Browse Prior Art Database

EMC/Retention Cap for High Speed Connectors

IP.com Disclosure Number: IPCOM000015397D
Original Publication Date: 2002-Feb-26
Included in the Prior Art Database: 2003-Jun-20
Document File: 6 page(s) / 302K

Publishing Venue

IBM

Abstract

Connectors that run at very high data rates contribute heavily to EMC problems in servers. This problem is amplified if it is an external connector due to the difficulty properly shielding the connector. This invention provides a way of greatly improving the EMC shielding of the scalability connector (Used in Vigil, Man of War, Crusader, Lookout, and Infiniband). Also, when a system is mounted into a rack enclosure on slides, the cables must be routed through a cable management arm so that the system pulled in and out of the rack without hanging the cables on the systems above and below. This motion causes a force on the connector which under certain circumstances has been proven to cause the electrical contact between the connector and board to fail. This invention will dramatically decrease the EMC emissions from the connector, while also providing the mechanical support necessary to properly support the connector. The combination of these things will improve the overall robustness of the connector design. In order to reduce EMC problems from a high speed external connector, great care must be taken in the design of the mechanical system that interfaces with the connector. This invention provides a means of ensuring proper contact with the EMC gasket on the connector to the chassis, ensuring connection of the EMC gasket to a ground plane of the card, and provides an EMC enclosure around the connector. This design is not limited to this connector, and can be incorporated (at the chassis level or the connector level) to any high speed connector where EMC problems are a concern. Also, in cases such as the scalability connector where a large stiff cable is restrained in a cable management arm (CMA), large forces can be transmitted from the cable to the connector. Without proper additional support to the connector, these forces will cause the connector's surface mounted leads to come detached from the solder pad. This invention solves both the EMC problems and provides additional support to the connector. 1 y

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Page 1 of 6

EMC/Retention Cap for High Speed Connectors

Connectors that run at very high data rates contribute heavily to EMC problems in servers. This problem is amplified if it is an external connector due to the difficulty properly shielding the connector. This invention provides a way of greatly improving the EMC shielding of the scalability connector (Used in Vigil, Man of War, Crusader, Lookout, and Infiniband). Also, when a system is mounted into a rack enclosure on slides, the cables must be routed through a cable management arm so that the system pulled in and out of the rack without hanging the cables on the systems above and below. This motion causes a force on the connector which under certain circumstances has been proven to cause the electrical contact between the connector and board to fail. This invention will dramatically decrease the EMC emissions from the connector, while also providing the mechanical support necessary to properly support the connector. The combination of these things will improve the overall robustness of the connector design.

In order to reduce EMC problems from a high speed external connector, great care must be taken in the design of the mechanical system that interfaces with the connector. This invention provides a means of ensuring proper contact with the EMC gasket on the connector to the chassis, ensuring connection of the EMC gasket to a ground plane of the card, and provides an EMC enclosure around the connector. This design is not limited to this connector, and can be incorporated (at the chassis level or the connector level) to any high speed connector where EMC problems are a concern. Also, in cases such as the scalability connector where a large stiff cable is restrained in a cable management arm (CMA), large forces can be transmitted from the cable to the connector. Without proper additional support to the connector, these forces will cause the connector's surface mounted leads to come detached from the solder pad. This invention solves both the EMC problems and provides additional support to the connector.

1

Page 2 of 6

y

z x

Connector Body

Connector Receptical

Figure 1. This shows the various parts of the connector.

Latch Plate Latch Plate

Solder Post

Latch Plate to Connector Plate Interface Point

2

[This page contains 8 pictures or other non-text objects]

Page 3 of 6

Y

Z

X

25 mm

a

c

Figure 2. This is the cable...