Hence the
occupancy time on any channel cannot be >0.4 s within a 10 s period. In addition, a 1 W
limit is allowed for systems employing at least 50 hopping channels with the use of
antennas with directional gains that do not exceed 6 dBi, giving a maximum total radiated
power of 4 W effective isotropic radiated power (EIRP). FHSS is adopted mainly in North
and South America, though with a slight difference in the total bandwidth in different
countries.
7.2.3 RFID Protocol
The idea behind standardization of RFID protocols is to have a uniform air interface and
command set between an RFID reader and an RFID tag, so that an RFID reader produced
by a company can be integrated into an RFID network setup by another company. There
are two standards although they are basically the same. The ?¬?rst one is the ISO=IEC
18000-6:2004 Amendment 1: information technology??”RFID for item management??”Part 6:
parameters for air interface communications at 860??“960 MHz (ISO, 2004), which is
based on the recommendation of the second standard, EPC Class 1 Generation 2 Protocol
??????EPC Radio-frequency Identi?¬?cation Protocols Class 1 Generation 2 UHF RFID Protocol
for Communication at 860 MHz??“960 MHz??™??™ (EPCglobal, 2004), in short EPC C1G2, by
EPCglobal. This protocol outlines the air interfaces and commands between an RFID
reader and an RFID tag.
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