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. 26, 1992
Filed:
Mar. 04, 1991
Yukihiko Ogata, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A communication interface for the protocol of a layer 1 using an ISDN digital communication network, includes: a first communication controller to execute the communication control for a standard terminal; a second communication controller to execute the communications control for a network terminal device; and a switch between to switch the first and second communication controllers. The first communication controller executes the control as a layer 1 of the ISDN standard terminal. The second communication controller executed the control as a layer 1 of the network terminal device which is connected to the ISDN. The communication interface can execute the two-way connection test separately from the ISDN network and can be used in three modes of the ISDN layer 1 interface, TE layer 1 interface, and NT layer 1 interface.