Teletronics TT 2400 - Manual (Page 36)

Channel
Channels are important to understand because they affect the overall capacity of your Wireless LAN. A channel
represents a narrow band of radio frequency. A radio frequency modulates within a band of frequencies; as a result,
there is a limited amount of bandwidth within any given range to carry data. It is important that the frequencies do not
overlap or else the throughput would be significantly lowered as the network sorts and reassembles the data packets
sent over the air.
These are the only 3 channels out of the 11 available that do not overlap with one another. To avoid interference within
the network with multiple APs, set each AP to use one of the 3 channels (e.g. Channel 1) and then the other AP to be
one of the other 2 channels (i.e. Channel 6 or Channel 11) within the range of the wireless radio. This simple method
will reduce interference and improve network reliability.
802.11b/g Wireless Channel Frequency Range: 2.4 GHz
– 2.497 GHz
802.11b/g Non-overlapping Channel Frequency Ranges

Channel 1 = 2.401 GHz – 2.423 GHz

Channel 6 = 2.426 GHz – 2.448 GHz

Channel 11 = 2.451 GHz – 2.473 GHz
Americas: Wireless Channels 1
– 11
Asia: Wireless Channels 1 – 14
Europe: Wireless Channels 1 – 13
802.11a Wireless Channel Frequency Range: 5.15 GHz
– 5.35 GHz, 5.725 – 5.825
802.11a is an extension to 802.11 that applies to wireless LANs and provides up to 54 Mbps in the 5GHz band.
802.11a uses an orthogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS. Unlike that
of 802.11b/g, 802.11a standard separate its channels into 3 100MHz segments in the US.
The lower and middle band, accommodate 8 channels in a total bandwidth of 200 MHz and the upper band
accommodates 4 channels in a 100 MHz bandwidth. The frequency channel center frequencies are spaced 20 MHz
apart. The outermost channels of the lower and middle bands are centered 30 MHz from the outer edges. In the upper
band the outermost channel centers are 20 MHz from the outer edges.
In addition to the frequency and channel allocations, transmit power is a key parameter regulated in the 5 GHz U-NII
band. Three transmit power levels are specified: 40 mW, 200 mW and 800 mW. The upper band defines RF transmit
power levels suitable for bridging applications while the lower band specifies a transmit power level suitable for short-
range indoor home and small office environments.
802.11a Non-overlapping Channel Frequency Ranges
Lower Band (5.15 - 5.25 GHz )
– Maximum Output Power 40mW

Channel 36 = 5.15 – 5.18

Channel 40 = 5.18 – 5.20

Channel 44 = 5.20 – 5.22

Channel 48 = 5.22 – 5.25
Middle Band (5.25 - 5.35 GHz )
– Maximum Output Power 200mW

Channel 52 = 5.25 – 5.28

Channel 56 = 5.28 – 5.30

Channel 60 = 5.30 – 5.32

Channel 64 = 5.32 – 5.35
Upper Band (5.725 - 5.825 GHz)
– Maximum Output Power 800mW

Channel 149 = 5.725 – 5.745