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:
Jun. 27, 1989
Filed:
Jun. 29, 1988
Applicant:
Inventor:
Guenter E Hagedorn, Minnetonka, MN (US);
Assignee:
Nicollet Technologies, Inc., Eden Prairie, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
379 21 ; 379 26 ; 379 29 ;
Abstract
A hand-held telephone line signaling test instrument is described which provides test and timing measurment for telephone lines employing DID, DOD and POTS trunk lines. The hand-held instrument is capable of sourcing wink-start reverse battery protocol and DTMF, dial pulse or MF dial codes for testing a DID trunk. The device also incorporates a termination impedance and dial code receivers for DTMF, dial pulse and MF dialing codes. Analysis and comparison of the timing and measurements is performed by an internal microprocessor-based system with the results of the measurements displayed on an LCD alphanumeric display.