Green/Yellow and coax lengths

Discussion in 'DIRECTV - Coax Networking (private)' started by veryoldschool, Aug 2, 2009.

  1. RunnerFL

    RunnerFL Well-Known Member

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    I have 2 greens and 2 oranges this morning. :)
     
  2. johern

    johern Legend

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    No switches / hubs 3 yellow / 1 green
     
  3. Spanky_Partain

    Spanky_Partain Active Member

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    All of my DECA LED's are green!

    SAT LNB/SWM 3 => PI - 8' RG6
    PI out => SWM/DECA Filter
    SWM/DECA Filter => 8-way splitter in - 3' RG6
    8-way splitter out => two-way splitter - 25' RG6
    two-way splitter => DECA Uplink module 4 - 2' RG6 (this sometimes would turn yellow, but has not in some time now). This module also connects to the PI supplied from the DECA kit, the uplink plugs into a Linksys 5 port switch with an uplink to the router 40' cat5e cable.
    two-way splitter => DECA module 3 - 2' RG6 => R22-200 Sat 1 - and Network Port 1
    8-way splitter out => DECA module 1 - 15' RG6 => HR20-700 Sat 1 and Network Port
    8-way splitter out => DECA module 1 - 20' RG6 => HR20-700 Sat 1 and Network Port
     
  4. johern

    johern Legend

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    SAT SL5-SWM LNB => PI - 25' RG6
    PI out => SWM/DECA Filter
    SWM/DECA Filter => 2-way splitter in - 1' RG6
    2-way splitter out => DECA Uplink module 4 - 1' RG6
    2-way splitter out => 2-way splitter in- 2' RG6
    2-way splitter out => 4-way splitter in 30' RG6
    4-way splitter out => DECA module 1 - 3' RG6 => HR20-700 Sat 1 and Network Port
    4-way splitter out => DECA module 2 - 3' RG6 => HR20-100 Sat 1 and Network Port
    4-way splitter out => DECA module 3 - 3' RG6 => H21-100 Sat 1 and Network Port

    Light status was 3 yellow / 1 green

    Replaced 1' cable between SWM Filter and first 2-way splitter

    Current status ALL green
     
  5. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    So Spanky, Johern, and I all have only splitters in play...no hubs/routers.

    All have all Green C.Link LEDs.

    Coincidence?

    Not sure yet.....but that was the point I was trying to make is that other connection touchpoints (hubs/switches) may somehow impact the LED color somehow....again....still inconclusive.
     
  6. dave29

    dave29 New Member

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    All of my switches come off of my router , and NONE are inline with the DECA setups anywhere along the line. All green, always has been.
     
  7. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    So that makes 4 DECA "all Green C.Link" setups with no switches/hubs in the coax line setup. More data...but still not any kind of certainty that switches/hubs inject something "different" that may cause the Yellow/Orange C.Link LED results.

    Hmmm....
     
  8. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    :confused: You have no router and internet connection?
    1) we all have splitters "in play"
    2) those that have seen changes in the green/yellow, see them from changes in the RF path.

    "Coincidence?"
    What I'm seeing it the DECA to splitter coax length.
    Looking at this from the RF output of the DECA the loss/load/match, for the 550 MHz is:
    Code:
     3'   0.14dB
    10'   0.48dB
    20'   0.95dB
    30'   1.43dB
    40'   1.9dB
    50'   2.38dB
    60'   2.86dB
    70'   3.33dB
    80'   3.81dB
    90'   4.28dB
    100'  4.76dB
    110'  5.24dB
    120'  6.71dB
    It looks like at around 30-40' the cables loss starts to amount to a resistive load to the DECA.
     
  9. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "Frankly" I don't see "where you're going" here.
    IP networking is one thing, and "the cloud" is another.
    The cloud is RF based and changes it coax lengths have show the most changes to the C.Link color/status.
     
  10. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Routers and Internet, of course....other hubs/switches inline within the DECA coax insfrastructure/framework...no.

    It seems odd that all those who have reported with no hubs/switches have all green. They also reflect varied lengths of coax between components and the SWM itself.

    Ideally, it would be neat to get some added "official" information on this phenomenon from DirecTV to help clarify things a bit...and to perhaps identify the "meaning" and "causes" of the colors themselves.
     
  11. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    The only type I have is the HR21 second port. I was using this config, when I had "all green" and my filter mounted to my first splitter. The C.Link changed when I removed the filter [and then later moved it to the LNB].
    SWM to splitter lengths do have an effect, but filter location seems to be it.
    DECA to splitter cable lengths are showing a common trend
    "Well yeah", it's alway nice for someone to share their knowledge. :lol:
     
  12. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    I was just hoping to move us forward from our current episode of "Unsolved Mysteries" for this topic. :D
     
  13. 69hokie

    69hokie Icon

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    Mine have been all green from the getgo. My DECA/network connection is off one of the network switches in my home network.
     
  14. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    Thanks for adding that data to our research roundtable. :)
     
  15. Davenlr

    Davenlr Geek til I die

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    Same here...Internet/1gbit switch, 50' Ethernet to deca, then 50'coax back to 8 way splitter (I could have just put the deca right on the switch, but didnt have a short network cable handy, so used the network outlet in the guest room and used its directv cable as the return (since there in no receiver in that room at the moment).

    Ill go out this weekend if its not raining again, and put the filter inside the lnb arm and let you all know if anything changes in my ALL GREEN setup.

    Then Ill repeak my dish again. We got 13.5 inches of rain in a week, and my dish pole actually moved forward enough from the weight of the dish in the soft ground, to require a 2 point elevation adjustment. I might as well move the filter at the same time I dump a bag of quickcrete on the bottom of the dish mounting pole :)
     
  16. jasonki32

    jasonki32 Godfather

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    Although mine wasn't all green from the getgo(had to move the swm filter to the splitter to achieve this). My DECA connection is off of one of my network switches.
     
  17. carl6

    carl6 Moderator Staff Member DBSTalk Club

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    c.link lights have stayed green for quite awhile now.

    wiring is all very short. all DECA modules are within 3 feet of my router. I might be using a 6 foot ethernet cable to tie in to the LAN. RG6 runs are very short (1 or 2 feet) to the DECA units. My longest ethernet run (to my HR20 which is not on DECA) is about 100 feet.
     
  18. dmricke

    dmricke DBSTalk Club Member

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    I would think that coax is also a reactive load when you consider the capacitance factor.

    I haven't had a lot of free time to play with my DECA system but here is my cable info:

    SWM to filter = 2'
    Filter to splitter = 2'
    Splitter to all 4 DECAs = appx 50'

    All four DECAs are showing yellow lights. I am linking to the rest of my network through the second port on my HR21-700.

    Dale
     
  19. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Transmission lines are relative "neutral". They have capacitance, inductance, and resistance, but it's distributed [equally] along the line, as opposed to "lumped" components.
    The impedance of a load is best described with a Smith's chart plot and line length [changes] simply moves the load around the chart. In doing so the reactive impedance will change, but it's only do to the change in wavelength [distance] and not an added capacitance or inductance.

    Carl's and your setup seem to be the "odd ones" compared to the rest of us, and also may be the ones that completely derail any pattern that seemed to be developing here.
     
  20. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    So am I reading these last few posts wrong?

    We seem to have both long and short length configurations reported as getting yellow/orange C.Link LEDs, which would seem to demonstrate coax length is not a source of that result.
     

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