Owner's manual

Physical description 957

Table 403

NTRB21 LED states (cont’d.)

LED

State

Definition

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.

Figure 277 "NTRB21 TMDI card faceplate" (page 958) shows the faceplate

of the NTRB21 TMDI card.

The NTRB21 card uses a standard IPE-sized (9.5" by 12.5"), multi-layer

printed circuit board with buried power and ground layers. It is keyed to

prevent insertion in slot 10. The clock controller daughterboard is fastened

by standoffs and connectors.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 02.06 Standard

27 August 2008