Avaya 6211 사용자 가이드

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The local loopback test can be initiated by the front panel
interface, the V.35 local loopback interface lead, or a command
from the switch.

The HSL provides a local loopback test that accepts synchronous
data on its input data lead and retransmits the data synchronously
on its output data lead.  If this test is activated during a normal
call, the call will be disconnected.  The call will not be
disconnected if the permanent connection option is set to YES.

In the local loopback test, data is sent from the local data terminal
equipment on a loop through the HSL on the local side of the
switch; the switch and remote endpoint are excluded from this
test.

Local DTE

Data Sent

Data Received

Transmitter

Receiver

High Speed Link

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C
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This test should be conducted when the received data contains
errors. Passing this test indicates that the local DTE, the interface
cable, and the HSL data circuits are working properly.