Light Reading
Comcast is mixing fiber and its Metro Ethernet platform – not Docsis 3.0 – to power its new residential 305Mbit/s broadband tier

Comcast Gives FTTH a Shot

Jeff Baumgartner
LR Cable News Analysis
Jeff Baumgartner
9/27/2012
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Comcast Corp. (Nasdaq: CMCSA, CMCSK) is using the fiber-to-the-home (FTTH) capabilities of its Metro Ethernet platform to power a new residential broadband service with a maximum downstream speed of 305 Mbit/s and a potential 65 Mbit/s upstream.

The cable operator is using Docsis 3.0 technology for its widely deployed 105Mbit/s (downstream) high-speed Internet residential service, and has even demonstrated how that service could ultimately achieve speeds of more than 1 Gbit/s on live cable plant. (See Comcast Plugs In Cisco for 1-Gig Docsis Demo .)

Despite that potential, Comcast is keeping Docsis 3.0 on the sidelines for its newest, fastest residential broadband tier, called Extreme 305, which is being offered in several major markets in the Northeastern U.S., including Boston, Philadelphia, Baltimore and Washington, D.C.

In terms of speeds, it matches Quantum FiOS, a new GPON service from Verizon Communications Inc. (NYSE: VZ) that offers 300 Mbit/s downstream and 65 Mbit/s up. (See FiOS Speeds & Prices Take a Quantum Leap .)

Comcast didn't provide much technical detail about the systems that will enable Extreme 305 when it announced the new service in July, and didn't add much detail last week when the service was launched, causing some observers to falsely assume it was a Docsis 3.0 offering. But the company has confirmed that Extreme 305, at least initially, is fiber-based. (See Comcast Revs Up Pricey 305-Meg Tier, Comcast's Fastest Broadband Starts Cap-Free and Comcast's Technicolor Dream Gateway.)

This post at Broadband Reports outlines some of the service's technical criteria, noting that eligible customers must be within reach of Comcast's Metro Ethernet platform, which the MSO is already using to go up-market to serve mid-sized business customers. Extreme 305 also appears to be limited to single-dwelling units that are located less than one-third of a mile from a fiber access node. In the home, the service relies on the Netgear Inc. (Nasdaq: NTGR) R6300, an 802.11ac Wi-Fi router. (See Ciena, Cisco & Juniper Get Piece of Comcast's MetroE.)

Essentially, Comcast is fighting fiber with fiber. It's utilizing a business-class platform to deliver a high-end residential service as it tries to discover what sort of demand there is for an uncapped 300Mbit/s product that currently sells for US$300 per month. And, according to this statement from Comcast spokesman Charlie Douglas, it appears that Comcast will use the fiber-based approach as a placeholder for very high-capacity residential broadband services until it makes business sense for the MSO to make significant changes to its Docsis platform:

"We've demonstrated our Docsis 3.0 infrastructure, which we currently deliver to more than 50 million homes, is capable of delivering 1 Gbps or more. While demand for faster speeds continues to grow, demand for ultrafast speed tiers (of more than 200 Mbps) is still emerging. In the near-term, until there is clear demand to modify the capacity of our existing Docsis infrastructure, we can provide our new residential Extreme 305 service by leveraging the fiber already in our network and our Metro-E product."


The status of Docsis 3.0
The latest generation of high-volume Docsis 3.0 modems and gateways can bond eight downstream channels, enough for bursts in the area of 300 Mbit/s, though sustained speeds would be much lower than that. Hitron Technologies Inc. , Arris Group Inc. (Nasdaq: ARRS) and other Docsis 3.0 CPE vendors are also developing models based on new silicon from Intel Corp. (Nasdaq: INTC) that can bond 16 or 24 downstream channels and up to eight upstream channels. The 24-channel version can achieve downstream rates near 1 Gbit/s when fully loaded. (See Intel's New Docsis 3.0 Chip Guns for 1-Gig .)

But those products are still in their infancy. Hitron, for example, plans to submit a wireless gateway based on the 24-channel configuration to CableLabs for certification testing this November. Results from that test wave aren't expected until late February 2013. Some of the major cable modem termination system (CMTS) vendors, meanwhile, are working on new software that can accommodate these beefier channel-bonding capabilities. Depending on the vendor, that software may not be ready until mid-2013. (See 1-Gig Cable Gateway Gets Ready for Its Close-Up .)

— Jeff Baumgartner, Site Editor, Light Reading Cable

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marjsdad
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marjsdad,
User Rank: Light Beer
12/5/2012 | 5:20:19 PM
re: Comcast Gives FTTH a Shot


Interestingly, using different (actually complementary) technology, Comcast is offering a tier that would be exactly in line with an 8 down, 4 up DOCSIS 3.0 configuration, which I think is quickly becoming the standard until chips and gear for 16 or 24 bonded channels comes on line. So, regardless of the technology, Comcast could offer the same top tier to every market.

AESerm
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AESerm,
User Rank: Light Beer
12/5/2012 | 5:20:19 PM
re: Comcast Gives FTTH a Shot


So apart from the Netgear 6300 in the home, the network interface to the residence is what, just a media converter? Any talk of EPON here?

Jeff Baumgartner
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Jeff Baumgartner,
User Rank: Light Beer
12/5/2012 | 5:20:18 PM
re: Comcast Gives FTTH a Shot


Off-hand, I don't know much about the network interface in this instance and how it's similar or different than what Comcast's using to bring MetroE to biz customers (anyone from Comcast care to confirm?). They didn't mention EPON specifically in the context of this new residential MetroE tier, but that's the approach a lot of the cable guys have been taking with their carrier Ethernet/fiber deployments, no? JB


 

Jeff Baumgartner
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Jeff Baumgartner,
User Rank: Light Beer
12/5/2012 | 5:20:18 PM
re: Comcast Gives FTTH a Shot


It certainly does, but i wonder if the headroom in 8x4 is big enough to support a product that could be advertised as 300Mbit/s down... maybe it's too tight, meaning that they'd have to look at 16x4 or 24x8.  But this near-term approach seems to make some business sense... use existing fiber and the MetroE platform for one-off deployments as you figure out the demand, then spend more building up more Docsis capacity once there's a broader need to support those bigger broadband tiers... or perhaps when they're ready to employ a full IP video simulcast.  Makes no sense to add all that capacity across the board in a system if it only benefits a sliver of the customer base.  JB


 

AESerm
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AESerm,
User Rank: Light Beer
12/5/2012 | 5:20:13 PM
re: Comcast Gives FTTH a Shot


And no 'fiberhoods,' I gather. 

Jeff Baumgartner
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Jeff Baumgartner,
User Rank: Light Beer
12/5/2012 | 5:20:13 PM
re: Comcast Gives FTTH a Shot


As a quick update, there's no EPON involved in this; it's all point-to-point. JB

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