Nortel Networks 1000 User Manual
Page 164
164
NT5D11 and NT5D14 Lineside T1 Interface cards
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
for information on T1 link maintenance.
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 has been 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 has been
subsequently disabled in the MMI, the LED stays 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 LED indicates that the Lineside T1 card has
detected a yellow alarm signal from the terminal equipment side of the T1
link. See the
“QPC43 Peripheral Signaling card” (page 101)
for information
on T1 link maintenance. If the terminal equipment detects a red alarm
condition, such as not receiving a signal or the signal has exceeded
bit error thresholds or frame slip thresholds, it can send a yellow alarm
signal to the Lineside T1 card, depending on whether or not the terminal
equipment supports this feature. If a yellow alarm signal is detected, the
LED lights.
The MAINT LED indicates if the Lineside T1 card is fully operational
because of certain maintenance commands being issued through the MMI.
See
“QPC43 Peripheral Signaling card” (page 101)
for information on T1
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.
The faceplate of the card is twice as wide as the other standard analog
and digital line cards, and occupies two card slots. It comes equipped with
four LED indicators. See
Figure 29 "Lineside T1 card - block diagram"
.
The LEDs provide status indications on the operations as described in
Table 65 "Lineside T1 card LED operation" (page 165)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.