Comcast Digital Voice infrastructure?

[Scott Ehrlich]

My parents currently have RCN for voice, cable, and Internet, and are now 
re-evaluating who has what and associated costs.  They were at a Comcast 
service center and called me from their cell phone to have the Comcast 
customer service person explain to me how their digital service works.  I 
pushed, verifying their offering was not VOIP, and they confirmed.  I then 
asked how the infrastructure was designed once the signal left the 
customer.  The best I got was it goes over coax, Internet services is not 
needed, the service uses Comcast' own private network, and the customer is 
given an 8 hour battery in case power goes out.

What more can the list offer for how Comcast' service works?  How about 
RCN's?   What do people see if price differences?  How about in comparison 
to FIOS?

For Comcast Digital Voice, can I go out and get a larger-capacity UPS and 
slap it on Comcast' connection and extend the life beyond 8 hours?

Thanks.

Scott

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