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- Path: sparky!uunet!olivea!hal.com!decwrl!bu.edu!buengc.bu.edu!apollo
- From: apollo@buengc.bu.edu (Doug A. Chan)
- Newsgroups: comp.dcom.modems
- Subject: Intel 400/e bug
- Message-ID: <95153@bu.edu>
- Date: 2 Sep 92 00:37:13 GMT
- Sender: news@bu.edu
- Distribution: na
- Organization: College of Engineering, Boston University, Boston, MA, USA
- Lines: 26
- Originator: apollo@buengc.bu.edu
-
- I've got a few different brands of modems attached to a Xylogics Annex
- terminal server. Two of which happen to be new Intel 400e (14.4k external
- fax/modems)... Well, I got complaints from some people who tried to
- dial into these modems that they would connect but can't do anything else.
- After one and a half days of digging (and loss of much hair), I have found
- the bug.
-
- When the Annex terminal server hangs up a call, it drops DTR and RTS.
- If the following is done:
- 1) Drop RTS signal
- 2) Drop DTR signal (modem should disconnect as usual)
- 3) Raise RTS
- 4) Raise DTR (allow for next incoming call)
- the next caller can connect but will be in limbo. The modem thinks that
- the RTS signal is still low. However, if the caller hangs up now, the
- modem will work normally for the next call. This has the effect
- of making the modem work only for every other call!
-
- FYI, the modems' settings were (S0=1 E0 Q1) and DTE is 38.4K.
-
- The connect speed, error correction and compression setting have no
- effect on the problem.
- I'm currently waiting for Intel's response....
-
- -Doug
- apollo@buengc.bu.edu
-