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Notwithstanding the widespread use of this philosophy in telecom, IEEE 802.9 and 802.6 and its further proposal for next generation 802.9,  X  this approach may result in serious negative technical and economic  X consequences when applied to the 802.11 medium . In addition, there will be reduced compatibility with Asynchronous Transfer Mode cell relay technologies, and the synchronous timing is a material impediment to autonomous operation. The explanation for these assertions is the substance of this contribution. ` ` The alternative is a purely asynchronous medium in which each new use may follow the previous use as soon as the channel is available. There is no timing structure that is a factor in when a station may transmit. Time can then be managed adaptively and in response to demand by an intelligent central controller where high capacity and utilization are required, and in a more casual way when capacity is not pressed. ` ` Tables are shown which itemize and compare regularly slotted and asynchronous time division of the physical medium. In addition, the medium functions are tabulated for the common access method on both pair and wireless transmission mediums. ` ` The asynchronous messagebased access method has been described in previous contributions 9119 and 9195. In contribution 93/24 now submitted, the adaptation to direct use of 802.6 defined ATM cells is described; and in contribution 9325, the radio PHY for this context is described.&,((nn  P  XX   #X~xP7kXP# "COMPARISON OF REGULAR AND ASYNCHRONOUS  P l TIME DIVISION MULTIPLEXING OF THE WIRELESS PHY ă #&n P7 U&P# Table of Contents `!(#YPageă    X BACKGROUND pR"(#Z 1 X PRIMARY CONSIDERATIONS FOR MAC OR PHY LEVEL MULTIPLEXING pR"(#Z 1 X CONTRAST BETWEEN REGULAR TIMESLOTTED  AND ASYNCHRONOUS OPERATIONpR"(#Z 2 XX` ` Uniform Periodic Frames Suballocated ` pR"(#Z 2 XX` ` X ` ` An Octet Per Frame in PCM pR"(#Z 2 XX` ` X ` ` A Control Field Per Frame in LAN pR"(#Z 2 XX` ` Suballocation of Frames ` pR"(#Z 4 XX` ` X ` ` Slot Size Selection pR"(#Z 4 XX` ` X ` ` Slots Too Wide and Too Narrow pR"(#Z 4 X ADDRESSING PRACTICE pR"(#Z 4 X SPECIAL CONSIDERATIONS FOR MULTIDROP TELEPHONE PAIR MEDIUMS pR"(#Z 5 X SPECIAL CONSIDERATIONS FOR WIRELESS MEDIUMS pR"(#Z 5 XX` ` Station Initiated Five Step Handshake Data Transfers ` pR"(#Z 6 XX` ` Channel Manager Originated Data Transfers ` pR"(#Z 6 XX` ` Autonomous PeertoPeer Data Transfers ` pR"(#Z 6 XX` ` Length of Data Transfers ` pR"(#Z 7 XX` ` Technical Challenges ` pR"(#Z 7 XX` ` Extended Service Area System Architecture ` pR"(#Z 7 XX` ` ARQ for ConnectionType Services ` pR"(#Z 7 X ASYNCHRONOUS TIME ALLOTMENT pR"(#Z 7 XX` ` Comparison Comments ` pR"(#Z 7 X CONCLUSION pR"(#Z 8 Figures and Tables Figure 1 Protocol Stacks for PHY and MAC Level Multiplexing ` ` of Isochronous and Packet Services p"(#\1 X Table I Comparison of TimeSlotted and Asynchronous Applications pR"(#Z 3 X Table II Comparison of Funcions and Requireents for Pair Wired  ` ` and Radio Wireless Integrated Services Local DistributionpR"(#Z 6 X Table III Comparison of TimeSlotted and  ` ` Asynchronous Access MethodpR"(#Z 8   &.++BB  R   (## X~xP7kXP# " COMPARISON OF REGULAR AND ASYNCHRONOUS  P l TIME DIVISION MULTIPLEXING OF THE WIRELESS PHY ă #&n P7 U&P#  S ԇ X` hp x (#%'0*,.8135@8: