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TelebitROMinfo 5185 k `ˇˇˇˇˇˇˇˇ™U™U™U™U ˇˇˇ˜ˇˇˇˇ˜ˇˇ˜ˇwˇˇˇwˇˇˇwˇflˇwˇ˝ˇwˇ›ˇwˇ›ˇUˇ›ˇUˇ›ˇUˇÓˇUˇªˇUˇUˇUˇUˇw›w›w›w›
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Telebit Corporation ** TECHNICAL SERVICE ADVISORY ** March 17, 1993
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MOD.1.393
Telebit Corporation, in keeping with its policy of providing the highest-
quality data communications products, is providing this document which
contains information on specific versions of firmware for the WorldBlazer
and T3000 family of modems. Telebit is confident that all problems
listed in this document are fixed in version LA7.02. If you are having
any problems specific to one of the versions of firmware mentioned below,
please upgrade the modem(s) to firmware version LA7.02. Any modem
problems not listed here should be reported directly to Telebit Technical
Support at (800)835-3248 or (408)734-5200.
To find out the current version of firmware in your modem:
1) Connect your modem to a terminal or a computer running a
terminal emulation program.
2) Type ATI3. Then press Enter.
3) Modem responds with current version.
Example: ATI3
WorldBlazer - SA - Version LA7.02
OK
Upgrading firmware involves the following:
1) Printing out current configurations.
2) Disconnecting the modem from any DTE devices and opening up
the case with a small Phillips head screwdriver.
3) Replacing the current firmware with version LA7.02.
4) Powering on the modem, allowing it to run through diagnostic
tests. (about 30-40 seconds)
5) Reconnecting the modem to the DTE equipment and reprogramming
nonvolatile memory from the original printout.
Below is a list of known problems that pertain to specific versions
of firmware. Make sure a problem exists in YOUR version before
requesting an upgrade.
* Known Problems *
--> LA7.01
1 - When used in an unattended answering environment, the WorldBlazer
or T3000 will randomly fail to answer a call. Power cycling the
modem solves the problem.
--> LA5.01 has problem #1 in addition to the following:
2 - During a V.32bis (14,400 bps) connection, a small amount of line
noise may be detected, causing the modems to fall back within the
modulation to a lower rate (such as 12,000 bps). If the line
conditions are improved, a V.32bis modem may request that the
modulation rate be increased to the previous higher rate. The
WorldBlazer and T3000 will not respond to this fall-forward
request.
3 - After detecting an unacceptable amount of line noise on a V.32bis
(14,400 bps) connection, the CD light begins flashing, signaling
a retrain. The modem does not reestablish the connection. After
the failed connection, the WorldBlazer or T3000 may begin to send
the OK result code back to the DTE at approximately 10-second
intervals. This problem can be solved if the user forces a V.32
(9600 bps) connection. Setting S50=6 forces the connection
speed to V.32.
4 - All modem lights from MR to CTS are on and/or the user cannot get
any response from the modem after the remote modem has disconnected
the call. Power cycling the modem solves the problem.
--> LA5.00W has problems 1 through 4 in addition to the following:
5 - When *answering* a call with the modem connected to a UNIX system
configured for UNIX UUCP-G protocol and a window size greater than
3, the protocol startup will fail. On many UNIX systems, a -x9
debug dump of the session from the remote (originating) modem will
report: "UUCP Startup Failed"
6 - When *originating* a call, the WorldBlazer does not connect in PEP
mode to older TrailBlazer Plus modems with firmware version BA4.00.
The table below summarizes the above information.
* Firmware * * Release * * Known *
* Version * * Date * * Problems *
--> LA7.02 --> 1/93 --> None
--> LA7.01 --> 12/92 --> 1
--> LA5.01 --> 8/92 --> Has problem 1 in addition to
problems 2, 3 and 4.
--> LA5.00W --> 5/92 --> Has problems 1 through 4 in
addition to problems 5 and 6.
After carefully examining this document, if you determine that your
modem is experiencing a firmware-related problem, you may request a
FREE LA7.02 upgrade from Telebit Technical Support. Please call
Technical Support at (800)835-3248 or (408)734-5200. Follow the
PhoneMail system prompts to Modem Technical Support.
Please *call* Telebit and talk to a Modem Support Technician if you
have any questions regarding this document.
Note: Telebit will ship to U.S. and Canada addresses only.