An optical isolator is a passive magneto-optic device that makes travel of light unidirectionally. The operation of the device is based on the Faraday effect. It is used in applications to avoid unwanted feedback to the system using the optical isolator. Optical isolators are also known as optoisolators, optocouplers and photocouplers.
DB-25 is part of the D-subminiature (D-Sub) connector plug and socket family for computer and communication devices. DB-25 is a 25-pin electrical connector for serial and parallel computer ports. It is arranged in rows of two with one 13-pin row above another 12-pin row.
The DB-25 connector is used for parallel, small computer system interface (SCSI), or RS-232 serial applications. In parallel applications, DB-25 connectors are known as IEEE-1284 Type A connectors. The male DB-25 is the second-oldest serial computing port, referred to as COM2, and the standard 25-pin D-shell connector for EIA-232 serial communication. Various RS-232 communications devices use the male version. The female DB-25 is primarily used for computer printer ports. Older computers contain only one DB-25 female parallel port.
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