| slovo | definícia |
plesiochronous
(foldoc) | plesiochronous
Nearly synchronised, a term describing a
communication system where transmitted signals have the same
nominal digital rate but are synchronised on different clocks.
According to ITU-T standards, corresponding signals are
plesiochronous if their significant instants occur at
nominally the same rate, with any variation in rate being
constrained within specified limits.
[Pronunciation? /ples'ee-oh-kroh'nus/?]
(1995-03-02)
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| | podobné slovo | definícia |
plesiochronous digital hierarchy
(foldoc) | Plesiochronous Digital Hierarchy
PDH
(PDH) A transmission system for voice
communication using plesiochronous synchronisation.
PDH is the conventional multiplexing technology for network
transmission systems. The transmitter adds dummy information
bits to allow multiple channels to be bit interleaved. The
receiver discards these bits once the signals have been
demultiplexed.
PDH combines multiple 2 Mb/s (E1) channels in Europe and
1.544 Mb/s (DS1) channels in the US and Japan.
PDH is being replaced by SONET and other SDH ({Synchronous
Digital Hierarchy}) schemes.
(2003-09-30)
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