Manualshelf

Command Reference Guide

ManualsBrandsHP ManualsRoutersHP 5000 Router Series
661662663664665666667668669670
3Com Router 5000 Family and Router 6000 Family ft1 sendloopcode ● 187
Command Reference
In LLB mode, all 193 bits (one synchronization bit and 192 effective bandwidth bits) in
a T1 PCM frame are looped back. In PLB mode, however, only 192 effective
bandwidth bits are looped back.
The format of loopback code can be compliant with ANSI T1.403 or AT&T TR 54016.
In SF framing, LLB code is sent using the effective bandwidth (slots 1 through 24). In
ESF framing, both LLB code and PLB code are sent/received in the FDL in ESF frames.
This command is used in conjunction with the far-end T1 device. The far-end device
must be able to set loopback mode depending on the detected loopback code.