DrTCP
Yours truly
Premium,ExMod 1999-04
join:1999-11-09
Round Rock, TX
| reply to Nerdtalker
Re: Heh..
said by Nerdtalker  :
You fail to understand why we aren't seeing DOCSIS 2.0 being phased in. Modems are available, but linecards and new CMTS equipment is costly.
First of all, most CMTS manufacturers now have DOCSIS 2.0 line card upgrades. ISP does not need to upgrade to DOCSIS 2.0 everywhere. Cisco is the dominant player in CMTS business and they started selling DOCSIS 2.0 CMTS last year.
Secondly, you only need to upgrade those systems where total upstream utilization at any one instant is likely to exceed 10Mbps (DOCSIS 1.0/1.1). But there are other solutions you can choose before DOCSIS 2.0 path. DOCSIS 1.0/1.1 systems can allocate multiple upstreams per one downstream channel (typically a CMTS card is 4up:1down). So, CMTS can loadbalance modems to one of the 4 upstream channels even though they all use the same downstream channel (beauty of DOCSIS scalable design).
If the modems are capped to T1 this is not going to cause any problems to the user.
The advantage of DOCSIS 2.0 is that it allows better upstream frequency usage (efficient use of spectrum) for the Cable ISP. It is not really a problem for the user. DOCSIS 2.0 and DOCSIS 1.1 use the same MAC code so the difference is basically on the physical layer. |
