61200.078L1-1
DSU 5600 User Manual
3
Chapter 1. Introduction
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
.
Select and Test Buttons
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.
