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608 MOBILE APPLICATION PART19.6.2 Equipment EntitiesThe equipment entities in a PLMN that are involved in GSM-MAP transactions areshown in Fig. 19.6-1 [6].Mobile Switching Centers (MSC). In this example, the PLMN has two MSCs,each of which serves the mobiles in its service area.Home Location Register (HLR). This register stores semipermanent and temporarydata about the mobiles for which PLMN is the home network.Visitor Location Register (VLR). The register has records on the mobiles thatare currently being served by its associated MSCs. In this example, VLR-P andVLR-Q are associated with MSC-A and MSC-B, respectively.Figure 19.6-1. Equipment entities and interfaces. (From GSM.09.02-Version 4.9.0. Courtesy ofETSI.)

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