home *** CD-ROM | disk | FTP | other *** search
- Path: nntp.crl.com!usenet
- From: joewald@crl.com (Joseph Waldvogel)
- Newsgroups: comp.dcom.modems
- Subject: Re: To V42Bis or not to V42Bis??
- Date: 3 Feb 1996 03:38:28 GMT
- Organization: CRL Dialup Internet Access
- Message-ID: <1518.6606T1064T2337@crl.com>
- References: <4etjse$a0g@azure.acsu.buffalo.edu>
- NNTP-Posting-Host: crl4.crl.com
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
-
-
- >Ed Starry (estarry@oro.net) wrote:
- >: simhon@mbnet.mb.ca (Simon Hon) wrote about {To V42Bis or not to V42Bis??}
- >: in
- >: 'comp.dcom.modems'...
-
- >: ~Should I have V42bis on or off?
-
- >: On!
- >: ==================================
- >: ~ I find that at 28.8 connections I get faster CPS rates with it off.
- >: ~ Does this make any sense?
-
- >: Yes. With compression 'Off' the data stream is slow enough to cross
- the
- >: serial port without errors. With compression 'On' the extra amount of data
- >: that's decompressed within your modem is too much for the serial port to
- >: handle, there are errors and retries are necessary. Retries slow down CPS
- >: rates.
-
- >I think what you're trying to say is, with compression on, and while
- >you're transferring pre-compressed files, it will do you no
- >good. Compressed files are notrious for not compressing very well. In
- >fact, the extra overhead involved in compressing files can slow down
- >your throughput.
-
- >It has nothing to do with serial port speed.
-
- Unlike MNP-5, V.42BIS is quite SMART! You can always just leave it on, I'll
- only commpress files that arn't already commpressed. If there commpressed,
- V.42bis is Smart enough to leave them as they are. MNP-5 Data commpression
- is pretty stuppied Your better off to leave THAT off! I don't know about ALL
- modems, but USR modems you can Enable V.42bis Data commpression while leaving
- the MNP-5 Data commpression OFF. Leaving V.42bis OFF will NOT speed up
- Downloading of Commpressed files, thats only true with MNP-5.
-
-