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COMSPHERE 6800 Series Network Management System
2-176 January 1997 6800-A2-GB31-20
Loopback (lo)
(Disruptive to the Diagnostic Channel of COMSPHERE Devices)
Use the lo command to place a device into one of four loopback states, or to release a device from
the specified loopback state. This command can be directed to all COMSPHERE and
DATAPHONE II devices.
The four types of loopback states are analog/local, digital, DTE, and V54-Remote-Digital.
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: lo
Alternate: lpbk
Restrictions: Remote DATAPHONE II DDD modems cannot be placed into the
loopback state with this command. Use the Remote Digital Loopback (rdl)
command to place a remote DATAPHONE II DDD modem in or out of the
loopback state.
Routine: Yes
Schedule: Yes
Related Commands: Remote Digital Loopback (rdl)
Loopback Test Input Form
This input form contains the following fields:
Device(s) (Required field)
Enter the device(s) to which this command will be sent. 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.
Test type or state (Required field)
Enter the desired loopback state:
analog/local
This test loops back the analog signal from the transmitter to the receiver. The
test duration for 3400/4400 Series modems is fixed at 30 seconds.
For the 3600 Series DSUs, the loopback permits the DTE to run a test to
determine whether the DTE connection to the DSU is functioning properly. The
DTE sends a test to the DSU which loops the test back to the DTE. For
3900 Series modems, analog/local loopback is not supported on tributary
modems.