|
Posted by Eric on August 12, 2006, 1:00 pm
If you were Registered and logged in, you could reply and use other advanced thread options
> Standards for DOCSIS 3 have been released. It now has a maximum
> downstream rate of 160Mbs (up from 40Mbs) and upstream of 120Mbs (up
> from 30Mbs). Those are in bits. In bytes, those are speeds up to 20MB
> down and 15MB up. (Something seems odd, as I think the current
> downstream actually goes to 12 or 16MB down, or 96-128Mb?)
>
> http://arstechnica.com/news.ars/post/20060808-7450.html
>
> --
> If there is a no_junk in my address, please REMOVE it before replying!
> All junk mail senders will be prosecuted to the fullest extent of the
> law!!
> http://home.att.net/~andyross
You're getting bits and bytes confused. Just about every telecom spec
I've ever seen refers to bits/s, not bytes. Also, the speeds refered
are typically the "wire speed," so typically your throughput will not
be the same as what is advertised (due to things like frame headers and
checksums).
The big advantage of DOCSIS 3 is channel bonding (that will allow for
much more bandwidth. This is good for the cable operator, so that they
can get more modems on a port, not necessarly to increase speeds to the
home. That is still a good thing for consumers, because theoretically
the operator won't have to segment nodes to maintain throughput,
keeping upgrade costs low.
However, since there are no DOCSIS 3 modems or related equipement yet,
this will cause a big hassle since everyone will need to upgrade
hardware (this is a complex change to a specification and a firmware
upgrade isn't possible). Comcast, for example, still uses DOCSIS 1.1
modems because they have a huge installed userbase that they would have
to deal with. In other words, don't hold your breath, and don't expect
a wholesale change.
Eric
| 
NewsGroups 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map