LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling,Using line or loop condition detection

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

Telephone trunk interface circuit

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

Telephony distribution system

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

Test method for line equipment including a hybrid circuit...

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

Three relay C. O. trunk interface

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

Tone based answer detection for IP based telephones

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

Transient signal elimination circuit for telecommunications appl

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

Transient signal elimination circuit for telecommunications appl

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

Two way telephone communication system

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

Two-way voice communication methods and apparatus

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

Two-wire telecommunications line detection arrangements

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

Two-wire telecommunications line detection arrangements