What is Crossover DB9 Null Modem Cable?

A crossover DB9 null modem cable is a specific type of cable used for serial communication between devices. It is commonly used to connect two devices that have RS-232 serial ports, such as computers, routers, switches, and other networking equipment. The crossover cable is designed to enable direct communication between these devices without the need for additional hardware or adapters.

the following is the old version desktop PC with desktop PC communication

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