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The D-subminiature (D-Sub) connector style is one of the oldest and most common connector designs. It is often used for RS-232 type serial data connections and for other types of computer connections, such as patch cords or cable assemblies. D-sub connectors are characterized by their D-shaped metal shield, which is connected to the circuit board via a pin or screw, and a plastic shell which covers the pins, including both sides of the connector.

The dimensions of the D-subminiature connector series are generally divided into four levels: DB-25, DB-15, DB-9, and DB-005, although other sizes exist. DB-25 is the largest and is usually used for parallel connections, while DB-005 is the smallest and is typically used for high-speed data communications.

The D-sub backshell is designed to provide protection and strain relief for the termination site. It also allows the installation of additional connectors or cables to the outside of the backshell. The backshell consists of a metal housing with screw threads that match the D-sub connector, and a plastic outer shell that covers the pins. The housing is secured to the wire with a self-locking screw.

D-sub hoods are designed for protecting the contacts of the connector from damage, dust, and other contaminants. The basic part consists of two plastic shells, each covering half of the connector, and a metal frame that holds them together. Each shell has fingers that snap into the receptacle on the connector, providing a secure fit, and each has a grommet at the end of its mounting flange to eliminate strain on the cables.

D-sub connectors are designed to provide a reliable connection between two or more electrical devices. They are designed so that they can be connected in order to “daisy chain” serial devices. This type of connection requires less wiring and is easier to install. D-sub connectors are commonly used in networking equipment, computer systems, test and measurement systems, and audio/visual systems.

The working principle behind the D-sub connector is simple. The metal shield acts as a return path for any currents that might flow through the contacts, while the plastic shell covers the contacts and prevents any contaminants from entering the connector. The connection is completed when the contact pins on each side of the connector are mated to one another. An alternating current (AC) signal flow will cause a small voltage drop across the contacts due to the physical characteristics of the contacts and any dielectric materials present. This voltage drop has to be taken into account when specifying the signal strength for a connection.

The D-sub connector family can be used for a range of applications, including data transfer, power transmission, and signal routing. D-sub applications typically require high-speed operation with a low profile and reliability of operation in a wide range of environments. D-sub connectors are also often used in industrial and commercial applications, such as computer peripherals, office machines, point-of-sale equipment, communications devices, and medical equipment.

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