User manual

Chapter 7. Test Menu
7-10 TDU 120e User Manual 61202156L1-1
511 PATTRN
Activates the generation of the 511 test pattern.
ON
The pattern check circuitry is enabled and a test started. The
test is ended by selecting OFF.
OFF
The pattern generation and check is disabled.
511 RESULTS
Displays the results of the 511 test indicated in the 511 option.
The results are in the form of the number of errored seconds.
The error count can be cleared by pressing C.
DBU LOOPBACK
ON
Initiates a loopback from the DBU towards the external DCE.
OFF
Terminates the loopback test.
DBU TEST
This selection is used to force a backup to occur even if a
backup condition does not exist.
TEST OFF
Turns off DBU tests.
FORCED BACKUP
Forces a backup regardless of time-of-day lockouts or net-
work conditions.
INTERFACE TST
Causes the external DCE to dial its stored number. After the
connection is established, the DBU sends a test pattern to ver-
ify the backup network. This test does not disrupt data or the
primary network.