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Chapter 1. Introduction
61200062L1-1 DSU 56/64 User Manual 1-3
Test Status/Error (Yellow/Red)
Tests defined by the above indicators are explained in greater detail
in Chapter 3, Test Modes on page 3-1.
Test Switches
The front panel also contains two push-button switches for
selecting and controlling the various test modes for the DSU 56/64.
The descriptions of these switches are as follows:
DTE O
N
SOLID
indicates DTE interface test in progress.
F
LASHING
indicates Loop Interface test (CSU Loop-
back) has been initiated by telco.
Loop O
N
SOLID
indicates loop interface test has been initiat-
ed from local DSU.
F
LASHING
indicates loop interface test (CSU or DSU
Loopback) has been initiated by telco.
RDL O
N
SOLID
indicates remote digital loopback test has
been initiated from the local DSU.
F
LASHING
indicates remote digital loopback test has
been initiated from the remote DSU.
PTRN O
N
SOLID
indicates that integral pattern generator is
being utilized for testing.
Error O
N
indicates that errors are being detected during a
test or that a test can not be properly initiated.
Select Each time this switch is activated, a valid test mode is in-
dicated by one or more LEDs being turned on solid.
Pressing the S
ELECT
button from within an active test in-
jects a bit error.
Test Once the desired test mode is displayed on the test sta-
tus indicators, the test is initiated by activating this
switch. Pressing the T
EST
button again will terminate
any test in progress.