User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 7-27
Diagnostics & Troubleshooting
Testing Low-Speed Interface Operation
Testing the Low-Speed Far-End with Loop Tests
 Activating Far-End Loopbacks in M23 Framing Mode ... 7-27
 Activating Far-End Loopbacks in C-Bit Framing Mode ... 7-27
 Testing the Network to the Far-End Through a Low-Speed Drop ... 7-28
When one of the following Activate Loopback commands is received by the far-end, the
corresponding low-speed circuit is set to Equipment loopback mode. The loopback status can be
observed by the ds1 and status ds1 (ls and status ls) commands. Also, the Low-Speed Status LED
is set to YELLOW.
Activating Far-End Loopbacks in M23 Framing Mode
When the Wide Bank is configured for M23 framing, the following low-speed far-end loopup
and loopdown commands are available:
ds1 [n|range|list|all] send [niu|csu]
[loopup|loopdown] [network|drop]
Sends a loop up or loop down code to the specified far-end for loop mode control.
Activating Far-End Loopbacks in C-Bit Framing Mode
When the Wide Bank is configured for C-bit framing, the following low-speed far-end loopup
and loopdown control is available.
The commands that control the far-end low-speed loop mode:
ds1 [n|range|all] send [niu|csu|cbit]
[loopup|loopdown] [network|drop]
Sends a loop up or loop down code to the specified far-end for loop mode control.