First Look: DirecTV 21 tuner 3D2 SWM LNB

Discussion in 'DIRECTV General Discussion' started by dpeters11, Dec 17, 2015.

  1. slice1900

    slice1900 Well-Known Member

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    Ah yeah I didn't consider the geometry of the LNB. I guess that's another reason for Directv to concentrate everything that matters in 99/101/103 since there would be only one Ku slot and thus no spacing to worry about on the SL3 LNB.
     
  2. CuttySnark

    CuttySnark Member

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    There has to be a setting on AIM that eliminates spot beams as every transponder survey I have seen only had CONUS.
     
  3. slice1900

    slice1900 Well-Known Member

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    From the output of peds48's survey:

    Options: All nationals with spots
     
  4. HoTat2

    HoTat2 Hall Of Fame

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    Correct, the AIM xpndr survey has both options I understand.

    Nationals only or with spots...

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  5. HoTat2

    HoTat2 Hall Of Fame

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    Though it is confusing how the AIM logically list SW1's xpndrs as 1-6 in 103a/1 through 103a/6.

    While the system tables spooling from the satellites confusingly repeats xpndr numbers 3 and 4 for xpndrs 5 and 6.

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  6. P Smith

    P Smith Mr. FixAnything

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    SI or AIM's FW ?
     
  7. peds48

    peds48 Genius.

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    correct


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  8. HoTat2

    HoTat2 Hall Of Fame

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    As to which one is confusing?

    The SI tables isn't it?...

    I don't know why DIRECTV engineers don't sensibly assign xpndr numbers 1-6 to SW1's xpndr channels in the tables, but confusingly repeat the numbers 3 and 4 for what should be 5 and 6.

    Thus only xpndrs 1-4 show on the 103(s) screen as active for SW1 when it should logically be 1-6.

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  9. P Smith

    P Smith Mr. FixAnything

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    because SW-1/2 has very complicate huge reconfiguring array of SB tpns ... as you know, TID number is limited in values of unsigned byte, eg total 256 for one net#
     
  10. HoTat2

    HoTat2 Hall Of Fame

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    Well I understand there are TID number range limitations on any given Net.

    But I thought DIRECTV has total freedom to assign any xpndr number to a TID.

    So why can't (according to Tom Speer's latest maps) SW1's TID numbers 44 and 45 be simply given a xpndr number of 5. And TID numbers 38 and 39 xpndr number 6?

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  11. P Smith

    P Smith Mr. FixAnything

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    I'm afraid the answer will not given out ..
     
  12. James Long

    James Long Ready for Uplink! Staff Member Super Moderator

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    My simple answer to your good question:
    DIRECTV has total freedom to assign any xpndr number to a TID.
    They have the freedom to assign numbers that do not make sense to us.
     
  13. tomspeer46

    tomspeer46 Legend

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    This discussion has gotten a little off topic from the original thread. However, the TPN number assignments that now look so baffling, date from when they shifted the transponders that had been on on TPN 5&6 down in frequency so as to not interfere with TPN 9&10 on D12. The reasons are only known for sure by DirecTV, if they even remember why. From our end, figuring out what they had done was a subject of much behind the scenes discussion. I think we are better equipped to figure things like that out, now.
     
  14. HoTat2

    HoTat2 Hall Of Fame

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    Yeah understood. ..

    It is just strange for DIRECTV to have the AIM firmware programed sensibly for SW1's xpndr numbers, but have it goofy in the SI tables this way.

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  15. HoTat2

    HoTat2 Hall Of Fame

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    Also wonder since the AIM's latest firmware seems to have the 5 as yet undefined CONUS xpndrs for D14 (# 9, 10, 12, 22, and 24) omitted in the xpndr survey. This indicates DIRECTV intends to keep operating D14's CONUS payload in this strange configuration for the forseeable future?

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  16. slice1900

    slice1900 Well-Known Member

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    Directv may not consider it worth it to fiddle with those SI tables for purely aesthetic reasons. Especially if this is seen as temporary - i.e. if our speculation is correct and SW1 is phased out completely and CONUS tpns 1-8 are added on 103ca.
     
  17. slice1900

    slice1900 Well-Known Member

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    I still wonder if they aren't doing something weird with those that has to do with 4K or DVB-S2X testing, and just don't want them showing up for some reason.
     
  18. P Smith

    P Smith Mr. FixAnything

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    Seems to me DVB-S2X will not use by DTV, but just simple bonding (using in pair) two tpns for 4K tests;
    as mentioned many times, the bonding is not necessary for 4K linear channel (where is this one ?)
     
  19. slice1900

    slice1900 Well-Known Member

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    Bonding isn't necessary for 4K, but we do know for certain Directv will be bonding two transponders to carry three 4K channels - one of the rare times they've actually commented on the technology they'll be using! Maybe not from day one for the first few 4K channels since it wouldn't be necessary and could create logistical issues, but eventually.

    The question is whether they are using DVB-S2X to achieve those bonded transponders, since bonding isn't part of the DVB-S2 standard. However Directv is under no obligations to follow standards or use them at all. They could tell Broadcom what they want to do and it would either be added to their mass market tuner chip's capabilities or a custom chip designed for Directv. After all Directv created their own DSS standard which they still use for their MPEG2 SD transponders, and Dish violates the DVB-S standard with the small roll off their turbo transponders implement. DSS support is found in many demodulator chips even though it is a Directv only "standard".
     
  20. P Smith

    P Smith Mr. FixAnything

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    I wouldn't say "found", it's included into few chips because of a demand from DTV and attempting to attract DTV's third party HW mfgs to use them in mass production.
     

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