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Introduction to Public Switched Telephone Networks - PSTN

Introduction to Private Branch Exchange - PBX Book

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   Public Switched Telephone Network - PSTN

Public switched telephone networks are communication systems that are available to the public to allow users to interconnect communication devices. Public telephone networks within countries and regions are standard integrated systems of transmission and switching facilities, signaling processors, and associated operations support systems that allow communication devices to communicate with each other when they operate.

This figure shows a basic overview of the Public Switched Telephone Network (PSTN) as deployed in a typical metropolitan area. PSTN customers connect to the end-office (EO) for telecommunications services. The EO processes the customer service request locally or passes it off to the appropriate end or tandem office. As Different levels of switches interconnect the parts of the PSTN system, lower-level switches are used to 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-signaling network called signaling system number 7 (SS7). The SS7 network is composed of signaling transfer points (STPs) and service control point (SCP) databases. A STP is used to route packets of control messages through the network. SCP's are databases that are used by the network to process or reroute calls through the network (such as 800 number toll free call routing). SS7 also provides for the newer features such as incoming call identification and automatic call rerouting used by some service companies that provide 24/7, worldwide dial-in support.

   Public Switched Telephone Network - PSTN Terms

Interconnection Types
Switching

   Public Switched Telephone Network - PSTN Books

Introduction to Private Branch Exchange - PBX Book

more details

Introduction to Public Switched Telephone Networks - PSTN

This book describes public telephone technology and systems including local loop, digital loop, switches, multi-channel communication lines and signaling control systems. Discover the types of DSL including ADSL, ADSL2, HDSL, SDSL, and VDSL and how DSL can offer television services with thousands of channels.

$14.99 Printed, $11.99 eBook

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