Carrier Access Access Navigator - Manual (Page 376)

15-34 August 2003 Access Navigator - Release 1.8
Diagnostics & Troubleshooting
DS1 NIU Loopup
DS1 NIU Loopup
Sends an in-band (bit pattern) line loopup or loopdown code over the Access Navigator DS1. The NIU
loopup is used with other commands and test equipment to verify that the DS1 signal is reaching a far-
end Network Interface Unit (NIU), such as a “Smart Jack,” which should loop the received DS1 payload
back to the DS1 transmit output. See Figure 15-9.
Note: This command works with ESF or D4 (SF) framing.
Syntax: send ds1 niu <loopup|loopdown>
Figure 15-9. Send DS1 NIU Line Loopup
DS1
Line
Interface
Unit
Framer
Access Navigator
Time Slot
Interchange
Code
Generator
NIU
Loopup
Command
Inband
Code
IN
OUT
NIU
Far End
Line Loopup
Smart Jack