Frame Relay - for Faster and More Efficient Data Communications ...

Fig. 25Information Model of SDH multiplexer63x2 Mbit s signals are transmitted via a 155Mbit s signalManaged ObjectAdaptation FunctionTrail Termination FunctionSub-Network Connection Functionof the managed TPs may be eitherSOURCE, SINK or BIDIRECTIONAL.SDH Information ModelThe SDH Information Model is based onthe Functional Model already presented.Fig. 15 shows the SDH multiplexing structurewith Transport Functions and relatedsignals. Fig. 25 exemplifies the derivationof Managed Objects related to the multiplexingof 63x2 Mbit/s signals into an STM-1 signal. Fig. 26 shows a correspondingexample of an SDH Regenerator. Table 4lists functions, Resources and those ManagedObjects which are based on Resourcesfor the send and receive parts involvedin multiplexing and demultiplexing.SDH multiplexers offer - in addition to themultiplexing function - cross-connectfunctions, which are treated in detail in thenext chapter. (See also Table 5.) The comparisonof SDH and PDH multiplexers clearlyshows the increased management capabilitiesof the SDH concept.The SDH Information Model can be usedto represent, in a general way, all the differentkinds of SDH networks. The correspondinginheritance hierarchy is shown inFig. 27 and the naming tree in Fig. 28.As a general principle, the containment relationshipbetween TTPs and CTPs (TTPcontains CTP) is used for naming. The associationsbetween CTPs and TTPs areeither fixed links represented by Connec-MultiplexerSection LayerFig. 26Information Model of SDH regeneratorERICSSON REVIEW No. 1-2, 1992