1.0/2.3 

DIN 1.0/2.3 series of RF connectors are available in 50 ohm and 75 ohm versions. These micro miniature connectors are designed to meet the standards IEC 61169-29, CECC 22230 & DIN 47297 and feature a push-pull coupling.  1.0/2.3 are widely used for digital telecommunications and due to their small size, our true 75 ohm versions are increasingly being used in broadcast, as an alternative to BNC.

For details; http://www.coax-connectors.com/products/connectors/1023-(din).aspx