LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip circuit for stopping call signal at different...

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip circuit for subscriber telephone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ring trip circuit having a simple trip detecting circuit of a hi

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip deciding circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip detection circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip detection circuit and method for subscriber line...

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip detection in a communication system

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip detection in telecommunications exchanges

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring trip detector

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ring varying technique for a telephone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ring-tone identification of urgent phone calls

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ring-tone identification of urgent phone calls

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ring-tone muting device and processing method

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ring-trip circuit

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Ringback detection circuit

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ringer assembly

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ringer circuit

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ringer circuit

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Ringer circuit for generating sine wave