
Table of Contents 152-319-100-02, Revision 02
vi April 21, 2000 H2TU-C-319 List 1and 1C
Alarm History at the HDSL2 Interface............................................................................. 34
Using the Event Log to Track System Events................................................................................. 35
Troubleshooting _____________________________________________________________________ 37
Front-panel System Alarms............................................................................................................. 37
Alarm Option for DLC Feed............................................................................................. 38
Retiring System Alarms.................................................................................................... 38
Remote LOS and AIS Response....................................................................................... 39
OCT55 Test Pattern with AMI Line Code...................................................................................... 39
Loopback Operation........................................................................................................................ 40
Generic Loopback Commands.......................................................................................... 40
Special Loopback Commands........................................................................................... 42
Manual Loopback Session ................................................................................................ 43
Loopback Test Procedures .............................................................................................................. 44
General Troubleshooting Tips .......................................................................................... 44
GNLB Test Procedures..................................................................................................... 44
A1LB, A2LB, and A5LB Test Procedures....................................................................... 46
A3LB and A4LB Test Procedures .................................................................................... 49
Appendix A - Specifications____________________________________________________________ 50
Power Consumption ........................................................................................................................ 51
Maximum Power Dissipation.......................................................................................................... 51
Maximum Current Drain................................................................................................................. 51
H2TU-C-319 Card Connector......................................................................................................... 52
Network Management Control Bus .................................................................................. 52
Fuse Alarm........................................................................................................................ 52
System Alarm Output Pin................................................................................................. 53
Craft Port......................................................................................................................................... 53
Appendix B - Functional Operation _____________________________________________________ 54
Timing ............................................................................................................................................. 54
Ground Fault Detect........................................................................................................................ 54
Appendix C - Compatibility____________________________________________________________ 55
Appendix D - Product Support _________________________________________________________ 56
Technical Support............................................................................................................................ 56
World Wide Web............................................................................................................................. 56
Returns............................................................................................................................................. 56
Appendix E - Abbreviations____________________________________________________________ 59
Certification and Warranty______________________________________________ Inside Back Cover