Owner's manual

956 NTRB21 DTI/PRI/DCH TMDI card

Figure 276

NTRB21 TMDI card with clock controller

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 flash on and off three

times, then go into their appropriate states, as shown in Table 403

"NTRB21 LED states" (page 956).

Table 403

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.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008