High speed automatic test apparatus especially for electronic di
High speed digital data transmission over switched voice network
High speed modem
High voltage detection circuit, bell signal detection circuit an
High voltage message waiting circuit
High-density cross-connect bay
High-density telecommunication drawer assembly
High-efficiency line driver
High-frequency noise elimination for use in telephone systems
High-speed data communication over a residential telephone...
High-speed data communication over a residential telephone...
High-voltage protection circuitry in a data access arrangement
Highly recyclable keypad with a key top and method of...
Highway expansion apparatus for key telephone system and...
Hinge apparatus for a foldable telephone
Hinge apparatus for a portable terminal and portable...
Hinge apparatus for flip style portable phone
Hinge apparatus having a self-latching hinge shaft for foldable
Hinge device
Hinge device