Avaya Nortel Communication Server 1000 Reference page 152

NT5D11 and NT5D14 Lineside T1 Interface cards
LED
YEL
MAINT
The STATUS LED indicates that the Lineside T1 card has successfully passed its self test, and
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 flashes
continuously, or remains weakly lit, replace the card.
Note:
The STATUS LED indicates the enabled/disabled status of both card slots of the Lineside
T1 card 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 Lineside T1 card 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 that the Lineside T1 card has detected an alarm condition
from the T1 link. Alarm conditions can include such conditions as not receiving a signal or the
signal has exceeded bit error thresholds or frame slip thresholds. See
maintenance interface software
If one of these alarm conditions is detected, the red LED lights. 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 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.
• If the "Self-Clearing" function hasnot been enabled or it is subsequently disabled in the
MMI, the LED 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 Lineside T1 card has detected a yellow alarm
signal from the terminal equipment side of the T1 link. See
152 Circuit Card Reference
State
Off No red alarm exists.
On (Yellow) A yellow alarm state is detected from the terminal
equipment side of the T1 link. If the terminal equipment
detects a red alarm condition, it may send a yellow
alarm signal to the Lineside T1 card (this depends on
whether or not your terminal equipment supports this
feature).
Off No yellow alarm.
On (Red) The card detects whether tests are being run or that
alarms are disabled through the Man-Machine
Interface. The LED remains lit until these conditions
are no longer detected.
Off The Lineside T1 card is fully operational.
on page 175 for information about T1 link maintenance.
Comments? infodev@avaya.com
Definition
Man-Machine T1
Man-Machine T1 maintenance
July 2011