In TSSST switch (where SSS stands for a three-stage space-division switch) with N=150.  It is used 15 time division switches in the first stage and 15 time division switches in the fifth stage. We use 3 crossbar switches in the second stage, 2 crossbars at the third stage, and 3 crossbars at the fourth stage. What is the total number of crosspoints?

Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.