7
7511-A2-GN10-10
January 1999
Table 1.
Configuration Options (5 of 5)
Switch
Options and Usage
Default in Bold
DSR
S2-5 (DSU A)
S4-5 (DSU B)
S1
S2
S3
S4
DSU A
DSU B
ON
ON
ON
ON
Determines the operation of interchange circuit CT107, Data Set Ready
(DSR).
Off
Standard
DSR is always on, except when an alarm is detected or a test is active.
ON
Forced On
DSR is forced on after a successful self-test.
511 Test
Pattern
Generation
and
Monitoring
S2-6 (DSU A)
S4-6 (DSU B)
S1
S2
S3
S4
DSU A
DSU B
ON
ON
ON
ON
Determines whether the DSU will generate and monitor a 511 test
pattern in remote loopback tests.
Off
Enable
A 511 pattern is generated and monitored during the remote loopback
test.
ON
Disable
A 511 pattern is not generated. External test equipment is required to
perform a Bit Error Rate test.
CT141
S5-1 (DSU A)
S5-3 (DSU B)
S5
DSU A
DSU B
ON
Determines whether a local digital loopback can be controlled by the
DTE using interchange circuit CT141, Local Loopback (LL). If enabled,
the DTE port remains in loopback while LL is on.
Off
Disable
The DSU will not initiate the loopback on command from the DTE.
ON
Enable
The DSU initiates the loopback.
CT140
S5-2 (DSU A)
S5-4 (DSU B)
S5
DSU A
DSU B
ON
Determines whether a remote digital loopback can be controlled by the
DTE using interchange circuit CT140, Remote Loopback (RL). If
enabled, the remote DSU must be able to detect the in-band V.54
loopback sequence.
Off
Disable
The DSU will not initiate the loopback on command from the DTE.
ON
Enable
The DSU initiates the loopback.
