Two events hastened the development of
SDH: the anti-trust law for the telecommunications sector in the USA and the definition of
B-ISDN.
The former was the catalyst for the development of SDH, while the latter provided the motivation
behind it. The SDH
hierarchy would allow for the implementation of
broadband
networks through a reference model that provided mechanisms not only for transporting
information, but also for the management and control of this transport. These networks
were to provide new circuits to the public communications networks and help them offer
new and advanced services while guaranteeing the quality of the communications.
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