Nortel BayStack 650 User Manual

Also see for BayStack 650: Reference guide Release note Supplementary guide User guide Install guide

Contents

Using the BayStack 650/660 Wireless LAN PC Card2-12 203113-BTable 2-4. Expert SettingsItem DescriptionRTS Threshold Enter a number for the RTS threshold. As on wired networks, packetssent by wireless LANs are susceptible to collisions. An RTS thresholdof 2305 (default) effectively disables the RTS mechanism, whilemaintaining optimum performance. Decreasing this value reduces theprobability of collisions, but may affect performance.Nortel Networks recommends not changing the RTS threshold value onthe access point, unless many overlapping access points service thecoverage area. Enter a value between 0 and 2305 bytes if required.Nortel Networks suggests a value of 128.FragmentationThresholdEnter a number for the fragmentation threshold. This option helpsprevent radio frequency interference from other devices that operate inthe 2.4 GHz band. The default value of 2305 effectively disablesfragmentation of data packets, while maintaining optimum performancein an environment that is free of interference. Decreasing this valuereduces the probability of packet errors due to interference from otherdevices, but may affect performance. Enter a value between 0 and2305 bytes if required. Nortel Networks suggests a value of 550.Listen Interval This parameter can only be set if Power Save is enabled on theAdvanced tab. Power Save automatically makes the BayStack PC cardinactive when transmission of data packets stops. The Listen Intervalsets the time interval for the PC card to start-up and check for queueddata that may have been sent. This adjusts the power saving levelsaccordingly.The settings on the Listen Interval are based on the settings of theExpert parameters set on the access point: Beacon Interval and DTIMPeriod. Refer to the appropriate documentation for more information onthese parameters. Selections include:• Every TIM (Minimum): This setting causes the wireless LANadapter to wake up more often than the “Every DTIM” Setting.It uses slightly more power when no data is being sent, but reducesthe latency delay when starting a new data transfer (from theinfrastructure to the mobile workstation).• Every DTIM (Recommended): This is the default andrecommended value. This setting causes the wireless LAN adapterto wake up for every DTIM sent by the access point.• Every __ ms: This setting causes the wireless LAN adapter to wakeup at a custom defined interval, which is specified in milliseconds.The initial value is 263ms. With the default expert settings in theAccess Point of the Beacon Interval=128 TUs and DTIM Period=5,this is equivalent to waking up for every second TIM. (Note:1TU=1024 microseconds).