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Multiplexing is the reversible operation of combining several information-bearing signals to form a single, more complex signal The signals that are combined in a multiplexer usually come from independent sources, such as subscribers in a telephone network Prior to multiplexing, each signal travels over a separate electrical path, such as a pair of wires or a cable, whereas the multiplexed signal can be transmitted over a single communication medium of sufficient capacity The reversibility of the multiplexing operation permits recovery of the original signals which often have different final destinations at the receiving end of the transmission link This inverse operation whereby the original signals are recovered is called demultiplexing Multiple access may be considered as a special kind of multiplexing in which two or more signals, each from a different location, are sent by radio to a single transponder.

>>> a,b=-8,13 >>> cmp(a,b) -1 >>> hex(34) 0x22 >>> cmp(0x22,34) 0

SIP client to Registrar REGISTER sip:registrar.here.com SIP/2.0 Via: SIP/2.0/UDP 4.3.2.1:5060;branch=z9hG4bK87ds To: User A <sip:usera@here.com> From: User A <sip:usera@here.com>;tag=34323kl12d Call-ID: a532431277gfhd43gsfg3awrsad Max-Forwards: 70 CSeq: 16 REGISTER Contact: sip:usera@4.3.2.1;class=personal Contact: tel:+1-314-555-1212 Contact: mailto:usera@here.com Content-Length: 0

The term "multiplexing", however, is usually restricted to describe those other situations where the signals to be combined arrive over electrical circuits The most commonly used techniques for both analogue multiplexing and multiple access are based on the common principles of frequency division In a frequency division multiplex (FDM) system, a number of channels are arranged side by side in the baseband, and thus can be accommodated by a single wide bandwidth transmission system The actual multiplexing process is as follows (Figure 313): a) each telephony channel transmits audio frequencies from 03 to 3.

=25000*(1+.08)/.08

4 kHz, the baseband signals being in the form of single-sideband (SSB) signals with suppressed carriers at 4 kHz spacing; b) twelve telephone channels are frequency-converted to compose a basic group in the frequency range from 60 to 108 kHz; c) five basic groups are again frequency-converted to compose a basic supergroup in the frequency range from 312 to 552 kHz; d) frequency-conversion of this basic supergroup can be realized to multiplex many further telephone channels FDM is used for terrestrial communications, and conventionally the multiplexed telephone channels are arranged at baseband frequencies above 60 kHz However, in satellite communications, one basic group is arranged in the frequency band of 12 to 60 kHz so as to use the baseband frequency bandwidth more effectively At the receiving earth station, the FDM signal is demultiplexed through a sequence of filtering and SSB-demodulation steps.

Digital transmissions take advantage of another technique, called time-division multiplexing, in which the bit streams arriving in parallel at a network node (for example a satellite communications terminal or an intermediate switching centre) and having the same destination are time-division multiplexed (i.e. interleaved) into a single serial bit stream for transmission on a single RF carrier. As in an FDM system, a TDM signal is formed through a sequence of multiplexing steps. The resulting multiplex arrangement is called a hierarchy.

Separation of supergroups, and individual channels by filters is possible with minimal impairment because of guardbands left in the FDM signal It should be recalled that the voice signal occupies only 3 100 Hz of the 4 kHz channel An important technical requirement of FDM concerns the accuracy and coherence of SSB carrier frequencies, which are usually derived from stable master oscillators..

with nk = Keplerian mean motion of the satellite = 2 /orbital period (rad/s). Another useful relationship is expressing the conservation of the total energy and allows the calculation of the satellite absolute velocity V all along its trajectory: V = (2/r 1/a)

14.7 The bridesmaid holds her owers while the bride gets ready for the wedding. Exposure: ISO 400, f/3.5, 1/100 second.