Cabletron Systems 9A000 manual Modem Configuration, Modem Parameters, 4-13, Switch Setup

Switch Setup

4.8Modem Configuration

All Cabletron ATM switches support modem access. This may be useful if a switch is installed in a remote location where direct, physical access to the switch is not possible or practical. Keep the following in mind when using a modem to access a Cabletron ATM switch:

•To allow the Cabletron ATM switch to communicate with the modem, a Null-Modem Adapter must be installed on the factory-supplied serial cable.

•The Cabletron ATM switch will not disconnect an ATM Management Interface (AMI) session on loss-of-carrier; therefore, you must ensure that you have completely exited from an open AMI session before disconnecting the modem session.

To allow a modem to work with a Cabletron ATM switch, you must complete two sets of configurations. First, the speed of the serial port on the Cabletron ATM switch must be set to match that of the attached modem and, second, the modem parameters must be configured correctly.

4.8.1Modem Parameters

You should use a Hayes-compatible modem, as the configuration parameters supplied here are applicable to this type of modem. The following parameters should be applied to your Hayes-compatible modem to allow it to function properly with the switch’s serial port. You may attach a tty device to the modem to set these parameters.

Setting	Comment
ATE0	Turn off Echoing
ATQ1	No Return Codes
AT&C0	Force Carrier Detect (CD) High
AT&D0	Ignore Data Terminal Ready (DTR)
AT&W	Save Modem Configuration

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