LENGTH Field in IEEE 802.11b?

The calculation of the LENGTH field depends on the number of bytes to send, as well as on the data rate (5.5 or 11 Mbps). The basic idea of the calculation is.

The calculation of the LENGTH field depends on the number of bytes to send, as well as on the data rate (5.5 or 11 Mbps). The basic idea of the calculation is: Bytes * 8 LENGTH = Time (µs) = ---------------- Data rate (Mbps) However, you need to read Section 18.2.3.5, Long PLCP LENGTH field in the 802.11b-1999 Standard, pages 15-17. It has the complete details of how to calculate this value, along with several examples.It unambiguously explains how to properly round the data, as well as when the length extension bit in the SERVICE field should be set.

I will not reproduce the text of the section here since it looks like IEEE might be strict about enforcing their copyright. However, if you don't have the standard already, I suggest you download it now from the link above -- it's free! If you have any questions about interpreting the standard, don't hesitate to ask.

Thanks a Lot for your help. I will have a look. But I got an idea how to set the LENGTH field.

– Kiran Chandrashekhar 02.117 at 17:49 Just another question regarding the LENGTH field. There was no mention about how to calculate LENGTH for 1Mbps and 2Mbps for 802.11b. If the rate is 1Mbps or 2Mbps ( not 5.5 or 11 Mbps) how do we calculate the LENGTH?

– Kiran Chandrashekhar 02.117 at 18:50 As far as I can tell, 5.5 and 11 Mbps are the only allowed data rates for 802.11b. See the table on en.wikipedia. Org/wiki/IEEE_802.11 – Justin 02.117 at 18:53 Thanks, I was wrong.

I had an impression that even 1Mbps and 2Mbps is part of 802.11b Standard. – Kiran Chandrashekhar 02.117 at 19:04.

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