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Select and Test Buttons
61200.078L1-1
Test Status/Error (Yellow/Red)
DTE
On indicates DTE interface test in progress.
Flashing indicates loop interface test (CSU Loopback)
has been initiated by the telco.
Loop
On solid indicates loop interface test has been
initiated from local DSU.
Flashing indicates loop interface test (CSU or DSU
Loopback) has been initiated by the telco.
RDL
On solid indicates remote digital loopback test has
been initiated from the local DSU.
Flashing indicates remote digital loopback test has
been initiated from the remote DSU.
PTRN
On indicates integral pattern generator is being
utilized for testing.
Error
On solid indicates remote digital loopback test has
been initiated from the local DSU.
Flashing indicates remote digital loopback test has
been initiated from the remote DSU.
For more information on the tests indicated by the indicators
described previously see the chapter Test Modes.
The front panel also contains two push-button switches for
selecting and controlling the various test modes for the DSU
5600.
Select
Each time this switch is pressed the current test
mode is displayed by turning On one or more LEDs
to indicate the specific test.
Test
Once the desired test mode is displayed on the test
status indicators, the test is initiated by activating
this switch. This switch is also activated to termi-
nate any test in progress.
DSU 5600 User Manual
Chapter 1. Introduction
3
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