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- Path: sdd.hp.com!inn
- From: Jeff Grimmett <jgrimm@sdd.hp.com>
- Newsgroups: comp.sys.amiga.misc,comp.sys.amiga.hardware,comp.sys.amiga.applications
- Subject: Re: Modem disconnecting
- Date: 10 Jan 1996 17:41:06 GMT
- Organization: Hewlett-Packard Company
- Message-ID: <4d0tni$bt1@news.sdd.hp.com>
- References: <1373.6578T735T2832@midland.co.nz> <4cmrrq$q7r@guava.epix.net> <4cv2s5$2lk@news2.delphi.com>
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-
- jdow@BIX.com (Joanne Dow) wrote:
-
- >>What brand of modem are you using and what brand is your ISP
- >>using? Most likely your ISP is using US Robotics (USR). I use a
- >>Supra V34 modem while my ISP is using USR modems. I had a
- >>similar problem until Supra updated their FLASHROM code to
- >>help the Supra make, and keep, connections with the
- >>bastardized USR modem protocols. :-) I'd suggest following
- >>up on this as a possible cause.
- >
- >Ehhhh - before you make comments like that read up on the Rockwell modem chips
- >and general modem performance. In formal testing the USRs outperform the Supras
- >for connection reliability and compatibility by a noticeable margin. I have used
- >a USR Courier v.everything at full speed under conditions that severely
- >compromise the Supra 19.2kbps performance. (The Supra spends so much time
- >retraining with its little front panel light declaring 19.2 that effective
- >communications are in the 4800bps class.)
- >
- >I have also tried a Supra, a Practical Peripherals, and a Sportster on a link
- >that I consider one of the nastiest modem challenges in the known universe, the
- >INMARSAT-B mobile satcom link. (It uses 9600bps compressed speech for the voice
- >channels.) The Sportster managed to maintain and hold 2400bps connections. It
- >DID retrain alot. But it managed. The Supra and the Practical Peripherals either
- >could not establish a link at any speed or could not hold it any useable period
- >of time.
-
- Personal experiences are one thing; empirical results are something else
- again. Every SERIOUS comparison I have seen of the 28.8 crowd of modems
- has placed USR and Supra dead even in overall performance. Supra excelled
- in some categories, USR in others. What is VASTLY entertaining about
- this is that BOTH place consistently in the bottom third overall, with
- ZyXel and Practical usually battling it out in the top of the lists.
-
- These are tests done under labratory conditions using test equipment
- designed to bring out the worst in a modem. If you're familiar with
- terms like TAS (and I don't mean the WB character, either :-) then you
- have some idea of what they usually put them through.
-
- A good example is a recent evaluation of over 25 modems done by Byte. I
- will add the caveat here that it does not appear that they considered the
- top of the line modems to be worthwhile candidates, but considering that
- you can't GET them off the shelves at Computer City, I suppose they were
- playing to thier audience.
-
- Hey... USR's work for YOU. For me, they ain't worth the extra cabbage.
- For others, they're a nightmare :-)
-
-
-