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Currently two types of spread spectrum technology exist: direct−sequence spread spectrum (DSSS) and frequency−hopping spread spectrum (FHSS). Because the signal does not stay in one place on the band, FHSS can elude radio interference. DSSS avoids interference by configuring the spreading function in the receiver to concentrate the desired signal and spread out and dilute any interfering signal. There is a lot of overhead involved with spread spectrum, and so most of the DSSS and FHSS systems historically have lower data rates than infrared− or microwave−based systems.

The maximum amount of time that a transmitter spends in a subchannel is called the dwell time. In order for FHSS to work correctly, both communicating ends must be synchronized (that is, both sides must use the same hopping pattern); otherwise they lose the data. FHSS is more resistant to interference because of its hopping nature. The FCC mandates that the band must be split into at least 75 subchannels and that no subchannel is occupied for more than 400 milliseconds. There is an ongoing debate about the security that this hopping feature provides.

Whenever data needs to be sent to the other department, the router acts as a network traffic controller and simply allows that data to pass through to the other network. 15: Router. Routers, therefore, simplify the network and greatly improve the network performance. Repeaters Wired LANs can cover a limited geographical area, which usually ranges from 150 to about 300 meters with most wired networks. The maximum range that a LAN can cover depends upon the equipment and the type of cable used. Repeaters are a simple solution to overcome and extend the geographic limit.

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