Bidirectional line driver
Bidirectional repeater in data transmission system
Communications network repeater
Electronic relay arrangement
Error control for digital multipoint circuits
Multidirectional repeater
PCM regenerator
Phase locked loop NRZ data repeater
Regenerator having automatic gain control referenced to a data-p
Selection of branch lines of multipoint junction circuits
Self-contained bidirectional amplifying repeater
Signaling unit for interchange of data with multipoint line sele
Supervisory systems for telecommunication line transmission syst