d_volaric@vaxa.uwa.oz (02/14/89)
Does anyone out there know if there are serious problems using US 9600 modems in Australia (besides the power supply / Telecom (dis)approval)? In particular I'm thinking of buying a Courier HST 9600 baud modem or a Telebit 1000 (I think, its the one that supposedly does 38,000 with MNP). Any recomendations between them? The only use I'll be putting them to will (probably) be calling up the US. Any help or advice be apreciated.
felstein@mcnc.org (Bruce M. Felstein) (02/15/89)
I think that you will find that the most used modem for 9600 baud communications in the United States is the US Robotics HST. The Telebit has trouble connecting at other speeds from what I've seen. USR is coming out with major modifications to the HST very shortly, although I'm not at liberty to say what they are, but you won't be dissapointed in speed or performance along with the fact that they will also be V.32 as well as HST compatible. ------------------------------------------------------------------------ The views expressed are not necessarily those of my employer Bruce Felstein - Microelectronics Center of NC felstein@mcnc.org - Research Triangle Park, NC
david@ms.uky.edu (David Herron -- One of the vertebrae) (02/16/89)
In article <4035@alvin.mcnc.org> felstein@mcnc.org.UUCP (Bruce M. Felstein) writes: >I think that you will find that the most used modem for 9600 >baud communications in the United States is the US Robotics >HST. The Telebit has trouble connecting at other speeds from what >I've seen. eh? you must not've been looking too well ... My trailblazer has no problems at all connecting at any speed I try it at. This includes 1200 & 2400 baud. The 2400 baud & MNP mode even works better than the MultiTech 2400E that we have... Telebits have, as I see it, only *one* disadvantage. They don't conform to the (technically inferior) V.29 standard or (technically somewhat equivalent) V.32 standard. -- <-- David Herron; an MMDF guy <david@ms.uky.edu> <-- ska: David le casse\*' {rutgers,uunet}!ukma!david, david@UKMA.BITNET <-- Now I know how Zonker felt when he graduated ... <-- Stop! Wait! I didn't mean to!
frank@rsoft.UUCP (Frank I. Reiter) (02/16/89)
In article <4035@alvin.mcnc.org> felstein@mcnc.org.UUCP (Bruce M. Felstein) writes: >The Telebit has trouble connecting at other speeds from what >I've seen. USR is coming out with major modifications to the HST >very shortly, although I'm not at liberty to say what they are, but >you won't be dissapointed in speed or performance along with the >fact that they will also be V.32 as well as HST compatible. We are using a Trailblazer+ on The MIND LINK BBS and have no trouble accepting calls at 300/1200/2400/9600 baud. Telebit has also come announced a dual protocol modem which is both PEP and V.32 compatible. I've starting saving... -- _____________________________________________________________________________ Frank I. Reiter UUCP: {uunet,ubc-cs}!van-bc!rsoft!frank Reiter Software Inc. frank@rsoft.bc.ca, a2@mindlink.UUCP Langley, British Columbia BBS: Mind Link @ (604)533-2312, login as Guest
james@bigtex.cactus.org (James Van Artsdalen) (02/16/89)
In <4035@alvin.mcnc.org>, felstein@mcnc.org.UUCP (Bruce M. Felstein) wrote: > I think that you will find that the most used modem for 9600 > baud communications in the United States is the US Robotics > HST. In the non-unix market probably so. But certainly not in the unix market. I've only heard of one or two sites trying to run uucp over the HST, and the results were horrible. Interactive response with the 'blazer is good enough, though not instant. > The Telebit has trouble connecting at other speeds from what > I've seen. Not true. My 'blazer runs at > 9600bps all day, along with 2400bps and some 1200bps traffic. The HST and V.32 modems should have better interactive "feel", but the 'blazer stomps both in terms of raw throughput. > USR is coming out with major modifications to the HST very shortly, > although I'm not at liberty to say what they are, [...] They already released that modem. Now if only Telebit would release a PEP/V.32 modem that supports SLIP. With a half price deal, of course... :-) -- James R. Van Artsdalen james@bigtex.cactus.org "Live Free or Die" DCC Corporation 9505 Arboretum Blvd Austin TX 78759 512-338-8789
john@zygot.UUCP (John Higdon) (02/16/89)
In article <4035@alvin.mcnc.org>, felstein@mcnc.org (Bruce M. Felstein) writes: > I think that you will find that the most used modem for 9600 > baud communications in the United States is the US Robotics > HST. The Telebit has trouble connecting at other speeds from what > I've seen. USR is coming out with major modifications to the HST Of the eleven sites I talk to, exactly ONE has the HST (in addition to Trailblazers), all the others have ONLY Trailblazers. Not a scientific survey, but interesting. My Telebit has no trouble connecting to anything at any speed. -- John Higdon john@zygot ..sun!{apple|cohesive|pacbell}!zygot!john
rja@edison.GE.COM (rja) (02/16/89)
In article <4035@alvin.mcnc.org>, felstein@mcnc.org (Bruce M. Felstein) writes: > I think that you will find that the most used modem for 9600 > baud communications in the United States is the US Robotics > HST. The Telebit has trouble connecting at other speeds from what > I've seen. USR is coming out with major modifications to the HST > very shortly, although I'm not at liberty to say what they are, but > you won't be dissapointed in speed or performance along with the > fact that they will also be V.32 as well as HST compatible. -------------------------------------------------------------------------------- This is ironic. My experience is that a Telebit will talk to any modem at all without problems. The Courier has trouble talking with anything but a Courier at any speed. UNIX/Internet sites overwhelmingly use Telebit; FidoNet overwhelmingly uses Courier HSTs; Hayes 9600V is widely used in PC BBSs other than FidoNet. To claim that the Courier is 'the most used modem' is misleading and possibly inaccurate if one looks at the number of Hayes 9600V modems sold versus the number of HSTs sold. I believe that Hayes has still sold more 9600Vs than there are HSTs. Telebit regularly upgrades its modems and I understand that V.32 compatibility is in the works. I hope that we can avoiding starting another modem fight. The kind of modem one should pick depends largely upon one's application, each has its advantages and disadvantages for specific applications. ______________________________________________________________________________ rja@edison.GE.COM or ...uunet!virginia!edison!rja via Internet (preferable) via uucp (if you must) ______________________________________________________________________________
wrl@wdl1.UUCP (Bill Lewandowski) (02/16/89)
I can not comment on the HST 9600 modem but I can comment on using modems out of the US that were not made for the phone system they are used on. You may find out that the modem will not like the "Dial Tone" it gets down under. I have tried to use modems in W. Germany, Italy, and the UK and I have had to turn on the "X3" option which is "Ignore Dial Tone". Sometimes your call goes through and other times it doesn't. If you have good lines from down under you should be able to do 9600 but I would expect fallback to 2400-1200 but I could be wrong. Bill Lewandowski
albers@ka3ovk.UUCP (me.) (02/17/89)
>Telebits have, as I see it, only *one* disadvantage. They don't conform >to the (technically inferior) V.29 standard or (technically somewhat >equivalent) V.32 standard. ^^^^^ At the Communications Networks '89 Expo, here in Washington, D.C. a couple of weeks ago, Telebit announced the T2500, which is and upgraded TB+ which includes V.32 compatability at 4800 and 9600 bps. It also added remote diagnostics.. Looks nice, and the person I talked to said it would be available in April or May. Jon | Jon Albers, IRS, Computer Services, Site Support and Installation(CS:M:S:P) | | UUCP:...wb3ffv!irsx01!ka3ovk!(root|albers) ARPA: JALBERS@SIMTEL20 | | We are looking for any sites anywhere in the U.S. with Trailblazers for UUCP| | Connections. We can poll you. | -- | Jon Albers, IRS, Computer Services, Site Support and Installation(CS:M:S:P) | | UUCP:...wb3ffv!irsx01!ka3ovk!(root|albers) ARPA: JALBERS@SIMTEL20 | | We are looking for any sites anywhere in the U.S. with Trailblazers for UUCP| | Connections. We can poll you. |
rick@pcrat.UUCP (Rick Richardson) (02/17/89)
In article <13974@bigtex.cactus.org> james@bigtex.cactus.org (James Van Artsdalen) writes: >They already released that modem. Now if only Telebit would release a >PEP/V.32 modem that supports SLIP. With a half price deal, of course... :-) I think they already released *that* modem, too. I threw away the glossy I got last week, but I'm sure it said V.32 on it. No price, and no word of an upgrade kit for Plus owners either. -- Rick Richardson | JetRoff "di"-troff to LaserJet Postprocessor|uunet!pcrat!dry2 PC Research,Inc.| Mail: uunet!pcrat!jetroff; For anon uucp do:|for Dhrystone 2 uunet!pcrat!rick| uucp jetroff!~jetuucp/file_list ~nuucp/. |submission forms. jetroff Wk2200-0300,Sa,Su ACU {2400,PEP} 12013898963 "" \d\r\d ogin: jetuucp
libes@cme.nbs.gov (Don Libes) (02/17/89)
In article <13974@bigtex.cactus.org> james@bigtex.cactus.org (James Van Artsdalen) writes: > ...Now if only Telebit would release a >PEP/V.32 modem that supports SLIP. With a half price deal, of course... :-) Visual Technologies just gave us a demo of their X terminal. It includes SLIP in ROM, which seems to make it ideal for hooking up to a 9600 baud modem from home. Unfortunately, the people demo'ing the unit had the brain of a pea and said they would have to talk to their engineers before admitting this would work. Is anybody interested in this? Done it? Planning to? With what modem? X terminal? Lastly, does any modem manufacture spoof SLIP? (Were you jesting about Telebit, or do you actually know if they are going to do it?) Don Libes libes@cme.nbs.gov ...!uunet!cme-durer!libes
dyer@spdcc.COM (Steve Dyer) (02/18/89)
In article <896@muffin.cme.nbs.gov> libes@cme.nbs.gov (Don Libes) writes: >Lastly, does any modem manufacture spoof SLIP? (Were you jesting >about Telebit, or do you actually know if they are going to do it?) Since IP is a datagram protocol, there really isn't much to 'spoof', ACK-wise (no ACKs), and spoofing TCP would seem to require an arbitrarily large amount of state to spoof every VC that passed through the modem pair. It would also suggest that it would wreak havoc with RTT calculations. Remember that UUCP, [xy]modem and kermit spoofing really depends on the fact that there is a single pseudo-half-duplex protocol providing only one "virtual circuit" between the two Telebits. However, for simple point-to-point set-ups, you could imagine a mode where a lot of the IP header could be dispensed with (though I think host support for this is probably a better idea.) Also, Telebit needs to do some work optimizing its internal packet sizes and turn-around times for connections used for SLIP. This isn't really "spoofing" but it would help. -- Steve Dyer dyer@ursa-major.spdcc.com aka {ima,harvard,rayssd,linus,m2c}!spdcc!dyer dyer@arktouros.mit.edu
smb@ulysses.homer.nj.att.com (Steven M. Bellovin) (02/19/89)
It's easy to do a lot of header prediction code in the link-level driver; most of the packet doesn't change much, especially for TCP ACKs. See, for example, RFC914, Farber, D.J.; Delp, G.; Conte, T.M., ``Thinwire protocol for connecting personal computers to the Internet.'' It is probably better to do that in the host, but doing it (or equivalent) in a Trailblazer modem would help siginificantly.
todonne@topaz.rutgers.edu (Thomas O'Donnell) (02/21/89)
dcs.class.323 n
craig@n8ino.UUCP (R. Craig Peterson ) (02/21/89)
Barring any interface problems I'm very sure I'd use a Telebit. Its amazingly adaptive circuitry allows it to be used over incredibly lossy & lousy phone lines. It gets through all over the world at speeds greater than 8kbps where other modems can't connect, or lose their connections. There was even one site in New Jersey that I couldn't maintain a clean link to at 1200 bps. MNP didn't help much, in fact sometimes it was impossible to get any meaningful data through. The trailblazer just runs along at or near top data rates (>12kbps) without any problems. The purchase of the modems was certainly worth it! -- R. Craig Peterson (N8INO) mcdchg!n8ino!craig craig@n8ino.UUCP