Is 802.11b running in this config extract?

MARK HEUZENROEDER · ‎09-04-2007

Hi,

I'm fairy sure it is, by looking at the data rates, but not sure about the modulations.

I know 802.11g uses ofdm, but can I equate cck to 802.11b?

speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0 54.0

power local cck 50

power local ofdm 20

Thanks, MH

Rob Huffman · ‎09-05-2007

Hi MH,

You are most correct! This config does support "b" clients.

On the 2.4-GHz, 802.11g radio, you can set Orthogonal Frequency Division Multiplexing (OFDM) power levels and Complementary Code Keying (CCK) power levels. CCK modulation is supported by 802.11b and 802.11g devices. OFDM modulation is supported by 802.11g and 802.11a devices.

From this doc;

http://www.cisco.com/en/US/products/ps5853/products_configuration_guide_chapter09186a008067e8e9.html#wp1017196

CCK Complementary code keying. A modulation technique used by IEEE 802.11b-compliant wireless LANs for transmission at 5.5 and 11 Mbps.

Orthogonal Frequency Division Multiplex (OFDM) A modulation technique used by IEEE 802.11a-compliant wireless LANs for transmission at 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.

Note The client must support the basic rate that you select or it cannot associate to the wireless device. If you select 12 Mbps or higher for the basic data rate on the 802.11g radio, 802.11b client devices cannot associate to the wireless device's 802.11g radio.

http://www.cisco.com/en/US/products/ps5853/products_configuration_guide_chapter09186a008067e8e9.html#wp1134649

Hope this helps!

Rob