T

- Intra-network Trunk Groups

• Inter-network Trunk Groups

- Intra-network Trunk Groups

• Inter-network Trunk Groups

Figure 1.1-6 Interconnection of fixed and mobile networks. MSG: mobile switching center.

tandem exchange T of a fixed (LATA) network. When a mobile station is making a call, it uses a radio channel of a nearby MSC.

Private Branch Exchanges (PBX) are exchanges owned by government agencies, businesses, etc., and located in buildings that belong to these organizations. A PBX enables the employees in a building to call each other, and to make and receive calls from subscribers served by the public network. A PBX is connected by an access line group (ALG) to a nearby local exchange (Fig. 1.1-7). An organization with PBXs in several cities can establish a private network

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