bei@dogface (Bob Izenberg) (04/17/91)
I'm going to be in the market for a modem for a 3B2/400 in the near
future. Telebit is a likely choice, but I'd like some other options.
When I last looked, Hayes support for 3B2s wasn't the best. The modem
that I go with should do at least 2400 baud, and should be able to have
DCD true all the time, dipping DCD and then raising it when a valid carrier
is detected. Transparency to uucp 'g' is a must.
Any comments about pricing, support, reliability or anything else are
welcome.
Thanks!
-- Bob
Bob Izenberg
cs.utexas.edu!dogface!bei [ ] "So young, so bad... So what!"
512 346 7019 Wendy O. Williamsjiro@shaman.com (Jiro Nakamura) (04/18/91)
In article <a50i11w164w@dogface> bei@dogface (Bob Izenberg) writes: >I'm going to be in the market for a modem for a 3B2/400 in the near >future. Telebit is a likely choice, but I'd like some other options. >When I last looked, Hayes support for 3B2s wasn't the best. The modem >that I go with should do at least 2400 baud, and should be able to have >DCD true all the time, dipping DCD and then raising it when a valid carrier >is detected. Transparency to uucp 'g' is a must. Aren't Telebits the only ones that do UUCP-g spoofing? Does anyone else do this? Also, Telebit can only do spoofing in PEP mode, right - so that rules out compatibility with other modems.... I personally own a T2500 and am very happy with it. I think the funky DCD handling you require is under register 131=3, I'm not sure so here's the whole gamuk: S131 = 0 DCD always on 1 DCD on when carrier detected 2 DCD on when modem ready to accept commands or data 3 DCD on when modem ready to accept command or data. When carrier is lost, DCD is turned back off for the amound of time specified by the S47 register and then back on. 4 DCD is the inverse of CTS in command and online modes. Hope this helps. Telebit Tech support (1800-Telebit) is usually excellent by computer standards. - jiro -- Jiro Nakamura jiro@shaman.com Shaman Consulting (607) 253-0687 VOICE "Bring your dead, dying shamans here!" (607) 253-7809 FAX/Modem
bob@MorningStar.Com (Bob Sutterfield) (04/18/91)
In article <1991Apr18.005851.869@shaman.com> jiro@shaman.com (Jiro Nakamura) writes:
Aren't Telebits the only ones that do UUCP-g spoofing? Does anyone
else do this?
I don't know of anyone else. To interoperate with Telebits, they'd
need to adopt (i.e. license) Telebit's spoofing scheme.
Also, Telebit can only do spoofing in PEP mode, right - so that
rules out compatibility with other modems....
The T2500 (firmware rev 7 or better) and T1600 can spoof over V.32
connections if either MNP or V.42 error correction is operating.bud@rescon.UUCP (Alex Batyi) (04/20/91)
In article <BOB.91Apr18082452@volitans.MorningStar.Com> bob@MorningStar.Com (Bob Sutterfield) writes: >In article <1991Apr18.005851.869@shaman.com> jiro@shaman.com (Jiro Nakamura) writes: > Aren't Telebits the only ones that do UUCP-g spoofing? Does anyone > else do this? > >I don't know of anyone else. To interoperate with Telebits, they'd >need to adopt (i.e. license) Telebit's spoofing scheme. My MultiTech224EH spoofs UUCP. Also I thought algorythms couldn't be copyrighted. -- AJB +1 215 788 5957 {cdin-1 wells}!alba2l!bud Quote:"If you lose your memory, forget it!" bud@alba2l.UUCP Agnostic, dyslexic, insomniac: Someone who stays up all night wondering if there really is a Dog.
woods@robohack.UUCP (Greg A. Woods) (04/22/91)
In article <a50i11w164w@dogface> bei@dogface (Bob Izenberg) writes: > I'm going to be in the market for a modem for a 3B2/400 in the near > future. Telebit is a likely choice, but I'd like some other options. > When I last looked, Hayes support for 3B2s wasn't the best. The modem > that I go with should do at least 2400 baud, and should be able to have > DCD true all the time, dipping DCD and then raising it when a valid carrier > is detected. Transparency to uucp 'g' is a must. Hmmm... First off, unless you have an older, broken, version of HDB-UUCP, then you *don't* need to have DCD high. On the other hand, if you do have an older, broken, version of HDB-UUCP, you need a relatively smart modem that can hold DTR up normally, but drop it for a few seconds when carrier is lost (i.e. when it hangs up). Some other folks who followed up have suggested Telebit modems with their PEP support and UUCP 'g' protocol spoofing. I don't think that's what you meant -- I'd guess you only want to run UUCP 'g' through your modem, and you would like at least 2400 bps throughput. I'm currently running two Hayes modems on this 3B2/400. I certainly don't have them set to assert DCD continuously either. They work fine for the most part, *BUT* they occasionally hang the port. I'm not sure whose "fault" this is, but I suspect the modems are part of it, since I've used other modems with no problem. Periodically, usually after conversing with a Telebit modem of some sort, and after going on-hook, the RD and SD, or sometimes just the SD light will go on solid. However, there seems to be no actual traffic through the port. At the same time connecting to the port with cu results in nothing. Temporary disconnection of the RS-232 cable does nothing to help. Disconnecting the RS-232 and re-setting the modem also does nothing. Attempting to drop DTR via 'stty 0' does nothing. The only thing that seems to restore normal operation (short of re-booting) is to re-set the modem while the RS-232 is still connected. For the record, I have a Hayes SmartModem 2400 and a Hayes V-Series SmartModem 9600 currently attached to an EPORTS card. > Any comments about pricing, support, reliability or anything else are > welcome. The very best 2400 baud modem I ever used anywhere, including on the 3B2 was an AT&T DataPhone II 2224B. It had the smarts to be able to run with DTR as I describe above, and seemed to *always* work with exceptional reliability -- until it took a lightning bolt in the phone jack.... :-( -- Greg A. Woods woods@{robohack,gate,eci386,tmsoft,ontmoh}.UUCP +1 416 443-1734 [h] +1 416 595-5425 [w] VE3-TCP Toronto, Ontario; CANADA