Carrier Access Access Navigator user manual Far-End Loopbacks, DS1 CSU Loopup

Diagnostics & Troubleshooting

Far-End Loopbacks

Far-End Loopbacks

NOTE: The DS1 must be set Out of Service, using the set ds1 <n> down command, before you can use loopbacks or test patterns.

￿DS1 CSU Loopup ... 15-31

￿DS1 Line Loopup ... 15-32

￿DS1 Network Loopup ... 15-33

￿DS1 NIU Loopup ... 15-34

￿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 <n> csu <loopuploopdown>

CSU	Access Navigator		Inband		Far End
		Code
Loopup
		Generator	Code	Line Loopup
Command
				Access Bank

Time Slot Interchange

Framer

Line

Interface

Unit

IN

DS1 OUT

CSU

Figure 15-6. Send DS1 CSU Line Loopup

Access Navigator - Release 1.8 August 2003 15-31