Nortel 2220 Using Manual

Also see for 2220: Product support bulletin Product manual

40 Chapter 2 System Configuration214853-A[Final Draft—Nortel Confidential]Beacon Interval (20-1000)Sets the beacon signal interval. The beacon signals allow the wireless devices tomaintain contact with each other. They may also carry power-managementinformation. (Default: 100 TU)DTIM Period (1-16384)Sets the Delivery Traffic Indication Map (DTIM) packet interval value. The DTIMindicates how often the MAC layer forwards multicast traffic. This parameter isnecessary to wake up stations that are using Power Save mode.The DTIM is the interval between two synchronous frames with broadcastinformation. If you set the value to 2, the access point will save all multicastframes for the BSS and forward them after every second beacon. Having smallerDTIM intervals delivers multicast frames in a more timely manner, causingstations in Power Save mode to wake up more often and drain power faster.Having higher DTIM values reduces the power used by stations in Power Savemode, but delays the transmission of multicast frames. (Default: 5 Beacons)Fragment Length (256-2347)The “Fragment Length” can be set between 256 and 2,346. If the packet size issmaller than the preset Fragment size, the packet will not be segmented.Fragmentation of the PDUs (Package Data Unit) can increase the reliability oftransmissions because it increases the probability of a successful transmission dueto smaller frame size. If there is significant interference present, or collisions dueto high network utilization, try setting the fragment size to send smallerfragments. This will speed up the retransmission of smaller frames. However, it ismore efficient to set the fragment size larger if very little or no interference ispresent because it requires overhead to send multiple frames. (Default: 2347)RTS Threshold (0-2347)Set the RTS (Request to Send) frame length. You may configure the access pointto initiate an RTS frame sequence always, never, or only on frames longer than aspecified length. If the packet size is smaller than the preset RTS threshold size,the RTS/CTS mechanism will NOT be enabled