Avaya 6211 Mode D'Emploi

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This test can only be initiated from the front panel interface.  You
cannot send or receive data during this test.

The remote loopback with self-test determines the quality of the
data transmission channel and the proper operation of the HSL at
the local endpoint.

The HSL supports two optional protocols for putting a remote
endpoint in the data loopback mode —AT&T and V.54 protocol.
The protocol selected must be the same as the protocol used at the
remote endpoint.  In addition to matching protocols, the
REQUEST TO SEND input lead on the V.35 interface must be ON
if your HSL is optioned for 56KBPS, HALF DUPLEX operation,
and the DATA INVERT option must be set to OFF if your HSL is
optioned for 64KBPS operation.

Once a call has been established and you initiate the test, the HSL
generates a test message and transmits it to the remote endpoint
where it is looped back to the HSL.  The HSL then compares the
received message with the transmitted message for errors.

Transmitter

Test Circuit

High Speed Link

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Receiver

Remote

Data Endpoint

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DTE

Local

DTE

Receiver

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This test should be conducted when data errors are detected and
the local DTE cannot send and check the returned data for errors.
Passing this test indicates that the problem is most likely in the
DTE equipment or the interface to the DTE equipment.  Since the
network problems can cause errors, this test should be run while
on the call where errors were detected.