
Table of Contents 150-319-105-03, Revision 03
vi April 21, 1999 HLU-319 List 5
Troubleshooting _____________________________________________________________________ 37
System Alarms................................................................................................................................. 37
Alarm Option for DLC Feed............................................................................................. 38
Retiring System Alarms.................................................................................................... 38
Self Test ............................................................................................................................ 38
Loopback Operation........................................................................................................................ 38
Generic Loopback Code (GNLB)..................................................................................... 38
Addressable Repeater Loopback Functions...................................................................... 38
Initiating Manual Loopback Sessions............................................................................... 39
Loopback Test Procedures................................................................................................ 40
Loopback Configurations.................................................................................................. 41
GNLB Loopback Test Procedures.................................................................................... 42
A1LB, A2LB, and A5LB Test Procedures....................................................................... 43
A3LB and A4LB Test Procedures .................................................................................... 45
Appendix A - Specifications____________________________________________________________ 47
HDSL Insertion Loss Guidelines..................................................................................................... 48
Power Consumption ........................................................................................................................ 48
Power Consumption without Doublers............................................................................. 48
Power Consumption with Doublers.................................................................................. 49
Maximum Power Dissipation.......................................................................................................... 51
Maximum Current Drain................................................................................................................. 51
HLU-319 List 5 Card Connector..................................................................................................... 52
Network Management Control Bus .................................................................................. 52
Fuse Alarm........................................................................................................................ 52
System Alarm Output Pin................................................................................................. 53
Craft Port......................................................................................................................................... 54
Appendix B - Functional Operation _____________________________________________________ 55
Appendix C - Compatibility____________________________________________________________ 56
T1 Repeater Shelves and Related Equipment ................................................................................. 56
HiGain Doubler Circuit Deployment .............................................................................................. 56
Appendix D - Service and Support ______________________________________________________ 58
Technical Support............................................................................................................................ 58
BBS.................................................................................................................................................. 58
World Wide Web............................................................................................................................. 58
Returns............................................................................................................................................. 58
Appendix E - Glossary ________________________________________________________________ 60
Certification and Warranty______________________________________________ Inside Back Cover