Patent Application
20170288354
This disclosure relates to the field of backplane connectors, more specifically to backplane connectors suitable for use in a mid-plane configuration.
As is known, servers and other high performance systems often desire to increase the density of processors. One issue that limits the ability to pack more processing power in a particular box is real estate on the circuit board. Even with 14 nm sized transistors there is a limit to the number of processor cores that can be mounted on a given circuit board configuration. Servers and other high performance computers therefore often use a system that combines a main board with multiple secondary boards to increase the amount of processing power that can be fit within a single box. The secondary boards are often called daughter cards and allow for three-dimensional architecture.
As the systems have become more complicated the system architecture has increased in complexity and now mid-plane designs are common. The mid-plane design essentially places a circuit board between two other circuit boards and thus provides a way to manage all the connections and ensure one processor can communicate with multiple daughter cards (or so that one daughter card can communicate with multiple processors.). Essentially this creates a system where three circuit boards are positioned in a box in a desired configuration and the mid-plane board communicates between two circuit boards.
One issue with existing mid-plane designs is that they have two fixed planes for the connector mating face. As the box is configured to support different circuit boards that are secured into position in the box, the tolerances of positions of the various circuit boards can be difficult to manage.
Due to the need to reduce loss caused by the mid-plane circuit board, certain individuals have taken to using cable-based trays as a substitute for circuit boards. Existing cable tray designs do not allow for the cable tray to absorb positional tolerances (beyond a minor level inherent in the connector) and thus, especially where the mid-plane is used to provide connection between two racks, the mid-plane requires precise control over the endpoint position. Certain individuals would therefore appreciate improvements in the mid-plane tray design.
A cable tray assembly is provided with a first shell with a first face and a second shell with a second face, where one of the shells is partially inserted into the other shell so that the first face and second face are on opposite sides of the cable tray assembly. The cable tray assembly includes an adjustment system that can absorb variances in the positions of the first face and the second by precise screw adjustment or telescopic shaft that can optionally including a biasing member. The adjustment system allows the cable tray assembly to be inserted in between the two racks and then expanded until both the first and second faces are position so that connectors supported by the cable tray assembly can mate with connectors supported by a chassis. Adjustability also enables a single cable tray assembly to meet multiple mating face to mating face dimensions or wipe length requirements.
The present application is illustrated by way of example and not limited in the accompanying figures in which like reference numerals indicate similar elements and in which:
The detailed description that follows describes exemplary embodiments and is not intended to be limited to the expressly disclosed combination(s). Therefore, unless otherwise noted, features disclosed herein may be combined together to form additional combinations that were not otherwise shown for purposes of brevity.
As can be appreciated from
As can be appreciated, the shell 50 includes a plurality of sides 52 that define an interior cavity 58 and the shell 80 includes a plurality of sides 82 that define an interior cavity 88. Connectors 75 are mounted on the face 60 and connectors 95 are mounted on the face 90. In one embodiment the connectors on both faces 60, 90 can be the same but in other embodiments the connectors on each face can very. In addition, the connectors on one of the faces can also vary as desired to as to provide a flexible CTA 10. The depicted connectors 75 include an alignment peg 77 and an array of signal terminals 79 and the connectors 95 can be configured in the same manner.
The depicted shell 50 has an expanded portion 55 that is configured to accept the shell 80. It has been determined that such a configuration makes it easier to manage the cable routing. Alternative configurations where is no expanded section because it is larger would also be suitable so long as the edge of the first shell being inserted into the second shell was deburred so that the cables were not damaged during adjustment of the CTA 10.
Due to the fact that the shell 80 is inserted into the shell 50, the interior cavities 58, 88 are in communication. This allows cables 40 to connect between connectors on the first and second faces and provide the flexibility suitable to allow the first and second faces to be adjusted in position, relative to each other. The depicted cable tray assembly design has the ability to expand and compress +/−20 mm from the nominal face to face dimension. This means that there is about 40 mm of difference between the first and second faces 60, 90 when the CAT 10 is in a compressed state, such as is depicted in
The adjustment system can be configured as desired. In one embodiment a adjustment system 130 can be used. It has been determined that a shaft 132 with a threaded portion 36 and a thumbscrew 34 allows for desirable precision and control of the adjustment. An optional locking nut 138 can be used to prevent subsequent inadvertent adjustment (such as could be caused by vibration). If two adjustment systems are provided on opposite edges of the CTA 10 then it will be beneficial to adjust both together so that one shell does not become angled compare to the other shell. If less precision and control is needed then the adjustment system 140 with a telescoping shaft 142 can be used and the CTA 10 can be biased toward an expanded state if desired with a spring or other known biasing structure provided with the adjustment system 140.
Adjustability of the first and second faces 60, 90 helps solve issues of dimensional variability and can allow the CTA 10 to absorb positional variance of the mating assemblies. If sized correctly, the CTA 10 could be configured to even greater dimensional flexibility than the 40 mm noted above but given the additional cost of such a system, such a configuration would primarily be of interest in lower volume applications.
One issue that results from adjustability is that some electromagnetic interference (EMI) leakage may result. To help minimize EMI issues, the depicted design can provide EMI shielding via adhesive conductive foam gaskets on each some of the shell sides. These gaskets can be configured to be compressed against the chassis walls. Also, because the shells 50, 80 move in relation to one another, in an embodiment a spring finger gasket 140 can be provided to help provide shielding between the two shells 50, 80.
The disclosure provided herein describes features in terms of preferred and exemplary embodiments thereof. Numerous other embodiments, modifications and variations within the scope and spirit of the appended claims will occur to persons of ordinary skill in the art from a review of this disclosure.
This application claims priority to U.S. Provisional Application No. 62/316,063, filed Mar. 31, 2016, which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62316063 | Mar 2016 | US |
