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Issue the current situation of generation SDH and development trend analysis
From;    Author:Stand originally
Summary: The article described the fixed position of next generation SDH and development course above all, introduced the core technology that next generation SDH place use next, brief finally elaborated a few viewpoints that are aimed at prospective intelligence optical network.

Keyword: MAN of net of city land with certain boundaries; SDH of synchronous number series; Much professional work is deferent platform MSTP; Stretch in group annulus RPR; Smooth cent is inserted answer with implement OADM; OXC of smooth across connector; OTN of optical deferent network; Exchange deferent net ASTN automatically

(one) the fixed position of next generation SDH and development course

The generation of next generation SDH and in recent years net of arisen city land with certain boundaries is built closely related, review once upon a time, home does not have net of city land with certain boundaries almost (MAN) concept, because business of one's voice in speech is main body, and this locality net is an everybody's familiar word, this locality net divides net of the word that it is city, suburb net to still have farming word net again. Data business development is rapidder now, although still be put in many obstacles and problem in operation process, but the trend is Anacreontic. Now, each big operation business offers home in succession net of respective city land with certain boundaries builds a plan, and begin like a raging fire, investigate its essence reason, it is to realize a network to optimize, receive in long-distance backbone net and user namely appearance of “ fault ” is eliminated between the net. Because network of city land with certain boundaries will be distributed to be nodded in different ground (village of enterprise, mechanism, intelligence, commercial building, guesthouse, school is waited a moment) the conformity that user business has the oldest rate, comb, after gathering together, send toward backbone layer again, make network administrative levels becomes very clear thereby, efficiency also gets great promotion. Of course, net of city land with certain boundaries is in-house but fractionize is core, gather together and receive a layer, should wait for actual condition according to size of network dimensions of the city, capacity specific undertake planning, cannot one knife of “ cuts ” .

From city land with certain boundaries the relation of deferent net and net of business of city land with certain boundaries looks, if SDH is deferent,the net just fulfils the transparent and deferent function of pair of business signal, do not have dynamic bandwidth to allocate ability and certain intelligent sex namely, so, the pressure of business layer oneself is very enormous. This, business of old brand operation experiences special profundity, before data equipment basically is relied on fiber-optic link fashion group network continuously, deferent equipment is willing to help but unable to do so. Now, business of old brand operation is amending their train of thought that build a network, burgeoning operation business gets lost to be received in city land with certain boundaries and gather together the layer uses much professional work directly deferent facilities will partake the pressure of business layer, and going up somehow, can reduce installation cost and the sexual price that raise a network to compare.
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