ARRIS Unveils 4.5Gbps Cable Technology



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Hi :)

first about cable and fiber speeds, by using a measured length of cable ether fiber or copper they can time how long the signal takes to travel through it, and nether fiber optic or electric copper cables go at the speed of light, it is a matter of how electricity or light passes through a solid object that slows them down, the only way you can get true speeds approaching light speed is by some kind of super conductor, anything else the electrons or photons have to interact with the atoms of the conducting material and that takes time, measurable time that is a known and well established fact.

Second copper cables are limited because electricity interferes with electricity, you can pump a lot through a copper line but eventually the interference turns the signal into junk

light on the other hand does not interfere with itself, you can double the bandwidth of a fiber cable just by using two slightly different light frequencies, in a recent test several thousand different frequencies were pumped though one fiber, this means if your fiber can do one gig speed and you want to make it do 100 gigs speed all you need to do is replace the laser modems at each end with a new design that handles 100 times the color frequencies and that’s it, like the cable companies get faster speed with new modems the fiber companies can do the same but have vastly more available theoretical bandwidth to work with.






There isn't a thing wrong with copper, right now...

But short of re-inventing the transmission methodology completely for copper, Fiber can and WILL surpass its copper rival's physical limitations in the very near future. Fiber is nowhere even close to reaching its stride yet, while copper is being pushed to its upper limits already.


An analogy of comparison would be, copper has gone through its hand-delivery mail phase and gotten up to a theoretical pony-express capability... Meanwhile Fiber optic technologies are already at a telegraph level and are multiplying in capability all the time because the conduit isn't the limitation, it's the transmitters and receivers that are doing everything they possibly can to try to make use of the incredibly broad pipe they now have.



Great, I'll be able to reach my data cap really fast!



I'd be more excited if they revealed a plan on how they were going to push even a tenth of that speed into more markets to provide more competition.


All the lab speed records mean crap when most of the country is stuck on 1.5Mbps DSL, and two providers to pick from, if they're lucky.



Most cable systems are ~760mhz with some in larger cities being about 1ghz.  Each channel is 6mhz.

128 channels just for downstream basically maxes out the entire cable system in most areas. And that's before you throw in the upstream channels and account for the fact that you also have to have room for TV channels (6mhz = 1 analog, 2/3 HD or ~10SD).  So, say, if you have 20 HD stations, 100 SD stations and 50 analog stations (remember also that analogs are duplicated in SD), which is a typical cable setup and you barely have enough room on the system for DOCSIS 3 with it's measley 4-8 channels (and that's 4-8 channels per modem; typically, multiple groups of these channels have to allocated for data so that every cable modem isn't sharing the same channels or you'll have massive contention.)



The faster speed is great, But if the server you are asking data from can't send it that fast, then so what?

Just a thought...



So they 'can' do this, but what are they 'going' to do? Answer, keep providing sub-par service while charging maximum rates.

Broadband providers make me pecimistic.




What is the theoritical maximum throughput for FiberOptic though? I always thought that a packet of light is faster than an electrical packet.



Just to clarify, an "electrical packet" travels at the speed of light through a copper wire. That is not the determining factor here.


Brad Chacos

Hey Caboose,

While it's far from the theoretical maximum, the fastest Verizon FiOS connection you can purchase tops out at 150Mbit/s down and 35Mbit/s up for $199/month. Just tossing that out there for comparison purposes.



Just what I was thinking.



I think it's 128 terabits per second



Well we don't know is the real answer. Since fiber is just light moving through a cable we can use far more bandwidth than a copper cable we just need a transmitter and a reciever that can analyze the light spectrum. So theoretically we can use the entire gamut of light waves to send data but the equipment to analyze it needs to become more precise and then we can achieve higher speeds. But the maximum is higher than cable, by the time we reach that point though we will probably need to reinvent the TCP/UIP stack in order to hadnle all of the information without requiring too much additional processing.

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