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4
X
E1/G.703 P
LESIOCHRONOUS
M
ULTIPLEXER
O
PERATING
M
ANUAL
IOA77-1F
7
May 2007
2.3 MD-77 multiplexer (card)
MD-77.1
4
5
6
MD-77.1
AACK
1
2
3
Figure 5.
View of TM-77.1 front and rear panels
1 - power supply indication diode
2 - group of signaling diodes:
LOESn – loss of electrical signal coming in n-channel
LOOS – loss of optical receiver input signal
LDF– laser diode failure (loss of optical transmitter output power)
LOF – loss of frame synchronization of the 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 cancellation button
4- optical receiver input
5- optical receiver output
6 120
Ω
symmetric linear signal input/output - DSUB-25 connector
Содержание TM-77
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