home *** CD-ROM | disk | FTP | other *** search
- Path: nntp.teleport.com!usenet
- From: curt@teleport.com (Curt...)
- Newsgroups: comp.dcom.modems
- Subject: Re: Anything above 28.8kbs is bosh!
- Date: Wed, 03 Jan 1996 07:13:59 GMT
- Organization: Teleport - Portland's Public Access (503) 220-1016
- Message-ID: <30ea2b85.7982743@news.teleport.com>
- References: <4c994e$nsm@dub-news-svc-1.compuserve.com> <4casgm$27f@gidora.kralizec.net.au>
- NNTP-Posting-Host: ip-pdx19-26.teleport.com
- X-Newsreader: Forte Agent .99c/16.141
-
- Carl Renneberg <renneber@tmx.mhs.oz.au> wrote:
-
- > 101321.2700@compuserve.com (Markus Hansmair) wrote:
- > >Save your money and your nerves! Forget about purchasing a new modem or
- > >updating your old one to get more than 28.8 kbs.
- > >
- > >Transmission modes with more than 28.8 kbs are achieved by simply
- > >increasing the symbol rate.
-
- > Is that correct? How does that sit with the experience reported by many
- > people in this newsgroup, that a V.34+ modem achieves higher line rates
- > than a V.34 modem, even on lines that don't allow a full-speed V.34
- > connection?
- >
- > An increased symbol rate requires more bandwidth: if the bandwidth was
- > available to begin with, you'd expect the V.34 modems to reach full
- > speed, yes?
- >
- > Does anyone here know how V.34+ does achieve better thoughput on
- > impaired lines (say, bandwidth restricted to 3000 Hz)? Does V.34+ get
- > more bits per symbol? Are the modems' equalizing receive filters and
- > echo cancellers more effective?
-
- Here is a bit of the USR press release that mentions increased through-
- put al all connection rates, and gives a hint why:
-
- ====================================================================
- U.S. ROBOTICS ANNOUNCES 33.6 KBPS V.34 SOFTWARE FOR SPORTSTER
-
- "Our 33.6 software offers two major advantages," noted Michael Seedman, vice
- president and general manager of the Personal Communications Division. "Not
- only is the top possible speed boosted to 33.6, but the overall throughput is
- significantly increased. Not all phone lines will support 33.6 Kbps, of course; but
- our lab tests indicate the average connection between two U.S. Robotics products
- running the new software will consistently be 2,400 to 4,800 bits per second faster
- than older versions of the V.34 code," Seedman noted.
-
- "For example, on a connection where a customer might typically experience 26,400
- bps, it's likely the new software will allow a connection at 28,800 bps on a regular
- basis," Seedman added. "We achieved this increase by tuning our algorithms to
- support the higher speeds offered by the enhanced V.34 standard. By pushing the
- barrier of higher speeds, we're able to provide a dividend of faster connections across
- the entire spectrum of speeds available with V.34."
-
- The 33.6 software is included in all newly shipping Sportster desktop products. An
- EPROM chip replacement containing the new 33.6 software will also be available for
- owners of current V.34 Sportsters to upgrade their modems. Customers can order
- the V.34 upgrade chip for $24.95 plus shipping by contacting U.S. Robotics customer
- support.
- =========================================================================
-
- Best wishes,
- Curt...
-
-
-
-
-
- _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
- Curt's High Speed Modem Page:
- http://www.teleport.com/~curt/modems.html
- _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
-