Nortel Circuit Card Installation Manual page 828

Page 828 of 906
Table 262
NTRB21 LED states
LED State
DIS On (Red)
Off
ACT On (Green)
Off
RED On (Red)
Off
YEL On (Yellow)
Off
LBK On (Green)
Off
Power requirements
553-3001-211 Standard 3.00
NTRB21 DTI/PRI/DCH TMDI card
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 262.
Definition
The NTRB21 circuit card is disabled.
The NTRB21 is not in a disabled state.
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.
An alarm state or loopback state exists, or the card has been
disabled. See the other faceplate LEDs for more information.
A red-alarm state has been detected.
No red alarm.
A yellow alarm state has been detected.
No yellow alarm.
NTRB21 is in loop-back mode.
NTRB21 is not in loop-back mode.
Figure 177 on page 829
The DTI/PRI obtains its power from the backplane, and draws less than
2 amps on +5 V, 50 mA on +12 V, and 50 mA on –12 V.
August 2005
shows the faceplate of the NTRB21 TMDI card.