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- Newsgroups: comp.dcom.modems
- Path: sparky!uunet!decwrl!adobe!andrich.mv.us.adobe.com!user
- From: rfall@mv.us.adobe.com (Richard Fall)
- Subject: Re: HUGE WORLDBLAZER problems...
- Message-ID: <rfall-040992171134@andrich.mv.us.adobe.com>
- Followup-To: comp.dcom.modems,comp.sys.mac.hardware
- Sender: usenet@adobe.com (USENET NEWS)
- Organization: Adobe
- References: <1992Sep4.115114.1@hmcvax.claremont.edu>
- Date: Sat, 5 Sep 1992 00:20:13 GMT
- Lines: 54
-
- In article <1992Sep4.115114.1@hmcvax.claremont.edu>,
- afrancke@hmcvax.claremont.edu wrote:
- >
- > Here's the scoop on a modem problem I've been having ever since I picked it up:
-
- [Problem details deleted]
-
- > I have had enormous problems getting my Telebit WorldBlazer to work properly
- > with the SE/30 (which HAS had a serial port loopback check performed
- > successfully by an authorized Apple dealer recently).
-
- [...]
-
- This smells like a problem with some of the earlier Worldblazers, in which
- the
- voltages on the serial port outputs were lower than the RS-232 (or RS-422?)
- standard called out. This caused the modem to exhibit all manner of
- strange
- behavior, since it didn't drive the received data line or the handshaking
- signals
- "hard" enough.
-
- (I may have this backwards--it may have been a problem in the _received_
- voltage
- levels the WorldBlazer saw.)
-
- In any case, I'd call Telebit back, tell them you may have an earlier
- version of
- the WorldBlazer that has that "RS-232 voltage problem". Have the serial
- number
- handy, and don't give up until you talk to a tech who is aware of this
- problem
- and can check your serial number (the problem was fixed past a certain
- serial
- number).
-
- You might also check the voltage levels on the Mac itself. In spite of the
- fact
- that the loopback test worked, the voltage levels might still be too low
- for the
- WorldBlazer to "see", although the Mac saw them OK.
-
- Good luck.
-
- > Andrew Francke
- > afrancke@hmcvax.claremont.edu
-
- +--------------------------------+-----------------------------------+
- | Richard Fall | Voice: (415) 962-4889 |
- | Adobe Systems, Incorporated | Fax : (415) 903-9652 |
- | P.O. Box 7900 |-----------------------------------|
- | 1585 Charleston Road | Internet: rfall@mv.us.adobe.com |
- | Mountain View, CA 94039-7900 | UUCP: ..!decwrl!adobe!rfall |
- +--------------------------------+-----------------------------------+
-