T1 AND E1 FIBER MUXES
22
Table 4-1 (continued). Front-panel indicator, button, or connector and corresponding function.
Number Indicator/Button/Connector
Function
5
SYSTEM CALL pushbutton When the service channel is enabled, pressing this button sends an alert to the
remote operator to signal that the local operator wants to speak.
6
SYSTEM headset jack
Miniature jack for connection of headset to the service channel.
7
LOC TEST indicator
Lights when the local loopback is activated on the local mux.
8
REM TEST indicator
Lights when the remote loopback is activated on either the local or the remote
mux.
9
MAIN indicator
Lights when Force Main Link is activated.
Off in normal operation mode.
10
BACKUP indicator
Available only when the optional dual fiber link board is installed. Always off if
there is no optional board installed.
If the optional board is installed, indicator lights when Force Backup Link is
activated and is off in normal operation mode.
11
AIS MAIN indicator
Lights when the AIS signal is received on the main fiber optic link.
12
AIS BACKUP indicator
Available only when the optional dual fiber link board is installed. Always off if
there is no optional board installed.
If the optional board is installed, lights when the AIS signal is received on the
backup fiber optic link.
13
SYNC LOSS MAIN
Lights in case the main link bit error rate exceeds 10
-6
.
indicator
14
SYNC LOSS BACKUP
Available only when optional dual fiber link board is installed. Always off if there
indicator
is no optional board installed. If the optional board is installed, lights in case the
backup link bit error rate exceeds 10
-6
.
15
AIS CH1 indicator
Lights when an AIS signal is output by the corresponding channel interface.
16
AIS CH2 indicator
17
AIS CH3 indicator
18
AIS CH4 indicator
19
SYNC LOSS CH1 indicator Lights when the corresponding channel interface reports loss of input signal.
20
SYNC LOSS CH2 indicator