[pchelpers] Re: Fw: Your Internet Connection may be Damaged


This is exactly how LZW compression works.

--Scott.

> -----Original Message-----
> From: John Durham
> Sent: Sunday, July 28, 2002 3:19 PM

> I have seen ideas like this before, and was in contact with 
> the development of one some years ago. It's simple enough: 
> Analyze the repeating patterns in online traffic such as 
> words or byte sequences that occur often. Create a dictionary 
> in memory of those patterns and substitute a short code for 
> each one. Then correspond with the modem at the other end of 
> the line to set up the same thing.

> When sending information, these sequences are identified 
> first and short codes are sent instead. In fact, the long 
> repeating sequences never need to be sent again. One code 
> identifies which information to decode at the far end. The 
> longer these sequences, the better the improvement in speed 
> because the time that would have been spent sending them is saved.

> If that's not so easy to follow, just think of it as a clever 
> compression system. It does indeed get better with time, but 
> it has some disadvantages too.

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