A transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with a 13 dBi gain, what is the resultant power output in mW at the antenna?
Answer(s): D
Net Gain= -3 dB + 13 dBi = + 10 dBi which represents a tenfold increase in power.Resultant output Power = 10 times input power= 10 X 50 mW = 500 mW
What is the maximum frequency hop separation of a 2.4 GHz FHSS system (in MHz)?
Answer(s): C
For FHSS systems, IEEE 802.11 defines 79 different hops for the carrier frequency. Using these 79 frequencies, IEEE 802.11 defines 78 hopping sequences (each with 79 hops) grouped in three sets of 26 sequences each. Sequences from same set encounter minimum collisions and therefore may be allocated to collocated systems. Theoretically, 26 FHSS systems may be collocated, but collisions will still occur in significant amounts. To lower the amount of collisions to acceptable levels, the actual number of FHSS collocated systems should be around 15.All the above is correct for the case in which the FHSS collocated systems are allowed to operate independently, without any synchronization among their hopping sequences.If synchronization is allowed, 79 systems could be collocated (theoretically), each one of them using at any moment in time, one of the 79 available frequencies. However, this would require expensive filters in the radio circuitry. Actual products require about 6 MHz separation allowing the collocation of about 12 systems, without any collision! While such synchronization is not always allowed in the unlicensed band of 2.4 GHz, it is common practice in the licensed bands. The possibility of having collocated systems without collisions, has a tremendous impact on the aggregate capacity / throughput of the installation as well as its efficiency in terms of bps per Hz.
Which of the following descriptions characterizes the IEEE 802.11 shared-key authentication scheme handshakes?
The 802.11 standard also includes an optional, more advanced form of authentication referred to as shared key authentication. This is a four step process. The client sends an authentication request frame, and the access point responds with a frame containing a string of characters called challenge text.
Which of the following integrated devices do Access Points typically provide?
Answer(s): C,D
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