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Watson-Ethernet-Manual.doc

Version 3.3-01

Watson Ethernet

Operating Manual

Revision: 2010-01-20

5-3

5.2.2 Back LEDs

The Watson Ethernet tabletop modem is fitted with 2 LEDs on the backpanel in-

dicating the status of the Ethernet interface: (Activity ACT and High-Speed HS

indicator):

Status LED

ACT (Green)

HS (Amber)

Link down

Off

Link up, 10 Mbps, no activity

Off

Link up, 100 Mbps, no activity

Link up, 10 Mbps, activity

Blinking

Off

Link up, 100 Mbps, activity

Blinking

Table 5-5: Tabletop backpanel Ethernet LED indications

5.3 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)

 Plug-in 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, BERT)

 Link integrity alarm on Ethernet user interface

 Alarm cut off is activated (ACO)

5.4 Alarm Relays

5.4.1 Plug-in

Plug-in alarms can be signaled through relay contacts present on the ACU2R

which is normally installed in the subrack. Two relays are present on the ACU2R

for urgent and non-urgent alarms.

Note:

The ACU-48R is not compatible with the Watson Ethernet plug-in.

Under normal plug-in power conditions the two output stages of each plug-in are

controlled by its microcontroller. In case of a power failure on an plug-in, both the

“Urgent” and “Non-urgent” alarms will be activated on the ACU. (The ACU gene-

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