Abstract: An analog coupling device for coupling a telephone to a telephone network circuit while maintaining isolation of the two circuits has an optical emitting element and an optical receiving element in the network circuit. The telephone circuit includes an optical receiving element optically coupled with the network circuit optical emitting element. The telephone circuit optical receiving element has a reversed biased pn junction. The telephone circuit further includes an optical emitting element which is optically coupled with the network optical receiving element.

Abstract: A connector interface for enabling multiple conversions between first and second data handling systems wherein the data in the first system is arranged in a first type of format and the data in the second system is arranged in a second type of format, includes a connector housing with first and second sets of electrical contact elements exposed at different portions of the housing. Circuitry contained entirely within the housing operates to convert data transmitted to the first set of contact elements from the first data handling system into corresponding data in the second type of format for transmission to the second data handling system through the second set of contact elements, and to convert data transmitted to the second set of contact elements from the second data handling system into corresponding data in the first format for transmission to the first data handling system.

Abstract: A connector interface for enabling communications between first and second data handling systems wherein the data in the first system is arranged in a first type of format and the data in the second system is arranged in a second type of format, includes a connector housing with first and second sets of electrical contact elements exposed at different portions of the housing. Circuitry contained entirely within the housing operates to convert data transmitted to the first set of contact elements from the first data handling system into corresponding data in the second type of format for transmission to the second data handling system through the second set of contact elements, and to convert data transmitted to the second set of contact elements from the second data handling system into corresponding data in the first format for transmission to the first data handling system.