0049-2702-XXX Alliance Series Modems – USER MANUAL
08/05/2010
Rev. A
Page 151 of 197
Remote Modem Diagnostics
The ALX is capable of performing two sets on compatible remote modems: remote digital
loopback (RDL) and remote digital loopback self test (RDLST). If a problem is encountered and
the local ALX passes all diagnostic tests, the local ALX can test the remote modem.
There are two (noncontiguous) REMOTE TEST screens on the ALX LCD:
(1)
The remote tests are
initiated
from the REMOTE TEST
menu
. (Select RMT from MAIN
MENU screen 2, and then select TEST. Then select the test type.)
(2)
A remote test cannot be initiated unless the Remote Test option is enabled on the
remote modem.
This option (also REMOTE TEST on the LCD) is accessed via SETUP
screen 4.
Remote Digital Loopback (RDL) Test
The RDL test (Figure 6-6) tests the local modem, remote modem and telephone line from the
local site.
For this test, both modems should be on-line. Ensure that the DTR circuit is on. (If TR is
present on the TIA/EIA status screen, the DTR circuit is on.)
Figure 6-6. Remote digital loopback (RDL) test
Note
(V.34 models only): When the Asymmetric Data Rates option is enabled, the RDL test is
disabled.
Hayes Mode (&T6)
Initiate the remote digital loopback test by entering the command
AT &T6
. Then, check for
proper operation of the modems and phone lines by transmitting test data and comparing it with
the received test data.