Table of Contents
Advertisement
GENERAL
Diagnostic tests are used to isolate faults in the communications path.
Diagnostic tests will terminate after the period of time specified by S18.
If S18 is set to 0, the timer is disabled and tests will run continuously.
Tests may also be terminated by the &T command. When in test modes
without test pattern, issue the escape sequence +++ to return to
command mode before terminating the test with the &T command.
Note
Local analog loopback with or without test pattern is the
only test available in protocol mode.
Test Categories
Diagnostic tests fall into two categories: those with test patterns and
those without. Refer to Table 7-1.
Table 7-1. Test Operating Mode Requirements
Test
LAL (Local Analog Loopback)
LAL/TP (Local Analog Loopback
with Self Test)
LDL (Local Digital Loopback)
RDL (Remote Digital Loopback)
RDL/TP (Remote Digital Loopback
with Self Test)
TP (Test pattern)
Note
These tests do not apply to fax mode and should only be
performed when the modem is configured for data opera-
tion.
Test Mode Operation
Offline
X
X
V.3400
Chapter 7
Online
X
X
X
X
X
X
7-1
Advertisement
Table of Contents
