what is a common interface slot ?

Common Interface on TV common interface slot Connecting the “CI or CI+ Card” Connect the “CI or CI+ Card” to the COMMON INTERFACE slot as shown in the image below Connecting the “CI or CI+ Card” via common interface slot airtel The Keysight E7770A common interface unit provides a bidirectional intermediate frequency interface to the device under test by up- or

common interface slot interface for the CA module—any module that complies with the DVB-CI specification will work in any receiver equipped with a DVB-CI slot common CASs on