Troubleshooting | 206
E1 / T1 alarm conditions
The QJET interface yellow LED indicates:
Loss of signal (LOS)
A loss of signal alarm occurs when there is no valid G.703 signal at the E1 / T1 interface RX input
from the downstream system.
This alarm masks the LOF and AIS received alarms.
Loss Of Frame alignment (LOF)
A loss of frame alignment alarm occurs when the E1 / T1 interface RX input receives a valid G.703
signal (code and frequency) but does not receive a valid G.704 signal i.e. no frame alignment
word, from the downstream system (in framed E1 / T1 modes only) (red alarm in framed T1
modes).
This alarm masks the AIS received alarm.
Alarm Indication Signal (AIS)
An AIS received alarm occurs when AIS is received from the downstream system.
An E1 / T1 interface will output AIS to the downstream system if the normal upstream traffic signal
is not available e.g. loss of modem synchronization, loss of RF signal across the link (blue alarm in
framed T1 modes).
Remote Alarm Indicator (RAI)
A remote alarm indicator occurs when RAI is received from the downstream system when it has
an active LOS or LOF alarm (TS0 NFAS bit 3 in framed E1 modes and yellow alarm in framed T1
modes).
TS16 Loss of signal (TS16LOS)
A TS16 loss of signal alarm occurs when there is no valid TS16 signal at the E1 interface RX input
from the downstream system (in E1 PCM 30 modes only).
TS16 Remote Multi-frame Alarm Indicator (RMAI)
A remote multiframe alarm indicator occurs when RMAI is received from the downstream system
when it has an active TS16LOS alarm (TS16 F0 bit 6 in E1 PCM 30 modes only).
TS16 Alarm Indication Signal (TS16AIS)
A TS16 Alarm Indication Signal alarm occurs when AIS is received from the downstream system
in TS16.
An E1 interface will output the TS16 AIS signal to the downstream system if the normal TS16
multi-frame signal is not available (in E1 PCM 30 modes only).
The QJET interface green LED indicates:
The QJET interface green LED flashes when the E1 / T1 port loopback is active.
Содержание Aprisa XE
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