Extreme Networks Alpine 3804 Manual

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
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)
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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

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.

Verified Modem Init Strings
Dynalink Model 1456ER2
The string is: AT&F&C1S37=9S0=2Q1&D0&W
&F – Restore to factory default
&C1 – Carrier detect set to normal
S37=9 – Other than PC connection
S0=2 – Auto answer after 2 rings
&D0 – DTR ignored. Allows operation with DTE that does not provide DTR.
&W – Write config to memory
Hayes Accura 56K Model 4703US
The string is: AT&C1&D0&K4S0=1&W
&C1 – Carrier detect set to normal
&D0 – DTR ignored. Allows operation with DTE that does not provide DTR.
&K4 – Use XON/XOFF flow control
S0=1 – Auto answer after 1 ring
&W – Write config to memory
US Robotics Courier V.Everything 33.6/28.8
The string is: AT&F2&C1&D0S0=1&W
&F2 – Load Software Flow Control template settings
&C1 – Carrier detect set to normal
&D0 – DTR ignored. Allows operation with DTE that does not provide DTR.
S0=1 – Auto answer after 1 ring
&W – Write config to memory
Dip Switch Settings
Dip Position Purpose
1 ON DTR Always On
2 OFF Verbal Result Codes
3 OFF Suppress Result Codes
4 OFF Echo Offline Commands
5 OFF Auto Answer ON RING
6 OFF NORMAL CARRIER DETECT
7 OFF DISPLAY ALL RESULT CODES
8 ON ENABLE AT COMMAND SET
9 ON NO DISCONNECT WITH +++
10 OFF LOAD NVRAM DEFAULTS
Contact your Extreme Technical Support representative and record the dial-in number for the analog line.

Contacting the ExtremeWorks Technical Assistance Center (TAC)
For additional assistance, please contact your local ExtremeWorks TAC.
Americas TAC (Corporate TAC)
Web site: www.extremenetworks.com/support/techsupport.asp
E-mail: [e-mail]
Toll free: 1-800-998-2408
Direct phone: [phone]
3585 Monroe Street
Santa Clara, CA 95051
EMEA (Europe, Middle East & Asia) TAC
E-mail: [e-mail]
Direct phone: [phone]
Kernkade 2
Lageweide Ind. Park
3542 CH Utrecht
The Netherlands
Japan TAC
E-mail: [e-mail]
Direct phone: [phone]
17F Sumitomo Korakuen Building
1-4-1 Koishikawa
Bunkyo-ku, Tokyo 112-002, Japan
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© 2001 Extreme Networks, Inc. All rights reserved. Extreme Networks, BlackDiamond, Ethernet Everywhere, Extreme Ethernet Everywhere, ExtremeWare,
Summit, ServiceWatch and the color purple are registered trademarks of Extreme Networks, Inc. in certain jurisdictions. Alpine, Alpine 3804, Alpine 3808,
BlackDiamond 6808, BlackDiamond 6816, Extreme Standby Router Protocol, ESRP, Summit1i, Summit5i, Summit7i, Summit24, Summit48, Summit48i,
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Networks logo are trademarks of Extreme Networks, Inc., which may be registered or pending registration in certain jurisdictions. Extreme Turbodrive, the
Extreme Turbodrive logo, ExtremeWorks, ExtremeWorks Professional Services and Go Purple are service marks of Extreme Networks, Inc., which may be
registered or pending registration in certain jurisdictions. All other registered trademarks, trademarks and service marks are property of their respective
owners. Specifications are subject to change without notice. L-UG-MSC-111 Rev. November 2001
www.extremenetworks.com
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