User's Manual

PAGE 42 61280.003L1-1B
4/12/99
“LBK-A” OR “LBK-B” IS LIT
This alarm will activate when a software or manual T1 loopback
has been established.
RECOMMENDED ACTION
POSSIBLE CAUSE (SEE LIST BELOW)
• A loopback has been commanded from the
VT-100 user interface. .................................................................... 1,2
• The “LBK-A” or “LBK-B” button has been pressed........................ 1,2
RECOMMENDED ACTIONS:
1. Through the VT-100 user interface, deactivate the loopback in the
Loopback Menu.
2. Press the “LBK-A” or “LBK-B” button to deactivate the loopback.
“AIS/YEL” ON T1-A OR T1-B IS LIT
The AIS/YEL light will flash for AIS when the DS1/DSX-1 input
receives a “blue code” (a string of 2316 1s with no more than one
zero). The indicator will remain on (solid) if a YEL signal is present
on the T1.
RECOMMENDED ACTION
POSSIBLE CAUSE (SEE LIST BELOW)
• For AIS, the DS1/DSX-1 equipment is sending
a “blue code” (all 1s) to the T1 input. ........................................... 1,2
• For YEL, the received T1 is receiving a yellow
signal from the far-end T1, indicating the far-
end T1 is RED. ................................................................................ 3-5
RECOMMENDED ACTIONS:
1. Reset the T1 equipment and verify normal operation.
2. Verify the presence of a DS1/DSX-1 signal at the T1 monitor jack
using a T1 test set.
3. Check the far-end equipment for alarms or a red condition.
4. Check the T1 connections at the far-end equipment.
5. Reset the far-end equipment.
S
ECTION 4
I M P O R T A N T
If problems persist after you have followed the Recommended
Actions, contact ADTRAN Technical Support at [phone].