Allied Telesis AT-S99 - Manual (Page 51)

AT-S73 and AT-S99 Management Software User’s Guide
51
OAM Loopback
Tests
OAM loopback tests are used to test the quality of the fiber optic
connection that serves as the link between two AT-CM Line Cards or
between an AT-CM Line Card and another OAM-compliant device. Test
packets are exchanged by the line cards over the fiber optic link on Port A.
The test packets are generated by the local line card in the Converteon
chassis that has the AT-CV5M02 Management Card. The remote line card
returns the test packets over the same fiber optic connection. As the local
line card receives its original test packets, it checks for lost packets and for
packets with errors, and displays the results in statistics counters.
Figure 6 illustrates a loopback test between two AT-CM Line Cards. The
test packets are generated by the line card in the AT-CV5000 Chassis at
the central office and are returned by the line card in the AT-CV1000
Chassis at a remote site.
Figure 6. Loopback Test
For instructions, refer to “Performing an OAM Loopback Test” on
page 209.
Caution
The loopback test is disruptive to network operations. Local and
remote line cards do not forward network traffic during the test.
Some network traffic may be lost.
FAN1
PS1
RDY
A T -CV5000
AT-CM Line Card in
Remote AT-CV1000
Chassis
AT-CM Line Card
AT-CV5000 Chassis
and AT-CV5M02
Management Card
Test Packets