A1Lb, A2Lb, And A5Lb Test Procedures - PairGain HiGain HLU-319 Manual

Revision 01
Notes on GNLB Loopback Test Procedures:
•
The HLU-319 List 4B can be looped up from the remote location
(CREM) by issuing the (6-in-7) command at the HRU-412 List 8B DS1
input port.
•
The HRU-412 List 8B can be looped up from the remote location
(CLOC) by issuing the (5-in-7) command at the HRU DS1 input port.

A1LB, A2LB, and A5LB Test Procedures

To perform the HLU-319 List 4B A1LB, A2LB, and A5LB test procedures:
1 Send the HLU-319 List 4B the in-band ARMING and NI LPBK code
11000 for at least five seconds.
2 Monitor the output of the HLU-319 List 4B for the return of the pattern.
Return of the pattern indicates that:
•
the HRU has looped up (if the SMJK loopback option is enabled)
•
an external NI has looped up (if the SMJK loopback option is
disabled) and that the HLU-319 List 4B and the HRU-412 List 8B
are ARMED
3 Verify, if possible, that the HRU-412 List 8B Loopback LED is flashing,
indicating that the HRU-412 List 8B is armed, or is lit steadily, indicating
that it is both armed and in loopback.
4 Once armed, the HLU-319 List 4B can be looped back by sending
Intelligent Office Repeater (IOR) LPBK activation code 1101 0011 1101
0011 (D3D3) for at least five seconds. The tester observes the following
activation response, in the order shown below:
a two seconds of AIS (all 1s)
b five seconds of returning data pattern
c 231 logic errors (including the frame bit) occurring in the returned
pattern comprising 20 errors if ILR-2 (HRU-412 List 8B) was sent
d normal looped data
This error pattern repeats every 20 seconds as long as the IOR loopback
pattern is being sent. This same 20 second repeat scenario also applies to
ILR, Time-out Override, and Query commands.
34
December 22, 1997
PairGain Engineering - Plant Series
150-319-142-01
HLU-319 List 4B