In a communication satellite, the telephone channels are assembled in

Explanation:

FDM is used by telephone systems to transmit multiple telephone calls through high capacity trunk lines, communications satellites to transmit multiple channels of data on uplink and downlink radio beams, and broadband DSL modems to transmit large amounts of computer data through twisted-pair telephone lines, among many other uses.

• Frequency-division multiplexing (FDM): Frequency division multiplexing (FDM) is a technique of multiplexing which means combining more than one signal over a shared medium.
• In FDM, signals of different frequencies are combined for concurrent transmission.
• In FDM, the total bandwidth is divided into a set of frequency bands that do not overlap. Each of these bands is a carrier of a different signal that is generated and modulated by one of the sending devices.
• The frequency bands are separated from one another by strips of unused frequencies called the guard bands, to prevent overlapping of signals.

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If an FDM system has a Bandwidth of f Mhz, and the Bandwidth of each signal transmitted by this system is fx Mhz then the total number (N) of the signals transmitted by the FDM system is given as:

\(N=\frac{f}{f_x} \)