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Chapter 6: Modem Guide
6-18 CSMIM-T1 Hardware Installation Guide
6.6.5 Remote Digital Loopback
Remote Digital Loopback tests the remote modem port, the telephone
line, the local serial and modem ports, and the local computer. This test
requires you to type a sequence of characters at your computer. The
modem then sends these characters to the remote modem, which echoes
them back to your modem.
Initiate a Remote Digital Loopback by using the &T6 command.
Using Commands to Perform a Remote Digital Loopback
To initiate a Remote Digital Loopback:
1. Dial the number of a remote system configured to accept a Remote
Digital Loopback request.
2. When the modems connect, return to the command state and type:
B <Enter>.
3. Type a sequence of characters.
The characters echoed on your display should match exactly the
characters you typed. The test continues for the time set with register S18,
or until you manually terminate the test. To manually end the test, enter
command state and type: AT&T0 <Enter>
.
To end the test and hang up, type: ATH <Enter>
6.6.6 Local Digital Loopback
Local Digital Loopback allows the modem to loop back data to the remote
modem. It tests the remote computer, the remote modem and serial ports,
the telephone line, and the local modem port. You initiate a Local Digital
Loopback by using the &T3 command.
Using Commands to Perform a Local Digital Loopback
To initiate a Local Digital Loopback:
1. Dial the number of a remote system.
2. When the modems connect, return to the command state and type:
AT&T3 <Enter>.