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This Concept Map, created with IHMC CmapTools, has information related to: chp6, modems how are they connected Leased analog Data circuits, modems Carrier frequenices and multiplexing In summary: Frequency division multiplexing allows multiple pairs of senders and receivers to communicate over a shared meduim simultaneously. The carrier used by each pair operates at a unique frequency that does not interfere with the others, Computer networks that use a modulated carrier wave to transmit data are similar to television stations that use a modulated carrier wave to broadcast video. important principle two or more signals that use different carrier frequencies can be transmitted over a single medium simultaneously without interference., modems which is a Demodulator-a hardware circuit that accepts a modulated carrier wave and recreates the sequence of data bits, modems Carrier frequenices and multiplexing engineers have used to bulid a variety of network technologies that permit independent communications to proceed simultaneously over a single underlying meduim., modems Carrier frequenices and multiplexing Computer networks that use a modulated carrier wave to transmit data are similar to television stations that use a modulated carrier wave to broadcast video., modems Carrier frequenices and multiplexing time division multiplexing(TDM),which is a alternative to FDM, modems which is a modulator-a hardware circuit that accepts a sequence of data bits and applies modulation to a carrier wave according to the bits, Leased analog Data circuits ???? Many companies use one or more 4-wire circuits as part of their data communication network.Telephone companies allow companies to lease a circuit between any two locations., modems Carrier frequenices and multiplexing technically known as wavelength division multiplexing, an electric current cannot be propagated an arbitrary distance over copper wire because the current becomes weaker as it travels which causes signal loss:such loss occurs because resistance in the wire causes small amount of the electrical energy to be converted to heat., Synchronous time Division Multiplexing(STDM) which ???? Statistical Multiplexing, Long-Distance Communication some hardware modems, Synchronous time Division Multiplexing(STDM) which ???? Sychronous Time Division Multiplexing(STDM), time division multiplexing(TDM),which is a alternative to FDM Two types of TDM Synchronous time Division Multiplexing(STDM) which, modems are also used with RF transmissions, glass fibers, and conventional telephone connections., Long-Distance Communication 6.2 Sending signals across long distances an electric current cannot be propagated an arbitrary distance over copper wire because the current becomes weaker as it travels