Lantronix MSS100, 1-T2 manual Modem Configuration Checklist

Troubleshooting Modem Configuration Checklist

B.5 Modem Configuration Checklist

Most modem problems are caused by cabling mistakes or incorrect modem conÞguration. However, the following items should be veriÞed after any modem conÞguration, and re-checked when there is modem trouble.

¥The modem must disconnect immediately when DTR is de-asserted.

¥The modem must assert CD (or DSR, if connected) when connected to another modem. It must not assert CD when disconnected. The modem may optionally assert CD during outbound dialing.

¥The modem and MSS must agree on the ßow control method and baud rate scheme.

¥The modem must not send result codes or messages to the server except optionally during outgoing calls.

¥The modem should be set to restore its conÞguration from non- volatile memory when DTR is dropped.

¥The modem should be conÞgured to answer the phone if incoming connections are to be supported. Generally this is done with the ats0=1 command.

¥The modem should not be conÞgured to answer the phone unless the MSS asserts DTR.

¥MSS Modem control must be enabled. Using modems on ports without modem control enabled will lead to security problems.

The MSS Autobaud feature should be enabled only when required.

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