Physical description 1059
In general, the first five LEDs operate as follows:
•During system power up, the LEDs are on.
•When the self-test is in progress, the LEDs flashon and off three times,
then go into their appropriate states, as shown in Table 433 "NTRB21
LED states" (page 1059).
Table433
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) Ayellow 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-layerpr inted
circuit board with buried power and ground layers.The clock controller
daughterboard is fastened by standoffs and connectors.
The NTRB21 card has seven faceplateLEDs. The first five LEDs are
associated with the NTRB21 card. The remaining two LEDs are associated
with the clock controller and DCHI daughterboards. See Figure 302
"NTRB21 TMDI card with clock controller" (page 1060).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.