第1个回答 2011-05-03
Within the coming information socitey, people hope morden information transmit network can offer all kinds of circuit and business quickly,economically and effectively, because of monotony , complexity extend and bandwidth limitations, e the orginal internet technique only amended in the the old frame this become more and more useless, meanwile, SDH get enormous development depends on multitudinous characteristic in Wide Area Information field and Secial Area information field. SDH frame arranged richful spending byte for internet operaton, management and maintenance. All in all, these spending bytes mainly include two sorts: SOH and POH. SOH can be devided into RSOH and MSOH. POH can be further devided into HPOH and LPOH this mostly applied for the management and maintenance for the faultage and channels .
第2个回答 2011-05-03
With the approaching of imformation society,people anticipate that the modern information transmission can provide various kinds of electric circuit and services quickly, economically and effectively,while the original net techology,which only to modified or improvement within its primal framework ,has become no avail due to its monotony of its work,complexity of its expanding,and the limitation of its bandwidth.Meanwhile,the produce of SDH has achieved great development in in the WAN fields and Private network areas on account of its multitudinous features.SDH(Synchronous Digital Hierarchy) arrange the ample overhead byte to operation, management and maintenance in its frame structure.Generally speaking,these overhead byte can be classified in two sorts,includes section overhead(SOH) and Path Overhead (POH). SOH can divide into Regenerator Section Overhead (RSOH) and Multiplex Section OverHead (MSOH), Path overhead can also be further divided into higher order path overhead and lower order path overhead,which are respectively applied for the management and maintenance of faults and path Layer.
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第3个回答 2011-05-03
With the coming of information society, people want to modern information transmission network can quickly, economically and effectively provide various circuit and business, and the original network technology because its business monotonicity and spread, the bandwidth limitations, the complexity in original only within the framework already useless, modify or perfect at the produce and relies on its SDH many characteristics of its wan fields and private network areas to be a huge development. SDH (Digital Synchronous Hierarchy) frame structure arranged for the rich for network overhead bytes of operation, management and maintenance. Generally speaking, these spending bytes mainly includes SOH) and overhead (section POH) two channels of overhead (. Section spending can divide again RSOH renewable section spending (and reuse section MSOH) overhead (. Channel costs can also be further divided into higher-order channel spending and low order channel expenses, respectively applied for the faults and channel layers of management and maintenance.
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第4个回答 2011-05-04
With the information society, people want to modern information transport network can quickly and economic and effectively with various circuits, and business, and the network technology because of its business of the tonal, extension of the complexity of the existing limitations, only in the revised or improved have won, by and by its sdh has many characteristics, on the wan area and the net area has developed greatly. sdh (synchronous digital hierarchy) frame structures