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Selectively Plated Serpent Block Connector

IP.com Disclosure Number: IPCOM000081668D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Cefarelli, FP: AUTHOR [+3]

Abstract

The coaxial cables utilized between units in digital data processing equipment tend to pick up signals on the outer conductor of the cable. Accordingly, in the past the outer shield of the coaxial cable has had a separate connection in the connector which ultimately leads to ground. This grounding of the coaxial shield prevents the noise signals picked up thereon from entering the machine in which the cable is connected. This arrangement required a connection from each contact in the connector to ground, or a connection from the ground contact to ground contact, and ultimately a connection from the last contact to ground.

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Selectively Plated Serpent Block Connector

The coaxial cables utilized between units in digital data processing equipment tend to pick up signals on the outer conductor of the cable. Accordingly, in the past the outer shield of the coaxial cable has had a separate connection in the connector which ultimately leads to ground. This grounding of the coaxial shield prevents the noise signals picked up thereon from entering the machine in which the cable is connected. This arrangement required a connection from each contact in the connector to ground, or a connection from the ground contact to ground contact, and ultimately a connection from the last contact to ground.

These multitude of wire connections to ground have been eliminated by selectively plating the terminal block 10 by the deposition of a conductive metallic coating 12, which serves as a common ground to the machine frame for each of the outer shields of the coaxial cables.

The method consists of first masking the openings in the terminal block, which are to carry the signal from the center conductor of the coaxial cable. This is accomplished by developing a small molded rubber masking unit 14 having molded rubber plugs 16 which are indexed with the appropriate openings, so that the plugs fit into the appropriate openings to provide the masking. These plugs 16 mask the appropriate holes and the surrounding shoulder area from plating.

The terminal block 10 is then covered with a lacquer bonding layer to pr...