Introduction to Telephony Systems

Front

What is switching?

Back

Switching is defined as transferring data packets from the source to the destination by sending them from one port to another.

Front

What are the two methods to move data through a network of links and switches?

Back

The two methods are packet switching and circuit switching.

Front

What is circuit switching?

Back

Circuit switching is a type of network configuration where a physical path is dedicated to a single connection between two endpoints for the duration of the call.

Front

What are examples of where circuit switching is used?

Back

Examples include traditional telephone systems (landlines) and optical circuit switching in data centers.

Front

What are the three main phases of circuit switching?

Back

1. Connection establishment 2. Data transfer 3. Connection relinquishment.

Front

What is Time Division Multiplexing (TDM)?

Back

TDM is a method of transmitting independent signals over a common signal path by synchronized switches.

Front

What is Frequency Division Multiplexing (FDM)?

Back

FDM divides multiple data signals into multiple bands for simultaneous transmission.

Front

What is the main advantage of circuit switching?

Back

A committed transmission channel is established, providing a guaranteed data rate.

Front

What is a disadvantage of circuit switching?

Back

It takes a long time to establish a connection and requires more bandwidth.

Front

What is PSTN?

Back

PSTN stands for Public Switched Telephone Network, the traditional circuit-switched telephone network.