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Intel 4965AGN: US Mode vs EU/JP mode (channels difference)

Discussion in 'Networking Issues' started by arlab, Dec 30, 2007.

  1. arlab

    arlab LI Guru Member

    I have an US Intel Wireless Wi-Fi Link 4965AGN card.
    I need to change it to an European one (also Intel Wireless Wi-Fi Link 4965AGN), because of the extra channels (12 and 13).

    To do this, do I just need to change a configuration (via software) or I have to buy a new one and install it (the cards are physically different)?

    I saw this post on Intel: http://www.intel.com/support/wireless/wlan/sb/CS-006064.htm,
    but it's not clear whether what Intel was saying is only applicable to Japanese/European cards... Those cards have to receive/transmit in less channels, but the US ones have to receive/transmit in more channels...
     
  2. HennieM

    HennieM Network Guru Member

    Intel says your card, whether it's a US, JP, or EU card, will pick up (and connect to-) channels 12 thru 14 when an AP in the vicinity transmits on those channels.

    I have found this to be true, but the card sometimes takes a while to pick up an AP on channels above 11. Sometimes it does not pick up ANY AP/any channel with WZC, Netstumbler, or even with a forced scan under Linux.

    Assuming you run Windows.

    For Ad Hoc (IBSS) it only allows channels 1 thru 11. However, you can fiddle it with this key.

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\##AdapterNumber##
    where ##AdapterNumber## is a number like 0000, 0001, 0002, etc.

    find your ##AdapterNumber##, and then change the key
    ChannelMaskBand24G or ChannelMaskBand24B
    to 3FFF

    If the number you have inthere is already bigger than 3FFF (in binary this is 14 ones), leave it.

    Something changes the ChannelMaskBand24G number back to 7FF or something else at some stage (like when you shut down/start again), but at least for a while you can then select, in the card driver's setup, channels 1 thru 14 for IBSS mode.

    These Intel cards, or perhaps the Intel drivers, are utter crap IMHO. It can not be a hardware thing to limit channels, only driver. I'll take an Atheros card (and proper driver) over these Intel ones any day of the week, but I have this 4965 built-in so....
     
  3. Toxic

    Toxic Administrator Staff Member

    my guess is he wont be using Adhoc though. he maybe able to force a manual install and force the EU drivers onto this card. I do this on my Buffalo Wireless Card and force the latest Broadcom drivers on it. the other way is he should be able to compare the difference between the EU and US *.inf files and change it then install the drivers as normal.

    is be able to select location (country) in the advanced setting of the driver?
     
  4. arlab

    arlab LI Guru Member

    Thanks for the quick reply.

    But that would happen even if the card was from EU/JAP, right? I mean, it doesn't take more time to pick up an AP on channels above 11 in a USA card, am I wrong?

    Also, in Europe is the "infrastructure mode" used by default? So, if I change my card to that mode of operation it should all be OK? Or, for it to be completely equivalent to the European mode of operation, further customizing is needed?

    This, because even though I have an American card, I live in Europe (and I'm not expecting to visit the US any time soon).
     
  5. HennieM

    HennieM Network Guru Member

    Yes, no matter if you have a US, EU, or JP card - in infrastructure mode you will (eventually) pick up and connect to any channel 1 thru 14.

    @Toxic: That's just the point - the Intel driver does not, i.t.o. channels, differentiate in the driver between US, EU, and JP. It's a one-fits-all in the driver, so even if you try to force something by fiddling settings to ETSI, it gains you nothing. The only difference in driver between ETSI and FCC I can see, is the use of the "extra" channel in N-mode, and possibly some Tx strengths.
     
  6. arlab

    arlab LI Guru Member

    Glad to know it. Thanks for the help.
     
  7. arlab

    arlab LI Guru Member

    Just received this e-mail from Intel:

    This is from another e-mail I received (also from Intel):

    So, there are differences between cards. But, I don't think that this means that US cards can't receive/transmit the additional channels. So, there's probably no need for those who have an US card to replace it.
     
  8. HennieM

    HennieM Network Guru Member

    Well, I have an MOW2
    MPCIEX_Lenovo_4965_AG_XP_MOW2 , PCI\VEN_8086&DEV_4230&SUBSYS_10118086
    and it sure takes a long time to find my AP on channel 13, if it finds it at all... I sometimes have to disable/enable the wireless adapter repeatedly before it will find channel 13 - VERY frustrating....

    Another AP on channel 6 is usually picked up right away.

    I think the "differences" may only be in the marking (SUBSYS_....) which in turn, identifies (IMO) only the section to use in the INF file - nothing else. As mentioned, the differences among sections in the INF file are not major, and G/B channel selection or something similar does not feature anywhere.

    Does anybody have an idea how to disable the hardware background channel scanning under XP?
     

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