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802.11g Short and Long Preamble

2 posts by 2 authors in: Forums > Wi-Fi Alliance Certifications & the 802.11 Standard
Last Post: March 12, 2005:
  • By freedom900
    Reply

    when we can use the long and short preamble and why??what is the differences in the throughput 802.11g preambles?? which preamble we have to use, if we have 802.11b station and we have 802.11g AP which preamble we have to use. and if we have only 802.11g which one we will use.

  • By Criss_Hyde
    Reply

    Hi Freedom:

    The DSSS PHY uses only long preamble.

    The HR/DSSS PHY (802.11b) introduced the short preamble and made it optional. If there are no stations around that only support the long preamble then the short preamble is used by all. Else the long preamble is used by all.

    The ERP PHY (802.11g) requires both long and short preamble support. Again, if there are no stations around that only support the long preamble then the short preamble is used by all. Else the long preamble is used by all.

    I hope this helps. Can you please add your location to your forum profile? Thanks. /criss

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