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- Path: sobt.accessorl.net!user
- From: eric@accessorl.net (Eric Shaw)
- Newsgroups: comp.sys.mac.comm,comp.dcom.modems
- Subject: Re: faster than 28.8
- Date: Thu, 01 Feb 1996 00:11:57 -0500
- Organization: Access Orlando
- Message-ID: <eric-0102960011580001@sobt.accessorl.net>
- References: <sumner-2001961038000001@sumner.tiac.net> <4ds0fp$4ap4@news-s01.ny.us.ibm.net> <AD29910A96685C7229@asd-stat13-153.dial.xs4all.nl> <bgrubb-2301960739100001@10.0.2.15> <4e3lbi$r3m@brachio.zrz.TU-Berlin.DE> <eric-2601960120540001@sobt.accessorl.net> <DM0A30.1x@giskard.demon.co.uk>
- NNTP-Posting-Host: sobt.accessorl.net
-
- In article <DM0A30.1x@giskard.demon.co.uk>, dale@giskard.demon.co.uk (Dale
- Shuttleworth) wrote:
-
- >The theoretical maximum is well over 50:1. I assume the USR you
- >refer to is not US Robotics of Skokie, Illinois, USA but some
- >other inferior brand. Both my V34 Courier and V32bis Sportster
- >can easily achieve *well* over 3:1 on a file of all zeros.
-
- Yes, that would be the US Robotics to which I refer. Perhaps they can get
- this 3:1 compression ratio at 14.4Kbps, but the ones we have here do not
- achieve this ratio when connected at 28.8 or 33.6. When directly
- connected, sending a ridiculously compressible file (PKZip gets over
- 1000:1), they achieve slightly over 6K/s. I believe this to be due to the
- speed of the processor in them (waiting for it to compress), in which case
- they would still be around 6K/s on a 14.4Kbps connection (around a 4:1
- ratio), but I haven't tried locking the USR's at 14.4 yet, so I don't know
- for sure. At 28.8, this is not even a 3:1 ratio.
-