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Configuration Parameters 30
Channel
802.11a devices spread a radio signal over a range of frequencies. The IEEE 802.11a
specification allocates the available frequencies in the 5 GHz band into a series of
operating Channels that are identified by a Channel number and a center carrier
frequency.
An 802.11a network adapter configured for Infrastructure mode receives a Channel
assignment from its Access Point. You cannot configure the Channel for an adapter
operating in Infrastructure mode.
For an Ad Hoc network, all nodes must use the same Channel to communicate. You
can configure the adapter to scan multiple Channels to locate an Ad Hoc network or
you can configure it to use a specific Channel. See “Station Configuration” on
page 39 for details.
The number of available Channels varies by region.
For United States and Canada:
An 802.11a network adapter can use one of eight Channels in 802.11a-compliant
mode: Channel 36 (5.18 GHz), Channel 40 (5.20 GHz), Channel 44 (5.22 GHz),
Channel 48 (5.24 GHz), Channel 52 (5.26 GHz), Channel 56 (5.28 GHz), Channel 60
(5.30 GHz), or Channel 64 (5.32 GHz).
An 802.11a network adapter can use one of three Channels in 2X mode: Channel 42
(5.21 GHz), Channel 50 (5.25 GHz), or Channel 58 (5.29 GHz).
If you wish to install multiple Ad Hoc networks in the same vicinity, Proxim
recommends that you configure each network with a unique Channel to avoid
interference between networks. Keep in mind that each Channel in 2X mode overlaps
multiple Channels in 802.11a mode. For example, if an Ad Hoc network in 2X mode is
using Channel 50, do not configure nearby networks in 802.11a mode for Channel 42,
48, 52, or 56.
Note: See “Radio Frequency Interference Requirements” on page 12 for important
regulatory information concerning Channel selection.
For Europe:
An 802.11a network adapter can use one of eight Channels: Channel 36 (5.18 GHz),
Channel 40 (5.20 GHz), Channel 44 (5.22 GHz), Channel 48 (5.24 GHz), Channel 52
(5.26 GHz), Channel 56 (5.28 GHz), Channel 60 (5.30 GHz), or Channel 64 (5.32 GHz).
Adapters sold in Europe will automatically receive a Channel assignment from their
Access Points. These adapters do not support Ad Hoc mode.
For Japan:
An 802.11a adapter can use one of four Channels: Channel 34 (5.17 GHz), Channel 38
(5.19 GHz), Channel 42 (5.21 GHz), or Channel 46 (5.23 GHz). If you wish to install
multiple Ad Hoc networks in the same vicinity, Proxim recommends that you configure
each network with a unique Channel to avoid interference between networks.