rmg@ultra.com (Rich Geiger) (09/10/90)
The following information is reporoduced from an Ultra internal
document we use to keep information about dial-in access to our
systems. It is provided to the net in the hopes that it may be useful
to others. We make no representation as to the accuracy, completeness,
or reliability of this information.
- Rich Geiger
Ultra Network Technologies / 101 Daggett Drive / San Jose CA 95134
rmg@ultra.com ...!ames!ultra!rmg (408) 922-0100 [w] (408) 739-7911 [h]
-------------------- cut --------------------
========== Interoperability
Well, here in the 90's, modem compatibility and interoperability can get
more than a little complex. Therefore, we will keep the following notes
about the types of modems known to work correctly when dialing in to
Ultra, which ones have problems, known workarounds, etc., etc...
Unless otherwise noted, all remarks refer to dialing in to Ultra's T2500s,
in the configuration shown at the end of this document. In some cases, as
noted, we are also collecting information about interoperability between
various modems and T2500s from sources external to Ultra. In these cases,
we cannot be sure that the information is accurate with respect to our own
T2500 configuration, but it may be a helpful indication of what to expect.
As of September 1990, this section ("Interoperability") of this document
may be posted to the Net (comp.dcom.modems) from time to time, in an
attempt to gather and consolidate information about experiences connecting
to T2500s (or other Telebit modems). It is specifically *not* my intent to
turn this into a general compendium of modem interoperability, nor to
establish a regular periodic posting of this information. It will be
reposted only as the receipt of additional information an my own "spare"
(hah!) time allow.
Please send mail to rmg@ultra.com if you have additional questions, or
information about modems not listed here. The goal is to save our friends
the trouble of discovering all this stuff on their own.
Ultra Network Technologies provides this information in the hopes it may
be helpful to others, but makes no guarantee as to the accuracy or
reliability of the information provided.
AT&T Unix PC OMB (on-board modem)
- A report from the Net says that this modem will not properly connect
to some Telebit models ("Trailblazers for sure", possibly others), if
the Telebit interface speed is locked.
Hayes Smartmodem 1200
- seems to work fine at 300/1200/2400.
Everex Evercom 24/24E
- Assumption: "Evercom 24" is an internal modem; "24E" is the external
version of the same thing; if anyone knows this to be a fact, please
confirm.
- This modem seems to work fine at 300/1200/2400.
- There is one report from the net of the Everex failing occasionally to
negotiate a protocol and connect with a Telebit (model unspecified)
modem.
Everex Evercom 24+
- Guess: "Evercom 24+" is an internal modem for the IBM PC and clones;
there is also an external model called "Evercom 24+E" (or some such).
If anyone knows this to be a fact or not, please confirm or deny.
- Seems to work fine at 300/1200.
- With some older firmware (an EPROM), we have seen this model have
problems making a V.22bis (2400 baud) connection. One reported symptom
is that you will hear the ring, hear the Telebit answer, and right
after the first V.32 "pip", the Everex will give NO CARRIER. Everex
was contacted about this, and sent new firmware which seems to correct
the problem. The revision of the fixed firmware we received is
(contact brink@ultra.com). With the fix installed, the modem connects
properly at 300/1200/2400, and MNP works correctly.
Practical Peripherals 2400MNP
- Seems to work fine at 300/1200/2400 speeds, with MNP.
Telebit Trailblazer+
- No known problems (one should hope not!)
Telebit T1000
- use S50=255 on the calling modem if you want to get a PEP connection
Telebit T2500
- use S50=255 on the calling modem if you want to get a PEP connection
Toshiba T5100 (PC internal)
- We have reports from the Net that this modem has problems connecting
with T2500s at 2400 baud. There are also reports from the Net that
this modem has trouble connecting with other V.32 modems.
- A posting from the Net indicates that Telebit has reproduced this
problem. A reported fix is to force the Telebit to lock its interface
at 2400 baud ((S50=3, S51=2); we cannot do this with our modems,
however, as it would preclude use at other speeds.
US Robotics Courier
- Works fine at 1200/2400.
Worldport 1200
- A report from the net indicates that this modem works OK.
Worldport 2400
- We have seen problems making a V.22bis (2400 baud) connection. It
seems to be marginal; works sometimes, other time not. Seems to work
OK at 300/1200.
========== Telebit T2500 setup: ==========
E1 F1 M1 Q0 T V1 W0 X14 Y0 &P0 &T4 Version GE6.01-T2500
S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=040 S08=002 S09=006
S10=007 S11=070 S12=050 S18=000 S25=005 S26=000 S38=000
S41=000 S45:255 S47=004 S48=000 S49=000
S50=000 S51=255 S52:002 S54:003 S55:003 S56=017 S57=019 S58=003 S59=000
S61:200 S62=003 S63=001 S64=000 S65=000 S66=000 S67=000 S68=255 S69=000
S90=000 S91=000 S92:001 S93=008 S94=001 S95:002 S96=001 S97=000 S98=003
S100=000 S101=000 S102=000 S104=000 S105=001 S106=000 S107=020
S110=255 S111=255 S112=001
S121=000 S130=002 S131:001
S150=000 S151=004 S152=001 S153=001 S154=000 S155=000
S160=010 S161=020 S162=002 S163=003 S164=007 S255=000
--
- Rich Geiger
Ultra Network Technologies / 101 Daggett Drive / San Jose CA 95134
rmg@ultra.com ...!ames!ultra!rmg (408) 922-0100 [w] (408) 739-7911 [h]todd@uhccux.uhcc.Hawaii.Edu (Todd Ogasawara) (09/11/90)
In article <1990Sep10.164452.20396@ultra.com> rmg@ultra.com writes: >Hayes Smartmodem 1200 > - seems to work fine at 300/1200/2400. ^^^^ :-) I have tried an ancient (1983 or 84) Hayes 1200 with two T2500 modems with no problems (other than the fact that the Hayes 1200 is extremely noisy). >Everex Evercom 24/24E > - Assumption: "Evercom 24" is an internal modem; "24E" is the external > version of the same thing; if anyone knows this to be a fact, please > confirm. > - This modem seems to work fine at 300/1200/2400. Have not tried the internal modem. Can verify that the external modem works fine though. In fact, it works better than the newer 24+E with the T2500. >Everex Evercom 24+ > - Guess: "Evercom 24+" is an internal modem for the IBM PC and clones; > there is also an external model called "Evercom 24+E" (or some such). > If anyone knows this to be a fact or not, please confirm or deny. > - Seems to work fine at 300/1200. Have not been able to use the internal 24+ with a T2500 at 2400baud. It will, however, connect ok at 1200 baud. The external 24+E only works if you "deafen" it for a few seconds by placing pauses after the phone number. E.g., ATDT 123-4567,,,, >Toshiba T5100 (PC internal) > - We have reports from the Net that this modem has problems connecting > with T2500s at 2400 baud. There are also reports from the Net that > this modem has trouble connecting with other V.32 modems. I was one of those reporting this problem. I verified it with Telebit last week. No further comments from them since that verification though. FYI: the modem does work at 1200 baud. Like the internal Everex 24+, it works at 1200 baud and does not at 2400. > - A posting from the Net indicates that Telebit has reproduced this > problem. A reported fix is to force the Telebit to lock its interface > at 2400 baud ((S50=3, S51=2); we cannot do this with our modems, > however, as it would preclude use at other speeds. Right. I was the one that reported that. I said the same thing about making the T2500 useless to me to Telebit. They, of course, conceeded that point. Has anyone successfully dialed into a T2500 with a US Robotics HST modem? I tried the other day and it kept connecting at 2400baud. This was despite the fact that I hard wired both ends to 9600. -- Todd Ogasawara, U. of Hawaii UUCP: {uunet,ucbvax,dcdwest}!ucsd!nosc!uhccux!todd ARPA: uhccux!todd@nosc.MIL BITNET: todd@uhccux INTERNET: todd@uhccux.UHCC.HAWAII.EDU
max@phillo.SUBLINK.ORG (Massimo Gentilini) (09/18/90)
Mr. Todd Ogasawara on his message of 14 Sep 90 , says: >> - Guess: "Evercom 24+" is an internal modem for the IBM PC and clones; >> there is also an external model called "Evercom 24+E" (or some such). >> If anyone knows this to be a fact or not, please confirm or deny. >> - Seems to work fine at 300/1200. TO> Have not been able to use the internal 24+ with a T2500 at 2400baud. TO> It will, however, connect ok at 1200 baud. The external 24+E only TO> works if you "deafen" it for a few seconds by placing pauses after the TO> phone number. E.g., ATDT 123-4567,,,, My, after changing the firmware with the "C" release of the Eprom works well. I connect every day with both T2500 and HST DS without a problem and often had more than 255 CPS transferring compressed files. ciao ciao -- E-Mail one of the following addresses: ****************************** UseNet: max@phillo.sublink.org * (2B) || !(2B) = ??? * FidoNet: 2:332/401 Bix: MaxGent ****************************** *** call my BBS at 0039-51-6343719, 2400 bps 24 hrs, 200Mb online ***
jeff@xanadu.com (Jeff Crilly N6ZFX) (10/03/90)
In article <9314@uhccux.uhcc.Hawaii.Edu> todd@uhccux.UUCP (Todd Ogasawara) writes: >Has anyone successfully dialed into a T2500 with a US Robotics HST modem? I >tried the other day and it kept connecting at 2400baud. This was despite >the fact that I hard wired both ends to 9600. > >-- >Todd Ogasawara, U. of Hawaii >UUCP: {uunet,ucbvax,dcdwest}!ucsd!nosc!uhccux!todd >ARPA: uhccux!todd@nosc.MIL BITNET: todd@uhccux >INTERNET: todd@uhccux.UHCC.HAWAII.EDU Huh? The HST modem from USRobotics won't talk to the T2500 at anything faster than 2400 bps. The HST doesn't have V.32. Now if you have a USRobotics HST-Dual, then it works fine. We have both here -- stand-alone T2500s and HST-Duals (stand-alone and rackmount). I tested the V.32 connections and it works fine with the Dual and the T2500. BTW, the HST-Dual has V.32 in addition to the asymetrical HST protocol. Jeff Crilly (N6ZFX) AMIX Corporation 2345 Yale Street Palo Alto, CA 94306 jeff@amix.com, {uunet,sun}!markets!jeff, N6ZFX@N6IIU.#NOCAL.CA.USA