Benefits of SDH Transmission
SDH transmission systems have many benefits over PDH:
Software Control allows extensive use of intelligent network management software for high flexibility, fast and easy re-configurability, and efficient network management.
Survivability. With SDH, ring networks become practicable and their use enables automatic reconfiguration and traffic rerouting when a link is damaged. End-to-end monitoring will allow full management and maintenance of the whole network.
Efficient drop and insert. SDH allows simple and efficient cross-connect without full hierarchical multiplexing or de-multiplexing. A single E1 2.048Mbit/s tail can be dropped or inserted with relative ease even on Gbit/s links.
Standardisation enables the interconnection of equipment from different suppliers through support of common digital and optical standards and interfaces.
Robustness and resilience of installed networks is increased.
Equipment size and operating costs are reduced by removing the need for banks of multiplexers and de-multiplexers. Follow-on maintenance costs are also reduced.
Backwards compatibly will enable SDH links to support PDH traffic.
Future proof. SDH forms the basis, in partnership with ATM (asynchronous transfer mode), of broad-band transmission, otherwise known as B-ISDN or the precursor of this service i
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