Owner`s manual

MT56DSU2 Owner’s Manual
82017502 22
4.3.3 Digital Loopback Test With Test Pattern Test
This test allows you to test the local MultiDSU56K, the communications link, and the remote
MultiDSU56K. Use the following steps to perform the Digital Loopback Test with the Pattern Test.
With this test enabled, the MultiDSU56K sends and detects a pre-defined 15-bit pseudo-random
test pattern. When an error is detected by the MultiDSU56K, the NS (No Signal) LED flashes.
1. Set DIP switch #9 on the remote MultiDSU56K to the down position.
2. Set DIP switch #10 on the local MultiDSU56K to the down position.
3. The test pattern is generated and either detected as a good test pattern (test patterns match)
or as a failed test (test pattern received does not match the pattern sent).
Test Pattern
Generator
Test Pattern
Detector
No Signal
(NS)
LED
Local MultiDSU56K
(In Test Pattern Mode)
Remote MultiDSU56K
(In Digital Loopback Mode)
4.3.4 Test Pattern Test
This test allows you to test the local MultiDSU56K, the communications link, and the remote
MultiDSU56K.
With this test enabled, the MultiDSU56K sends and detects a pre-defined 15-bit pseudo-random
test pattern. When an error is detected by the MultiDSU56K, the NS (No Signal) LED flashes. To
enable the Test Pattern Test, perform the following.
1. Set DIP switch #10 on both the local and the remote MultiDSU56K to the down position.
2. The test pattern is generated and either detected as a good test pattern (test patterns match)
or as a failed test (test pattern received does not match the pattern sent).
Test Pattern
Detector
Test Pattern
Generator
No Signal
(NS)
LED
Local MultiDSU56K
(in Test Pattern mode)
Remote MultiDSU56K
(in Test Pattern mode)
No Signal
(NS)
LED
Test Pattern
Generator
Test Pattern
Detector
(Network)