On Mon, Dec 18, 2000, Omer Zak wrote about "You forgot about videophones (useful for
the deaf among us)! (was: Re: adsl)":
>
> VIDEOPHONES! VIDEOPHONES!! VIDEOPHONES!!! VIDEOPHONES!!!!
> They need at least 384Kbps in each direction to provide high quality
> pictures.
Correct me if I'm wrong, but doesn't *DSL technology allows for a fixed
*total* bandwidth, and it is up to the implementation to decide how much
bandwidth it reserves for each direction? The 64kbps choice was probably made
because typical users don't send much upstream (forget about videophones for
a moment...) and reserving, say 500mbps for upstream will mean that most of that
bandwidth will be wasted. So why can't Bezek give some of the users DSL lines
with a different bandwidth division? Please correct me if I have made wrong
assumptions.
There may be a more sinister explanation for the asymetric nature of ADSL:
typical users will not sit by the computer 24/7 downloading stuff. However,
if their computer is connected all the time, it's easy to set up a server
that serves files 24/7, potentially using huge amounts of bandwidth. So by
limiting the upstream bandwidth, they limit the amount of bandwidth you can
se up!
And another question? I know that videophones over ISDN exist for many years
now. Does that mean that 128kbps is maybe enough for a videophone? Or does
that mean the image will be too small or too fuzzy to read lips, or something?
--
Nadav Har'El | Monday, Dec 18 2000, 21 Kislev 5761
[EMAIL PROTECTED] |-----------------------------------------
Phone: +972-53-245868, ICQ 13349191 |Take my advice, I don't use it anyway.
http://nadav.harel.org.il |
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