FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Properties of PSTN It is an aggregation of circuit-switched networks of the world. Originally, it was an entirely analog network laid with copper cables and switches. Presently, most part of PSTN networks is digitized and comprises of a wide variety communicating devices.

Detailed explanation-2: -An understanding of the workings of the Public Switched Telephone Network (PSTN) is best grasped by understanding its three major components: access, switching, and transport (see Figure 2-1). Each element has evolved over the 100-plus year history of the PSTN.

Detailed explanation-3: -PBX are two different types of voice switching systems. The PSTN is a telephone network that supports residential telephones, and the PBX is a switch system that supports business telephones. In addition, the scale of 64 kbps circuits used by the PSTN vs. PBX switch systems is different.

Detailed explanation-4: -It works by using underground copper wires that are hardwired from homes and businesses to switching centers-where the phone calls are connected to each other. The PSTN carries your voice calls from your telephone (whether that’s a landline or cell phone) through the network to the recipient’s phone.