Spread spectrum, which was employed back in the 1920s, evolved from military security applications. Spread spectrum uses a technique of organizing the radio frequency energy over a range of frequencies, rather than a fixed frequency modulation technique. The system uses frequency hopping with time division multiplexing. At one minute the transmitter is operating at one frequency, at the next instant it is on another. The receiver is synchronized to switch frequencies in the same pattern as the transmitter. This is effective in preventing detection (interception) and jamming. Thus, additional security is derived. These techniques should produce increased capacities in ten- to twenty-fold over existing analog systems.
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Copyright 2004 by Anne Bruce. Click Here for Terms of Use. code 39 generator open source
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Router(config)# key chain name_of_key_chain Router(config-keychain)# key key_number Router(config-keychain-key)# key-string key_value Router(config-keychain-key)# accept-lifetime start_time {infinite | end_time | duration seconds} Router(config-keychain-key)# send-lifetime start_time {infinite | end_time | duration seconds}
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