Quote:
Originally Posted by
coyoteaz 
...Cable providers around the country have at least 2 HD channels per RF channel, and in some cases, 3...
I'm sure you are correct and my information is now out of date. I knew that was coming, just didn't think it was here yet. That only widens the gap between DBS and cable in the realm of available bandwidth. But, it means little, since there is not a surfeit of services to put in those channels. It also does not help them on converting to fully digital, as subs will still need STBs or CableCards to get digital or even analog digitally-stacked channels, meaning they can't turn off analog cable, and probably won't until years after analog OTA goes dark. That bandwidth is in use exclusively for analog and will be for some time.
Quote:
Originally Posted by
coyoteaz 
...By signal fade, I mean signal attenuation over distance issues for people who are far from the distribution box or have extremely long internal runs in their houses...
Signal fade typically refers to a dynamic performance variable. Cable is designed to not vary dynamically in level (although a bit of that is unavoidable), and so it is unusual to hear it characterized using that term, but OK, I get your point now.
Cable is also designed to give subs approximately the same signal level either close to or far from a bridger or line extender amplifier. Due to the nature of frequency attenutation over copper the high channels are typically tilted forward (higher in frequency than the lower) close to the distribution amp, and reverse-tilted when farther away. IOW, If I live close to the amp and you live at the end of that distribution leg, channels in the mid-range should be approximately the same for both of us. Higher channels will read higher at my house, and lower channels will read lower, while the opposite would happen where you live, but essentially the same level of signals, generally speaking, should ideally be available to all customers. Only if there is an unusually long run after the tap should there be level issues in a properly balanced system, and there are ways to compensate even for that rare situation.
Quote:
Originally Posted by
coyoteaz 
...Nearly all (if not all) of Phoenix has been rebuilt since Cox bought the territory from Dimension, TCI, and the other former local providers...
True, but much of that was done over 10 years ago, when 650-750 MHz systems were the norm. There may be pockets that still do not give a full GHz of b-width, and they would certainly be targeted first, which is what I was referring to when I spoke of rebuilding plant that was still within its useful lifespan, just to increase bandwidth.
The primary rebuilding was not a copper for copper swapout, but a change from long copper cascades to fiber/copper hybrids, where fiber (which does not have the afforementioned tilt issues and has much less loss) is used to transport the signal to nodes where 2 or 3 cascaded conventional amps then deliver the signal by copper, in a sort of cellular pattern. Bandwidth on fiber is plenty wide, and that took care of the bulk of increasing bandwidth system-wide.
Also, there is likely fiber directly into our homes. The telephone drops installed for over 20 years now have included a glass fiber (unused) and the RG-6 drops used by some cable companies have dark fiber in them also, just waiting for the day when all cable is delivered by fiber and the STB's can handle it. If it ever becomes practical to deliver cable entirely by fiber, they will enjoy huge bandwidth as well as freedom from ingress inteference and egress issues, and will also enjoy severely-reduced maintenance costs. Their future is pretty bright.