ADTRAN Network Router DSU 56 Instrukcja Użytkownika Pobierz pdf (Strona 30)

Chapter 3. Test Modes

3-2 DSU 56/64 User Manual 61200062L1-1

If an E

PROM

HECKSUM

failure is detected during self test, CS,

ALM, PTRN, and E

RROR

indicators all flash at the end of the self

test.

NEAR END TESTS

The local DSU 56/64 can perform the following near end tests:

•DTE Only

• DTE with Test Pattern

• DTE and LOOP (LL)

• Loop Only (RT)

DTE ONLY TEST

The DTE O

NLY

test can test both the DTE interface of the local DSU

56/64 plus its loop transmitter and receiver. For this test, the loop

transmit data is connected to the loop receive data at a point close

to the physical network interface.

The loopback point and the signal paths for this test are shown in

Figure 3-1.

Figure 3-1. DTE Only Test Diagram

56/64 DSU

DTE

Receive

Interface

DTE

Transmit

Interface

Loop

Transmit

Interface

Loop

Receive

Interface

DTE

Only

DTE or Test

Equipment

Interface

Network

Interface

Loop TX

Loop RX

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