Black Box LRA005A-R2, LRS002A-R2, LRA001A-R2 manual AT Return

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL

C.3.8 MODEM WILL NOT CONNECT TO REMOTE MODEM

Possible causes—There are a variety of possible causes. Use this procedure to determine the most likely cause:

•the telephone circuit is overloaded

•the remote telephone number is not correct

•the local telephone circuit is faulty

•the remote modem is not compatible with Router’s modem

Suggestions—Sometimes it is useful to go through the connection procedure manually and study the modem’s output.

We strongly suggest that the Router always be used on a dedicated telephone line. If you are using the Router to make only outgoing calls to a network service provider (who will never call you), we recommend not sharing the line with other equipment, such as a fax-modem or a telephone. In order to reliably maintain the high data rates of the Router’s built-in modem, other such equipment should only put a minimal electrical load on the telephone circuit. When having a problem with the modem connection, remove all other equipment from the line and make all telephone cords as short as possible. Sometimes a long telephone cord can act like an antenna and pick up noise.

To make sure that the remote number is being called correctly, turn the modem’s speaker on with the command:

dialup modemX volume high

and listen as you type the command:

update modemX now

which should force the Router to make a call. If the remote number is good, you will hear the remote end ring, get answered, a whistle, and finally the rushing noise of the modem training sequence. If you don’t hear these sounds, contact the remote site to make sure that you have the right telephone number, and that their equipment is ready to accept calls.

If all of these preliminary checks pass, but the modem still will not connect, try operating the modem manually.

1. Stop the dialer process. Enter:

dialup modem0 inactive

2. Connect to the modem. Enter:

tip modem0 <RETURN>

3. Make sure that the modem responds to commands. Enter:

AT <RETURN>

This should generate the “OK” response.

4. Turn the modem speaker on. Enter:

ATM1L3 <RETURN>

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