TANDBERG D13841.01 - Manual (Page 26)

TANDBERG 3G Gateway User Manual
26
4.1 PRI/BRI Status
PRI Status
The colored part of the system status indicates the condition of the ISDN PRI line. There are
three possible conditions:

Sync 30 of 30. ISDN layer 1 and 2 are up and in sync.

Sync 0 of 0, ISDN layer 1 and 2 are in sync but not up.

Red Alarm, 0 of 0, ISDN layer 1 and 2 are down, most time indicating a disconnected
ISDN line.
Besides the indications on the webpage the ISDN interface also contains 4 LEDs located at the
back-side of the 3G Gateway.
These LED
’
s indicate the following PRI status:
Green: Normal operation
Red Alarm or Loss of signal (LOS) indicates that there is no signal and thus no framing
info received. The same effect will be obtained by pulling out the PRI cable. This may
also be caused by a broken connector in the receive (RX) part of the cable.
Yellow Alarm or Remote Alarm Indicator (RAI) means that the gateway is receiving
framing info, but in this framing info the other side tells the gateway that it is not reading
the gateway
’
s transmitted framing info. Typically, this may be a broken connector in the
transmit (TX) part of the PRI cable. This could also indicate weak or noisy signal in the
transmit (TX) part of the PRI cable.
Blue Alarm indicates that the received frames are not synchronized properly.
No LED
’
s lite indicates that layer one framing is working (right protocol like for example
EURO ISDN selected), but that however there is a problem at layer 2 caused by for
example a CRC4 configuration mismatch