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UPC 120Mbps BB coming...

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    #122
    LKAlias1989
    Closed Accounts Posts: 6 ✭LKAlias1989


    cisk wrote: »
    The 20Mb Config file specifies 20Mb Downstream so i dont know how you could go faster than 20Mb.

    Well my brother has a 10Mb connection and he got up to 15mbps in a test.
    He said they have upgraded the speeds slightly, so they must be on the ball getting ready for the 120Mb speeds. I don't mind having over 30Mb as long as the price stays at €42.


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    #123
    watty
    Registered Users Posts: 32,417 ✭✭✭✭watty


    The higher speeds use a DOCSIS 3.0 modem which actually implements multiple modems on different channels at the same time.


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    #124
    -ADREN-
    Closed Accounts Posts: 1,368 ✭✭✭-ADREN-


    How many people share a node??

    If 10 people share a node and were all downloading at the same time from a node of 120mb down, would they all only be able to reach 12mb?


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    #125
    watty
    Registered Users Posts: 32,417 ✭✭✭✭watty


    The number of people on a Head End is variable. It can be over 1000 on traditional cable. It can be as low only 20 on HFC aka FTTC+cable

    Each 8MHz channel on Coax can be Analogue TV(1ch), 10 Digital Ch (MPEG2), 20 Digital Ch (MPEG4) or about 4 to 5 HD Channels. Or shared to Modems. A Channel is about 45Mbps. Or maybe 60Mbps on DVB-c2

    A cable segment (node/headend/cabinet) could easily have 800MHz of Downstream bandwidth, = 100 Channels of 8MHz, or a maximum of 2,000 TV channels! There can be any mix of MPEG2, MPEG4, HD, Analogue and Modem Channels.

    If 40:1 contention was used you would expect maybe 1/2 to 1/3rd of peak package speed at 8pm.

    If 10:1 contention was used, you could easily have 120Mbps download with no noticable slowdown if there is a Cap.

    To have NO cap, you need very low or nearly no contention. If you have 20 users each channel is 45Mbps, then 3 channels per user = 60channels would be 1:1, i.e. No contention. YOu would only need 10 channels for regular TV ( 200 channels in MPEG4) and 5 for HD (25 channels) the remaining 25 channels could be upto 125 channels of HD or 400 channels of SD MPEG4, using Switched video, this means 125 setboxes could have choice of 1000s channels of VOD/Live video, assuming thus less than 100 customers per node (or < 62 with two room VOD). Switched video gives flexibility of VOD/IPTV but with speed and quality of DVB, as it uses DVB for delivery.

    Cable and especially HFC aka FTTC + Cable blows DSL and regular IPTV out of the water.

    Basically coax using existing DVB-c has a total download bitrate of 4,500Mbps and using DVB-c2 maybe 6,000Mbps (TV + data) . It's how many headends/Cabinets that decides how many people that is shared to. The cabinet/headend to user cost is much lower than fibre. The user can easily split the signal and add more points and move setbox. The operator can decide mix of services.

    The upload isn't so great, up to a total 1620Mbps (data only) depending on how good the cable is. Still cheaper than comparable speed cheapest fibre solutions.


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