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2Modem/DSU Commands
2-2076800-A2-GB31-20 January 1997
Transmit Test Pattern (ttp)
(Disruptive)
Use the ttp command to turn on or off the test pattern generator in a DATAPHONE II or
COMSPHERE 3600 Series DSU. If the generator is turned on, either at a control or tributary DSU,
a test pattern is sent over the transmission path to the corresponding DSU.
For most commands, NMS enables you to specify the destination for the command’s results and
schedule its execution. If the last page of the input form cannot accommodate the Destination for
results and Schedule execution fields, an additional page is provided. For a complete description
of these fields, refer to Chapter 1, Introduction.
Access Level: Data Technician, Manager, System Administrator
Abbreviation: Abbreviation: ttp
Restrictions: For a DATAPHONE II DSU to receive the test pattern successfully, a DSU
must be manually addressed at the Shared Diagnostic Unit and the test
pattern generator must be turned on. This allows end-to-end tests to be
conducted to isolate marginal trouble in either the send or receive direction
of the digital path. The results of this test are displayed on the Shared
Diagnostic Unit’s liquid crystal display.
For a 3600 Series DSU or an associated V.32 DBM to receive the test
pattern successfully, the remote DSU or DBM must be in digital loopback.
This directs the bit pattern back to the originating device where it is
checked for errors. These errors are displayed on the front panel of the
DSU. The results of this test can be displayed at the NMS by executing the
Modem Bit Error Rate (mbert) command.
Routine: Yes
Schedule: Yes
Related Commands: None
Transmit Test Pattern Input Form
This input form contains the following fields:
Device(s) (Required field)
Enter the device(s) whose test pattern generator will be turned on or off. One or more
devices may be specified. Standard addressing format applies to the input. For
information on device addressing, refer to Appendix D of the COMSPHERE 6800 Series
Network Management System User’s/System Administrator’s Guide.
Device state (Required field)
Enter transmit to transmit the test pattern. The test pattern will be transmitted until you
execute the ttp command again using the release option or until you execute the Abort
(abort) command.
Enter release to stop transmitting.