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- Newsgroups: comp.sys.amiga.datacomm
- Path: sparky!uunet!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!sunic!seunet!pop!bjst
- From: bjst@sth.frontec.se (Bjorn Stenberg)
- Subject: Re: HST & SUpra: which is faster?
- Message-ID: <1992Sep3.191641.21580@sth.frontec.se>
- Nntp-Posting-Host: pop.sth.frontec.se
- Organization: IDK/Frontec, Sweden
- References: <kehlet.06hg@kehlet.adsp.sub.org> <36908@uflorida.cis.ufl.edu>
- Date: 3 Sep 92 19:16:41 GMT
- Lines: 62
-
- In article <36908@uflorida.cis.ufl.edu> jma@reef.cis.ufl.edu (John 'Vlad' Adams) writes:
- > [...]
- > And when using a new
- >16.8k HST, one sees over 2000 CPS to the V.32bis 1600 to 1650 CPS. And
- >as far as transferring mail with my NEC, since my outgoing packet is
- >on the order of 50k to the incoming 800k, well, I think you can figure
- >out the math that the HST is faster in unidirectional transfer than would
- >be an (currently non-existent) Amiga bi-directional mailer protocol that
- >talks to FrontDoor, D'Bridge, or BinkleyTerm.
-
- The HST is in this case about a minute faster, thanks to the great length of
- the incoming file.
-
- In my case, I receive about 200 KB mail from my HUB, and send something like
- 30-50 KB after a busy day.
-
- In MY mail case the HST beats the Supra with something like 2.5 seconds, which
- is quickly eaten up by all the 0.3 second ping-pong line swaps the HST does
- during the EMSI negotiation between my HUB and my BBS.
-
- These mail session examples are cases where there is little or no need for
- bidirectional file transfer, yes.
-
- I have some other examples, though:
-
- * Full screen editors
- =====================
- There's no 'obvious' main line direction when using full screen text editors.
- Sure, as long as I only type I can stay below the 450 bps back-channel HST
- supplies. But as soon as i start moving with the cursor or keep SPACE pressed
- down a little while my HST starts acting really annoying:
-
- 1. I keep CRSR-LEFT pressed to move 40 characters.
- 2. The HST ping-pongs the line to get the 14k4 channel to be my SEND channel.
- 3. All the ANSI escape codes from the remote BBS is sent back. That's more
- than 450 bps...
- 4. One more ping-pong, to allow the reception of the ANSI control codes.
- 5. I move around a little in the editor again.
- 6. More ping-ponging...
-
- This sounds like a joke, but it's not, it's darned annoying that's what it is!
-
- * Networks
- ==========
- At work, we use (among other things) a V.32bis to allow remote workstations to
- connect to our local network.
- All of us use X-Windows (with different user interfaces on top) our our SUNs.
- The X system sure likes to send a lot more than 450bps in both directions
- simultaneously... We've actually tested using a 16k8 HST instead of our V.32bis
- but our most frequent remote users (of course also supplied with HSTs)
- complained so much we had to change back to the 'slower' V.32bis.
-
-
- If you look at a little more than ONE single case of usage, you will quickly
- find out that those extra 2400 bps in one direction are simply not an argument
- for the missing 13950 bps in the other...
-
- -- Bjorn
- /// Bjorn Stenberg, Stockholm, Sweden bjst@sth.frontec.se
- /// main() { printf(&unix["\021%six\012\0"],(unix)["have"]+"fun"-0x60);}
- \\\ /// "- Your documentation no longer confuses me, old version!"
- \\X// -- Lord Vadic, Dec Wars
-