Multiplexer; View Of Tm-77.1 Front And Rear Panels - Lanex TM-77 Operating Manual

2.3 MD-77 multiplexer (card)
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
-3 -3
10 – error rate 10
-6 -6
10 – error rate 10
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
IOA77-1F
4 E1/G.703 P
X LESIOCHRONOUS
O
PERATING
MD-77.1
1
2
AACK
3
exceeded
exceeded
M
ULTIPLEXER
M
ANUAL
MD-77.1
7
4
5
6
May 2007