On physical structure, the implementation of TMN can inspect particular case and differ, the physical equipment of each TMN is corresponding have a certain number of functions piece can offer an alternative. But interrelate to implement the system of much manufacturer, much equipment, TMN suggested to set standard interface and consultative information pattern, the standardization of interface also is the key that introduces TMN idea.

SDH government net (SMN) the subclass that can regard the TMN that is unit of administrative SDH network, SMN can differentiate further for a certain number of management child net (SMS) , each management child the person that the net is equivalent to operation of a network administer the one part of whole SDH network inside limits, for example some kind all SDH equipment of manufacturer and corresponding ECC link. The constituent model that SDH net canal introduced decentralized management likewise and be based on controller / the communication mechanism of succedaneum, most lower level is the SDH network unit that provides deferent service, the quits substance in as unit as other network, MD or OS is alternant, the interior in same arrangement and the message construction demand that define between the layer up and down keep consistent.

SDH uses lump frame structure, the rich network that can provide provides expense bit, the access of standard DCC data that defines in SOH (D1~D12) the management that is SDH net and control provided powerful communication infrastructure, can manage the network link of functional by ECC to download intelligent network unit quickly thereby, realize distributed managing truly.

On consultative description, the used OSI government generally general principle in SDH network management, through ECC agreement inn corresponds between SDH network unit, DCC channel is used on physical layer, q interface is passed between the SMS of SDH and TMN (include Qx and Q3) alternant government information, according to ITU-T proposal Q.811 and Q.812, the consultative warehouse kind that can offer an alternative is CONS1 / CLNS1 / CLNS2[3][4] .

ITU-T proposal Q.774 (92) be aimed at formulate of the physics with SDH peculiar net and logistic resource abecedarian information model (NE part) , waited for a part to undertake edit and complementing to monitoring of property management, passageway in succession again subsequently, more perfect version was formed 1994. This is transverse to product of much manufacturer SDH compatible have conclusive effect, also build SDH network layer to managed a system to lay very good foundation for our country proper motion.



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