Performance Test: 802.11b Takes a Lickin' and Keeps on Tickin'
Subject:   what about 2.4ghz phones
Date:   2001-03-30 15:23:04
From:   aminorex
I find my 802.11 unusable in the presence of a
2.4ghz wireless phone.

900mhz phones are fine, though.

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  • what about 2.4ghz phones
    2002-10-10 18:46:34  anonymous2 [View]

    I just got an evaluation model 5.8ghz phone. So far, that range of spectrum is lonely. We'll be testing 802.11a stuff in its presence.
  • what about 2.4ghz phones
    2001-04-04 11:11:15  rflicken [View]

    You mention an 802.11 card-- which one?

    There are two different technologies used in the old 802.11 (non-b) cards: Frequency Hopping, and Direct Sequence Spread Spectrum.

    Most 2.4Ghz phones use Frequency Hopping to try to cope with noise in the band. The problem is that other frequency hopping devices in the same band may get very near into phase with each other, causing noise most of the time! I suspect that your 802.11 card is a freqency hopper.

    The later 802.11 cards (and all 802.11b equipment, like the Lucent gear in this article) use DSSS, which uses one of eleven possible 'channels' and does tricky math to work around errors. This stuff tends to do better in the presence of FHSS, but worse in the presence of other DSSS equipment on the same (or an overlapping) channel.

    Incidentally, I didn't throw a 2.4G phone into the test environment for this article because I don't own one (donations gratefully accepted! =) Although I do have friends who use them happily right along side their home 802.11b networks.

  • what about 2.4ghz phones
    2001-03-30 15:29:59  gbroiles [View]

    Thanks. That's disappointing, and poor planning - people in the market for higher-end home network products are also likely to be interested in higher-tech cordless phones.