es a redundant bit pattern called what? A chipping code b. A spreading code c. A spectrum code d. A direct code 7. The convergence sublayers in the WiMAX MAC protocol allow it to suppont a. TI b. ATM c voice and video d. all of the above 28. In the uplink direction, 802.16 transmits using a TDMA b. half-duplex only c. TDM d. the downlink frame 29. What system, sometimes called fiber less optical, uses low-powered infrared beams instead o fiber-optic cable? a. MMDSs .LMDS c FSO d. WiMAX 30. What is the most basic type of IEEE 802.11 LAN that can operate without an AP? Basic Service Set (BSS) a. b. Extended Service Set (ESS) c Independent Basic Service Set (IBSS) d. Distribution System (Ds) 31. What is defined as two or more Basic Service Sets (BSs s) connected by a common distribution system? A. Extended Distribution System B. Extended Service Set C. Independent Basic Service Set D. Basic Service Set 32. What is the purpose of the SID on a cellular phone or SIM card a to identify the user b. to identify the carrier c to identify the phone d. to identify the area in which the user is located