Owner's manual

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 Table 404

"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 Figure

278 "NTRB21 TMDI card with clock controller" (page 960).

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008