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- -----------------------------------------------------------------------
- CURENT MODEM CODE DATES
-
- IM14400-0* 00 NOV 22, 1991
-
- SA14400-01 00 NOV 22, 1991
-
- THE VERSION OF CODE OPERATING ON YOUR MODEM CAN BE FOUND BY ISSUING AN
- 'ATI3' COMMAND.
-
- IF THE MODEM REPORTS AN EARLIER DATE THAN THE ABOVE A NEWER VERSION OF
- CODE IS AVAILABLE THROUGH FORVAL LINK.
- ----------------------------------------------------------------------
- ALL FORVAL 14.4KBPS MODEMS HAVE AS FACTORY DEFAULT V.42BIS ENABLED.
- THEREFORE WHEN ATTEMPTING TO CALL AND CONNECT TO ANOTHER MODEM THAT
- DOES NOT SUPPORT V.42BIS THE MODEM SHOULD BE SET UP AS FOLLOWS:
-
- FOR MNP MODEMS FROM FACTORY DEFAULT ISSUE:
- AT-J0
-
- THIS DISABLES THE V.42 DETECT PHASE.
-
- FOR NON ERROR CORRECTING MODEMS FROM FACTORY DEFAULT ISSUE:
- AT\N0-J0
-
- IN ADDITION TO DISABLING THE V.42 DETECT THIS ALSO TURNS OFF ALL
- ERROR CORRECTION IN THE MODEM.
-
- PLEASE ADD THESE STRINGS TO THE DIAL MODIFIER SECTION OF X-TALK'S
- DIALING DIRECTORY FOR THE TYPE OF MODEM ON THAT SYSTEM.
- ----------------------------------------------------------------------
- PROCOMMM NOTES
-
- FAILURE TO HANG-UP
-
- TO CORRECT THIS CONDITION:
-
- A. DELETE THE STRING FROM 'D- HANGUP COMMAND'.
- THIS OPTION IS FOUND IN SETUP UNDER 'MODEM OPTIONS'/'MODEM COMMANDS'
-
- B. VERIFY THAT 'D- DROP DTR BETWEEN CALLS' IS SET FOR 'YES'
- THIS OPTION IS UNDER MODEM OPTIONS / GENERAL OPTIONS OF THE
- SETUP SCREEN.
-
- THIS WILL CORRECT THE FAILURE OF PROCOMM TO HANGUP AND LOCKING UP
- THE P.C.
- ----------------------------------------------------------------------
- U.S.R. MODEM CONNECTION PROBLEM
-
- A PROBLEM HAS BEEN REPORTED AND VERIFIED WITH OUR MODEMS CONNECTING TO
- USR'S HST MODEM.
-
- WHILE WE DON'T HAVE A FIX AS OF YET WE DO HAVE A WORK AROUND THAT ALLOWS
- THE MODEM TO CONNECT TO HST MODEMS.
-
- WHEN ATTEMPTING TO CONNECT TO A HST MODEM PLEASE ISSUE THE MODEM A:
-
- 'ATN0S37=4'
-
- THIS WILL TURN OFF THE AUTO MODE DETECTION (N0) AND FORCE A V.22BIS
- CONNECTION (S37=4).
- ----------------------------------------------------------------------
- ERRATA SHEET
-
- FORVAL IM14400 AND SA14400 HIGH-SPEED DIAL-UP MODEMS
-
- IM14400 AND SA14400
-
- If a call is attempted with the originating modem having MNP
- (AT\N3) set and the answering modem having V.42 set, the
- originating modem must disable V.42 detect phase (AT-J0) in order
- to make the connection.
-
- This command (AT-J0) should also be issued when attempting a Normal
- Mode (AT\N0) connection. Although the connection may be made
- without the AT-J0 command, superfluous data transfer will result
- during the unnecessary V.42 detect phase.
-
- The documentation is not clear regarding the command AT\N6. This
- command enables: 1) LAPM; 2) fallback to MNP; and 3) fallback to
- Normal Mode. The fact that this command will enable fallback to
- Normal Mode is not clearly identified.
-
- The V.54 loopback testing (AT&Tx) is now operational. Digital
- loopback both remote and local (AT&T3, AT&T6, AT&T7) require that
- the modems make a Normal Mode connection (AT\N0) prior to loopback
- testing. A modification has been made to the AT\N commands. If
- this is set to a mode which does not allow LAPM (AT\N0-AT\N3), V.42
- detection phase is automatically turned off (same as AT-J0).
-
- -A Set Autobaud OFF
- -A1 Set Autobaud ON
- -Dn Set DTE baud rate
- 2 = 300 bit/s 8 = 12000 bit/s
- 3 = 1200 bit/s 9 = 14400 bit/s
- 4 = 2400 bit/s 10 = 16800 bit/s
- 5 = 4800 bit/s 11 = 19200 bit/s
- 6 = 7200 bit/s 12 = 38400 bit/s
- 7 = 9600 bit/s 13 = 57600 bit/s
-
- NOTE: Since specific DTE baud rates are not setable while in
- Autobaud mode, the Set Autobaud OFF command (AT-A0) must proceed
- the Set DTE Baud Rate command (AT-Dn) (i.e. the order of these two
- commands is important.)
-
- \J - Factory Default (rather than \J1)
- -L - Locks DTE setting - will not be affected by AT&F or ATZ
- ----------------------------------------------------------------------
- SA14400 MENU CHANGES
-
- Level 1 Speaker Menu Changed to Options Menu
- Level 2 Response Enable Added
- Level 0 Phone Line Characteristics:
-
- A new panel has been added to the top level of the menu. This
- panel provides a continuous display of the received signal level
- and signal to noise ratio at the modem.
-
- Phone Menu
-
- Level 2 Terminate Current Call Added
-
- Special Note for Macintosh Users: With a change of one command
- default (&D), Forval's line of 14.4kbps modems are completely
- Macintosh compatible, provided you install the correct cable and
- compatible software. (If not bundled in your modem package, you
- may receive this cable and a discount coupon for MicroPhone
- Communications software package from Forval America. Contact
- Technical Support at (801) 561-8080.)
-
- The default for the &D command series is &D1.
- ----------------------------------------------------------------------
- To all IM14400 modem users with connection problems:
-
- When there is a problem or confusion during the connection between
- high speed modems, it is often a result of the two sets of
- negotiation that take place during every connection: modulation and
- protocol. Modulation negotiation can be heard as a series of
- signals and tones on the phone lines, and determines the speed and
- communication standard (such as V.22 or V.32) of the connection.
- Next, the modems define which error correction and data compression
- techniques, if any, will be used during the protocol negotiation
- phase. Taken together, these two negotiation phases are known as
- "handshaking".
-
- The user can control which types of negotiations will be attempted.
- The commands ATNx and ATS37 determine the modulation connection.
- As modems have developed from the most basic 300 bits per second to
- the most recent 19.2 kilo-bits per second, national and
- international committees (TIA, CCITT) have formed to standardize
- the ways in which modems should communicate in order to maintain
- compatibility. Each different speed and protocol is given a name,
- and companies comply with these standards to varying degrees.
-
- These standards include (but are not limited to) Bell 103 (300 bps,
- or baud), V.21 (300 baud), Bell 212 (1200 baud), V.22 (1200 buad),
- V.23 (1200 baud), Bell 224 (2400 baud), V.22bis/V.22 (2400 baud
- fallback to 1200 baud), V.32 (9600 baud), V.32bis (14400 baud), and
- the tentatively named V.FAST (19.200 baud and up). There are also
- FAX protocols such as V.29 (9600 baud), V.27ter (4800 baud), etc.
-
- Some modem companies opt to develop their own company proprietary
- schemes rather implement industry standards. One example is U.S.
- Robotics's High Speed Transfer (HST) protocol for the 2400 bps
- modem. In order to negotiate a connection with a USR, the user
- must disable error correction/data compression (AT\N0) and lock the
- modem speed to 2400 bps (ATS37=4). In order to connect with a
- Telebit 9600, a clean line is important, or the Telebit user must
- set the PEP tones to the end of the negotiation and lengthen the
- negotiation time.
-
- The FORVAL modem will communicate using standard modulation schemes
- for all standard speeds: Bell 103, Bell 212, V.21, V.22bis, V.32
- and V.32bis. If set to multi-standard handshaking (ATN1 or
- ATN0S37=0) when a telephone connection is made, it will poll
- through these various standards trying to find one the other modem
- likes. This is the time the speaker is normally ON. When the
- speaker shuts off, the modulation phase is completed and the
- protocol phase begins.
-
- The AT\Nx commands determine which protocol negotiation is
- attempted. Forval modems can operate in one of three modes: with
- no protocol, also known as normal mode; in reliable mode, which
- uses MNP error correction and data compression techniques; or in
- LAPM mode, which uses error correction and data compression
- techniques adopted by the CCITT international committee. MNP is a
- proprietary scheme from MicroCom which has become an industry
- standard. LAPM, or "Link Access Procedure for Modems", is a CCITT
- international standard. AT/N commands are as follows:
-
- /N (or /N0) - normal mode (no protocol)
- /N1 - direct mode (for synchronous or proprietary connections)
- /N2 - reliable (MNP) mode
- /N3 - reliable with fallback to normal connection attempt
- /N4 - LAPM mode
- /N5 - LAPM with fallback to reliable
- /N6 - LAPM; fallback to MNP; fallback to normal
-
- The command AT\N0 forces the modem into normal mode and no protocol
- negotiation is attempted. The AT\N2 will only allow connections to
- other modems with MNP4 error correction. The AT\N3 mode will first
- try to negotiate MNP4, falling back to normal mode if this fails.
- The AT\N4 mode will only allow V.42 connections. AT\N5 mode will
- first try V.42 connection; if this fails it will then attempt an
- MNP4 connection.
-
- The AT\N6 mode is the most versatile. It first attempts a V.42
- connection. Failing this, it attempts an MNP4 connection, and if
- this fails it will resort to a normal mode connection. If the
- other (usually answering) modem does not use protocols, or the
- protocols are not enabled, the negotiation process (and connection
- process from the time the speaker turns off) will be up to 30
- seconds. In this case, it is important that the setting in S-
- register 7 for your modem, and the corresponding one in the remote
- modem, allow at least this long for a carrier (default is 30
- seconds).
-
- The type of data compression used during error correction is
- controlled by the AT%Cx command: AT%C to disable, and AT%C1 to
- enable. In order to utilize data compression, the modem will
- automatically implement some sort of error correction, i.e., you
- can not get compression without error correction. MNP4 error
- correction uses MNP2 data compression to yield a maximum
- compression ratio of 2:1. LAPM error correction uses V.42bis data
- compression and yields a compression ratio of up to 4:1.
-
- NOTE: If files being transfered are precompressed (e.g., "zipped"
- or "packed") compression will have no effect and may in fact result
- in slightly lower throughput than no compression.
-
- Also, if the user is calling a BBS which does not have any protocol,
- the characters sent during this negotiation attempt will be used as
- input and will most probably cause the connection to fail.
-
- If a first connection attempt with an unfamiliar modem fails, enter
- AT/N0 to to disable error correction, and AT%C to disable data
- compression. If that fails, you are probably trying to connect to
- either a US Robotics 2400, in which case you should lock your
- connection speed with ATS37=4; or it is a Telebit modem, in which
- case you should either wait for a clear line (try again later) or
- contact the remote operator and suggest that the above suggestions
- be implemented (lengthen negotiation time, set PEP tones to end of
- phase) or wait for a clearer line (i.e., call back later).
- ----------------------------------------------------------------------
- FORVALink INSTRUCTIONS
-
- THESE INSTRUCTIONS ARE FOR FORVALink UPGRADING OF THE IM14400 MODEM.
-
- THE IM14400 MODEM HAS THE ABILITY OF HAVING THE USER LOAD NEW MODEM CODE INTO
- IT. PERIODICALLY AS BUGS WITHIN THE MODEM ARE FIXED NEW CODE WILL BE
- AVAILABLE FOR DOWNLOADING FROM THE FORVALink SYSTEM (801-561-0117).
-
- TO START A FORVAL LINK DOWNLOAD USING YOUR 'COMMUNICATIONS BY CROSSTALK'
- COMM PACKAGE ENTER DIRECT MODE FROM THE MAIN DIALING DIRECTORY.
-
- ENTER THE COMMAND 'ATI7'
-
- THE MODEM WILL RESPOND WITH THE FOLLOWING:
-
- FORVAL-LINK ENABLED, WAITING FOR DIAL COMMAND. ATZx CANCELS.
-
- TO ABORT FORVAL LINK ENTER 'ATZ'
-
- TO CONTINUE ENTER THE FORVAL LINK NUMBER IN THE STANDARD DIAL STRING:
-
- 'ATDT1-801-561-0117'
-
- THE MODEM WILL PLACE THE CALL...CONNECT TO THE FORVAL LINK MODEM AND ACCEPT THE
- CODE DOWNLOADED.
-
- THE COMPLETE SEQUENCE SHOULD LOOK SIMILAR TO:
-
- ATI7
- FORVAL-LINK ENABLED, WAITING FOR DIAL COMMAND. ATZx CANCELS.
- ATDT5610117
- CONNECT 14400/REL/V42/V42bis
- LINK ESTABLISHED
- DATA REQUESTED
- ............................................................
- ............................................................
- ............................................................
- .
-
- .
- ............................................................
- ............................................................
- ............................................................
- ...........................................*
- COMPLETE
- DISCONNECTING
-
- OK
-
- THE SERIES OF DOTS (.) ARE RESULT OF THE ACTUAL CODE BEING DOWNLOADED. THIS
- SEQUENCE MAY BE SEVERAL PAGES IN LENGTH DEPENDING ON THE SIZE OF THE DOWNLOAD
- CODE.
-
- AT THE CONCLUSION OF THE DOWNLOAD THE MODEMS WILL DISCONNECT AND AN 'OK' IS
- DISPLAYED INDICATING A SUCCESSFUL DOWNLOAD.
- ----------------------------------------------------------------------