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Table 143
NTRB21 LED states
LED
DIS
On (Red)
ACT
On (Green)
RED
On (Red)
YEL
On (Yellow)
LBK
On (Green)
Power requirements
Foreign and surge voltage protection
553-3011-100
Standard 14.00
NTRB21 DTI/PRI/DCH TMDI card
.
State
The NTRB21 circuit card is disabled.
Off
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.
Off
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.
Off
No red alarm.
A yellow alarm state has been detected.
Off
No yellow alarm.
NTRB21 is in loop-back mode.
Off
NTRB21 is not in loop-back mode.
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.
Lightning protectors must be installed between an external T-1 carrier facility
and the Option 11C cabinet. For public T-1 facilities, this protection is
provided by the local operating company. In a private T-1 facility
environment (a campus, for example), the NTAK92 protection assembly may
be used.
The NTRB21 circuit card conforms to safety and performance standards for
foreign and surge voltage protection in an internal environment.
January 2002
Definition
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