A trio of cable-modem vendors will be providing the Internet-protocol voice
link for Comcast Corp. customers in Philadelphia.
After filling in the details for the headend and voice-gateway gear earlier
this summer, the MSO provided the last piece of the puzzle with the
It tabbed Arris, Terayon Communication Systems Inc. and Motorola Inc. to
supply the IP voice-enabled modems for the rollout, set for the second quarter
All of the modems provide two lines of voice and Ethernet and
universal-serial-bus ports to connect other computer devices.
The Arris 'Touchstone' telephony modem is Data Over Cable Service Interface
Specification 1.1-certified, while the Motorola 'SURFboard SBV4200' and the
Terayon 'TA 102' embedded multimedia-terminal-adapter unit are DOCSIS
Arris is also providing its 'Cadent C4' cable-modem-termination-system units
for the Philadelphia rollout, while Motorola has provided modems for Comcast's
IP-telephony trial in Detroit.
Terayon, meanwhile, adds an element of advanced-physical-layer technology to
the mix -- its modem is also based on DOCSIS 2.0, a new specification that can
expand upstream capacity and clear up signal-interference
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