Extreme Networks Alpine 3808, Summit Summit1i, BlackDiamond 6808, BlackDiamond 6816, Summit Summit24 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

Remote Dial-up Connection

Laptop Computer

Warning

AC Power Supply

US Robotics 33.6 External Faxmodem model 839

RJ-11 Telephone

Patch Cable

or Hayes Accura 336 Fax Modem

– When attempting to connect a modem to a BlackDiamond MSM console port, make sure to plug the

9-pin Male-to-

25-pin Female

Serial Cable

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)

Depending on what type of modem you have, it may be necessary to lock down the DTE speed to 9600. Some
modems require a special AT command or dipswitch setting to lock the DTE speed. Check the manual for
your modem.

US Robotics 33.6 external fax/modem model 839
Modem-specific configuration parameters:

• Connect modem to PC/laptop, launch terminal session.

• Enter the following command string (fixes serial port speed and writes new config to default memory
location): AT&B1&W

• Turn off and disconnect the modem.

• Change the dip switches to the following:
1 – Down* DTR override
2 – Up Verbal result codes
3 – Up Suppress result codes
4 – Down No echo, offline commands
5 – Up Auto answer on first ring
6 – Up Carrier detect normal
7 – Down Load NVRAM defaults
8 – Up Dumb mode
*Down correlates to the underside of the modem chassis. Up correlates to the top of the chassis.

• Reconnect equipment according to the diagram above.

Hayes Accura 336 fax/modem

Modem-specific configuration parameters:

• Connect modem to PC/laptop, launch terminal session.

• Enter the first command string: AT&F&C1&D0S37=9S0=1&W

Parameter Explanation

&F – Clear previous configuration by setting modem to factory default
&C1 – Normal CD Operations
&D0 – DTR Over-ride
S37=9
S0=1 – Set auto answer to first ring
&W – Write configuration to memory

• Enter the second command string: ATQ1&W

Parameter Explanation

Q1 – Suppress Result Codes
&W – Write additional parameter to memory

• Turn off and disconnect the modem.
– Reconnect equipment according to the diagram above.