The markets where Comcast will deliver the fiber-based service include parts of Boston, Hartford, Philadelphia, Pittsburgh, Harrisburg, Wilmington, Baltimore, Washington, D.C., Richmond, and New Jersey.

According to anonymous sources in Broadband Reports' user forum, Comcast will be delivering a service that looks and smells like the Metro Ethernet service it delivers to its business clients. To deliver the service, the MSO will use Ciena's (Nasdaq: CIEN) 3931 Service Delivery Switch in the last mile network and a NETGEAR (Nasdaq: NTGR) R6300 gateway inside the home.

However, there appear to be some key limitations to the service. For one, a customer has to be located near one of its Metro Ethernet platforms, which it using to target medium and large business customers. Second, a customer has to live in a single-dwelling unit that is located 1/3 mile from a fiber node.

Charlie Douglas, a Comcast spokesman, said in a Light Reading article that it is using its existing fiber network to deliver a service to gauge interest in these higher speed platforms and determine what changes it may need to make on its existing DOCSIS infrastructure.

"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," Douglas said. "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."

Comcast, however, isn't the only MSO that wants to take a bite out of Verizon's higher-speed FiOS lunch. Charter Communications (Nasdaq: CHTR), while not revealing any specific plans, said in late August that it is also developing a 300 Mbps speed tier.