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The Model 1080A Series features V.52 compliant bit error rate pattern
tests and two V.54 test modes: local analog loopback and remote digital
loopback. The operator at the local end may test both local and remote
modems, plus the line, in the digital loopback mode. Both RDL and LAL
modes can be controlled by a manual switch or via the V.24/RS-232
interface.
The Model 1080A Series is fairly simple to install and is ruggedly
designed for excellent reliability: just set it and forget it. The following
instructions will help you set up and install the Model 1080A properly.
3.1 CONFIGURATION SWITCHES
The Model 1080A Series uses a unique set of 24 external mini DIP
switches that allow configuration to an extremely wide range of applica-
tions. These 24 DIP switches are grouped into three eight-switch sets,
and are externally accessible from the underside of the unit (see
Figure 1). Since all configuration DIP switches are externally accessible,
there is no need to open the case for configuration.
The configuration switches allow you to select data rates, clocking meth-
ods, V.52 & V.54 tests, word lengths, extended signaling rates, async. or
sync. mode, 2- or 4-wire operation, anti-stream control and input imped-
ance. The drawings, text and tables on the following pages describe all
switch locations, positions and functions.
Figure 1. Underside of Model 1080A Series, showing location of DIP switches
3.0 CONFIGURATION OVERVIEW
FRONT
ON
ON
1
ON
1
ON
1
OFF
S1
2
3
4
5
6
7
8
S2
2
3
4
5
6
7
8
S3
2
3
4
5
6
7
8
REAR
7
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