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special allocations in which interrogators and tags are separated in their ability to communicate on various channels so that strong interrogator signals will not overpower weaker tag responses Interrogators that are EPC Gen 2 certified use dense interrogator mode when the number of interrogators present in an environment exceeds the number of available channels In North America, dense interrogator mode is used if more than 50 interrogators are installed within a facility In Europe, the mode is used if the number of operating interrogators is greater than 10 if they operate at maximum allowed power Dense interrogator mode allows for coordination of interrogators so that no two interrogators are transmitting at the exact same moment on exactly the same frequency and causing interference within one another s IZs To do this, many interrogators perform frequency hopping and support a function known as listen before talk (LBT) Frequency hopping employs a technology that forces an interrogator to change channels constantly within a given range of frequencies For instance, a UHF interrogator licensed by the FCC for operation in North America must support hopping across 50 channels (each 500 kHz wide) between the frequencies of 902 to 928 MHz and spend no longer than 004 second in any channel during this rotation To perform LBT, interrogators use an antenna (often a dedicated antenna) to listen for the frequency on which the interrogator is about to transmit If another interrogator is communicating in that channel, the interrogator will automatically switch to the next available channel and transmit there instead LBT is often used with frequency hopping and is required in Europe for dense interrogator operations Other forms of dense interrogator mode include spectral allocation, time slice interrogator control, software synchronization, and hardware timing controls of interrogator platforms Spectral allocation designates a portion of the allotted frequency range for each type of communication This allows tags to talk in different channels than interrogators, which prevents them from interfering with one another
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Know that spectral allocation is the preferred method used by Generation 2 systems
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CHAPTER 4 Interrogation Zone
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Time slice interrogator control is typically done with a back-end system controller that determines when each interrogator is allowed to communicate In this method, each interrogator is provided a set period of time for communication, and it is then turned off to wait for its next turn while all the other interrogators communicate Software synchronization allows the interrogators to communicate with one another and determine which one can transmit at what time via software built into the interrogator s operating system Hardware timing will usually employ the use of triggering devices to allow interrogators to communicate for controlled periods of time For instance, when an object breaks a light beam on the way into the IZ, the read cycle is started As the object leaves the IZ, it breaks another beam that tells the interrogator to stop
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Interrogators support various commands and functions used for managing the tag population They can address an entire group of tags to perform inventory of all tags in the area, as well as singulate each tag to access its memory and perform reading and writing operations The following are the most important interrogator commands:
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Select Used to determine which groups of tags will respond to further interrogation using the Inventory command (for example, this command can be used to isolate case tags from item tags) This command does not require any response from tags Inventory Used to identify individual tags within a group Access Used to communicate with individual tags and issue commands to them once they have been singulated Kill After the tag has been accessed and a secure communication channel established, this command can be used to make the tag stop functioning Killed tags will not respond to interrogation and cannot be resurrected Lock Used to secure the contents of a tag Once issued, it can prevent the tag from being read from or written to Can also be used to lock individual tag memory banks
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