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

55Fig. 30Group Termination Point cross connection- To/from TP pointers, which are relationshipattributes belonging to the XC ManagedObject and pointing at the CTPs (orGTPs)-Connectivity pointers, which are relationshipattributes belonging to the CTPsand indicating which CTP is connectedto which CTP.In the example, four instances of this Objectclass represent the four point-to-pointcross connections. Three of the four to/-from TP pointers correspond to the threeactivated cross connections. In the fourth- only assigned - cross connection, theConnectivity pointers will be NULL to indicatea non-activated state.Fig. 30 shows cross connections betweendifferent groups of Termination/ConnectionPoints. In addition to the point-to-pointcase, the Information Model consists of:- A Group Termination Point ManagedObject class (GTP) which represents agroup of CTPs to be cross-connected asa single unit- A Cross Connection object pointer,which is a relationship attribute belongingto the GTP and pointing at the XCManaged Object- A "naming", which is a relationship attributebelonging to the GTP and pointing atthe CTPs that constitute the GTP.In the example, the three cross-connect-Fig. 31Broadcast cross connectionERICSSON REVIEW No. 1-2, 1992