Mix Matching Brands

Discussion in 'Wireless Internet' started by Ron, Aug 10, 2004.

  1. Ron

    Ron Guest

    What is everyones experience with mixing equipment. Such as netgear AP and
    using linksys cards???...anyone had any problems with this?

    Ron
     
    Ron, Aug 10, 2004
    #1
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  2. What is everyones experience with mixing equipment. Such as netgear AP
    Most people have no choice but to mix (they get a wireless card built into
    their machine and the AP is provided by their coffee house, or their job,
    or their conference center, ...).

    I still haven't had a chance to try my hardware in a non-mixed
    environment ;-)


    Stefan
     
    Stefan Monnier, Aug 10, 2004
    #2
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  3. Ron

    Duane Arnold Guest

    It increases the finger pointing if you start having problems, IMHO

    Duane :)
     
    Duane Arnold, Aug 10, 2004
    #3
  4. Well, every time you use a wi-fi hotspot (coffee shop, skool network,
    corporate LAN), you're probably using a mixed system. However, most
    of those are 802.11b or perhaps 802.11g.

    Where you can get into trouble are the proprietary enhancements such
    as 4X, 22Mbits/sec, Super-G, SpeedBooster, and such. In general, you
    need matching equipment to take advantage of the peformance
    enhancements.

    Another place are transparent bridges connecting two LAN's. There's
    no real standard wireless transparent bridge protocol, so you'll
    probably need to use identical hardware at each end of the bridge.
    Similarly, WGS is a relatively new proprietary protocol what usually
    requires compatible hardware support. In general, you can often get
    away with using different manufacturers that use the same chipset, but
    compatibility should be investigated before buying.

    Another potential problem is mixing 802.11g and 802.11b radios.
    802.11g is rather polite and slows down when in the presence of
    802.11b signals. If you want to build your own indoor 802.11g
    network, you should use all 802.11g equipment to prevent any slow
    downs. However, they need not be from all the same vendor as 802.11g
    is a published standard and well supported.

    If you're not sure, or have a paranoid fear of failure, check the
    corresponding Wi-Fi certifications at:
    http://www.wi-fi.com/OpenSection/certified_products.asp?TID=2
    which insures that at least someone looked at the standards compliance
    for the equipment in question.
     
    Jeff Liebermann, Aug 10, 2004
    #4
  5. Ron

    Steve Pearce Guest

    I bought a Netgrear WG511 and a Netgear WG602v2. Had nothing but
    trouble with the WG511 (BSOD after coming out of standby). Finally
    changed it for a Buffalo G54, that works well with the WG602v2.
     
    Steve Pearce, Aug 10, 2004
    #5
  6. Ron

    Bob Alston Guest

    Can someone clarify for me, or point me to an explanation on how 802.11g
    "slows down" when in the presence of "b" signals?
     
    Bob Alston, Aug 10, 2004
    #6
  7. On Tue, 10 Aug 2004 17:24:33 GMT, "Bob Alston" <bobalston9
    See:

    http://www.computerworld.com/mobiletopics/mobile/story/0,10801,81450,00.html?nas=PM-81450
    http://www.computeruser.com/articles/daily/8,10,1,0315,04.html

    The basic problem is that 802.11 and 802.11b send their managment
    frames at the slowest possible speed (1Mbit/sec) so that all radios
    can receive broadcasts, flow control packets, beacons, etc. This is
    where much of the overhead comes from.

    In a pure 802.11g system, management packets are sent as the
    connection speed. (I'm not sure about this but will check the specs
    later). During idle periods, the 802.11g radio is suppose to listen
    for compatible 802.11b managment frames at 1Mbit/sec. If it hears
    just one frame, the 802.11g access point slows down to compatible
    speeds for a few seconds. I'm not sure exactly how the transition
    process works, but there's a substantial slowdown during the speed
    transition and negotiation.

    Some access points have an "802.11g only" mode, that literally ignores
    802.11b packets.

    Here's an example of one such slowdown:
    http://www.tomsnetworking.com/Sections-article43-page2.php
    Note the big drop in the graph. However, note that even with the drop
    in speed, 802.11g is faster than 802.11b.

    If you're really into it, you might wanna read both articles (24
    pages):
    http://www.tomsnetworking.com/Sections-article42-page1.php
    http://www.tomsnetworking.com/Sections-article43-page1.php
     
    Jeff Liebermann, Aug 10, 2004
    #7
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