Nortel Networks 1000 User Manual
Page 959
Physical description
959
•
During system power up, the LEDs are on.
•
When the self-test is in progress, the LEDs flash on and off three
times, then go into their appropriate states, as shown in
"NTRB21 LED states" (page 959)
.
Table 404
NTRB21 LED states
LED
State
Definition
DIS
On (Red)
The NTRB21 circuit card is disabled.
Off
The NTRB21 is not in a disabled state.
ACT
On (Green)
The NTRB21 circuit card is in an active state. No alarm states
exist, the card is not disabled, nor is it in a loopback state.
Off
An alarm state or loopback state exists, or the card has been
disabled. See the other faceplate LEDs for more information.
RED
On (Red)
A red-alarm state has been detected.
Off
No red alarm.
YEL
On (Yellow)
A yellow alarm state has been detected.
Off
No yellow alarm.
LBK
On (Green)
NTRB21 is in loop-back mode.
Off
NTRB21 is not in loop-back mode.
The NTRB21 card uses a standard 9.5" by 12.5" multi-layer printed
circuit board with buried power and ground layers.The clock controller
daughterboard is fastened by standoffs and connectors.
The NTRB21 card has seven faceplate LEDs. The first five LEDs
are associated with the NTRB21 card. The remaining two LEDs are
associated with the clock controller and DCHI daughterboards. See
278 "NTRB21 TMDI card with clock controller" (page 960)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.