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 tubbynetreminds me of the danse russePremium,MVM
join:2008-01-16
Chandler, AZ | precursor for things to come...? said by Karl Bode:But after their tangle with the FCC for forging packets and throttling P2P traffic, Comcast's all about transparency. According to Comcast, less than 1% of all users will ever brush against the current cap. Still, should the cable operator ever use lower caps or implement overages, they'd need to be sure that customers understand how much bandwidth they're using. i believe this is the key language here. once they have everyone using their service (and assuming the metered trials go well in texas and nevada), comcast should be able to effectively drop their cap, claiming most users never hit the number. the users can't claim ignorance, because they have the tools at their disposal to monitor and track what is going in and out of their lines.
i hate to play devil's advocate, but given the broadband industry's want for cutting corners and not upgrading their infrastructure, i can only see this as a precursor for things to come, especially given that the bandwidth will be even more crunched as docsis3 rollouts happen in all of the comcast markets. sure, from the cm to the node will have increased bandwidth, but in order to save money, comcast won't upgrade any of the fiber to the node because people won't create enough crunch on the node since they dont want to go over their now "lower than 250gb cap".
its a slippery slope.
but i'm still waiting for Rick  's spin on the whole thing 
q.
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| Yeah. I see this and more down the "pipes". (pun)
Comcast takes the first step and others will follow. First "here's how to see how much you use". Then follows with "You use THIS much, so time to pay up for all that!" And lastly, "Hey everyone, look and see who's doing what, how much, from where and when!" Caps, fees, premiums, tolls...oh my!
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patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | reply to tubbynet
said by tubbynet:i hate to play devil's advocate, but given the broadband industry's want for cutting corners and not upgrading their infrastructure, i can only see this as a precursor for things to come, especially given that the bandwidth will be even more crunched as docsis3 rollouts happen in all of the comcast markets. sure, from the cm to the node will have increased bandwidth, but in order to save money, comcast won't upgrade any of the fiber to the node because people won't create enough crunch on the node since they dont want to go over their now "lower than 250gb cap". No fiber to the node is upgraded for DOCSIS 3. The fiber is simply a very very very very low loss coaxial cable back to the head end. The fiber has the entire spectrum (channels 1-125+, and upstream/reverse channels) on it. A fiber node has nothing specific for DOCSIS in it. It just converts analog light pulses to analog electrical pulses. Its not a ADC to DAC but a analog to analog.
The only problem is, in some cases to save on fiber strands or put multiple nodes on 1 strand without DWDM/CWDM, the fiber doesn't have a channel 1-125+ spectrum on it, it can have 4 downstream 6mhz tv channels allocated to DOCSIS 1, each 6mhz channel is used by a different node, and the CMTS assigns modems to the corrent downstream DOCSIS channel when the cable modem signs onto the network.
Another scheme is 1 6mhz downstream DOCSIS channel shared by 4 nodes, then each fiber node has its own upstream spectrum image/bandwidth pool (7-47mhz) by modulating it onto the fiber, at different offsets (not at 7-47 mhz, but at "x*(7-47 mhz)"). This scheme allows more upstream traffic, yet doesn't require eating up more downstream bandwidth, or downstream multiplexors in the fiber node to replace/inject 6mhz channels from a higher frequency into the 47mhz-870mhz downstream frequency which is sent into the coax.
New bleeding edge technologies and very proprietary ones digitally sample the upstream traffic and then turn it into frames/packets, and basically send back the upstream information as the underlying digital data rather than an analog signal. The fiber node basically has a QAM/QPSK decoder in it, almost like a mini-CMTS, but still the fiber node only sees digital traffic, it doesn't know what DOCSIS is, and there is no difference between DAVIC, VOD, MPEG2, PowerKey, DigiCipher. | |
tubbynetreminds me of the danse russePremium,MVM
join:2008-01-16
Chandler, AZ | said by patcat88:No fiber to the node is upgraded for DOCSIS 3. The fiber is simply a very very very very low loss coaxial cable back to the head end. i understand that. the idea of my post was to say that comcast will upgrade from the node to the premise (last mile coax) to docsis3 spec, but will not spend the appropriate money to upgrade their backend fiber to the headend. obviously, if you run higher speeds from the premise to the node, then you will need a higher speed transport from the node back to the cable's isp. if comcast has some nodes that are maxed already with only docsis2 (or docsis1.1), then they will obviously need to upgrade to a bundle of gig links, or use some dwdm sfps at either end.
my argument that comcast will push higher speeds to the user, without upgrading everything else behind it. as such, they will be forced to lower the caps from 250gb and not take any flak because "users have a monitor in which they can view their monthly usage, as well as a three-month history of such"
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