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Reply With QuoteOn the first part of your post:
I think you have you technologies mixed up.
On the second part of your post:
No it is not true.
Technical Questions regarding Cable Network. I hope someone which technical knowledge with how Cable Network works can answer me this question i had for a long time.
How did DSL ( VDSL2 ) get more bandwidth to consumer then Cable when Coaxial Cable is like ten times thicker then a Single pair of Twisted Copper Line.
The Back end of all network are Fibre. Lets assume we are all FTTC / FTTB, and it is DSL / Coaxial that makes last mile.
I heard there were rules / regulation that require Cable Company to continue use Analog TV Signal instead of truly IPTV. Is that true?
On the first part of your post:
I think you have you technologies mixed up.
On the second part of your post:
No it is not true.
Thickness doesn't necessarily translate to more bandwidth.Originally Posted by Poet
The COAX network works on frequencies. Domestic DOCSIS uses a 6Mhz channel while EuroDOCSIS uses 8Mhz channels. Currently, Cable is using channel bonding (DOCSIS 3.0) to take several of these 6Mhz channels and creating a single "virtual" pipe between the CMTS and the Cable Modem.
Another thing that comes into play is pure marketing. If I can give you 50 donuts at 2$ per donut right now, is less profitable for me if I market the first 10 donuts at 1$, 10 donuts at 2$, 10 donuts at 3$ (as the time goes on of course)....etc
50 * 2 = 100
vs
10+20+30+40+50 = 150$ (50% increase for same product)
Cable has more bandwidth. The average coaxial cable can carry frequencies up to 3GHz. 1GHz or so is what the most advanced cable systems today carry.
However, the cable companies send linear TV, ondemand and voice along with that bandwidth. In most places they still carry analog because a lot of customers simply don't want to give up analog service on their older TV sets or use a cable box.
DOCSIS3 can go to 343Mbit/s down with 4 bonded channels. Future versions of DOCSIS may bond more channels.
VDSL2 maxes out at 100 or so Mbit/s. The TV offerings on VDSL services like U-Verse use IPTV which only sends one or two channels at a time to your house.
A lot of cable companies are constrained by old technology - to bump up the bandwidth, you have to upgrade amps, nodes and other equipment. Mostly amps which are limited in bandwidth.
The upstream uses low frequencies (5-42MHz) which causes the equipment to pick up more noise. This is again a legacy issue. They can get around it though but it takes $.
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