Additional Channels - Lanex TM-77 Operating Manual

Table 4.
Failed Failure
element condition
Loss of signal
Loss of frame
synchronization
Linear optical
Error rate
interface
> 10
Error rate
> 10
Transmitter
failure
Remote alarm
Local
interface
E1 Loss of signal
G.703,
G.704
Loss of power
Entire device
supply
– LED diode is on
1)
– alarm relay, an activated alarm is indicated by closed relay contacts (C – closed contacts,
O – open contacts). TM-77.1 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 bidirectional data transmission channels
at the speed of 10 kbit/s each.
The first of the bits – Alarm Indication Signal Bit - is used to transmit an alarm signal
to a remote device.
The other bit - National Bit - is used for communication between the supervision systems of
a local and remote device.
IOA77-1F
4 E1/G.703 P
X LESIOCHRONOUS
O
PERATING
Detected failure conditions and accompanying actions.
UA
UA
UA
-3
NUA
-6
UA
UA
UA
M
ULTIPLEXER
M
ANUAL
Actions taken
Rela
LED diode
1)
y
C O
C O
O C
C O
C O
C C
9
E1 channel signal
AIS signals are
transmitted to all E1
interfaces
AIS signals are
transmitted to all E1
interfaces
AIS signals are
transmitted to all E1
interfaces
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AIS signal is transmitted
via E1 channel to
multiplexer

May 2007
G.742
frame
bit