Contributed By John Chapman, Chief Technology Officer, Cisco Cable Access Business Unit, and Engineering Fellow
Earlier this year, as part of CableLabs’ “Innovation Showcase,” in Atlanta, we showed how DOCSIS 3.0-based technologies can gracefully and powerfully scale, if operators were to continue increasing the number of digital channels they place into a DOCSIS bond.
The question we were endeavoring to answer was this: Is DOCSIS dead, or does it have another 15+ years of life in it? The answer is clearly the latter. Why? Because the classification and QoS features in backbone routers (like our recently announced ASR 9000 System) are architected for massive speed, in terms of packets-per-second - and those features will migrate down into cable CMTS gear.
The demo for CableLabs focused on our 3G60 CMTS cards, which bonded 48 downstream channels and 12 upstream channels, using 256 QAM in the downstream, and 64-QAM in the upstream. The result was a 1.6 Gbps downstream pipe, and 300 Mbps upstream. But that was back in February. The bond size was generous, but still partial. When you consider the full spectrum capacity of cable television systems - from 54 MHz to 1 GHz, downstream, and from 5 MHz to 42 MHz upstream - clearly, there’s a lot more breathing room for wideband IP services.