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echo: aust_modem
to: Paul Chapman
from: Ray Mcconnell
date: 1996-10-10 15:49:04
subject: Avtek 288 and CPS rates

Hi Paul,

 PC> I've been using an Avtek FlashModem 288 v.34 with the Cooee comms 
 PC> package and want to know what is an acceptable CPS download rate using
 PC> Z-Modem when I've connected at 28800/V34/V42BIS to a host system 
 PC> running Netcom 28.8's (ie Melb PCUG BBS during the morning) about 30km
 PC> from where I live. The Avtek is using the Motorola chipset. 

The expected rates are from 3100-3300 CPS. Off Melbourne PC (on a good day)
I get 3240-3280 CPS when downloading a ZIP file. Unfortunately, the lines
recently have been really pathetic, so I only get 2650-2990 CPS, even on a
28800 connect with V42/V42bis. Have you got error correction enabled, (LAPM/V42)
because above you just have V42bis stated.

 PC> After beginning a typical download, it starts out at 3000+ CPS; after 
 PC> {at}60 seconds and a few CRC errors (say 8), it drops back to {at}1500 CPS 
 PC> then, depending on the file size, mellows out to {at}1300 CPS five
 PC> minutes  and a few more CRC errors later. 

 PC> Is this an acceptable sort of performance? If not any ideas on what I 
 PC> could do to improve it, besides buying a Dynalink :) 
 PC> Any help appreciated. Thanks. 

No, this a shocking transfer speed. If you haven't got any error correction
enabled (on a Rockwell chipset it's done by AT\N3, not sure about a Motorola
chipset though).

cya
... Backup not found: (A)bort (R)etry (S)lap nearest innocent bystander.
___ Blue Wave/DOS v2.30 [NR]

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