SMC Networks Gateway TTTM5800X - Manual (Page 30)

All Rights Reserved. Copyright 2006 Teletronics International, Inc.
2 Choke Cherry Road, Rockville, MD 20850 Tel: 301.309.8500 Fax: 301.309.8851
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 200mW
• Channel 149 = 5.725 – 5.745
• Channel 153 = 5.745 – 5.765
• Channel 157 = 5.765 – 5.785
• Channel 161 = 5.785 – 5.805
• Channel 165 = 5.805 – 5.825
Special Atheros Turbo Mode Channels
*Use this setting only when both side of the wireless connection is using the Atheros chipset. The radio will combine 2
free channels for the wireless transmission to double the bandwidth.
• Channel 42 = 5.210
• Channel 50 = 5.250
• Channel 58 = 5.290
• Channel 152 = 5.760
• Channel 160 = 5.800
Wireless Security Mode
There are 3 Wireless Security Mode you can choose: WEP, WPA-Personal and WPA-Enterprise.