Public circuit switched Network Long-distance Long-distance office office oo0oo End Office oo0oo oooooo End Office Subscriber Loop Connecting Trunk Intercity Trunk Connecting Trunk Subscribers. the devices that attach to the network Digital PBX Subscriber loop the link between the subscriber and the network Exchanges: the switching centers in the network End office: the switching center that directly supports subscribers Trunks: the branches between exchanges. They carry multiple voice-frequency circuits using either Fdm or synchronous TDM 88 Public Circuit Switched Network Subscribers: the devices that attach to the network. Subscriber loop: the link between the subscriber and the network. Exchanges: the switching centers in the network. End office: the switching center that directly supports subscribers. Trunks: the branches between exchanges. They carry multiple voice-frequency circuits using either FDM or synchronous TDM