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First question...

Discussion in 'DIRECTV - Coax Networking (private)' started by 66stang351, May 30, 2009.

  1. Jun 3, 2009 #221 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    CSMA/CD? You got the blonde version? :lol:

    Dongle/switch seem to be the same thing, but packaged differently.
    Splitter isolation is still something not yet understood.
     
  2. Jun 3, 2009 #222 of 286
    RunnerFL

    RunnerFL Well-Known Member

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    Same here
     
  3. Jun 3, 2009 #223 of 286
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    CSMA/CD= Carrier Sense, Multiple Access with Collision Detection=Ethernet. :)

    The network adapter listens for someone already talking (Carrier Sense)
    If no one is talking, it assumes it can talk (Multiple Access)
    When it is done talking, it listens to see if there was someone else talking at the same time(Collision Detect).

    But this does not solve your isolation loss problem. Someone might have to dig into MoCA to see how they've solved that. :)

    Cheers,
    Tom
     
  4. Jun 3, 2009 #224 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    With the Cable version... LOTS OF POWER
     
  5. Jun 3, 2009 #225 of 286
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    Do you have a sense of the power level? Would 450ma of 18V do it? :D
     
  6. Jun 3, 2009 #226 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Not DC voltage/ma, but dBmV of very high levels. I've been googling, but to no avail. Broadcom has a MoCA chip that can output 0 to +5 dBm, or 49-54 dBmV in a SAT feed of -15 dBmV.
    [disclaimer: most is from my memory and should have salt added]
     
  7. Jun 3, 2009 #227 of 286
    Tom Robertson

    Tom Robertson Lifetime Achiever DBSTalk Club

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    The BCM3450 MoCA Transceiver/power amplifier runs on 1.2W, well below the 8W you can get from a satellite input.

    Cheers,
    Tom
     
  8. Jun 3, 2009 #228 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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  9. Jun 3, 2009 #229 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I can't help but think of this like looking at the Empire State building [top to bottom] and trying to see what color clothes the people are wearing on the sidewalk next to it. MoCA it the TV tower on the top and the SAT signals are the people.
     
  10. Jun 3, 2009 #230 of 286
    DJPellegrino

    DJPellegrino Godfather

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  11. Jun 3, 2009 #231 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I always seem to find something to question:
     
  12. Jun 3, 2009 #232 of 286
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Thank you for sharing...I found this section most interesting...

    MoCA technology was designed from the ground up, to address the key requirements for networking digital video within the home:

    * High throughput - 270Mb/s PHY (PHysical laYer) data rate.
    * Low packet error rate - better than 1e-5.
    * High outlet coverage: 97% of all outlets achieve greater than 100Mb/s with no modifications to the existing home coax network.
    * Quality-of-service (QoS).
    * Security and Privacy.
    * Ease of use.
     
  13. Jun 3, 2009 #233 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    While I think this is true, it also comes from the marketing group. :nono: :lol::lol:
     
  14. Jun 3, 2009 #234 of 286
    hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Say no more....just when I was starting to get excited...:(:lol:
     
  15. Jun 3, 2009 #235 of 286
    DJPellegrino

    DJPellegrino Godfather

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    As of a Feb 2009 report, 20 million nodes have been shipped.
     
  16. Jun 3, 2009 #236 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    And how many are sitting in warehouses?
    I mean think about this: 5,000,000 nodes @ $99 each? Look if there were five/home, that's still 1,000,000 homes.
    I know there installed but do you really think the market penetration is that great, this soon?
     
  17. Jun 4, 2009 #237 of 286
    DJPellegrino

    DJPellegrino Godfather

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    I really don't know...just thought it would be of interest to everyone. :confused:
    MoCA is relatively new, being that it's inception was about 2004 I believe.
    No doubt they are including FIOS in those numbers. I think I read that. Does ATT U-verse use a MoCA implementation? If so, I'll bet those numbers were included as well.

    I also read an article about 1394 firewire over coax, which claims that it's thruput is upwards of 800Mbps something like 8x MoCA. I don't know where that stands in becoming a standard, but in any event there is lots happening with coax! and it only benefits us all as long as we have the money for the technology.
     
  18. Jun 4, 2009 #238 of 286
    veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    This is all good info, I just discount [hate] the marketing hype. I know it's their job/mission to promote, but I've grown accustom to disbelieving them too.
    Don't all the truck makers say their truck is the number one selling truck? :lol:
     
  19. Jun 4, 2009 #239 of 286
    Davenlr

    Davenlr Geek til I die

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    Yea, and AT&T has more bars in more places...if you happen to be wanting to make a call in YEMEN...dont try it in the Ozark Mountains of Arkansas tho....three hours driving with NO SERVICE on the phone :)
     
  20. Jun 4, 2009 #240 of 286
    dettxw

    dettxw MRVing

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    What with the Network/Internet over coax thread started I guess we better get movin' on that First Look. ;)

    I've got a regular CE anticipation I choose to post here -wouldn't it be cool (however unlikely) that this CE contained the capability to update the SWM firmware over the coax? :D
     

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