ADTRAN Network Router DSU 56 Bedienungsanleitung PDF herunterladen (Seite 34)

Chapter 3. Test Modes

3-6 DSU 56/64 User Manual 61200062L1-1

LOOP ONLY TEST (RT)

The L

OOP

NLY

test or R

EMOTE

OOPBACK

test (RT) is used to test

the loop interface and a major portion of the DTE interface of the

local DSU 56/64 from the remote site over the actual digital data

circuit.

For the L

OOP

NLY

test, the network receive data is looped to the

network transmit data inside the DTE interface section of the DSU

56/64. The physical DTE interface is ignored for this test. The L

OOP

LED flashes during initialization of the test and turns on solid once

the test is in progress. Figure 3-4 illustrates the loopback point and

the signal paths for this test.

Figure 3-4. Loop Only Test Diagram

To initiate the L

OOP

NLY

test, perform the following steps:

1. Press S

ELECT

four times to turn on the L

OOP

test indicator.

2. Press T

EST

while this test indicator is on.

3. To terminate this test, press T

EST

56/64 DSU

DTE

Receive

Interface

DTE

Transmit

Interface

Loop

Transmit

Interface

Loop

Receive

Interface

Loop

Only

DTE or Test

Equipment

Interface

Network

Interface

Loop TX

Loop RX

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