The Musa connector is a type of coaxial

Coaxial

In geometry, coaxial means that two or more forms share a common axis; it is the three-dimensional linear analogue of concentric.Coaxial cable, as a common example, has a wire conductor in the centre a circumferential outer conductor and an insulating medium called the dielectric separating...

 connector, originally developed for the manual switching of radar signals. It had a characteristic impedance

Characteristic impedance

The characteristic impedance or surge impedance of a uniform transmission line, usually written Z_0, is the ratio of the amplitudes of a single pair of voltage and current waves propagating along the line in the absence of reflections. The SI unit of characteristic impedance is the ohm...

 of 50 Ω, and was adopted for use in the emerging broadcast industry. By the time the first 'high definition' television first appeared in 1936, the connector was used as standard, unlike many popular types of coaxial connector it is engaged and disengaged by a straight push-pull action, making it ideal for patch bays.

Used in telecommunications and video

Video

Video is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.- History :...

, the connector has performed well but with the modern high definition signal now being broadcast, the mismatch between the original 50 Ω connector and the standard 75 Ω, used in almost every device in the broadcast industry, has become apparent.