Lancom L-310agn Wireless Manual
Also see for L-305agn Wireless: Manual
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Contents
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LANCOM L-300 Access Point series Chapter 1: Introduction19ENTransmitting data in shorter intervals thus increases the maximum datathroughput when using improved OFDM modulation, two parallel datastreams and transmission at 40 MHz to 300 Mbps.1.2.4 The MAC layerFrame aggregationThe improvements in the physical layer brought about by the new 802.11n ini-tially describe only the theoretical data throughput of the physical medium.However, the share of this theoretical bandwidth that is actually available forpayload data is limited by two factors: in addition to the actual payload data, each data packet in a wireless LANsystem contains additional information such as a preamble and MACaddress information. Time is lost to the management events that occur when the transmissionmedium is actually accessed. Thus the transmitter must negotiate accessauthorization with the other receivers before transmitting each datapacket (frame); further delays are caused by data packet collisions andother events.This loss, referred to as "overhead", can be reduced by combining several datapackets together to form one large frame and transmitting them together. Inthis process, information such as the preamble are only transmitted once forall the combined data packets and delays due to negotiating access to thetransmission medium only occur at longer intervals.The use of this method, known as frame aggregation, is subject to certainrestrictions: As information such as MAC address only needs to be transmitted oncefor the aggregated frame, only those data packets intended for the sameaddress can be combined.3,2 μs 0,8 μs0,4 μsOFDM Symbol3,2 μsPayload data |
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