Comcast staked a claim as the first in the world to deliver an end-to-end full duplex (FDX) DOCSIS 4.0 connection from its network to a customer gateway, building on earlier trials of individual network components.
Earlier this year, the operator hit 4 Gbps in a test of a full duplex system-on-chip from Broadcom. Prior to that, it achieved symmetrical speeds of 1.26 Gbps in a DOCSIS 4.0 test conducted in October 2020.
Elad Nafshi, SVP of next generation access networks at Comcast Cable, told Fierce its trial in April marked the first time it had DOCSIS 4.0 silicon for the node section of the network and was able to pass traffic through that equipment. But “what we’re talking about today is starting to fill in the rest of the building blocks of the ecosystem.”
Specifically, it connected a virtual cable modem termination system (vCMTS) which now speaks DOCSIS 4.0 to a node and passed traffic on to a specialized DOCSIS 3.1 modem which was configured to operate in the FDX band. Comcast did not disclose the speeds it achieved in the latest trial.
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