Specifications

Watson-TDM-Manual-W.doc
Version 2.0-01
Watson TDM
Operating Manual
Revision: 2008-02-07 6-3
6.3 Alarm Conditions
An alarm condition is displayed on the LEDs if one of the following conditions oc-
curs:
Urgent alarm (red):
• Hardware or software failure (blinking)
• Loss of signal / frame alignment on the DSL side (LOSW)
• DSL block-error-rate according G.826 ≥ 30% (BER-H)
• LTU only: overcurrent detected in remote power feeding circuit (CLD)
Non-urgent alarm (amber):
• DSL block-error-rate according G.826 > 15% (BER-L)
• Either Loop 1, Loop 2, Analog Loopback, or the Regenerator Loopback is ac-
tive (LOOP1, LOOP2, ALB, LOOPREG, BERT)
• Alarm cut off is activated (ACO)
E1 Interface:
• LOS-S: loss of signal
• LFA-S: loss of frame alignment
• EXT-LOC: Loss of external clock (in external clock mode only)
• AIS-S: Receiving AIS on E1 side
• BER-S: Excessive block error rate on E1 side
PRA Interface:
• Loss of signal at the T reference point (LOS-S)
• Loss of frame at the T reference point (LFA-S)
• Receiving AIS at the T reference point (AIS-S)
• Loss of frame at the V3 reference point (LFA-V3)
• Receiving AIS at the V3 reference point (AIS-V3)
nx64 kbit/s Interface:
• LOC: Loss of codirectional clock or clock rate mismatch (clock mode: nx64
Port) on the nx64 kbit/s side
• DTR-S: Data Terminal Ready (DTR, circuit 108/2) on the nx64 Port is de-
tected as 'OFF'. For X.21, the control-signal (C) is represented by DTR.
• The loops 1 and 2 can be controlled by the circuits 140 (RL) and 141 (LL),
thus the alarms LOOP1 and LOOP2 can also be caused by the nx64 kbit/s in-
terface
If no alarm condition is present then the LED will be green. Displaying an urgent
alarm has a higher priority than displaying a non-urgent one.