Proxim AP-4000 Benutzerhandbuch

Interfaces

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For 802.11b/g -- Auto Fallback, 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbits/sec

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For 802.11g-wifi -- Auto Fallback, 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbits/sec

• DTIM Period: The Deferred Traffic Indicator Map (DTIM) Period determines when to transmit broadcast and multicast 

packets to all clients. If any clients are in power save mode, packets are sent at the end of the DTIM period. This 
parameter supports a range between 1 and 255; it is recommended to leave the DTIM at its default value unless 
instructed by technical support. Higher values conserve client battery life at the expense of network performance for 
broadcast or multicast traffic.

• RTS/CTS Medium Reservation: This parameter affects message flow control and should not be changed under 

normal circumstances. Range is 0 to 2347. When set to a value between 0 and 2347, the Access Point uses the 
RTS/CTS mechanism for packets that are the specified size or greater. When set to 2347 (the default setting), 
RTS/CTS is disabled. See 

 for more information.

• Enable Closed System: When enabled, the AP will not respond to probe requests from client stations requesting 

“ANY.” Enabling closed system will require the client station to configure the SSID of the AP manually.

• Wireless Service Status: Select Shutdown to shutdown the wireless service on a wireless interface, or resume to 

resume wireless service. See 

 for more information.

• Load Balancing Max Clients: Load balancing distributes clients among available access points. Enter a number 

between 1 and 63 to specify the maximum number of clients to allow.

• Channel Blacklist Table: The Channel Blacklist table contains all available channels. It can be used to manually 

blacklist  channels, and it also reflects channels that have been automatically blacklisted by the 

 function.  See 

 for configuration information.

• Wireless Distribution System: A Wireless Distribution system can be used to establish point-to-point (i.e. wireless 

backhaul) connections with other access points. See 

 for configuration 

information.

In order to prevent interference with radar systems and other devices that occupy the 5 GHz band, 802.11a APs certified 
in the ETSI (Europe) and TELEC (Japan) regulatory domains (see 

) and operating in the middle 

frequency band select an operating channel through a combination of Auto Channel Select (ACS) and Dynamic 
Frequency Selection (DFS)/Radar Detection (RD). 

During boot-up, ACS scans the available channels and selects the best channel. Once a channel is selected, the AP 
performs a channel availability check for 60 seconds to ensure that there is no radar on the channel and then 
commences normal operation. When the AP enters normal operation, DFS works in the background to detect radar 
interference on that channel.

If interference is detected, the AP sends a trap, disassociates all clients, blacklists the 

channel, and reboots. After it reboots, ACS re-scans and selects a better channel that is free of interference. 

If ACS is disabled, only channels in the lower frequency band are available for use:

• 36: 5.18 GHz (default)
• 40: 5.200 GHz
• 44: 5.220 GHz
• 48: 5.240 GHz