Netgear FVM318 FVM318 Reference Manual - Page 144

Reference Manual for the Model FVM318 Cable/DSL ProSafe Wireless VPN Security Firewall Note: The AP and the client adapters can have different default WEP Keys as long as the keys are in the same order. In other words, the AP can use WEP key 2 as its default key to transmit while a client adapter can use WEP key 3 as its default key to transmit. The two devices will communicate as long as the AP's WEP key 2 is the same as the client's WEP key 2 and the AP's WEP key 3 is the same as the client's WEP key 3. Wireless Channel Selection IEEE 802.11 wireless nodes communicate with each other using radio frequency signals in the ISM (Industrial, Scientific, and Medical) band between 2.4 GHz and 2.5 GHz. Neighboring channels are 5 MHz apart. However, due to spread spectrum effect of the signals, a node sending signals using a particular channel will utilize frequency spectrum 12.5 MHz above and below the center channel frequency. As a result, two separate wireless networks using neighboring channels (for example, channel 1 and channel 2) in the same general vicinity will interfere with each other. Applying two channels that allow the maximum channel separation will decrease the amount of channel cross-talk, and provide a noticeable performance increase over networks with minimal channel separation. The radio frequency channels used are listed in Table 8-1: Table 8-1. 802.11 Radio Frequency Channels Channel 1 2 3 4 5 6 7 8 9 10 11 12 13 Center Frequency 2412 MHz 2417 MHz 2422 MHz 2427 MHz 2432 MHz 2437 MHz 2442 MHz 2447 MHz 2452 MHz 2457 MHz 2462 MHz 2467 MHz 2472 MHz Frequency Spread 2399.5 MHz - 2424.5 MHz 2404.5 MHz - 2429.5 MHz 2409.5 MHz - 2434.5 MHz 2414.5 MHz - 2439.5 MHz 2419.5 MHz - 2444.5 MHz 2424.5 MHz - 2449.5 MHz 2429.5 MHz - 2454.5 MHz 2434.5 MHz - 2459.5 MHz 2439.5 MHz - 2464.5 MHz 2444.5 MHz - 2469.5 MHz 2449.5 MHz - 2474.5 MHz 2454.5 MHz - 2479.5 MHz 2459.5 MHz - 2484.5 MHz B-18 Network, Routing, Firewall, and Wireless Basics