> From: [EMAIL PROTECTED] Subject: Re: [PCI] modem speed
At 10:25 AM +0000 06/04/2004, David Elmo wrote:
and you've fallen in to a bad trip.If you look at the bottom bar of some browsers (eg. IE),
Ment to say "bad trap".
>> Now, in a modern city, it is rare for anyone to get much >> more than 5K/sec and certainly not for long. >>City has nothing to do with it.
City has nothing to do with what?
I think you ment that backwards. You're trying to say that the infrastructure in cities is better, so faster speeds may be obtained?.
My point is that city or country makes little diff. A CO is a CO and the wires only go so far from it. If they're noisy, you're screwed - regardless of having pidgeons or cows pirching on them.
( CO = Central Office network switch )
> A decent V.90 connection is a RAW 4 to 5 KB/sec. But when you add V.42's bit
> stripping and V.42bis data compression... much higher througput is easilyattainable --- especially over the web, where much of the traffic is easily compressable ascii text (html, scripts, etc).
When transferring raw binary data, that's mostly uncompressable, you'll see
the throughput rate drop to 20% higher than your raw carrier speed. Why 20%?
Because even tho the V.42bis data compression is defeated, V.42's bit
stripping transmits only 8 bits per byte instead of 10 (no start and stop
bits).
I am interested in this Dan, what to do exactly to get better results than roughly average 3.5k per sec?
First, use a reliable metric. Something like IPNetRouter - that isn't succeptable to your browser's skew.
Next, take a hard look at your phone line. Determine where the noise is - inside your home or outside. Get that clean that up. Eliminating the phone line noise is 90% of the battle. ...Usually to drop brought to homes is more than just one pair of phone wires. This means the telephone company can switch you to an alternate pair quite easily. This can often reduce noise problems (after you've determinate the problem is outside your home).
Outside vs Inside... It's amazing how much noise comes from sources in your own home. Answering machines, fax machines, other telephones, flourescent lights, etc...
This V.42 business, we talking the need to get different modems here?
V.42 Error Correction and V.42bis Data Compression are part of all V.90 modems. But they don't "activate" until the line noise is below an acceptable threshold. See above.
PS. Practical advice: those who have a lot to do on their computers, do some of it while pages load in the background. Have a few things going at once and it is less frustrating. Eg. when checking out Ebay, open up several items in new windows (make them small, up in the corner) and they load up while you are browsing the list of auctions... No offence to those who already do this. It is a habit that is not always acquired even tho it may seem obvious.
I do this a lot. I have both iCab and Mozilla running, each loading perhaps a dozen pages simultaneously - while I'm chatting on IRC or doing email or .... Definately keeps da Mac busy.
- Dan.
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