 IgnitePremium,VIP
join:2004-03-18
UK | reply to fifty nine
Re: ??? said by fifty nine:4 channel DOCSIS3 already can. The cable companies probably won't deploy it yet because there's no real need for it for home users right now. In fact most home users would get by just fine with less than 512k. Every customer gets their own node, 4 ports of a CMTS card, and 25.6MHz of upstream spectrum @ 64QAM?
Note that I said 'per customer' not 'per MAC domain'. What the technology can do across what's probably 1000+ modems sharing the bandwidth is irrelevant as, unlike DSL, it's not a dedicated link between CPE and provider.
DOCSIS 3 upstreams won't exceed those levels until analogue is gone from cable networks and plant has loads of work done on it due to NTSC restricting subsplit sizes, upstream spectrum is 5 - 40MHz at best in North America, and not all of that usable due to noise.
Theory wise, sure, practically, not going to happen.
Also worth bearing in mind that the oft quoted '160Mbit downstream 120Mbit upstream' capabilities of 4 channel in both direction are not actually the case either. Real maximum downstream throughput with wind in sails and down hill will be around 152Mbit and upstream around 106Mbit. |
