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. Williamsroot@zswamp.uucp (Geoffrey Welsh) (04/18/91)
In a letter to All, Bob Izenberg (bei@dogface ) wrote: >When I last looked, Hayes support for 3B2s wasn't the best. What do you want in the way of 'support'? Your 3B2, on which I presume you're running AT&T UNIX of at least 3.1 vintage, should come with uucp and cu; once you've configured the on-board software for your modem, no extra support is needed. Frankly, any problems you'll have will be better dealt with by asking your OS support people to help yo configure the serial port rather than the modem support people. >The modem that I go with should do at least 2400 baud, That's pretty much understood these days. >and should be able to have DCD true all the time, >dipping DCD and then raising it when a valid carrier >is detected. I haven't seen too many of these. >Transparency to uucp 'g' is a must. I have not in the past decade met a single modem that could not be configured to be transparent. Geoff DISCLAIMER: I wish I worked for someone on whose behalf I could deny responsibility for my comments. I'm only a poor schmuck who has connected a Trailblazer Plus to a 3B2 ACP on a 3B4000. -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 The mile is traversed not by a single leap, but by a procession of coherent steps; those who insist on making the trip in a single element will be failing long after you and I have discovered new worlds. -- me
jiro@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.root@zswamp.uucp (Geoffrey Welsh) (04/19/91)
Jiro Nakamura (jiro@shaman.com ) wrote: >> Transparency to uucp 'g' is a must. > Aren't Telebits the only ones that do UUCP-g spoofing? Transparency, not spoofing, wask asked for. Perhaps spoofing was meant, but I prefer to answer questions directly and, when assumptions are necessary, state them clearly. >Does anyone else do this? Microcom claims to do protocol spoofing, but I've never use Microcom brand modems. <sigh> >Also, Telebit can only do spoofing in PEP mode, right - so that >rules out compatibility with other modems.... I was under the impression that the latest Telebit 2500 could do spoofing in V.32 mode, but I could be wrong. <grin> Still, you're right: it probably wouldn't be compatible. Anyone ever tried spoofing in a Telebit 1600 - Microcom QX/V.32 connection? -- UUCP: watmath!xenitec!zswamp!root | 602-66 Mooregate Crescent Internet: root@zswamp.fidonet.org | Kitchener, Ontario FidoNet: SYSOP, 1:221/171 | N2M 5E6 CANADA Data: (519) 742-8939 | (519) 741-9553 The mile is traversed not by a single leap, but by a procession of coherent steps; those who insist on making the trip in a single element will be failing long after you and I have discovered new worlds. -- me
daveg@misty.sara.fl.us (Dave Goodman) (04/19/91)
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: > > 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. Hmm... I was under the impression that, in V.32 mode, spoofing only operated with MNP error correction, not V.42. Any authorities out there? Greg? -- Dave Goodman . . . . . __|__ . . . . . . . . daveg@misty.sara.fl.us . . --o--o--(_)--o--o-- . ....uunet!misty!daveg
bei@dogface (Bob Izenberg) (04/19/91)
root@zswamp.uucp (Geoffrey Welsh) writes: > Transparency, not spoofing, wask asked for. Perhaps spoofing was meant, > but I prefer to answer questions directly and, when assumptions are necessary > state them clearly. I'm proud of you. Transparency was what I meant. Two sites that I connect to got snookered on their modem choice. Contrary to your assertion in an earlier message, there are some modems that are extremely difficult to make unobtrusive to a constant data stream. The old Racal-Vadic Maxwell 1200 comes to mind. -- Bob Bob Izenberg cs.utexas.edu!dogface!bei [ ] "So young, so bad... So what!" 512 346 7019 Wendy O. Williams
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.
gandrews@netcom.COM (Greg Andrews) (04/20/91)
In article <514@misty.sara.fl.us> daveg@misty.sara.fl.us (Dave Goodman) writes: >In article <BOB.91Apr18082452@volitans.MorningStar.Com> bob@MorningStar.Com (Bob Sutterfield) writes: >> >>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. > >Hmm... I was under the impression that, in V.32 mode, spoofing only >operated with MNP error correction, not V.42. Any authorities out >there? Greg? > Oops! I overlooked the wording in Bob's article. You're right, the Telebit modems (T2500, T1500, and T1600, in this case) do protocol spoofing only in V.32/MNP mode, not in LAP-M (V.42) mode. Support for spoofing in LAP-M mode may become available sometime in the future. -- .------------------------------------------------------------------------. | Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews | | | Internet: gandrews@netcom.COM | `------------------------------------------------------------------------'
gandrews@netcom.COM (Greg Andrews) (04/21/91)
In article <482@rescon.UUCP> bud@rescon.UUCP (Alex Batyi) writes: > >>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. > What do you mean by "spoofs"? Spoofing is the conventional term for a special feature in the modem where it becomes intimately involved in the file transfer protocol. The mere ability to do uucp transfers with the modem is not "spoofing", only when the modem has a special feature for the protocol. What special register/switch settings do you adjust to turn on the spoofing in your MultiTech 224EH? -- .------------------------------------------------------------------------. | Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews | | | Internet: gandrews@netcom.COM | `------------------------------------------------------------------------'
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
bourman@hpcc01.HP.COM (Bob Bourman) (04/24/91)
/ hpcc01:comp.dcom.modems / gandrews@netcom.COM (Greg Andrews) / 7:19 pm Apr 20, 1991 / In article <482@rescon.UUCP> bud@rescon.UUCP (Alex Batyi) writes: > #>>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. #> #What do you mean by "spoofs"? Spoofing is the conventional term for a #special feature in the modem where it becomes intimately involved in the #file transfer protocol. The mere ability to do uucp transfers with the #modem is not "spoofing", only when the modem has a special feature for #the protocol. #What special register/switch settings do you adjust to turn on the spoofing #in your MultiTech 224EH? -- #.------------------------------------------------------------------------. #| Greg Andrews | UUCP: {apple,amdahl,claris}!netcom!gandrews | #| | Internet: gandrews@netcom.COM | #`------------------------------------------------------------------------' ---------- I think there is some confusion concerning the term spoofing. The Multitech 224 spoofs HP ENQ/ACK ^E/^F for the HP3000 machines. I don't believe this has anything to do with UUCP. If ^E/^F are a factor in UUCP transfers, then you will need to turn ENQ/ACK pacing off AT&E8. You may want to turn off Pacing AT&E12. This makes the modem transparent to any flow control. This might mess up binary file transfers. If you use speed conversion you need flow control. BOBB
tech@mich-ns.UUCP (Mich. Network Sys. TECH SUPPORT) (04/25/91)
In article <1991Apr18.005851.869@shaman.com> jiro@shaman.com (Jiro Nakamura) writes: "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.... Not sure if anyone else does it. The T2500 does protocol spoofing for UUCP-G, KERMIT, XMODEM and YMODEM in PEP mode. The T1600 (Telebit's V.32 modem) does spoofing in V.32 mode. " Hope this helps. Telebit Tech support (1800-Telebit) is usually "excellent by computer standards. " Your local Telebit distributor should be able to lend assistance too. -- Michigan Network Systems Technical Support Division 1-800-736-5984 BBS: +1 313 343 0800 TELEBIT DIGIBOARD WESTERN DIGITAL 3COM SCO INTERACTIVE UNIX MICROPOLIS ADAPTEC