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7.9
Sync Data Channel Testing
The Sync Data Channel Loopback test is used when the MultiMux has configured Port B for the sync data mode. This
test simulates a modem or DSU in sync loopback mode. To use this test, configure the synchronous device for
loopback test in which port B loops the data back to the synchronous device.
Table 7-7. Sync Data Channel Testing Procedure
Step Procedure
1 Before the Sync Data Channel Loopback test is run, port B of the MultiMux has to be set for the sync data mode
using the $MUXBSYNC command.
2 Place the local MultiMux unit in Test Mode 13 (i.e., executing the Sync Data Channel Loopback test) by entering
the following command.
AT&T13 (hit Return)
The supervisory console will display the following message:
AT THIS POINT IN TIME, ANY SYNC DATA
RX'D BY THE MUX IS LOOPED BACK OUT
AND TX'D BY THE MUX.
4 When you have verified that the Sync Data Channel is operating correctly, enter the following to end the test:
ATZ (hit Return)
or
AT&T0 (hit Return)