Toshiba Phone System - Telephone System Image - ag Telephone System Hierarchy low res jpg

ag Telephone System Hierarchy low res jpg

Summary: connect end users telephones directly to other end users in a specific geographic area Higher level switches are used to interconnect lower level switches Public Switched Telephone Network PSTN Diagram Switches within the PSTN send control messages to each other usually through a separate control

Image Dimensions: 469 x 631

Image originally found here.

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