Chris Topazi Archives |

“Hey, OFDMA, Why Are You So Sensitive?”

By Chris Topazi – We have discussed OFDMA, its benefits and some of the lessons learned in our deployments. In this article, we seek to address a question that we are asked quite frequently from our leadership and from our field personnel—why does OFDMA appear to be more sensitive to noise than our traditional ATDMA upstream

Mid-split with OFDMA: Keys to a Successful Deployment

By Chris Topazi – Here at Cox, we have converted thousands of DAA based RPD nodes to mid-split upstream with OFDMA. Previously, we had discussed the impact of over-the-air television broadcasters in this band, and what we planned to do about those issues.

OFDMA and Ingress

By Chris Topazi – The alternative of allowing the customer to try and blast through this ingress will result in uncorrectable FEC codewords, and hence packet loss, when trying to use those minislots that are impaired.

Crawl, Walk, Run to Network Transformation – DOCSIS 3.1

By David Ririe and Chris Topazi – Having recently completed our initial deployments of DOCSIS 3.1 OFDM on our CCAP platform here at Cox, our team took a few moments to take a deep breath and reflect on what has occurred over the past two years. We thought that sharing our reflections on the successes we have had, the challenges we have faced and overcome, and our view of what the future may hold, would be of interest to those planning to journey down a similar path.