Comcast XFINITY TV → Re: Firewire Port on 6412/3412 hdmi Comcast SF

Here is an excerpt from the FCC regulation. It is preetty clear that it states both dvi or hdmi and IEEE1394 (firewire) interface.

4) Cable operators shall:

(i) Effective April 1, 2004, upon request of a customer, replace any leased high definition set-top box, which does not include a functional IEEE 1394 interface, with one that includes a functional IEEE 1394 interface or upgrade the customer's set-top box by download or other means to ensure that the IEEE 1394 interface is functional.

(ii) Effective July 1, 2005, include both a DVI or HDMI interface and an IEEE 1394 interface on all high definition set-top boxes acquired by a cable operator for distribution to customers.