100G Goes Live on Comcast

Arthur Cole

Wide area networking got a shot in the arm of sorts last week with the test of a new 100G optical system from Nortel over Comcast's Philadelphia plant during the Internet Engineering Task Force meeting.


The Nortel 100G adaptive optical engine delivered a 100G wavelength simultaneously with live 10G and 40G traffic that already supports HD video, internet and voice traffic. The feed traversed a Comcast network connecting Philly to McLean, Va., incorporating both metro and long-haul fiber.


To get the system to work, the Nortel system had to integrate with Comcast's existing infrastructure, which included a Common Photonic Layer DWDM system with a 50 GHz enhanced Reconfigurable Optical Add/Drop Multiplexer (eROADM). The 100G interfaces were installed on Nortel's Optical Multiservice Edge 6500, using the same integrated dispersion compensation and dual-polarization Quadrature Phase Shift Keying (QPSK) modulation found on current 40G systems.

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