Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!samsung!gem.mps.ohio-state.edu!apple!cambridge.apple.com!spt!kimbal!rick From: rick@kimbal.lynn.ma.us (Rick Kimball) Newsgroups: comp.dcom.modems Subject: Summary: Do T2500 using V.32 talk to anything else. Message-ID: <1074@kimbal.lynn.ma.us> Date: 23 Nov 89 13:50:20 GMT Distribution: na Organization: Personal USENET Site, Lynn, MA (617) 599-8864 Lines: 93 Summary: I decide to spend the extra money on the T2500 because there are a bunch of US Robotic Dual Standard BBS around here. I want to be able to connect to them. In addition, I get the gut feeling that upgrades for the T2500 will be more available than for the TB+. Thanks to the following people for responding: casey%gauss.llnl.gov@lll-crg.llnl.gov (Casey Leedom) faatcrl!jimb@gvlv2.gvl.unisys.com (Jim Burwell) "Mark Solsman" Mark A. Verber cca.ucsf.edu!wet!tempest@cgl.ucsf.edu Rick Kimball INTERNET: rick@kimbal.lynn.ma.us UUCP: ...!spdcc!kimbal!rick, ...!spt!kimbal!rick Personal USENET Site POTS: (617) 599-8864 | I'm trying to decide between a TB+ and a T2500. Is it worth it to spend | the extra money on the T2500. All the sites I communicate with at | present use TB+. The traffic is mainly UUCP with occasional terminal | connections. Thats what TB+s (and T2500s) are best at. PEP/UUCP g spoofing is a great combo. First, it should be noted that the price difference between a TB+ and a T2500 is really getting small (I'm speaking of actual prices you would pay after shopping around - not list prices). If your traffic is all UUCP, then you really don't need a V.32 modem. PEP will give you much better performance with UUCP spoofing. The packetizing delay on a V.32 with MNP will really hurt your UUCP performance. If you do [visually] interactive work as well, I think you should seriously consider the extra cost of getting a T2500. V.32 doesn't have the funky echo delay of PEP. Most of the time the PEP echo delay won't bother you if you're just typing something in, but if you're doing anything that requires hand eye coordination, it's a real mess. I would go for the extra to get a t2500, I did. V.32 will be much more standard than PEP. I expect that v.32 modems will be about as common as v.22 (2400 baud) in five years. A number of the commercial services are looking into installing v.32 modems. V.32 is also nice because it is full duplex 9600 baud. Things like SLIP are very usable on V.32 modems, and teribble under PEP right now. | What are the advantages and disadvantges to V.32? V.32 is slower than PEP. It NEEDS (at least on our phone system) MNP turned on to get a noisless connection (doesn't suprise me at all. PEP must do EC also). The advantage is that it's now a "common denominator" for the major high speed modems (USR HST DS, Microcom V.32, Hayes V.32, Telebit, etc). V.32 is a full duplex protocol at 9600bps. You wouldn't get propagation delays like you would get from a PEP or HST modem. It's only 9600bps, so throughput wouldn't be as good as PEP. Interactive use would be superior, however. PEP is a much more elegant protocol than HSTs. It breaks up the phone line into 511 "channels" or band, on different frequencies, and uses AM to squeeze as many bits down each channel (in paralell) per baud as possible (up to 9 bpb! ). You can get about 1800 CPS on a good line. HSTs DO do better on a nice clean phone line, but PEP kills HST when there is line noise. (PEP is the most robust modem-modem protocol I've seen. Nothing short of disconnecting stops it from transfering! ). . | Will [V.32] be superseded by something else. It already is. V.42 is out. USR HST DS users will have chip upgrades RSN. Telebit T2500 users will also get V.42 chips with the next ROM releases. Along these lines I really like Telebit because they've proven that they're committed to leading in this field and willing to offer customers upgrade paths - usually at fairly reasonable cost. | Can a T2500 using V.32 talk to a US Robotics or Hayes? Only if the USR in question is a Dual Standard or V.32. Not sure about Hayes, but I'm pretty certain it won't work on a V-Series. Hayes did something weird and it's not fully V.32 compliant. Right now, I think Telebit makes the best modems for Unix users. T2500s are really nice. I must say that I haven't played with HST Dual Standards yet. The older HSTs didn't have UUCP 'g' spoofing, which practically makes it impossible to use with UUCP. Newer ones now have spoofing.