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

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50Fig. 21Information Model of PDH demultiplexerAll Managed Objects in the figure are of SINKtvoeFig. 22Information Model of PDH multiplexer64x2 Mbit/s signals transmitted via a 140 Mbit/ssignal and vice versaIManaged ObjectERICSSON REVIEW No. 1-2, 1992
51Fig. 23Inheritance hierarchy for PDH Termination PointsTTPCTPTrail Termination PointConnection Termination PointFig. 24PDH naming treeThe choice of transport Managed Objectsis illustrated in Fig. 21, which shows the InformationModel of a PDH 2/0.064 Mbit/sdemultiplexer. The figure is based on thereceive side of Fig. 11 and shows howManaged Objects and their possible locationsare derived from Transport Functions.The Resources in the vicinity of anend point of a Trail or a Connection can beassembled into a Managed Object. Thename of the Managed Object is related tothis end point.Fig. 22, which is based on Fig. 13, showsthe Information Model of a PDH 2/140Mbit/s multiplexer, multiplexing 64 separate2 Mbit/s signals into a 140 Mbit/s signaland vice versa. The multiplexer is connectedto adjacent equipment by means ofinterface cables.However, only those Managed Objectswhich are based on Resources are usablefor management. Table 3 lists Functions,Resources and Managed Objects relatedto the examples in Figs. 21 and 22. The tabletakes into account both transmissiondirections, whereas the figures are concernedwith only one direction.In PDH equipment, Resources normallyappear only in the receive side, leading to"SINK" type Managed Objects.The PDH Information Model can be usedto model, in a general way, all the differentkinds of PDH networks. This leads to theinheritance hierarchy shown in Fig. 23and to the Naming Tree shown in Fig. 24.The inheritance hierarchy consists of a genericpart and a PDH-specific part. EachERICSSON REVIEW No. 1-2, 1992
Page 1: ERICSSONREVIEW1-21992Frame Relay -
Page 4 and 5: ERICSSON REVIEWBO HEDFORSPublisher
Page 6 and 7: 4Fig. 2Distributed computer environ
Page 8 and 9: Fig. 7A company's data network shou
Page 10 and 11: 8Fig. 11The frame format used for F
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Page 16 and 17: Box 1Code39, the first alphanumeric
Page 18 and 19: 16Fig. 6Cable attenuation test at E
Page 20 and 21: 18Fig. 9Installing the Dehlfi syste
Page 22 and 23: Human Factors - A Key to ImprovedQu
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Page 26 and 27: 24Fig. 5Advanced Human Factors desi
Page 28 and 29: Fig. 7User interface for PBX attend
Page 30 and 31: Cell-voltage EqualisersSeries BMP 1
Page 32 and 33: 30Box1CELL-VOLTAGE EQUALISER BMP 16
Page 34 and 35: 32age, the faulty cell or the entir
Page 36 and 37: In Search of Managed ObjectsWalter
Page 38 and 39: Fig. 4The telecommunication network
Page 40 and 41: Fig. 6Functional Model illustrating
Page 42 and 43: 40Fig. 9Combination of layering and
Page 44 and 45: 42Table 2Relationship between Funct
Page 46 and 47: 44No1PPI2PPI3SLTTransport Function(
Page 48 and 49: 46Table 4SDH functions, Resources a
Page 50 and 51: The Managed Objects and their prope
Page 54 and 55: Fig. 25Information Model of SDH mul
Page 56 and 57: 54Table 5Cross-connect functions, R
Page 58: Fig. 32, leftCross-connect Fragment

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