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- Path: hal.COM!elvey
- From: elvey@hal.COM (Dwight Elvey)
- Newsgroups: comp.dcom.modems
- Subject: Re: Astounding high CPS rate!
- Date: 11 Jan 1996 20:41:52 GMT
- Organization: HAL Computer Systems, Inc.
- Distribution: world
- Message-ID: <4d3smg$cbi@news.hal.com>
- References: <4cvsii$h0@horus.infinet.com>
- NNTP-Posting-Host: civic.hal.com
-
- In article <4cvsii$h0@horus.infinet.com>, armhead@infinet.com (Bob Selfinger) writes:
- |> I have recently gotten a series of very high CPS dl's
- |> on 14.4 ZMODEM of ZIP files.
- |>
- |> Now, I have been suffering from line noise, (I need to
- |> get down to the basement and re-route a phone line which
- |> I installed paralell to electric wiring - duuugh, I thought
- |> that was OK at the time). I have been getting 1000 - 1300
- |> because of the noise. I used to get about 1620 or so
- |> before the line noise started.
- |>
- |> I have just gotten some dl's in the range of 1800-2100!
- |> I never got that, even before the noise. It is not the files
- |> being compressable or anything like that. They were all zip
- |> files from various sources.
- |>
- |> Here is the thing... I was going between two PC's, each on a
- |> separate phone line in the same house. Now, a severely
- |> uninformed person might have predicted this - Hey, there is
- |> only a short distance to go! But I know (or thought I knew!)
- |> that this would not make any difference - the call still has
- |> to go all the way to the phone office and then back, and these
- |> two phone lines are each on different exchanges from each other.
- |> I just don't see why this should have worked so well. Both
- |> lines are noisey. I was expecting 1000-1300 CPS as usual.
- |> I am stumped. Both PC's are still getting 1000-1300 on dl's
- |> from BBS's. What is happening here?
- |> --
- |> =========================================>
- |> Bob Selfinger
- |> armhead@infinet.com
- |> =======================>
- |>
-
- Hi
- Several factors are involved in the CPS of a connection. The
- connect speed is only one part of a hole string of potentially
- weak links. The BBS disk speed, processor and software are part
- of the equation as well. Many BBS's have multiple lines going
- into the same machine. This can also slow things down. Much
- of the software that BBS people are using was written and optimized
- for 9600 baud connections. On top of this, you probably have your
- modems set for v.42bis. Depending on the modems ability to recognize
- compressed data, this can slow transfers. Remember its the sending
- end that desides this. Add all the variables up and you'll see
- that there is a variation. It is even possible that the connect
- speed isn't 14.4 when you talking to the BBS. Different modems
- seem to report this differently.
- Dwight
- ( PS I typically get ~1800 CPS with a 14.4K modem on transfers of
- compressed files and have seen 2400 CPS with text file and
- v.42bis )
-