Multi-tech-systems MT2834BLR Manuel d'utilisateur télécharger pdf (Page 61)

Chapter 5 - Testing the Modem

5.4 Local Analog Loopback Test (Synchronous Mode)

To initiate the Local Analog Loopback Test, with the modem in

Synchronous mode:

1. Enter AT&M1U. This first switches your modem from asynchronous to

synchronous mode, and places it into the Analog Loopback/Originate

mode. The modem is now out of the Command mode and in the

pseudo On-Line mode.

2. Once you receive a connect message (if responses are enabled), enter

data from your keyboard. For this test, typing multiple upper case "U"

characters is a good way to send an alternating test pattern of ones and

zeros.

3. For a more complete test, you should also test the modem in Answer

mode. To do this, pull out and then reinsert modem card in rack cage.

Then type AT&M1U1 and hit ENTER to place the modem in Analog

Loopback mode, in the Answer mode. Then repeat step 2.

Figure 5-4. Local Analog Loopback Test (Syncronous Mode)

Digital

Analog

Computer or Terminal

Local MultiModem

UUUU

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Multi-tech-systems MT2834BLR Manuel d'utilisateur Page 61