ADTRAN Network Router DSU 56 Manual do Utilizador descarregar pdf (Página 37)

Chapter 3. Test Modes

61200062L1-1 DSU 56/64 User Manual 3-9

REMOTE TESTS

The DSU 56/64 responds to three remotely activated tests.

• Remote Digital Loopback (RDL)

•CSU Loopback (LL)

• DSU Loopback (RT)

The RDL test is initiated by a remote DSU and causes the local DSU

56/64 to loopback. The loopback point is the same as the loop only

point. See Figure 3-4 on page 3-6. This test is run to test the end-to-

end performance of the circuit.

Both the CSU L

OOPBACK

and the DSU L

OOPBACK

tests are

activated from the telephone company diagnostic test equipment

and are used to isolate trouble on a circuit.

The CSU L

OOPBACK

, commonly called the LL test, has the same

loopback points as the DTE

AND

OOP

test. It is used by the

telephone company to test the integrity of the local loop.

The DSU L

OOPBACK

, commonly called the RT test, has the same

loopback point as the L

OOP

NLY

test and is used by the telephone

company to test the operation of both the local loop and DTE

interface sections.

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ADTRAN Network Router DSU 56 Manual do Utilizador Página 37