Nortel Circuit Card Installation Manual page 196

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Table 76
NT5D14AA Lineside T1 faceplate LEDs
LED
STATUS
RED
YEL
MAINT
553-3001-211 Standard 3.00
NT5D11 and NT5D14 Lineside T1 Interface cards
In general, the LEDs operate as shown in Table 76.
State
On (Red)
Off
On (Red)
Off
On (Yellow)
Off
On (Red)
Off
The LED indicates that the lineside T1 card has successfully passed
STATUS
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.
August 2005
Definition
The NT5D14AA card either failed its self-test or it
hasn't yet been configured in software.
The card is in an active state.
A red alarm has been detected from the T1 link.
(This includes, but is not limited to: not receiving a
signal, the signal has exceeded bit error thresholds
or frame slip thresholds.)
No red alarm exists.
A yellow alarm state has been 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).
No yellow alarm.
The card detects whether tests are being run or that
alarms have been disabled through the
Man-Machine Interface. The LED will remain lit until
these conditions are no longer detected.
The lineside T1 card is fully operational.