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E3000 2.4G 150M only?

Discussion in 'Tomato Firmware' started by Noodle, Oct 9, 2012.

  1. Noodle

    Noodle Addicted to LI Member

    Hi Forum,

    I'm using Tomato USB on a Linksys E3000. I can get 300M on 5G, but maximum 144M or 130M on 2.4G only. If I use single stream wifi card, I got 65M only. Is this normal? or I missed some thing.

    Little background:
    Different SSID on 5G and 2.4G. Both using WPA2-AES, Both using 40M width. 2.4G using channel 1 and no conflict. 5G using 149 and no conflict. N only on 5G, Auto on 2.4G. Also tried N only on 2.4G, same result.

    This was tested from MacBook Pro (which use BCM43xx) and AR9280. I also tested 2.4G with 20M channel width, same as 40M channel width. Looks like it's not using 40M channel width.

    Also tested channel 6 (upper and lower) and channel 11 (upper), same thing.

    Any idea?


  2. lefty

    lefty Networkin' Nut Member

    what kind of wireless adapter do you have? if its a 1Tx1R then yes,normal, and also would explain why it doesn't see the HT40 dual channels as well. and most likely, if its the built in adapter, then good chance they are both 1x1.
  3. Noodle

    Noodle Addicted to LI Member

    As I mentioned, I'm using BCM43xx (I assume it's BCM4331 or 4311) on MacBook Pro and AR9280. Both are dual band. And Both get 300M on 5G, but 144/130M on 2.4G.


  4. lefty

    lefty Networkin' Nut Member

    Yes i read the post... but that only tells me the chipset, not the brand. A broadcom BCM4718 is capable of both 2.4 and 5Ghz and is in the Asus RT-N16 but the RT-N16 is locked down to where it can only do 2.4Ghz band, so knowing the brand is helpful. If it is a BCM4331 it shouldn't be a problem, thats a 3x3 but i mainly see that in routers, the newer AC routers to be exact, and most times i see it, its a 5Ghz radio with 3 spatial streaming.

    The Atheros adapter is 2x2 MIMO configuration which features downshift to 1x1 MIMO with Dynamic MIMO Power Save. So i would look into the adapter properties and see if its something you may need to adjust.
  5. Noodle

    Noodle Addicted to LI Member

    Thank lefty,

    I'm not very sure if the question is about router brand or adapter brand, I will provide both here.

    The router is Linksys E3000, and according to Tomato status page, chipset: Broadcom BCM4716 chip rev 1 pkg 10

    MacBook Pro is a 15-inch, Mid 2010, card type is: AirPort Extreme (0x14E4, 0x93). Not sure if it's 4311 or 4321, but should have 2x2 MIMO (not 3x3).

    AR9280 is a Dell DW 1515. It's been used in a Hackintosh.

    E3000 has both 2.4G and 5G enabled and both using 40Mhz. Both 5G client can get 300M, but only 130M or 144M in 2.4G.

    Thanks a lot for looking into this.

  6. lefty

    lefty Networkin' Nut Member

    As i have found looking around and reading on smallnetbuilder:

    "Manufacturers also have the option of not supporting 40 MHz operation in 2.4 GHz at all, which is the choice Apple continues to make for all its wireless products."

    Which is probably the main culprit here, so its not that your adapters don't have the capability, its that Apple decided not to allow HT40 operation in the 2.4 band. As far as the Atheros adapter is concerned, if it came out of the hackintosh, it may be facing the same problem, locked down to where it won't do HT40 in the 2.4 spectrum.
  7. Toastman

    Toastman Super Moderator Staff Member Member

    Two points of general interest:

    1) The RT-N16 was designed to use an extra wireless card, but it was never fitted in production. However, you can see all the tracks on the bottom of the PCB, and some people have actually added it successfully. The built in second 5GHz wireless on the Broadcom chipset seemed to have been ditched in favour of the extra card ... perhaps the performance was considered poor?

    2) Originally, 40MHz was not to be allowed on 2.4G, but this was changed and now the whole band is screwed. Many reputable RF engineers objected to this but were overridden. To their credit, Apple and Intel did at least try to find a way out of this mess.
    lefty and koitsu like this.
  8. lefty

    lefty Networkin' Nut Member

    Its of course quite possible that either it was deemed poor performance, or it could have been deemed that running both bands on a single chip simultaneous could have been to much of a performance blow to the CPU itself, create un-needed heat to the CPU etc., the RT-N16 already comes down clocked from its original speed of the chip spec which is 533Mhz, by lowering the CPU to 480Mhz and locking down the 4718 to where it could only do the 2.4 spectrum, they probably deemed this to be the more acceptable performance for this unit, noise/heat/throughput wise. who knows?... but i notice that all the BCM47xx chip series 5Ghz radio performance range wise to be somewhat poor, so it wouldn't be surprising.
  9. Noodle

    Noodle Addicted to LI Member

    Thank you all for the information. I guess lefty is right. Apple decide to limit 2.4G on HT20 only. I tried same card (AR9280) on Linux, and I see 300M on 2.4G as well as 5G.

    Thanks a lot, I love this forum.


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