home *** CD-ROM | disk | FTP | other *** search
- 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: 20 Jan 1996 17:13:33 GMT
- Organization: Hewlett-Packard Company
- Message-ID: <4dr7rt$8p9@news.sdd.hp.com>
- References: <1373.6578T735T2832@midland.co.nz> <4cmrrq$q7r@guava.epix.net> <4cv2s5$2lk@news2.delphi.com> <4d0tni$bt1@news.sdd.hp.com> <4d4l0o$2gd@news2.delphi.com> <4d63sm$j6a@news.sdd.hp.com> <4dpueu$j40@news2.delphi.com>
- NNTP-Posting-Host: hpsdv330.sdd.hp.com
- Mime-Version: 1.0
- Content-Type: text/plain; charset=us-ascii
- Content-Transfer-Encoding: 7bit
- X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
-
- jdow@BIX.com (Joanne Dow) wrote:
- >In article <4d63sm$j6a@news.sdd.hp.com>, Jeff Grimmett <jgrimm@sdd.hp.com> wrote:
-
- >Comments made privately to me by a fellow who owns a testing lab and the several
- >months ago review of the cheaper 28.8kbps modems that appeared in Computer
- >Shopper are the things that I base comments upon.
-
- I guess we travel slightly different circles, then :-) Related to this:
- I just stumbled upon an omnibus review of 30 modems on c|net's online
- service (page? BBS? whatever...). There are elements of BOTH our
- opinions within. Overall: Supra == OK, but the manual stinks (I wonder
- if they got a different manual than I did). Practical Periphs: NO WAY!!.
- Motorola: "Buy it" if you can't afford the very best. They almost
- embarassed themselves fawning over the USR Courier v.Everything (note to
- myself: check sponsers list).
-
- Anyway, what I found interesting was that the Sportster was not included
- in this review, at all. They had several models from other
- manufacturers, but not from USR. And Zyxel (which, well, you have to
- read it yourself. I'm not sure if they liked it or not!)
-
- > (The 14.4 beasties are
- >COMPLETELY different from the 28.8 in most cases when compariing quality.)
-
- Hooboy, you better believe it. More mature hardware == really
- cost-reduced. Everything that CAN be pulled out of it IS pulled out of
- it.
-
- >>I have found is that of the three in question, both the USR and PP
- >>immediately started degrading, to the point that they were useless to me
- >>after three months (again, I have tight tolerances). The Supra was
- >>degrading, too, but not as fast. Unfortunately, it got tossed for other
- >>reasons (the case acts like a waveguide...)
-
- >Hm, I do have a PP 9600SA here that worked for me very nicely for many months
- >and then began to deteriorate. I traced it down to an electrolytic capacitor
- >that was going bad. I replaced it with a good capacitor and the modem has worked
- >sort of adequately since then. I wonder if this is becoming an endemic problem
- >in the modem industry. (Someone else with a similar model PP reported back to me
- >that his had the same capacitor problem. Sample of two - but it seems
- >indicative. Failure mode was increasing difficulty making connections over a
- >several month period - as if the lines got progressively noisier.)
-
- Overall, the primary failure mechanisms are: light corrosion (just a
- film) on sheet metal contacts, loosening of fasteners. Since they tend
- to economize on return paths for signals a lot these days (gone are the
- days of almost solid copper backplanes), this manifests itself in a lot
- of ways. I'm in a unique position to catch this early, but other people
- may notice a few less successful connects, dropped carriers, etc, that
- make no sense. Actual components don't generally (note that word) start
- degrading for at least a year, unless they get a bad batch (it happens a
- lot). When they do, caps and resistors (especially non-precision ones)
- are the worst offenders. The heavier, beefier resistors tend to wear
- first, as they are generally only used where more current capacity is
- required, and tend to get quite warm in comparison to the other
- components.
-
- >>>Meanwhile comp.dcom.modems is an interesting newsgroup.
- >>
- >>For some reason I haven't seen any traffic in there since connecting.
- >>What's the daily average?
- >
- >It was up in the several hundred messages a day range when I was following it.
-
- When I first got on the 'net, that was the case, but I was in a different
- domain (ncr.com -- yeah, I know). Alas, fixing this is not on the
- priority list here for a lot of people (oddly enough, since potential
- feedback on our products might be out there).
-
-
-