Nortel Networks Circuit Card 311 - Manual (Page 268)

268 NT5D33 and NT5D34 Lineside E1 Interface cards
information on E1 link maintenance. If the terminal equipment detects a
red alarm condition such as not receiving a signal, or the signal exceeds
bit-error thresholds or frame-slip thresholds, a yellow alarm signal is sent to
the LEI, if the terminal equipment supports this feature. If a yellow alarm
signal is detected, the LED turns on.
The MAINT LED indicates if LEI is fully operational because of
certain maintenance commands that are issued through the MMI. See
"Man-Machine E1 maintenance interface software" (page 292) for
information on E1 link maintenance. If the card detects that tests are being
run or that alarms are disabled through the MMI, the LED lights and remains
lit until these conditions are no longer detected, then it turns off.
Functional description
Figure 57 "LEI card - block diagram" (page 268) shows a block diagram of
the major functions contained on the LEI card. Each of these functions is
described on the following pages.
Figure 57
LEI card - block diagram
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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