Extreme Networks Alpine 3804 Supplementary Manual

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Modem String Configuration for Remote Access

This document is intended to provide the necessary steps for adding a modem for remote access.

Required Equipment:

• Modem
• Modem power supply
• RJ-11 phone patch cable
• 9-pin male-to-25-pin female serial cable
• Analog phone line
• AC power source

Generic Hardware Configuration

AC Power Supply
US Robotics 33.6 External Faxmodem model 839
Warning – When attempting to connect a modem to a BlackDiamond MSM console port, make sure to plug the
external modem into the console port not the modem port. The MSM modem port does not function with
external modems attached.
Connection to the console port is used for direct local management. The console port
Settings are configured as follows:
• Baud Rate: 9600
• Data Bits: 8
• Stop Bit: 1
• Parity: None
• Flow Control: XON/XOFF
For best results, an AT initialization string should be customized for the modem. This can be obtained from the
modem documentation or the modem manufacturer.
The modem must be attached to the Extreme box to do the following:
• Raise DCD (Data Carrier Detect) when a call comes in (typically &C1)
• Ignore DTR/DTR Override (typically &D0)
• Use XON/XOFF software flow control (typically &K2 or &K4. &F2 on some USRs)
• Answer on the first ring (typically S0=1)
Remote Dial-up Connection
RJ-11 Telephone
9-pin Male-to-
Patch Cable
25-pin Female
or Hayes Accura 336 Fax Modem
Laptop Computer
Serial Cable