Local Loopback Test - Avaya 6424D+M User Manual

Chapter 6: Test Descriptions
Page 6-2

LOCAL LOOPBACK TEST

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
FIGURE 6-2
Local Loopback Test
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.
DEFINITY
High Speed Link
Transmitter
Receiver
Communications System
DEFINITY High Speed Link
User´s Guide
S
W
I
T
C
H