Motorola and V.32bis - Manual (Page 120)

6-10 Troubleshooting Guide
T
roubleshooting
326X Series Modem Diagnostic Tests
The modem supports loopback, busy out, and retrain tests to assist you in isolating
network problems. These tests analyze the telephone line and the local and remote
modem’s performance. These tests can be initiated from the modem’s front panel,
using AT commands from an attached PC or terminal, or from a network
management system.
The following table shows the AT commands to initiate and terminate tests. The
steps following the table describe how to initiate and terminate each test from the
front panel. (Refer to your network management system documentation for
instructions on initiating and terminating tests from the network management
system.)
IMPORTANT: The tests described in this section cannot be run simultaneously.
Because each test interrupts data flow in a network, notify equipment users at both
the local and remote sites before starting tests.
For details on tests, refer to Chapter 4 of the 326X Series Modem Reference Guide.
Test Description
AT
Command
Local Analog
Loopback Tests the local modem’s transmit and receive circuits
by looping local DTE data from the modem’s
transmitter to its receiver. &T1
Local Analog
Loopback Pattern Tests the local modem’s transmit and receive circuits
with an internally generated test pattern. &T8
Remote Digital
Loopback Using local DTE data, this test examines the transmit
and receive circuits of the local and remote modems
and the telephone line. &T6
Remote Digital
Loopback Pattern Tests the transmit and receive circuits of the local and
remote modems and the telephone line. &T7
Data Mode Pattern The modem uses internally generated test patterns to
provide data and separately test the inbound and
outbound halves of the transmission path.
Not
applicable
Local Digital
Loopback Using the remote DTE data for the test, the telephone
lines and the remote modem circuits are tested. &T3
Busy Out Allows the modem to appear busy to incoming calls. H1
Retrain Lets you manually retrain local and remote modems. O1
(Terminate) Terminates any test in progress. &T0