ADTRAN T3SU 300, User Manual

Page: 100 / 145

Chapter 6. Diagnostics
100 T3SU 300 User Manual 61202217L1-1B
Figure 6-8. DTE Loopback Test
Payload and DTE Loopback
Select this test to perform payload and DTE loopbacks
simultaneously. The individual tests are described on page 95 and
page 99. See Figure 6-9 for a block diagram illustrating this test.
Figure 6-9. Payload and DTE Loopback Test
Remote Port Payload Loopback
This selection initiates a Payload Loopback on the remote T3SU 300
for all data on the selected port. Perform this test to verify the
integrity of the portion of the DS3 link connecting the local DTE
and the selected port of the remote T3SU 300. All other ports on
both the local and remote units are unaffected.
Remote Payload Loopback with BERT
Perform this test to verify the integrity of the link between the
selected port of the local T3SU 300 and the corresponding remote
T3SU 300 port. During this test, the remote unit loops back all data
for the selected port, while the local unit sends and checks the
selected BERT pattern. The loopback point and the signal paths for
DTE
MUX
T3SU 300
DTE
MUX
T3SU 300