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Isolating Problems Using Loopback Data Tests
D-12 Issue 2 November 1996
Arrangement. If this succeeds, the problem is isolated to the network or to the
remote host equipment. The user is then instructed to call a Loop-Around Data
Test Arrangement at the host site (see Figure D-8). If this call succeeds, then
the problem is not in the network between the switches.
Figure D-8. Using the Loop-Around Data Test Arrangement in a Network
Setting Up a Loop-Around Data Test
Arrangement
The Loop-Around Data Test Arrangement does not require special switch
administration over and above the normal switch administration procedure for
the 8400B Plus Data Module.
If the Loop-Around Data Test Arrangement is being used to test modem pools
(see Figure D-7), separate 8400B Plus Data Modules must be set up for each
Terminal
or
PC
Data Module,
PC/PBX,
or
Asynchronous
Data Unit
8400B Plus
Host
Data Module
Loopback
Plug
DCP
or ADU
Loop-Around Data
Test Arrangement
Two-Wire
DEFINITY
Communications
System
G3V2
or later
DEFINITY
Communications
System
G3V2
or later