Cabletron Systems CSMIM-T1 manual Local Analog Loopback, Remote Digital Loopback with Self-Test

Diagnostics

6.6.3Local Analog Loopback

Local Analog Loopback tests the local serial port and the local computer. This test requires you to type a sequence of characters at your computer. The modem then sends these characters back to your computer. You initiate a Local Analog Loopback test by using the &T1 command.

Using Commands to Perform a Local Analog Loopback

To initiate a Local Analog Loopback:

1.Type: AT&T1<Enter> (must be the last command on the line).

2.Type a sequence of characters.

The characters on your display should match exactly the characters you type. This test mode 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>.

6.6.4Remote Digital Loopback with Self-Test

Remote Digital Loopback with Self-Test tests the remote modem port, the telephone line, and the local serial and modem ports. When the modem is set to Remote Digital Loopback with Self-Test, it sends the remote modem a special test data sequence, and the remote modem echoes this data back to your modem.

To initiate a Remote Digital Loopback with Self-Test:

1.Dial the number of a remote system configured to accept a Remote Digital Loopback request.

2.When the modems connect, return to command state and type: AT&T7 <Enter>.

When the test is complete, the screen displays a 3-digit number that represents the number of errors. For example:

AT&T7

(no display during test)

000 OK

The test continues for the time set with register S18 or until you terminate the test by typing AT&T0 <Enter>, or ATH <Enter> to end the test and hang up.

CSMIM-T1 Hardware Installation Guide 6-17