CHAPTER 8 AP Client Mode Wireless Configuration
Profile
■802.11 Ad hoc: A group of wireless devices connected as an independent wireless LAN. Select “Ad hoc” to associate to a peer computer.
◆Power Saving Mode — Only available when “Infrastructure” is selected as the network type.
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CAM (Constantly Awake Mode): Power saving mode is disabled.
Power Saving Mode: Enables the power save operation.
◆Channel — The radio channel used to communicate with wireless peers in an ad hoc network. The channel has to be the same for all peer computers. (Only available when “Ad hoc” is selected as the network type.)
◆11B Preamble Type — Sets the length of the signal preamble that is used at the start of a data transmission. Use a long preamble (192 microseconds) to ensure connection to all 802.11b devices. When set to Auto, a short (96 microseconds) or long preamble will be used depending on the capabilities of other ad hoc network devices. (Only available when “Ad hoc” is selected as the network type.)
(Default: Auto)
◆RTS Threshold — Sets the packet size threshold at which a Request to Send (RTS) signal must be sent to a receiving station prior to the sending station starting communications. The access point sends RTS frames to a receiving station to negotiate the sending of a data frame. After receiving an RTS frame, the station sends a CTS (clear to send) frame to notify the sending station that it can start sending data. If the RTS threshold is set to 0, the access point always sends RTS signals. If set to 2347, the access point never sends RTS signals. If set to any other value, and the packet size equals or exceeds the RTS threshold, the RTS/CTS (Request to Send / Clear to Send) mechanism will be enabled. The access points contending for the medium may not be aware of each other. The RTS/CTS mechanism can solve this “Hidden Node Problem.” (Range:
◆Fragment Threshold — Configures the minimum packet size that can be fragmented when passing through the access point. Fragmentation of the PDUs (Package Data Unit) can increase the reliability of transmissions because it increases the probability of a successful transmission due to smaller frame size. If there is significant interference present, or collisions due to high network utilization, try setting the fragment size to send smaller fragments. This will speed up the retransmission of smaller frames. However, it is more efficient to set the fragment size larger if very little or no interference is present because it requires overhead to send multiple frames. (Range: 256- 2346 bytes; Default: 2346 bytes)
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