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:
May. 30, 1989
Filed:
May. 19, 1987
Akira Arutaki, Tokyo, JP;
Hiromi Takahashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
For use in combination with an exchange which is coupled to a subscriber line used in transmitting a sequence of digital signals and comprises a time division switch unit coupled to the subscriber line and a control unit for controlling the time division switch unit to form an internal transmission path in the time division switch unit in response to the digital signals, a monitoring system comprises a command supply circuit for supplying a command to the control unit to form a monitoring path related to the internal transmission path in the time division switch unit. A coupling circuit couples to the subscriber line to a monitoring equipment through the monitoring path when the command is supplied from the command supply circuit to the control unit. The digital signal sequence is monitored by the monitoring equipment.