A transmission equipment is a communication line that connects a switch to a switch. The transmission system and technology includes: PDH(Pseudo-synchronous Digital Hierarchy), SDH(Synchronous Digital Hierarchy), MSTP(Multi-Service Transfer Platform), ASON(Automatically Switched Optical Network), PTN(Packet Transport Network), DWDM(Dense Wavelength Division Multiplexing), OTN(Optical Transport Network), PON(Passive Optical Network) and so on.
The fundamental of transmission includes:
PDH to SDH, added ring network protection and subnet protection,
SDH to MSTP, Converged TDM and Ethernet layer switching,
MSTP to ASON/NG-SDH, realize Mesh network structure,
MSTP to PTN, complete grouping of switched kernels and so on.
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