“We’re still limited in the upstream channel,” said Rouzbeh Yassini, CEO of YAS Broadband Ventures. “Good job, but no cigar yet. Even 35 Mbps upstream is still not enough.”

Yassini said 100 Mbps shared downstream speeds achieved with DOCSIS 3.0 are peaks, not constants, and today’s applications need constant bit rates.

“If you want to have multiple services and high definition (HD) video, it’s not the ultimate answer as far as our network capacity goes,” Yassini said. “Constant HD needs a constant bit rate.”

Sometimes called the “godfather” of DOCSIS for his role in shepherding the original specification, Yassini stirred things up a bit with his comments.

“I thought Rouzbeh (Yassini) was a bit harsh in terms of the upstream,” said Michael Cookish, a senior director of CMTS product management at Motorola. Cookish agreed that 100 Mbps upstream speeds would be demanded in the commercial services arena within three to five years, but that it would be doable.

To reach the necessary upstream speeds, Cookish recommended: (1) migrate to DOCSIS 2.0; (2) add upstream channels; and (3) split nodes.

As for why consumers will need such high speeds, next generation broadband applications were mentioned, including security systems, building temperature controls and digital signage.

source: cable360.net