The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1980
Filed:
Dec. 29, 1978
Barry S Bosik, Parsippany, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A subscriber loop carrier system is disclosed for frequency multiplexing a plurality of subscriber channels on a single twisted metallic pair using frequency division techniques. Supervisory signaling is accomplished from the central office to a remote location by imposing a signaling tone of the carrier frequency for each signal. Supervision from the remote terminal to the central office is accomplished by interrupting the carrier signal itself. Ringing signals are supplied by interrupting the tone signal at a 20 Hz rate. Testing the subscriber channel is accomplished by leaving the tone on for a period in excess of the period used for ringing. Each channel of the carrier system can, therefore, be independently tested by using the uninterrupted tone to gate the remote carrier on for transmission back to the central office terminal. When detected, this carrier signal from the remote terminal indicates a complete communication path from the central office to the remote terminal and back again, i.e., channel continuity.