Microsoft KB Archive/98210

= List of Modems/Baud Rates Supported by RAS 1.0 and 1.1 =

Article ID: 98210

Article Last Modified on 10/23/2003

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APPLIES TO


 * Microsoft LAN Manager 2.1 Standard Edition
 * Microsoft LAN Manager 2.1a
 * Microsoft LAN Manager 2.2 Standard Edition
 * Microsoft LAN Manager Remote Access Service 1.0
 * Microsoft LAN Manager Remote Access Service 1.1

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This article was previously published under Q98210



SUMMARY
In Remote Access Service versions 1.0 and 1.1, the most comprehensive list of supported modems and their maximum baud rate with RAS is contained in the MODEMS.INF file that is installed with the RAS program on the RAS client and server computers in the  directory. The RAS &quot;Administrator's Guide&quot; and the README.TXT file (in c:\\RAS directory) both contain only partial listings because they are meant to complement each other.

Below is a comprehensive listing of the supported modems in RAS 1.0 and 1.1.

Note: All modems are external except for the Telebit Internal. The internal versions of external modems are not automatically supported because they may behave differently. Internal modems must provide all the serial port hardware that is otherwise provided by the computer's serial port. This hardware may be non-standard and therefore could cause problems for RAS, but there is a good chance that an internal version of a supported modems works the same. The following listing shows which modems, X.25 network cards, and actual baud rates supported by Microsoft that are supported by RAS 1.0 and/or RAS 1.1. Beside the MAXBAUD= parameter listed beneath some modem and card names there may be important comments about the modem and/or its baud rate capabilities. Only some of the comments are taken directly out of the MODEMS.INF file.

RAS 1.0 does NOT support any X.25 networks, including the Atlantis and Eicon cards.

An asterisk (*) indicates that a modem is NOT supported by RAS 1.0, but it still should work correctly with it.

Please note that the items are not listed completely in alphabetical order, because the listing is an excerpt of the MODEMS.INF file for RAS 1.1 with additional comments (preceded by a number sign [#]). If your modem is NOT listed, refer to the information at the end of this article. #-- [Cardinal_2400E] MAXBAUD = 2400 [ATLANTIS_CARD]* MAXBAUD = 2400 [CODEX_2264] MAXBAUD=9600 [CODEX_3260] MAXBAUD=9600 [Evercom_24] MAXBAUD = 2400 [Evercom_24E] MAXBAUD = 2400 [Evercom_24E+] MAXBAUD = 2400 [Hayes_1200] MAXBAUD = 1200 [Hayes_Smartmodem_2400] MAXBAUD = 2400 [Hayes_Smartmodem_9600] MAXBAUD = 9600 [Hayes_V_Series_9600] MAXBAUD = 9600 [Hayes_Ultra_9600] MAXBAUD = 9600 [Hayes_Ultra_14400] MAXBAUD = 9600 [Intel_9600EX] MAXBAUD = 9600 [MicrocomQX_4232hs] MAXBAUD=9600 [MicroPorte_1042] MAXBAUD=2400 [MultiModem_224] MAXBAUD = 2400 [MultiModem_224E] MAXBAUD = 2400 [Penril_Alliance_V32] MAXBAUD = 9600 [Practical_2400_Pocket] MAXBAUD = 2400 [Practical_2400SA] MAXBAUD = 2400 [Practical_2400SA_MNP] MAXBAUD = 2400 [Practical_9600SA] MAXBAUD = 9600 [Racal-Milgo_3221] MAXBAUD = 9600 [Racal-Milgo_3222] MAXBAUD = 9600 [Racal-Vadic_9642PA] MAXBAUD = 9600 [Telebit_Internal] MAXBAUD = 9600 [Telebit_Trailblazer_Plus] MAXBAUD = 9600 [Telebit_T1000] MAXBAUD = 9600 [Telebit_T1500] MAXBAUD = 9600 [Telebit_T1600] MAXBAUD = 9600 [Telebit_T2000] MAXBAUD = 9600 [Telebit_T2500] MAXBAUD = 9600 [Telebit_T3000] MAXBAUD = 9600 [Telebit_QBlazer] MAXBAUD = 9600 [UDS_V3225] MAXBAUD=9600 [USRobotics_1200] MAXBAUD = 1200 [USRobotics_2400] MAXBAUD = 2400 [USRobotics_Courier_HST] MAXBAUD = 9600 [USRobotics_Courier_Dual] MAXBAUD = 9600 [USRobotics_Courier_V32bis] MAXBAUD = 9600 [ARKDM424_MODEM]* MAXBAUD = 9600 [ATT4000_MODEM]* MAXBAUD = 1200 [ATT4024_MODEM]* MAXBAUD = 2400 [NULL_MODEM_4800] MAXBAUD = 4800 [NULL_MODEM_9600] MAXBAUD = 9600 [NULL_MODEM_19200] MAXBAUD = 19200 [NULL_MODEM_38400] MAXBAUD = 38400 [EICON_CARD]* MAXBAUD = 1200 If your modem is not on the above list, please refer to the RAS 1.1 README.TXT file section &quot;Using Non-Supported Modems.&quot;
 * 1) This is not a modem, but an X.25 network card.
 * 2) Please do not modify the MAXBAUD parameter. The
 * 3) low baud-rate setting does not affect the actual
 * 4) speed of data transmission.
 * 5) The low baud rate assigned to X.25 Remote Access
 * 6) connections causes the Remote Access software's error
 * 7) control to defer to the X.25 network's error control.
 * 8) Setting the MAXBAUD higher will duplicate error control,
 * 9) resulting in unnecessary retransmissions and possible
 * 10) degradation in performance.
 * 1) degradation in performance.
 * 1) Codex modems are manufactured by Motorola, Inc.
 * 1) Evercom modems are manufactured by Everex, Inc.
 * 1) MUST SET DIP SWITCHES CORRECTLY, DTR ON, DCD ON WHEN
 * 2) CARRIER
 * 1) This modem does NOT support v.32 and supports 9600
 * 2) baud only while communicating with modems that support
 * 3) its proprietary protocol (most likely other Hayes modems).
 * 4) If connected to a modem that does NOT support this
 * 5) proprietary protocol then 2400 baud (v.22bis) is usually
 * 6) the maximum baud rate achievable if the other modem
 * 7) supports v. 22bis.
 * 1) This modem is v.32 compatible and supports a modem-to-modem
 * 2) line speed of 9600 baud
 * 1) This modem is v.32bis compatible and therefore supports
 * 2) v.32 (9600 baud) connections with any v.32 modems.
 * 3) This modem has not been tested with MAXBAUD = 19200
 * 4) Note: RAS 1.0 incorrectly stated MAXBAUD = 19200
 * 1) This modem is manufactured by Microcom, Inc
 * 1) This modem is manufactured by Microcom, Inc
 * 1) The MultiModems are manufactured by MultiTech Systems, Inc
 * 1) This modem has not been tested with MAXBAUD = 19200
 * 2) Note: RAS 1.0 incorrectly stated MAXBAUD = 19200
 * 1) All modems with the name &quot;Practical&quot; are manufactured by
 * 2) Practical Peripherals, Inc.
 * 1) This modem has not been tested with MAXBAUD = 19200
 * 2) Note: RAS 1.0 incorrectly stated MAXBAUD = 19200
 * 1) This modem is a product of Motorola
 * 1) This modem does NOT support v.32bis (14,400 modem-to-modem
 * 2) speed). The HST modulation has an asymmetrical
 * 3) data flow: high speed in one direction and 450 bps in
 * 4) the other. The modems switch the fast and slow channels
 * 5) when the volume of data flow changes.
 * 6) This modem has not been tested with MAXBAUD = 19200
 * 7) Note: RAS 1.0 incorrectly stated MAXBAUD = 19200
 * 1) This modem is the &quot;US Robotics HST Dual Standard with
 * 2) v.32bis&quot; support as well. It should be capable of the
 * 3) same baud rate that the US Robotics Courier v.32bis
 * 4) modem below supports. However, Microsoft has not tested
 * 5) this modem at 19200 baud and therefore can NOT guarantee
 * 6) its results.
 * 7) This modem didn't have a section of its own in RAS 1.0,
 * 8) but it was supported.
 * 1) This modem has been tested with a &quot;MAXBAUD = 19200&quot; (on
 * 2) RAS client and server side) to yield a modem to modem
 * 3) connection speed of 14400 bps IF you install a multiport
 * 4) adapter on your remote access server to relieve the main
 * 5) processor of interrupt processing load. If you are using
 * 6) the OS/2 internal serial driver, you can communicate only
 * 7) at 9600 bps.
 * 8) In order to support the 19200 baud rate, replace the
 * 9) existing &quot;COMMAND =&quot; string (server & client) with:
 * 10) &quot;COMMAND=AT&F&C1&D2V1S0=0S2=128 S7=55 &B1 &R2 &K1 &M4 *cr&quot;
 * 11) Note: that spaces are not required on the &quot;COMMAND=&quot; line.
 * 12) Set client workstation WRKHEURISTICS digit 14 to 0
 * 13) (enabling raw I/O) to ensure a smoother data flow when
 * 14) moving big chunks.
 * 15) This modem didn't have a section of its own in RAS 1.0,
 * 16) but it was supported.
 * 1) This modem didn't have a section of its own in RAS 1.0,
 * 2) but it was supported.
 * 1) but it was supported.
 * 1) ---AT&T Paradyne ARK DM 424
 * 1) ---AT&T 4000 Model 1A02---
 * 1) ---AT&T 4024---
 * 1) All NULL_MODEM entries are for null-modem RAS client to
 * 2) RAS server connections.
 * 1) Please do not modify the MAXBAUD parameter. The low baud
 * 2) rate setting does not affect the actual data transmission speed.
 * 3) The low baud rate assigned to X.25 Remote Access
 * 4) connections causes the Remote Access software's error
 * 5) control to defer to the X.25 network's error control.
 * 6) Setting the MAXBAUD higher duplicates error control,
 * 7) resulting in unnecessary retransmissions and possible
 * 8) degradation in performance.
 * 1) degradation in performance.

If you want your listed or unlisted modem to achieve a higher baud rate than supported by RAS 1.x (RAS 1.x generally only supports v.32 9600 baud connections with one exception) please refer to these RAS 1.1 README.TXT file sections:


 * &quot;Error Control and Compression&quot;
 * &quot;Things to Check for Before Enabling Error Control and/or Compression&quot;
 * &quot;Enabling Modem Error Correction and/or Compression&quot;

If you need to modify lines other than &quot;MAXBAUD=&quot; we also recommend following the instructions in the RAS 1.1 Administrator's Guide, Appendix A, pg. 90, &quot;Adding a New Modem to MODEMS.INF&quot;.

Additional query words: 2.10 2.1 2.10a 2.1a 2.20 2.2

Keywords: kbnetwork KB98210

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