elric@csustan.UUCP (Elric of Imrryr) (01/01/87)
Has anyone here had any experiences with the USR Robotics
2400 baud external modem? I am considering the purchase of one from
Softline in NY, since the have them for $189. (Which seems to be
a good deal, so I'm try to find the catch...)
Brad Falk
--
elric Lunatic Labs @ Csustan {lll-crg,lll-lcc}!csustan!elric
cryptography, terrorist, DES, drugs, cipher, secret, decode, AUTOVON
NSA, CIA, NRO, KGB, GRU, Mossad, Libyan Hit Squad, assassination, OSI.
The above is food for the Intelligence Agencies of the World.elric@csustan.UUCP (Elric of Imrryr) (01/05/87)
In article <369@csustan.UUCP> I write: > Has anyone here had any experiences with the USR Robotics >2400 baud external modem? I am considering the purchase of one from >Softline in NY, since the have them for $189. (Which seems to be >a good deal, so I'm try to find the catch...) > Brad Falk A summery of what I got: I got about ten replies, they all said that for $189 the USR Robotic's modem is a great deal. One person said that it is a bit senstive to line noise at 2400 baud. Unfortunatly, Softline only sells the internal (IBM) version. So I will not be getting one. If anyone is interested in contacting them, their number is: 800-221-1260 (in NY 718-438-6057). As with all mail order companies, beware, I've heard nothing about them one way or the other. Brad -- elric Lunatic Labs @ Csustan {lll-crg,lll-lcc}!csustan!elric Selling DES information to Iran, thru CIA secret banks. Ask to take a urine test? "Just say NO!" 23 FNORD 23 ERIS 23 DISCORDIA 23
guest@ucsfcgl.UUCP (guest account) (01/10/87)
In article <369@csustan.UUCP>, elric@csustan.UUCP (Elric of Imrryr) writes: > > Has anyone here had any experiences with the USR Robotics > 2400 baud external modem? I am considering the purchase of one from > Softline in NY, since the have them for $189. (Which seems to be > a good deal, so I'm try to find the catch...) Time to post this again: Any criticisms of the USR Courier 2400 which do not report the revision level should be treated with suspicion. The manual gives instructions for getting the modem to report the level. The original Courier 2400 units were shipped (I got 4) with level 240 (i.e. 2400 bps, revision 0) ROMs. These were pretty bad. Shame on USR. They didn't stop there and produced new ROMs which produced what I estimate to be a two order of magnitude improvement in their performance (error rate, connection reliability etc.) in my environment. The revision current when I last checked was 243. These were supplied FREE to owners of the older units (they asked for return of the old ROMs -- seems reasonable). Hoorah for USR. These units have been in operation with the revised ROMs for enough months now that I have lost count. No problems with them during this period. They are in use on a variety of terminals and micros. There is a caveat for these; they are designed to be used with a device like a computer or terminal. Some front end systems (multiplexors, port selectors) that were designed before the current generation of modems may not handle these or similar modems well. I presume the reason you are seeing such a spectacular buy on these is that USR recently announced the 2400e which has the MNP error correction protocol handler built-in. Terminology Note: You quickly mark yourself as a neophyte in data communication if you refer to the Courier 2400 as a 2400 baud modem. Similarly the 212 type modems are not 1200 baud; they code two bits in each signal element (four allowed states) and thereby achieve a 1200 bit-per-second data rate at 600 baud, i.e. 600 signal-states- per-second on the line. The data rate (bits-per-second) only equals the signaling rate (baud, signal-states-per-second) when each state encodes a single bit, i.e. two allowed states. Thos Sumner (thos@cca.ucsf.edu) (The I.G.) (...ucbvax!ucsfcgl!cca.ucsf!thos) When ideas fail, words come in very handy. -- Goethe (via L. Creighton) When ideas fail, computations come in very handy. -- Sumner (via USENET) #include <disclaimer.std>