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:
Sep. 30, 2003
Filed:
Oct. 26, 1999
Ralph R. Boudreaux, Jr., Madison, AL (US);
Adtran Inc., Huntsville, AL (US);
Abstract
During maintenance of telephony equipment the high voltage ring signals for POTS lines must be disconnected or disabled so as to remove the shock hazard potential associated with the substantially elevated ringing voltage present at a line card of a central office. This problem is effectively obviated by installing a three-terminal alarm fuse socket in a circuit path for the ringing generator, and wiring the socket's terminals to enable the fuse to operate as a switch. The switch is closed by inserting a (blown or unblown) three-pin alarm fuse. This enables a ringing voltage generated by the ringing voltage generator to be applied to the span and delivered to the ringing circuit of the handset. The switch is opened by removing the fuse. Ringing voltage functionality for and/or connectivity with the ringing voltage circuit is selectively dependent upon whether a fuse is installed in the receptacle, irrespective of the state of the fuse. Configuring the ring fuse socket to accommodate a three-pin alarm-indicating type fuse in such a non-standard 'switch' configuration allows the ring termination fuse to function as a 'spare' system alarm fuse that can be swapped out for another alarm fuse that has blown. The ringing fuse socket will continue to enable or disable the ringing voltage depending on the presence or absence of a ‘blown’ or ‘unblown’ fuse cartridge.