D-Sub dual ports are a type of connector that is made up of two female d-sub connectors normally found on a single housing. They are commonly used in the networking, computer and telecommunications applications. These connectors are used to connect two devices together such as modems, computers, switches and routers. Dual port connectors are sometimes referred to as DB9 connectors. The most common uses for dual port connectors are in the communication fields such as Ethernet networks. Some of the advantages of using dual port connectors include their flexibility, convenience, and reliable connection.