Telos ZephyrExpress - Manual (Page 143)

TROUBLESHOOTING 9-1
SECTION 9
TROUBLESHOOTING
First Steps 9-2
GENERAL 9-3
Thinking About Problem Solving 9-3
Diagnostic Aids 9-5
Look into the Lights 9-5
LOOPBACK modes 9-6
Some Error Conditions 9-10
No functionality; the box is totally or partly dead. 9-10
Condition: ISDN Connecting OK, But No Audio 9-11
Condition: No Audio In Both Directions 9-12
Condition: Audio In One Direction Only 9-12
Condition: Audio Distorted 9-12
Condition: Major Echo Action 9-13
Error Messages 9-13
ISDN Problems 9-13
Condition: Can’t Get ISDN Ready Ready Indication 9-13
Intermittent ISDN Problems 9-18
ISDN Cause Phrases/Values 9-18