Carrier Access Access Navigator - Manual (Page 373)

Access Navigator - Release 1.8 August 2003 15-31
Diagnostics & Troubleshooting
Far-End Loopbacks
Far-End Loopbacks
NOTE: The DS1 must be set Out of Service, using the set ds1 down command,
before you can use loopbacks or test patterns.
n DS1 CSU Loopup ... 15-31
n DS1 Line Loopup ... 15-32
n DS1 Network Loopup ... 15-33
n DS1 NIU Loopup ... 15-34
n DS1 Payload Loopup ... 15-35
DS1 CSU Loopup
Sends an in-band (bit pattern) line loopup or loopdown code over the drop DS1. The Channel Service
Unit (CSU) should loop the received DS1 frame back to the DS1 transmit output. See Figure 15-6.
Note: CSU loopups can be used with either unframed (line) or framed (payload) patterns and test
commands.
Note: This command works with ESF framing and T1.403 FDL, or with SLC-96/TR-08 framing for
Shelf A. An Access Bank II using CA FDL management will ignore this command.
Syntax: send ds1 csu <loopup|loopdown>
Figure 15-6. Send DS1 CSU Line Loopup
DS1
Line
Interface
Unit
Framer
Access Navigator
Time Slot
Interchange
Code
Generator
CSU
Loopup
Command
Inband
Code
IN
OUT
CSU
Access Bank
Far End
Line Loopup