said by FifthE1ement:We do have MoCA in use in my area for Comcast's AnyRoom DVR service so I guess we have 1Ghz+?
The MOCA signal is only inside your home, it is only used to transmit between the Anyroom DVR and the other boxes in the house.
Comcast installs a Low-pass filter on the coax where it enters your house, that cuts off anything over 1GHz getting in or out.
MOCA is not used to transfer any signals throughout the rest of Comcast's outdoor cable plant.
Isn't it just amazing how much they can put through one copper coaxial cable?! I wonder if there are frequencies we don't know about yet and perhaps one day we'll be able to utilize them.
Coaxial cable gets really bad beyond the 2-3GHz(microwave frequencies) point, it's way too lossy, and is only good for very short distances.
It can still work at higher frequencies, but is best left to short jumpers of 10 feet or less, often only several feet or less.
An example might be a cell tower, with frequencies in the 1.8GHz to 2.6GHz range, and a short 120ft run of hardline type coax can be 1.25 inches to over 2 inches in diameter, just to keep the signal loss down to an acceptable level.
Beyond that, a Waveguide replaces coax for long signal runs.
It's like a hollow metal tube, it's circular or rectangular in shape, and the radio waves just bounce along inside it, to their destination.
Microwaves behave much more like Light than lower frequency RF signals do, which is why a waveguide is the foundation behind fiber optic cable(fiber was originally called a LightGuide), where light bounces along inside the fiber to it's destination.
I could see pushing a typical cable TV plant up to 1.3GHz, or even to 1.5GHz, but the fiber nodes will need to be completely rebuilt to handle it, and will need to be moved much closer to your home, almost like Fiber-To-The-Curb.
At that point you move the downstream channels to the 1GHz-1.3GHz range, and expand the upstream channels to 5-133MHz.
Leaving a bit of guard band in there above the upstream path, that would support a 50x20 DOCSIS 3.0 modem by todays standards, but with that extra bandwidth, future versions of DOCSIS would likely opt for larger than 6MHz channels, so fewer "bonded channels" but they would also be much larger physical channels.
Like bonding 10 channels but the channels would be 30MHz each, instead of 6MHz.
1+Gbps speeds would almost be the "Starter" Internet tier at that point.
