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- Xref: sparky comp.dcom.modems:12255 biz.comp.telebit:835
- Newsgroups: comp.dcom.modems,biz.comp.telebit
- Path: sparky!uunet!uvaarpa!darwin.sura.net!wupost!cs.utexas.edu!sun-barr!ames!sgi!rhyolite!vjs
- From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
- Subject: Re: WB hangs occasionally
- Message-ID: <op3jlro@rhyolite.wpd.sgi.com>
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <scs.713738821@hela.iti.org> <1992Aug15.184850.13845@isus.UUCP>
- Date: Wed, 19 Aug 1992 14:10:50 GMT
- Lines: 39
-
- In article <1992Aug15.184850.13845@isus.UUCP>, hoyt@isus.UUCP (Hoyt A. Stearns jr.) writes:
- > ....
- > I've had it not answer; hold the phone off hook with no carrier
- > indefinitely, even with a 12 minute timeout set (S7?); put a busy-signal
- > like wide band carrier out when answering (tones not in any modem standard,
- > sounds more like a processor crash); it fails to reload defaults with
- > data terminal ready transitions, etc.
- >
- > There is really no excuse for this. At least it should have a software
- >watchdog timer to reset in a crash or lockup....
-
- > ....
- > The work around for me is to have cron turn off the power to the modem
- > every night in the wee hours.
-
- There is also the deadlock of some kind in the old T2500, where CTS is
- stuck false, DCD true, both modems on the line, no data moving, and
- lasting for days. This can be easily repeated in about 3 minutes by
- stuffing as much data as the modems will accept (honoring CTS) at
- 19.2. (I use SLIP and `ping -s 3000` to saturate and so lock them up.)
-
- I think such bugs are excusable, if only because I have pulled such
- stunts myself. Watchdog timers are dangerous and can be expensive if
- you do not already have a timer mechanism for other purposes. Without
- a lot of care, watchdogs can make the system (modem, computer,
- whatever) less reliable. What is inexcusable is refusing to
- acknowledge such bugs or eventually fixing them. Perhaps no new
- firmware is planned for the T2500 nor has been planned for the 18
- months or 2 years. That would be an acceptable excuse for not fixing
- the T2500 bug, since it is not reasonable to expect PROMS for $500
- modems without maintenance fees forever. However, I cannot think of
- any excuse for Telebit's persistent refusal to acknowledge the T2500
- bug.
-
-
- Vernon Schryver, vjs@sgi.com
-
- (I'll try not to go too non-linear again if someone from Telebit again
- claims to have never heard of this.)
-