... 2Station 3Station 4Station 5DIFS DIFS DIFS DIFSFrameFigure 3.3 Basic access mechanism.be idle for a time interval greater than a Distributed Interframe Space (DIFS), the stationtransmits ... coverage is divided into 4, 8, 12,16, or 24 sectors.The user accesses the network through Hybrid Fiber Radio (HFR), Radio To TheBuilding (RTTB) and Radio To The Curb (RTTC). In HFR, a Radio Frequency ... the radio interface ofwireless users. The architecture of ATM multiplexer with radio cell has a central BS andWTs, and can be viewed as a distributed, virtual ATM multiplexer with a radio interfaceinside....