das@Apple.COM (David Shayer) (09/14/90)
I'm going to be buying 2 9600 bps modems, so my partner and I can send files back and forth. I want to get data compression, but most companies seem to offer V.42bis OR MNP5. Which is better? Which one is the world going to go? I don't want to buy the system that is going to obsolete next year. I would also welcome any advice on which modem to get. I'm currently looking at the Intel 9600EX, which has V.42 and V.42bis. The list is $819, but mail order its only $549. Any help would be appreciated. David
an12280@mdaali.cancer.utexas.edu (David Gutierrez) (09/14/90)
In article <44782@apple.Apple.COM> das@Apple.COM (David Shayer) writes: > I'm going to be buying 2 9600 bps modems, so my partner and > I can send files back and forth. I want to get data compression, > but most companies seem to offer V.42bis OR MNP5. Which is > better? Which one is the world going to go? I don't want > to buy the system that is going to obsolete next year. We got a pair of Hayes Ultra Smartmodem 9600 modems for about $800 each from Dr. Mac in Sherman Oaks, CA (check MacWorld for their ad). These modems offer V.42bis *and* MNP5 (it says here). If you do order from them, be careful that you get the *Ultra* version. The sales people just see cardboard boxes. David Gutierrez an12280@mdaali.cancer.utexas.edu "Only fools are positive." - Moe Howard
newbery@rata.vuw.ac.nz (Michael Newbery) (09/17/90)
X.42bis includes MNP5 as a subset. Any implementation confirming to X.42bis *has* to also support MNP5. Similarly for X.42, which includes MNP3 as a subset. Conclusion: get X.42bis. -- Michael Newbery<newbery@rata.vuw.ac.nz> Ah! I see you have the mind that goes "ping!"
russotto@eng.umd.edu (Matthew T. Russotto) (09/18/90)
In article <4106@lib.tmc.edu> an12280@mdaali.cancer.utexas.edu (David Gutierrez) writes: >In article <44782@apple.Apple.COM> das@Apple.COM (David Shayer) writes: >> I'm going to be buying 2 9600 bps modems, so my partner and >> I can send files back and forth. I want to get data compression, >> but most companies seem to offer V.42bis OR MNP5. Which is >> better? Which one is the world going to go? I don't want >> to buy the system that is going to obsolete next year. > >We got a pair of Hayes Ultra Smartmodem 9600 modems for about $800 each >from Dr. Mac in Sherman Oaks, CA (check MacWorld for their ad). These >modems offer V.42bis *and* MNP5 (it says here). If you do order from them, >be careful that you get the *Ultra* version. The sales people just see >cardboard boxes. The latest version of USR's Dual Standard also has V.42bis (in V.32 mode only, I believe) and MNP5 (in either HST or V.32 mode). If all you need is V.32, go for the cheaper one. However, if you are only transferring files in one direction at a time (i.e. send one file to him, then he sends one file to you, etc-- not two files being sent simultaneously), then the HST offers faster speeds-- up to 14,400 bps, nominally (before compression). And if you get the Dual Standard, you will still be compatible with The Rest Of The World with V.32. -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu .sig under construction, like the rest of this campus.
laird@slum.MV.COM (Laird Heal) (09/18/90)
In article <44782@apple.Apple.COM>, das@Apple.COM (David Shayer) writes: >I'm going to be buying 2 9600 bps modems, so my partner and >I can send files back and forth. I want to get data compression, >but most companies seem to offer V.42bis OR MNP5. Which is >better? Which one is the world going to go? I don't want >to buy the system that is going to obsolete next year. V.42/bis is better by far than MNP 5. Sorry, but I do not have any real-world figures to quote. I have some comp.dcom.modems articles saved off, and if you want to see them, send me mail. >I would also welcome any advice on which modem to get. >I'm currently looking at the Intel 9600EX, which has V.42 and >V.42bis. The list is $819, but mail order its only $549. vvvv vvvv Let me caution you to look harder for V.32 than V.42. V.32 describes how the data is sent down the wire. I mean, compressing the data is one thing, sending and receiving is another. V.32 is a full-duplex mechanism (both ways at 9600bps per). There are other 'ping-pong' implementations. These are for transfers mostly in one direction at a time. Telebits have PEP, with 19.2kbps the nominal transfer rate. US Robotics has HST, now at 14.4kbps, and there are others like V.29 going one way at at time at 9600bps. My US Robotics HST-DS has V.32 and HST modulation. It worked well for calling bulletin boards. Maya had a good price, too. Compressed data often transfers at 16.6kbps, as if the HST modems 'play hooky' and drop the start-stop bits. I never timed any (MNP 5) text transfers, I just zoomed the window in as far as I could so my Portable could keep up. I now have the V.42 upgrade kit, but the only V.42 modem I can call is a Hayes, which must be the most incompatible high-speed modems around. Even a Telebit connects decently at 1200-2400, but those V-series Hayes are trouble even to connect to! Shucks. Then again, folks that do have a V-series Hayes just won't use anything else... Telebits are reported to deliver reliable 12k-14kbps on voice-grade lines. Ask your uucp administrator. Yesterday my news feed at 2400bps took six hours on my HST-DS, so getting a Telebit is on my mind. >Any help would be appreciated. - Telebits handle line noise exceptionally well, but turnaround is said to be poor for interactive sessions at high-speed. They also have protocol spoofing, which I will not go into here. - The US Robotics HST has a great real-world transfer rate when the lines are clean and is also better interactively, "due to more bandwidth on the back-channel", or so it is said. - Both of the above are 'ping-pong' half-duplex modems where the direction of high-speed transmission is allocated according to requirements. You might desire two-way transmission, as for Async AppleTalk or SLIP, and that means using V.32 modulation. I have redirected followups to comp.dcom.modems, where this topic belongs. -- Laird Heal laird@slum.MV.COM Talk is cheap. (Salem, NH) +1 603 898 1406 Whiskey costs money.
an12280@mdaali.cancer.utexas.edu (David Gutierrez) (09/18/90)
In article <1990Sep17.174250.23448@eng.umd.edu> russotto@eng.umd.edu (Matthew T. Russotto) writes: > The latest version of USR's Dual Standard also has V.42bis (in V.32 mode only, > I believe) and MNP5 (in either HST or V.32 mode). If all you need is V.32, > go for the cheaper one. However, if you are only transferring files in > one direction at a time (i.e. send one file to him, then he sends one file to > you, etc-- not two files being sent simultaneously), then the HST offers faster > speeds-- up to 14,400 bps, nominally (before compression). And if you get > the Dual Standard, you will still be compatible with The Rest Of The World with V.32. The reason we bought the Hayes Ultra 9600 modems is that when talking to like-minded modems (V.32, V.42, V.42bis) they can transfer at 38,400 bps, not 9600. Of course, I only got to play with them for two days, then we had to put them on my section chief's Sun and PS/2. Again, the warning: make sure you specify the *Ultra* Smartmodem. Hayes also sells the "not really V.32, but we're going to call it V.32 anyway" modem that uses proprietary Hayes protocols incompatible with the actual V.32 standard. On the other hand, the latest MacWeek (11 Sept., p.14) says that Intel is introducing a similar modem that *retails* for $819. If you can wait a couple of weeks until they're readily available, I'll bet you can get a really good deal on a pair of those. David Gutierrez an12280@mdaali.cancer.utexas.edu "Only fools are positive." - Moe Howard
blood@aludra.usc.edu (Brian Blood) (09/25/90)
From blood Mon Sep 24 20:19:03 1990 To: /home/chaph9/blood/.article The modem I would suggest is the Hayers Ultra Smartmodem 9600 which supports just about every sdtandard there is a known to man. It really doesn't matter that much which one (v42bis or MNP5) (IMHO) if the main thing you are going to do is trandsfer files between the two of you. Both standards are supported by lots of diiferernt wait, rented fingers...... different modems. Most of your mainstreeanmn modems support v42bis but lots support MNP5. The Hayes Ultra is around 799$799 if you look in the right places. I am not an expert, just relying on my experiences with BBS's and my job.-->supporting Appletalk network via modem. BYE. BYE. Bri.