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2. Time-slot interchange - Wikipedia

   en.wikipedia.org/wiki/Time-Slot_Interchange

   In a time-slot interchange (TSI) switch, two memory accesses are required for each connection (one to read and one to store). Let T be the time to access the memory. Therefore, for a connection, 2T time will be taken to access the memory. If there are n connections and t is the operation time for n lines, then t=2nT which gives n=t/2T

3. Stored program control - Wikipedia

   en.wikipedia.org/wiki/Stored_program_control

   SPC technology using analog switching matrices was largely phased out in the 1980s and had disappeared from most modern networks by the late 1990s. The addition of time-division multiplexing (TDM) decreased subsystem sizes and dramatically increased the capacity of the telephone network. By the 1980s, SPC technology dominated the ...

4. Telephone exchange - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange

   Traditional telephone switches connected physical circuits (e.g., wire pairs) while modern telephone switches use a combination of space-and time-division switching. In other words, each voice channel is represented by a time slot (say 1 or 2) on a physical wire pair (A or B). In order to connect two voice channels (say A1 and B2) together, the ...

5. Time-division multiplexing - Wikipedia

   en.wikipedia.org/wiki/Time-division_multiplexing

   Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time according to agreed rules, e.g. with each transmitter working in turn.

6. Time-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Time-division_multiple_access

   This is the case in both GSM and IS-136 for example. Exceptions to this include the DECT and Personal Handy-phone System (PHS) micro-cellular systems, UMTS-TDD UMTS variant, and China's TD-SCDMA, which use time-division duplexing, where different time slots are allocated for the base station and handsets on the same frequency.

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8. Spread spectrum - Wikipedia

   en.wikipedia.org/wiki/Spread_spectrum

   Spread spectrum of a modern switching power supply (heating up period) incl. waterfall diagram over a few minutes. Recorded with a NF-5030 EMC-Analyzer Spread-spectrum clock generation (SSCG) is used in some synchronous digital systems , especially those containing microprocessors, to reduce the spectral density of the electromagnetic ...

9. Space-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Space-division_multiple_access

   Space-division multiple access (SDMA) is a channel access method based on creating parallel spatial pipes (focused signal beams) using advanced antenna technology next to higher capacity pipes through spatial multiplexing and/or diversity, by which it is able to offer superior performance in radio multiple access communication systems (where multiple users may need to use the communication ...