Motorola SB6120 First DOC 3.0 Modem In Retail > I saw these at Compuplus last week

reply to Bit

Re: I saw these at Compuplus last week

No genius, I know the capacity of DOCSIS 3 and know that CV will never allocate enough channel space to support a lot of 100Mb bonded users.

I don't have to be on the moon to know it isn't made of cheese.
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POKE 65495,1

Yeah and the same limitations that force cable operators to use powerboost gimmicks to deliver 30Mb service because DOCSIS 1 and 2 topology won't support lot of simultaneous 30Mb subscribers is the same reason DOCSIS 3 can't support lots of 100Mb users.

And even with providers like CV who advertise continuous DOCSIS 1.1+ 30Mb service, can't deliver it to all their BOOST users all the time, their actual throughput depends on other local user traffic. BOOST is simply uncapped service and 30-33Mb is all one can reasonably expect from a DOCSIS channel. All DOCSIS 3 does is permit channel bonding, it does nothing to alleviate the actual per channel capacity bottleneck currently granted under DOCSIS 2 nor does it increase nodal capacity. This isn't a "this Cali guy doesn't like CV" thing...this is a simple DOCSIS math thing.

If Cablevision was dedicating enough 6MHz channels to HSI everyone would be seeing their tiered caps all the time and they don't.

You should read a bit about how DOCSIS works before touting cablevision 100Mb greatness. Whether next door or 3000 miles away, the challenges facing cablevision and other DOCSIS 3 operators is the same. The pre-cert DOCSIS 3 spec doesn't change with geography genius and there are only so many channels they can dedicate to HSI.

They can not support a lot of users on this tier, period. That is why they're charging a cost prohibitive activation fee, so that few if any sign up while allowing them to put up the "fastest broadband in America for $99" posters.
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POKE 65495,1

Sorry, read it again, I didn't say Cablevision used powerboost, I was speaking directly to DOCSIS channel capacity limitations which like all cable operators do, Cablevision certainly has.

Again, you need to understand how cable topology works. Cable's bottlenecks are rarely if ever backbone connectivity. Is it nearly always nodal capacity issues where you have a lot of users sharing channel capacity in the last mile.

DOCSIS 3 does not increase channel capacity nor does it increase the overall number of 6MHz channels (out of the 750MHz or if upgraded like Cox is trying to do, 1GHz) CV dedicates to HSI. It merely allows cable to bond existing channels together so that they can deliver more than 38Mb to an individual user who before DOCSIS 3 could only use 1 channel (which is why Boost is 30Mb, cause that is about the max you typically see from an unused channel).

It is still the same shared topology where you have a limited number of 6MHz channels being shared by hundreds of users. And to be clear, the "node" isn't the bottleneck, it is how many channels the cable operator dedicates to HSI and with 100Mb service taking nearly 3 channels of bandwidth for a single user, it is obvious to ANYONE that a cable provider can't support a more than just a couple of local 100Mb users on a node. There just isn't that much available bandwidth. Cable HSI capacity can be improved by SDV, ditching analog, moving from 750Mhz to 1GHz, with the freed capacity going to additional HSI channels. But that can only go so far, especially with these operators adding HD networks and HD PPV offerings hand over fist. A 6MHz channel can carry an analog video channel, 6-10 digital SD channels, or 2-3 HD channels. That is valuable real estate. Cable offers a lot of video and streaming (on demand) content in this limited spectrum, not allowing them to just give HSI all they want. To even begin supporting 100Mb they would need to completely ditch analog video and put that capacity to HSI.

And 100Mb isn't difficult for just cable. GPON offers Verizon 3X DOCSIS 3 bonded capacity and is shared by only a small fraction of users (homes 32-64 homes, even fewer subscribers), and they couldn't support 100Mb service to a more than a couple of local users at a time.

Cablevision MUST have a way of insuring that only a very tiny fraction of users go for this 100Mb deal and their solution is the bullcrap activation fee. It accomplishes 2 things, first to dissuade people from signing up. Second it allows their marketing department to splash $99 all over the place.

You, I suppose think they could support lots of users buying this tier but we will never know because they instituted a pricing policy that insures that very few will bite.
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POKE 65495,1