Here's his convincing, IMO argument as to why S-CDMA is better(cheaper) in upgraded plant.
"All along the coax path the splits and amplifiers in the lines introduce noise into the system. In the upstream direction-from home to headend-the same noise is compounded and funnelled as the branches rejoin the trunks. Furthermore in the spectrum used for upstream transmission-mostly the "lower forty" megahertz in the pipe-the coax cable itself acts as a large antenna receiving interference from nearly everything that spikes and vibrates in the area, from garage door openers to hairdryers, from CD radios to AM radio and TV harmonics.
The expensive answer to these noise problems is to upgrade the system, laboriously adding fiber and coax, moving nodes closer to homes, severing branches from each trunk, removing old cables, splits, and amplifiers, all in all reducing the number of homes sharing each node."
Reducing the number of homes sharing each node. Mark Laubach has told us correctly I think, that this is a significant cost issue. No? Or was it Dave Horne? So even when you are upgraded, more homes equals more noise. Terayon can handle it beyond where TDMA quits, as I understand it. Hence too, noise from other sources would leave Terayon running alone where CDMA quit.
I gather S-CDMA can use the 5-20mhz spectrum, and that cmto and the others don't function significantly below 20mhz. That's a point on the plus side, no? Or has this been covered...I know something was written here addressing this.
Dan B |
