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pcscdma
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join:2004-01-14
Winterset, IA
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| reply to Nerdtalker
Re: Heh..
said by Nerdtalker  :
DOCSIS 2.0 is a viable solution, but its still too far off.
Comcast for one has only just begun upgrading to DOCSIS 1.1, and the majority of modems and linecards are still DOCSIS 1.x. My point still stands, they'd need to replace all of that, and what'd the only benefit be, so that the 5% of power users can P2P, host files/webpages, and use a webcam? From a business point of view, its simply not worth the time or money at this point.
There are ways to use multiple upstream and downstream channels on a cable segment. DOCSIS 2.0 allows a more efficient upstream modulation using only slighly more bandwidth to get the maximum 30mb upstream data rate it provides. This also allows them to better manage node saturation with multiple upstreams. Here is somewhat of an analogy(?) or at least something to explain. Imagine the T1 being one of a few lo-speed upload channels (only one can be used at a time) and the T3 being just one hi-speed upload channel. It also can be somewhat informative to certain people from the example I purposely have chosen. The ISP in the example has a topology that does not connect any T1s together and uses one of it's T1s for a certain group of customers.
A T1 can do 1.54Mbps and that's it. A small ISP can sell 6 256/256kbps connections and never fully saturate the connection. Since BBR people are cheap ba$tard$ and refuse to pay the $100+ price for a measly 256/256, the ISPs decide to oversell the connection and hope that the customers don't notice this. This means that the ISP cannot continue to sell 256/256 to new customers using the same T1. They would start to call in and complain about how stupid it was to have your oversell ratio all fsked up.
So instead of having a few T1s that have to be managed so each segment's bandwidth is sufficient, a T3 is used and usually can be oversold using a slightly higher ratio than a lower speed connection. If one T1 was quiet with nobody using it and another one was saturated, the bandwidth could not be taken away from the other T1 to make up for the saturated one. This can be very inefficient for bandwith and money, and the ISP could get upset subscribers.
Since when were 'power users' the only people who use webcams? The Moto SB5100 is DOCSIS 2.0
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Nerdtalker
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| said by pcscdma :
said by Nerdtalker :
DOCSIS 2.0 is a viable solution, but its still too far off.
Comcast for one has only just begun upgrading to DOCSIS 1.1, and the majority of modems and linecards are still DOCSIS 1.x. My point still stands, they'd need to replace all of that, and what'd the only benefit be, so that the 5% of power users can P2P, host files/webpages, and use a webcam? From a business point of view, its simply not worth the time or money at this point.
Since when were 'power users' the only people who use webcams? The Moto SB5100 is DOCSIS 2.0
Since most of the non power users are just beginning to understand how to even connect the webcam...
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.
Think about it from a business point of view, why would increasing upstream make your service more appealing to average Joe? He doesn't share files, run a webpage, or use a webcam, he only "surfs the net".
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| 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. | |
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