Message : Required fields Lab test – the first of its kind for this Broadcom device – demonstrates the potential for Full Duplex (FDX) DOCSIS technology to deliver the next generation of ultra-fast speeds Comcast today announced the achievement of another 10G technical milestone, conducting the first-ever live lab test of the Full Duplex DOCSIS system-on-chip (SOC) device that will pave the way for Comcast to deliver multigigabit upload and download speeds over its hybrid-fiber coaxial (HFC) network. Comcast announced the achievement of another 10G technical milestone. (Photo: Business Wire) Built by Broadcom, the device is expected to become the world’s first production silicon to be developed using the DOCSIS 4.0 Full Duplex standard, which represents an evolutionary leap forward in the ability to deliver ultra-fast speeds over HFC networks. One of the most important breakthroughs in the DOCSIS 4.0 standard is the ability to use network spectrum more efficiently, allowing operators to dramatically increase upstream speeds without sacrificing downstream spectrum to do so.