Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!sdd.hp.com!uakari.primate.wisc.edu!aplcen!wb3ffv!ka3ovk!albers From: albers@ka3ovk (Jon Albers) Newsgroups: comp.dcom.modems Subject: Re: Best modem protocol summary? (Correct me if I'm wrong) Message-ID: <1991Jun26.190458.10938@ka3ovk> Date: 26 Jun 91 19:04:58 GMT References: <1099@camco.Celestial.COM> Organization: Internal Revenue Service, Washington, DC Lines: 34 In <1099@camco.Celestial.COM> bill@camco.Celestial.COM (Bill Campbell) writes: >I may well be doing it wrong, but the best data rates I've been >able to get recently using real data (pre-compressed) and V.42bis >modems is about 600cps. This is between a couple of UDSV3242B >modems with interface speed locked at 38,400 on Specialix 8-port >boards. My PEP modems regularly get 1400-1700cps with interface >locked at 19,200. Bill, here's my uutraf stats for a couple of my sites: Remote -----------K-Bytes----------- ----Hours---- --Avg CPS-- --Files-- Host Recv Sent Total Recv Sent Recv Sent Recv Sent ------ --------- --------- --------- ------ ------ ----- ----- ---- ---- wb3ffv 10666.2 2489.5 13155.7 2.7 0.6 1086 1095 130 75 nstar 11270.4 14.2 11284.6 2.4 0.0 1283 2289 136 48 barn 6049.5 1045.7 7095.2 1.4 0.3 1230 1062 32 56 infopro 861.0 1.7 862.7 0.2 0.0 1236 2252 20 6 Note that for small amounts of data, uutraf's numbers don't make sense, but for larger amounts of data, it seems realistic. These are all news feeds, which are 16-bit compressed batches. The site 'nstar' is via V.42/V.42bis. The others are via Trailblazers in PEP mode. I haven't gotten the high rates that larry@nstar has given on the net (1750 cps, I think). The I/O card here is a Digiboard PC/i16, which uses Z80SIOs. Jon -- | Jon Albers, IRS, Information Systems Management, Support and Installation. | | Office Symbols: ISM:S:S:SI voice: (202/FTS)535-3729 Packet: KA3OVK@N4QQ | | UUCP:(media|teemc|tcsc3b2|ki4pv)!ka3ovk!albers ARPA: JALBERS@SIMTEL20 |