign this group to
tributary channels;
- Establish the line port (A or B) from which time slots will be dropped;
- Set operating mode for each tributary channel.
Detailed description of the configuration function and methods of dropping are given in next
sections of this manual.
C1 C2 C3 C4 C5 C6 C7
PORT
B
PORT
A
5 x RS-232/485
2 x 10BASE-T
TM-81
MULTIPLEXER 7x64k/2M
TRIBUTARY CHANNEL CONFIGURATION
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
LNK
BOR
AMUX
RCV
C CCCC C C C CCC
1 1134 5 7 7 762
CHANNEL DIRECT ION MODE OF OPERATION
45678123ON45678123
ON
4123ON45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
LNK
RCV
Fig. 12. Multiplexer type TM-81: transmission ports
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 11 August 2004
3.2 Block Diagram
Relays
shunting the
device at
power failure
2048kbit/s
G.703
Circuit for dropping/inserting
time slots into/from signal
frame 2048kbit/s
Nadajnik/
odbiornik
RS-232
Transmitter/
Receiver
RS-232 RS-232 RS-232 RS-232 RS-232
Nadajnik/
odbiornik
RS-232
Nadajnik/
odbiornik
RS-232
Nadajnik/
odbiornik
RS-232
Nadajnik/
odbiornik
RS-232
Signal
transmitter
and receiver
2048kbit/s
G.703
LED signalling
diode
Alarm
relay
Signal
transmitter
and receiver
2048kbit/s
G.703
Micro-controller
Configuration
switches
Local(tributary) channel
Directio n of channel
Channel operation mode
CONFIGURATION
Relays
shunting the
device at
power failure
Line port B
G.703 2048kbit/s
Line port A
G.703 2048kbit/s
Signal framing
synchronisation
circuit
2048kbit/s
G.703
Alarm
contact
Dwukierunkowe porty
kanałowe RS232(V.28)
C1-C10
Ethernet
PHY
&
Bridge
Ethernet
PHY
&
Bridge
Transmitter/
Receiver
Transmitter/
Receiver
Transmitter/
Receiver
Transmitter/
Receiver
Signal framing
synchronisation
circuit
Fig. 13. Block diagram
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 12 August 2004
3.3 Structure of 2048 kbit/s signal frame
The frame of 2048 kbit/s signal, compliant with the ITU-T G.704 Recommendation, is
composed of 256 bits numbered from 1 to 256 and is repeated with the frequency of 8 kHz.
Successive bits: 1÷8, 9÷16, 17÷24, ..., and 249÷256 form 32 channels, 64 kbit/s each. These
channels are located in 32 time slots numbered from 0 to 31.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Fig. 14. Frame of the 2048 kbit/s signal
For transmission of digital signals only time slots 1 - 15 and 17 – 31 are used.
The slot 0 is used for transporting the frame synchronization pattern, service bits and
CRC-4 cyclic code remainder bits (if the generation option is set). The sixteenth slot dedicated to signalling is not used.
The device allows setting the option of generation of CRC-4 code and multiframe synchronisation signal. The device is factory configured in such a way that the remainder of
CRC-4 code and the pattern of multiframe synchronisation are not added to outgoing frame.
To enable the function of adding the remainder of CRC-4 code, it is necessary to short JP16
contacts on position 17 (Fig. 15), whereas adding the multiframe synchronisation pattern is
forced by shorting JP16 contacts on position 3. To activate these settings it is necessary to
restart the device or initialise it by momentary shorting the RESET contacts.
PMC
PMC
ALTERA
ATM EL
17 3 4 5
RESET
J16
P
Fig. 15. Jumpers for enabling generation of CRC-4 cyclic code and multiframe
synchronisation signal
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OPERATING MANUAL
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3.4 Principles of dropping the slots from 2048 kbit/s signal
Principles of dropping the slots from the 2048 kbit/s signal result from the frame structure. During dropping process the slots TS0 and TS16 are omitted. Assuming that the TS(x)
slot is the first timeslot designated for transmitting signals of n tributary channels, where
x∈(1÷15, 17÷31), n∈(1÷7), and:
- if x≤15 and x+(n–1)≤15, then slots from TS(x) up to TS(x+n-1) will be dropped (Fig. 16a),
- if x≥17 and x+(n-1) ≤31, then slots from TS(x) up to TS(x+n-1) will be dropped (Fig. 16b),
- if x≤15 and x+(n-1)≥16, then slots from TS(x) up to TS15 and from TS17 up to TS(x+n) will
be dropped (Fig. 16c), and
- if x+(n-1)>31, then slots from TS(x) up to TS31 and from TS1 up to TS(x+n-32) will be
dropped (Fig. 16d).
a)
0
• • • • • • •
16
↑ ↑
TS(x) TS(x+n-1)
b)
0 16
• • • • • • •
↑ ↑
TS(x) TS(x+n-1)
c)
0
• • • •
16
• • •
↑
↑
TS(x) TS(x+n)
d)
0
• • •
16
• • • •
↑ ↑
TS(x+n-32) TS(x)
Fig. 16. Dropping of 64 kbit/s slots from 2048 kbit/s signal frame
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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3.5 Selection of time slots
Assignment of time slots TS of the 2048 kbit/s stream to tributary channels is made by
using „CONFIGURATION” switches. Assignment is effected by selecting the number of first
slot from the group of slots intended for transmission.
The selected group of slots is associated with the C1÷C7 tributary channels in such a way
that first tributary channel C1 is assigned to the first slot of the 2048 kbit/s stream, and next
tributary channels C2 – C7 are assigned to next successive slots.
When selecting timeslot it is important to remember that:
• neither TS0 nor TS16 slots can be selected as a first slot,
• the TS0 and TS16 slots are not assignable, in compliance with principles described in
point 3.4.
In examples shown below the slot number 2 is selected, i.e. the group of slots 2÷9 is de-
signed for transmission.
Selected timeslots are associated with tributary channels, but these channels do not occupy
them. Slots are occupied when specified tributary channels are switched on by switches that
configure the working parameters of tributary channels.
3.6 Selection and configuration of tributary channels
Switching on and configuring of C1÷C7 channels, i.e. occupying the selected timeslots, is
possible by using the „TRIBUTARY CHANNEL CONFIGURATION” switches, whereas the
„CHANNEL DIRECTION” switches allow setting, for every channel, from which line port
(A or B) the time slots will be dropped.
Switches on front panel
Initial slot selected by using
CONFIGURATION switches
Input of line
port B
Output of line
port A
Output of
line port B
Input of line
port A
CHANNEL DIRECTION
TRIBUTARY CHANNEL
CONFIGURATION
Selected group of timeslots
. . .
. . .
. . .
. . .
. . .
Selected group of timeslots
A
B
C1-5
C6-7
Fig. 17. Dropping of 64 kbit/s slots from the 2048 kbit/s signal frame
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OPERATING MANUAL
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3.7 Operating modes of tributary channels
Transmission between line ports A and B and tributary channels C1÷C7 can be effected
in one of two ways:
• With interrupted transmission path - DROP mode,
• Without interrupting the transmission path - DROP & CONTINUE mode.
Selection of operating mode is made for each of seven tributary channels individually by
using „MODE OF OPERATION” switches.
Operating mode with interrupted transmission path -Drop mode
If the tributary channel equivalent to the nth time slot is selected and the „MODE OF
OPERATION” switch is set to the DROP position, then the transmission path between A and
B ports for this slot is interrupted in both directions. Connection between selected tributary
channel and A or B port through this slot is closed, and the “0” signal is sent in outgoing direction of the opposite port.
In the example shown on Fig. 18 the C1 tributary channel is selected. This channel is associated with time slot number 2. Transmission path between ports A and B for the slot 2 is
interrupted in both directions. Connection between selected C1 channel and the port A through
this slot is closed. In the interrupted slot the “0” signal is sent in outgoing direction of the port
B.
DMUX
MUX
Output of line
port A
Input of line
port B
Input of line
port A
Output of line
port B
Initial slot selected by using
CONFIGURATION switches
CHANNEL DIRECTION
TRIBUTARY CHANNEL
CONFIGURATION
A
B
C1
MODE OF OPERATION
Drop
Drop&
c
Fig. 18. Dropping of time slots with interrupted transmission path
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Operating mode without interrupting the transmission path (Drop & Continue mode)
If the tributary channel equivalent to the nth time slot is selected and the CHANNEL
MODE OF OPERATION switch is set to the OR position, then the transmission path between
A and B ports for this slot is continuous.
In the example shown on Fig. 19 the C1 tributary channel is selected. This channel is associated with time slot number 2. Connection between ports A and B for the slot 2 is continuous. Also, the connection between selected C1 channel and the port A through this slot is
closed.
Initial slot selected by using
CONFIGURATION switches
Output of line
port A
Input of line
port B
Input of line
port A
Output of line
port B
CHANNEL DIRECTION
TRIBUTARY CHANNEL
CONFIGURATION
A
B
C1
MODE OF OPERATION
Drop
Drop&c
o
Fig. 19. Dropping the slots without interrupting the transmission path
3.8 Emergency mode
At power failure the device connects the 2048 kbit/s transmission track between port A
and B in order to preserve discontinuity. Input of the A port is connected with the output of
port B, and the input of port B is connected to the output of port A.
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3.9 Operation with the TM-48 device
The TM-81 multiplexer can operate with the TM-48 device, when transmission of data is
effected through tributary RS-232 ports. Asynchronous RS-232 ports in the TM-81 device can
be switched to operation with the TM-48 device. After such switching the principle of inserting of asynchronous data stream appearing on the RS-232 port into the 64 kbit/s slot of the
G.704 stream changes and becomes same as in the TM-48 device. Changing the operating
mode of RS-232 ports require reconfiguration of the multiplexer in the way described in point
5.1.
Switching over into the operating mode with the TM-48 device causes that RS-232
channels work at the speed of 50 – 9600 bit/s. In this mode neither configuration of the speed
nor setting the start-stop frame format is necessary. When the device works as compatible
with the TM-48 device, the co-operation with the RS-232 interface only is possible. The RS485 interface can’t be used.
Regardless the operating mode configured on the RS-232 ports, the way in which the
devices on 2048 Mbit/s line ports are connected remains unchanged. Both point-to-point and
bus configuration are permitted. Also, the principles of configuring the clock in such connections remain the same as for connections effected by using the TM-81 devices only.
3.10 Operation as a terminal equipment
If there is no 2048 kBit/s signal connected to one of line ports (A or B), the multiplexer
should work as a terminal device. Then the device works with the own 2048 kbit/s clock or
with the clock reproduced from the G.703 interface and generates the frame compliant with
the ITU-T G.704 recommendation towards the used port.
The TM-81.1 device is able to automatically switch itself into the terminal device operating mode, or may be toggled into this mode by using a switch.
If the device is not configured as the terminal device, then it switches automatically into
the terminal device operating mode when the loss of 2048 kbit/s signal is detected or when it
receives an AIS signal (111111... sequence). At the same time, the alarm bit in the TS0 slot
not containing synchronization pattern towards the used port is set. When the signal appears
again or AIS signal diminishes, the device resumes operation with two ports.
If the multiplexer is configured as a terminal device by using a switch, then in the case of
loss of 2048 kbit/s signal or detection of the AIS signal from the direction of unused port the
alarm bit in TS0 slot is not set.
The multiplexer can be set as the terminal device by using CONFIGURATION switches
(see point 5.5 – Selection of operating mode).
3.11 Establishing the clock source
Selection of clock source is possible only when the multiplexer is set to operation as a
terminal device by using a switch.
Automatic setting into terminal device operating mode always causes the use of clock
from internal generator.
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In the examples shown on Fig. 20, the multiplexers TM-81.1 (A) and TM-81.1 (D) are
configured as terminal devices. If the multiplexer A will operate with the internal clock and
the multiplexer D with the clock reproduced from the G.703 interface, then transmission in
both directions is fully synchronous. A and D multiplexers may also operate independently
with their own internal clocks. However operation of both multiplexers, configured as terminal devices, with reproduced clocks is not possible.
The clock source is selectable by using CONFIGURATION switches (see point 5.5 – Se-
lection of operating mode).
T
M
-
8
1
(
A
)
TM-81(B) TM-81(C)
T
M
-
8
1
(
D
)
G
C
D
R
Clock path in the A-D direction
Clock path in the D-A direction
Fig. 20. Configuration of the clock for the chain of TM-81.1 multiplexers
4 Installation and Operation
4.1 Introduction
Prior to putting the multiplexer into normal service, it is necessary to install it and set-up
properly, in accordance with recommendations given below.
4.2 Operating conditions
The TM-81.1 multiplexer can operate continuously in closed rooms in environmental
conditions presented in the „Specifications” chapter. The device should not be exposed to
direct sunlight. Ventilation slots in the multiplexer housing must not be clogged. It is not recommended to stand the device on heat-emitting objects, although it can be placed on other
identical device or installed in the rack in which other devices work. In this case an unrestricted flow of air should be ensured or, if necessary, forced ventilation system installed.
4.3 Installation
The TM-81.1 multiplexer can operate as a standalone device or be mounted in 19 or 21
inches rack. For installation in the rack, special mounting brackets included in delivery should
be screwed to side walls of the device.
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Fig. 21. Installation of the multiplexer in 19’’ or 21’’ rack
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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4.4 Selection of input and output impedance of line ports
To adjust the multiplexer to operation with balanced cables (impedance of 120 Ω) or coaxial cables (impedance of 75 Ω), the JP1, JP2-4 , JP5-7, JP8-11, JP12-15, and JP16 jumpers
(positions 4 and 5) should be set as shown in the table on Fig. 22.
Jumpers are accessible after removing the cover. To get the access to jumpers one should
undo four screws from the top of housing, then undo four side screws and remove upper
cover.
The value of characteristic impedance can be set up for each port individually. The multiplexer is factory set for operation with balanced cables with the impedance of 120Ω.
JP1
]120[
] 75 [
1
2
3
JP8-11
1
2
3
JP2-4
] 75 [
]120[
3
2
1
JP5-7
3
2
1
3
2
1
JP12-15
JP5-7
JP1
JP12-15
JP 16(p.4)
1-2 2-3
1-2 2-3
1-2 2-3
120 75
ΩΩ
(factory setting)
PMC
PMC
ALTERA
ATM EL
17 3 4 5
RESET
J16
P
Shorted Open
PORT A
JP2-4
JP1
JP8-11
JP 16(p.5)
1-2 2-3
1-2 2-3
1-2 2-3
120 75
ΩΩ
(factory set ting)
Shorted Open
PORT B
Fig. 22. Location of jumpers on the multiplexer’s board carrying line interfaces
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
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4.5 Configuring the contact points of RS-232/485 channel ports
To configure contact points of channel ports it is necessary to set jumpers on the board
with channel interfaces in appropriate positions (see Fig. 23).
For each channel ports, C1÷C5, it is individually possible to:
• Set the DSR line into ON or OFF state, or connect it with the DTR line;
• Set the CTS line into ON or OFF state, or connect it with the RTS line;
• Set the DCD line into ON or OFF state.
Jumpers are accessible after removing the cover. To get the access to jumpers one should
undo four screws from the top of housing, then undo four side screws and remove upper
cover.
Factory settings are as follows: DTR line is connected with DSR line (DTR ↔ DSR),
RTS line is connected with CTS line (RTS ↔ CTS), and DCD line is set to OFF.
C2
C1C4
C3
C5
C2
C1C4
C3
C5
Fig. 23. Location of jumpers on the board with channel interfaces
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Figure No. 23 illustrates the position of jumpers for setting the zero modem in the RS-232
interface configuration.
Note: It is very important to set RS-485 terminating jumpers to OFF when setting
the device to RS-232 interface. Wrong positions of RS-485 bus biasing jumpers may
cause improper operation of the RS-232 interface.
Figure 24 shows positions of RS-485 interface terminating jumpers set to OFF. Setting the
termination and bias jumpers to ON is justified only when the type of interface is configured
to RS-485.
Note: In case the interface type is set to RS-485, the DTR ↔ DSR, RTS ↔ CTS, and
DCD jumpers should be removed, otherwise the RS-485 interface may work incorrectly.
TERM TERM
TERM
Locations of terminating and bias jumpers
of the RS-485 jumpers OFF state
Fig. 24. Location of jumpers related with termination and bias of the RS-485 bus
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4.6 Power supply
Mains
The multiplexer in TM-81-1-1 version can be powered with both DC and AC voltage; the
latter with the frequency of 50 - 60 Hz and rated value of 110 - 230 V. Changing the power
supply mains voltage from 230 V to 110 V and vice versa does not require any modifications
of device settings.
The mains socket the multiplexer is connected to should be equipped with neutral
(zero) pin. Connection to the power network without neutral wire is permitted, provided the
grounding terminal located on rear panel is connected to ground.
Simultaneous grounding through grounding terminal and neutral earthing through
power cord is not allowed.
Connecting the multiplexer to this power loop from which equipment capable to emit
significant pulse interferences, like commutator motors, discharge lamps etc. should be
avoided. To ensure maximum reliability, use of the UPS power supply unit is much recommended.
Note: Double fuse - phase/neutral. Every mains power cord is protected by separate fuse
installed inside the multiplexer.
Some elements of power supply unit, located at the PCB, may be live.
For versions with 110÷230 V mains power supply (TM-81-1-1) the plug on power
cord also plays a role of circuit-breaking element. Therefore the mains socket should be
installed possibly close to the device and should be easily accessible to the personnel.
Battery pack
Multiplexer in the TM-81-1-2 version is supplied with DC voltage with rated value
within the range of 24÷50 V.
Supply voltage should be fed to the socket with external screw connectors. Polarity of supply
voltage is not significant and can be chosen arbitrarily. Grounding terminal located on the
device housing should be connected to ground. Grounding wire should feature with low impedance at high frequencies.
The device designed for supplying from 24÷50 V DC source (TM-81-1-2) is not
equipped with built-in circuit breaker, therefore it is recommended to install an easily
accessible circuit-breaking device in fixed cabling.
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Power supply connector
Grouding terminal
Or
Power supply connector
Grouding terminal
Or
Fig. 25. Examples of battery pack connections.
5 Configuration
For configuring the multiplexer, a set of switches is provided on the front panel.
5.1 Configuration of tributary channels
MULTIPLEXER 7x64k/2M
TRIBUTARY CHANNEL CONFIGURATION
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
LNK
BOR
AMUX
RCV
C CCCC C C C CCC
1 1134 5 7 7 762
CHANNEL DIRECTION MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
LNK
RCV
C
1
45678123
ON
The parameters of C
1
- C5 serial ports can be set up by using five sections of switches. The
C
1
section configures the C1 component port and, similarly, next sections configure corresponding component ports. Position of individual switches within the section and corresponding settings of respective ports are shown in the Table below:
45678123
ON
Channel off.
45678123
ON
Channel on.
45678123
ON
Transmission speed of 19200 bit/s
45678123
ON
Transmission speed of 9600 bit/s
45678123
ON
Transmission speed of 2400 bit/s
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45678123
ON
Transmission speed of 1200 bit/s
45678123
ON
Number of stop bits - 1
45678123
ON
Number of stop bits - 2
45678123
ON
No parity bit
45678123
ON
Type of parity bit – „odd”
45678123
ON
Type of parity bit – „even”
45678123
ON
Type of serial interface – RS-232
45678123
ON
Type of serial interface – RS-485
45678123
ON
Type of transmission – half-duplex (setting valid for the RS-485 interface only)
45678123
ON
Type of transmission – full duplex (setting valid for the RS-485 interface only)
To enable the operation with the TM-48 device for RS-232 channels, positions of MODE OF
OPERATION switches and configurations of tributary channels should be modified as follows:
45678123ON45678123
ON
Upper position of the MODE OF OPERATION switch in section 8 enables
the mode of co-operation with the TM-48 device.
45678123
ON
Required position of tributary channel configuration switch for a given C1 –
C5 channel, when the channel is activated and co-operation with TM-48 device enabled.
The C6 and C7 Ethernet ports are configurable through separate, four-position section of
switches that allows activating the port and setting the type of transmission. Available settings
and corresponding positions of the switch are given below:
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MULTIPLEXER 7x64k/2M
TRIBUTARY CHANNEL CONFIGURATION
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
LNK
BOR
AMUX
RCV
C CCCC C C C CCC
1 1134 5 7 7 762
CHANNEL DIRECTION MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
LNK
RCV
LNK
RCV
CC
76
4123
ON
LNK
RCV
4213
ON
Channel C6 off.
4213
ON
Channel C6 on.
4213
ON
Type of transmission for C6 channel: half duplex.
4213
ON
Type of transmission for C6 channel: full duplex.
4213
ON
Channel C7 off.
4213
ON
Channel C7 on.
4213
ON
Type of transmission for C7 channel: half duplex.
4213
ON
Type of transmission for C7 channel: full duplex.
Additionally, for Ethernet transmission it is possible to configure the assignment of
number of slots. The device can be configured for operation with one 64 kbit/s time slot and
with eight consecutive slots of the G.704 stream. In this case the bitrate for Ethernet channel
equals to 512 kbit/s. Selection of the “eight slots” option for the C6 channel causes occupancy
of eight consecutive slots after the slots of asynchronous channels. In case of C7 port it will be
eight 64 kbit/s slots available directly after C6 channel. This operating mode is selected by
changing the position of the last section of the CHANNEL DIRECTION switch.
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45678123ON45678123
ON
The speed of 512 kbit/s is set for ETHERNET C6 and C7 ports.
45678123ON45678123
ON
The speed of 64 kbit/s is set for ETHERNET C6 and C7 ports.
5.2 Selection of Direction in tributary channels
MULTIPLEXER 7x64k/2M
TRIBUTARY CHANNEL CONFIGURATION
TM-81
B
A
AIS
10
-3
LOF
LOS
G.703
CONFIGURATION
LNK
BOR
AMUX
RCV
C CCCC C C C CCC
1 1134 5 7 7 762
CHANNEL DIRECTION MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
LNK
RCV
45678123
ON
CHANNEL DIRECTI ON
A
B
C
1
C
7
Transmission direction for channels is selectable by using CHANNEL DIRECTION switches:
45678123
ON
Setting the switch corresponding to a given channel in upper position means
selecting this channel for receiving data from and transmitting them to line
port A.
45678123
ON
Setting the switch corresponding to a given channel in lower position means
selecting this channel for receiving data from and transmitting them to line
port B.
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5.3 Selection of time slots
MULTIPLEXER 7x64k/2M
TRIBUTARY CHANNEL CONFIGURATION
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
LNK
BOR
AMUX
RCV
C CCCC C C C CCC
1 1134 5 7 7 762
CHANNEL DIRECTION MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
LNK
RCV
CONFIGURATION
ON
45678123 910
The first timeslot from the group of slots of the 2048 kbit/s stream is selectable by using
CONFIGURATION switches (sectors 1÷5) in the following way:
Forbidden setting
Forbidden setting
TS1 slot
TS17 slot
TS2 slot
TS18 slot
TS3 slot
TS19 slot
TS4 slot
TS20 slot
TS5 slot
TS21 slot
TS6 slot
TS22 slot
TS7 slot
TS23 slot
TS8 slot
TS24 slot
TS9 slot
TS25 slot
TS10 slot
TS26 slot
TS11 slot
TS27 slot
TS12 slot
TS28 slot
TS13 slot
TS29 slot
TS14 slot
TS30 slot
TS15 slot
TS31 slot
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5.4 Selection of operating modes for channels
Drop&
Continue
Drop
CC
17
45678123
ON
MODE OF OPERATION
TM-81
MULTIPLEXER 7x64k/2M
T R I B U T A R Y C H A N N E L C O N F I G U R A T I O N
B
A
AIS
10
-3
LOF
LOS
G.703
CONFIGURATION
B
A
Droop
LNK
RCV
LNK
RCV
C CCCC C CLPCCC
TS
C
1 1134 5 7 7 762
CHANNEL DIRECTION
10BASE-T
MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
RS232/485
Continue
Droop &
Operating mode for channels is selectable by MODE OF OPERATION switches as follows:
45678123
ON
Upper position of switch corresponding to given channel means selection of
the mode with interrupted transmission path (DROP mode) for this channel.
45678123
ON
Lower position of switch corresponding to a given channel means selection of
the mode without interrupting the transmission path (DROP & CONTINUE
mode) for this channel. The DROP mode is recommended for most applications for C
6
and C7 Ethernet channels.
5.5 Selection of operating mode for the unit
TS LP
45678123
ON
CONFIGURATION
TM-81
MULTIPLEXER 7x64k/2M
T R I B U T A R Y C H A N N E L C O N F I G U R A T I O N
B
A
AIS
10
-3
LOF
LOS
G.703
CONFIGURATION
B
A
Droop
LNK
RCV
LNK
RCV
C CCCC C CLPCCC
TS
C
1 1134 5 7 7 762
CHANNEL DIRECTION
10BASE-T
MODE OF OPERATION
45678123
ON
45678123
ON
4123
ON
45678123
ON
45678123
ON
4567812 3
ON
45678123
ON
45678123
ON
45678123
ON
910
RS232/485
Continue
Droop &
Operating mode of the TM-81 multiplexer is selectable by CONFIGURATION switches (sectors 6, 7, and 10):
Normal operation, both A and B ports available.
The multiplexer works as terminal device, only B port available. Clock signal
from internal quartz generator.
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The multiplexer works as terminal device, only B port available. Clock signal
is recovered from 2048 kbit/s signal received from port B.
The multiplexer works as terminal device, only A port available. Clock signal
from internal quartz generator.
The multiplexer works as terminal device, only A port available. Clock signal
is recovered from 2048 kbit/s signal received from port A.
6 Diagnostic loops
It is possible to set up three tributary diagnostic loops in the TM-81 multiplexer:
• On the A port of line interface,
• On the B port of line interface,
• On ports A and B of line interface.
Loops are closed by using CONFIGURATION switches located on front panel of the device
(sectors 8 and 9):
Closed tributary loop from the side of A port.
Closed tributary loop from the side of B port.
Closed tributary loop from the side of A and B ports.
6.1 Tributary loop on the “A” port
The tributary loop on A port is set up by actuating the switch No. 8 belonging to the
CONFIGURATION group of switches. Closing of the loop is signaled by blinking of the AIS
diode of the port A. Simultaneously, the AIS signal is sent from the output of “B” port.
B
A
C7
CONFIGURATION
TM-81
C1
Fig. 26. Tributary loop on the “A” port
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6.2 Tributary loop on the “B” port
The tributary loop on the port “B” is set up by actuating the switch No. 9 belonging to the
CONFIGURATION group of switches. Closing of the loop is signaled by blinking of the AIS
diode of the port B. Simultaneously, the AIS signal is sent from the output of “A” port.
A
B
TM-81
C1
C7
CONFIGURATION
Fig. 27. Tributary loop on the “B” port
6.3 Tributary loop on “A” and “B” ports
The tributary loop on A and B ports forms by actuating the switches No. 8 and 9 belonging to the CONFIGURATION group of switches. Closing of the loop is signaled by blinking
AIS diodes of the ports A and B.
A
B
TM-81
C1
C7
CONFIG URATION
Fig. 28. Tributary loop on “A” and “B” ports
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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7 Distribution frame
A distribution frame type P-81 can be used with TM-81 multiplexer. The frame allows
relocating the contact points of line ports and component ports, as well as power supply and
contact alarm signal connectors to front panel of the device. The distribution frame is delivered complete with cabling set for connecting the device to transmission, power supply and
alarm connectors of the TM-81 multiplexer. The P-81 frame can be fixed to the TM-81 device
for good, by using a set of fixing brackets available as optional equipment, or can be mounted
separately. Front view of the TM-81 multiplexer + P-81 distribution frame set is shown on the
figure below.
TM-81
MULTIPLEXER 7x64k/2M
T R I B U T A R Y C H A N N E L C O N F I G U R A T I O N
TM-81
B
A
A
IS
10
-3
LOF
LOS
G.703
CONFIGURATION
B
A
Droop
LNK
RCV
LNK
RCV
C CCCC C CLPCCC
TS
C
1 1134 5 7 7 762
CHANNEL DIRECTION
10BASE-T
MODE OF OPERATION
45678123
ON
45678123
ON
4123ON45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
45678123
ON
910
RS232/485
Continue
Droop &
A
B
75
ALARMPOWER
10BASE-T 10BASE-T
2x10BASE-T
MDI-X
C
C
76
CC CCC
21345
ABBA
120
9
5
P-81
RS232/485
Fig. 29. Multiplexer type TM-81 with P-81 distribution frame
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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8 Specifications
8.1 Electrical parameters
2048 kbit/s line interface
Parameter or feature Value of parameter or description of feature
Functional / electrical compatibility standard ITU-T G.704 / ITU-T G.703
Rated bitrate
2048 kbit/s
±50 ppm
Input and output impedance
unbalanced - 75
Ω
balanced - 120
Ω
Line code HDB-3
Error rate
≤10
-9
Type of connectors
unbalanced - 2 x 1,6/5,6
balanced - DB-9
"FEMALE"
Maximum permissible attenuation of station side cable for 2048 kbit/s inputs at the fre-
quency of 1024 kHz amounts to 6 dB.
RS-232(V.28) asynchronous digital interface
Parameter or feature Value of parameter or description of feature
Electrical compatibility standard ITU-T V.28
Transmission speed
1200
÷ 19200 bit/s
Type of connector DB-9 "FEMALE"
RS-485(EIA-485) asynchronous digital interface
Parameter or feature Value of parameter or description of feature
Electrical compatibility standard EIA-485
Transmission speed
1200
÷ 19200 bit/s
Type of connector DB-9 "FEMALE"
Ethernet 10BASE-T digital interface
Parameter or feature Value of parameter or description of feature
Electrical compatibility standard IEEE 802.3
Transmission speed 10 Mbit/s
Type of connector RJ-45
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8.2 Mechanical parameters
Parameter or feature Value of parameter or description of a feature
Width 434 mm
Height 44 mm
Depth 188 mm
Weight 2,2 kg
8.3 Electromagnetic compatibility
TM-81 multiplexers meet Class A requirements concerning emission of radio interferences as specified in the PN-EN 55022 standard, provided they are installed in compliance
with this Manual.
Warning: This is a Class A device and may emit radio interferences in home environment. In such case, the user
may be required to implement suitable precautions.
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8.4 Environmental requirements
Operation
The TM-81 devices can work in closed rooms without uniform heating, in the following
environmental conditions:
Environmental parameter Permissible value
Ambient temperature
+5
÷ +40
O
C
Relative humidity of air
≤ 80% at the temperature of +20
O
C
Transportation
Multiplexers packed in original factory packaging can be transported by using land and air
transportation means at temperatures within the range of -25....+40
o
C.
Storage
TM-81 multiplexers should be stored in closed space and in the environment meeting
the following requirements:
Environmental parameter Permissible value
Ambient temperature
-25
÷ +55
O
C
Relative humidity 5 % up to 90 %, below +40 OC
Vibrations
Frequency: 10 Hz up to 55 Hz, amplitude: 0,15 mm
Duration: 10 cycles in three planes
Pollution level Typical home or office environment
8.5 Power supply
Parameter or feature
Version
marking
Value of the parameter or description of
feature
81-1-1
110
÷230 V
1)
, 0 Hz/50÷60 Hz
Rated supply voltage
81-1-2
24
÷50 V
1)
, 0 Hz
120 mA @ 110 V
81-1-1
90 mA @ 230 V
350 mA @ 24 V
Input current
81-1-2
210 mA @ 48 V
81-1-1 Power cord terminated with plug
Type of connector
81-1-2 Double screw-type terminal
1)
Permissible deviations: +10% for maximum value; -10% for minimum value.
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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9 Scope of delivery
The following items are included in the delivery:
1. TM-81.1 MULTIPLEXER 1 PC.
2. FUSE, 1,6A 2 PCS.
3. BRACKETS FOR MOUNTING IN A 19“ RACK – RH AND LH 1 PC.
4. BRACKETS FOR MOUNTING IN A 21“ RACK – RH AND LH 1 PC.
4. OPERATING MANUAL 1 COPY
5. WARRANTY CARD 1 COPY
5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
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5 X RS-232,485 + 2 X ETHERNET /2 MBIT/S G.703 (G.704) MULTIPLEXER
OPERATING MANUAL
IOA81-1E 38 August 2004
Manufactured by:
LANEX S.A.
8, Ceramiczna Street
20-150 Lublin
POLAND
Phone: (081) 444-10-11
Fax: (081) 740-35-70
e-mail: info@lanex.pl
web: www.lanex.pl
Service Department:
Phone: (081) 443-96-39
e-mail: serwis@lanex.pl
© LANEX S.A. 2004
All rights reserved
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