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SONET and SDH protocols
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SONET and SDH protocols
Synchronous Optical Network and Synchronous Digital Hierarchy refers to standard
protocols which transfer multiple digital bit streams simultaneously in optical fibers through the
use of lasers or LEDs. In case of low data transmissions rates, the data can be transmitted
through an electrical interface. Both SONET and SDH were developed initially to aid in
transport circuit mode communications from various sources. They were originally designed to
offer support of real time, circuit-switched voice in PCM encoded format.
SONET differs from SDH in that it allows delivery of wide scope of protocols which
include ATM, ethernet, TCP/IP ...
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