Avaya 6211 Guia Do Utilizador

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The data loopback test is initiated by the front panel interface, a
command from the switch, a remote data endpoint using the
AT&T or V.54 protocol, or a network test center.  You must be on
a data call to run a data loopback test.  Note, when the data
loopback test is initiated by a remote data endpoint, the protocol
used must be the same as the protocol used by the remote
endpoint.  In addition, 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.

The data loopback test is a test that aids the remote user.  It
excludes the local V.35 interface and local data terminal
equipment.  The remote equipment sends a test message that is
received at the local HSL and is looped back to the remote
endpoint for verification that the data endpoints and telephone
line are operating properly.  (See also the Remote Loopback Test
section later in this chapter.)

High Speed Link

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Data Received

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Transmitter

Receiver

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This test should be conducted when data errors are detected and
when remote testing of the HSL and network is desired. Passing
the test indicates that the problem is most likely in the local DTE
or the interface to the local DTE.