A3Lb And A4Lb Test Procedures - PairGain HiGain HLU-319 Manual

Revision 01

A3LB and A4LB Test Procedures

The HLU-319 List 4B can provide a local loopback (NLOC) by sending the
Addressable Office Repeater (AOR) LPBK activation code 1111(F) 1111(F)
0001(1) 1110(E) for at least five seconds. This causes the HLU-319 List 4B
to enter the NLOC state. The Loopback Time-out option is user settable to:
•
NONE (0 minutes)
•
20 minutes
•
60 minutes
•
120 minutes
on the System Settings menu (Loopback Timeout option).
The loopback time option determines the duration of a loopback unless it is
overridden by the reception of a second identical 16-bit loop-up command
before the timer expires. When the time-out override state exists, the only
way to loop down the HLU-319 List 4B is to issue one of the three loopdown
commands. The automatic time-out mode is restored during subsequent
loopback sessions.
Table 5 summarizes the executable codes for HiGain loopbacks. Note that all
code sequences must be present for at least five seconds. The abbreviations
used in the table are as follows:
•
LU = LoopUp
•
LD = LoopDown
•
NI = Network Interface
•
CI = Customer Interface
•
ESF-DL = Extended Super Frame-Data Link
38
December 22, 1997
PairGain Engineering - Plant Series
150-319-142-01
HLU-319 List 4B