Patent Number: 6,250,936

Title: Single-port connection and circuitry accepting both balanced and unbalanced data signals

Abstract: A circuit and method for connecting data lines to a digital communication system are disclosed. The circuit allows either a balanced data line or an unbalanced data line to be connected to a single input port with no internal reconfiguration of the system. Connection to a balanced data line isolation transformer is provided at the port. A separate connection to ground is provided at the same port. A user connects the system to a balanced data line using a jack wired for connecting the balanced data line pair across the isolation transformer. A user connects the system to an unbalanced data line using a similar jack; however, the jack in this case is wired to short one transformer connection to the ground connection provided at the port, thereby unbalancing the transformer. In one embodiment, this second jack is part of a patch cable which accepts a coaxial connector on one end, appropriately wired to the shorted jack on the second end.

Inventors: Armistead; R. Ashby (Los Altos, CA), Metcalf; David W. (Santa Cruz, CA), Zheng; Danyang Raymond (Fremont, CA)

Assignee: Cisco Technology, Inc.

International Classification: H01R 13/00 (20060101); H01R 13/646 (20060101); H01R 31/00 (20060101); H01R 31/06 (20060101); H01R 013/652 ()

Expiration Date: 06/26/2018