Nortel Networks 1000 User Manual

Page 259

Physical description

259

Table 97
LEI card LED operation (cont’d.)

LED

Operation

Red alarm

E1 near end

Yellow alarm

E1 far end

Maint

Maintenance

The STATUS LED indicates if the LEI has successfully passed its self
test, and therefore, if it is functional. When the card is installed, this LED
remains lit for two to five seconds as the self-test runs. If the self-test
completes successfully, the LED flashes three times and remains lit. When
the card is configured and enabled in software, the LED goes out. If the
LED continually flashes or remains weakly lit, replace the card.

The STATUS LED indicates the enabled/disabled status of both card
slots of the LEI simultaneously. To properly enable the card, both the
motherboard and the daughterboard slots must be enabled. The STATUS
LED turns off as soon as either one of the LEI slots are enabled. No LED
operation is observed when the second card slot is enabled. To properly
disable the card, both card slots must be disabled. The LED does not turn
on until both card slots are disabled.

The RED ALARM LED indicates if the LEI has detected an alarm
condition from the E1 link. Alarm conditions can include such conditions
as not receiving a signal, the signal has exceeded bit error thresholds
or frame slip thresholds. See

“Man-Machine E1 maintenance interface

software” (page 284)

for information on E1 link maintenance.

If one of these alarm conditions is detected, this LED turns on. Yellow
alarm indication is sent to the far end as long as the near end remains in a
red alarm condition. Depending on how the Man Machine Interface (MMI)
is configured, this LED remains lit until one of the following actions occur:

•

If the "Self-Clearing" function is enabled in the MMI, the LED clears
the alarm when the alarm condition is no longer detected. This is the
factory default configuration.

•

If the "Self-Clearing" function has not been enabled or it has been
subsequently disabled in the MMI, the LED alarm indication stays lit
until the command "Clear Alarm" is typed in the MMI, even though the
carrier automatically returned to service when the alarm condition was
no longer detected.

The YELLOW ALARM LED indicates that the LEI has detected a
yellow alarm signal from the terminal equipment side of the E1 link.
See

“Man-Machine E1 maintenance interface software” (page 284)

for

information on E1 link maintenance. If the terminal equipment detects a

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008