Nortel NT1R20 Description page 102

Page 78 of 290 NT5D11 Line-side T1 Interface Card
553-3001-105 Standard 5.00 June 1999
Note: Note: The STATUS LED indicates the enabled/disabled status of
both card slots of the line-side T1 card simultaneously. To properly
enable the card, both the motherboard and the daughterboard slots must
be enabled. The STATUS LED will turn out as soon as either one of the
line-side T1 card slots have been enabled. No LED operation will be
observed when the second card slot is enabled. To properly disable the
card, both card slots must be disabled. The LED will not turn on until
both card slots have been disabled.
The RED ALARM LED indicates that the line-side T1 card has detected an
alarm condition from the T1 link. Alarm conditions include, but are not
limited to, such conditions as not receiving a signal or the signal has exceeded
bit error thresholds or frame slip thresholds. (See "Man-Machine T1
maintenance interface software" on page 109 for information on T1 link
maintenance.)
If one of these alarm conditions is detected, this LED will light. 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 will remain lit until the following actions occur:
— If the "Self-Clearing" function has been enabled in the MMI, the LED
will clear the alarm when the alarm condition is no longer detected (this
is the factory default condition).
— If the "Self-Clearing" function has not been enabled or it has been
subsequently disabled in the MMI, the LED will stay lit until the
command "Clear Alarm" has been typed in the MMI, even though the
carrier automatically returned to service when the alarm condition was
no longer detected.
The
YELLOW ALARM
a yellow alarm signal from the terminal equipment side of the T1 link. (See
the "Man-Machine T1 maintenance interface software" on page 109 for
information on T1 link maintenance.) If the terminal equipment detects a red
alarm condition (including, but not limited to, such conditions as not
receiving a signal or the signal has exceeded bit error thresholds or frame slip
thresholds), it may send a yellow alarm signal to the line-side T1 card,
depending on whether or not your terminal equipment supports this feature.
If a yellow alarm signal is detected, this LED will light.
LED indicates that the line-side T1 card has detected