Carrier Access Access Navigator Manuel D’Utilisation

The DS1 must be set Out of Service, using the set ds1 <n> down command, 

before you can use loopbacks or test patterns.

n

n

n

n

n

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.

send ds1 <n> csu <loopup|loopdown>

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