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2Modem/DSU Commands
2-1776800-A2-GB31-20 January 1997
NOTE
Aborting a Local Loopback from NMS on a tributary DSU requires
using the tributary’s internal DBM. A standby call must be
established to the tributary to provide a path for the diagnostic
information; since the tributary is in local loopback, it is no longer
monitoring the DDS line. Since the only way to release a local
loopback is through the DBM, the DSU will not go into local
loopback unless a DBM is installed in the unit.
digital
This test loops back the received data path to the transmit data path at the digital
interface internal to the modem.
DTE
This test is applicable only for 3400/4400 Series modems and 3600 Series DSUs
equipped with TDMs.
For 3400/4400 Series modems, this test loops back the digital interface towards
the DTE. The DTE transmit data lead is looped to the DTE receive data lead.
For 3600 Series DSUs, this test enables you to loop back the data path at the
DTE/DCE interface on a per-port basis without affecting the operation of the
remaining ports.
V54-remote-digital
This entry identifies the CCITT standard method for enabling a control modem
to use the primary data channel to place a generic tributary modem
(V.54-compatible device) into a digital loopback state. For 3900 Series modems,
this option is not supported.
release
This entry releases the device from a loopback state.
Port number (Required field)
Specify the port from which the test will be initiated.
For 3400/4400 Series modems in digital or DTE loopback state, valid entries are from 1
through 4.
For 3600 Series DSUs, valid entries are from 1 through 6, or a for aggregate (to loopback
at the DSU instead of at the port).
For 3800/3900 Series modems, the only valid port number is 1.
For DATAPHONE II devices, the only valid port number is 1.
This test will disrupt the data transmission only on the specified port.
A pop-up menu is available listing valid selections. The default is 1.