Extreme 3804 补充手册

Modem String Configuration for Remote Access

This document is intended to provide the necessar y 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

Warning – When attempting to connect a modem to a BlackDiamond MSM console por t, make sure to plug the 

external modem into the console por t not the modem por t. The MSM modem por t does not function with 

external modems attached.

Connection to the console por t is used for direct local management. The console por t

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) 

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Laptop Computer

US Robotics 33.6 External Faxmodem model 839

or Hayes Accura 336 Fax Modem

AC Power Supply

RJ-11 Telephone

Patch Cable

9-pin Male-to-

25-pin Female

Serial Cable

Remote Dial-up Connection