Abstract:
A radial optical data interchange packaging comprises a central core; a plurality of central core photo transceivers emerging from an exterior side surface of the central core; a mother board coupled to the central core, wherein the mother board is perpendicularly oriented below and abutting the central core; a plurality of retention slots on the mother board, wherein the retention slots radially extend away from the central core; and a plurality of cards held by the retention slots, wherein each of the plurality of cards comprises a set of card photo transceivers that optically communicate with the central core photo transceivers.

Description:
BACKGROUND 
     The present disclosure relates to the field of computers, and specifically to computers having multiple circuit boards. Still more particularly, the present disclosure relates to communicatively coupling circuit boards in a computer system. 
     BRIEF SUMMARY 
     In one embodiment of the present disclosure, a radial optical data interchange packaging comprises a central core; a plurality of central core photo transceivers emerging from an exterior side surface of the central core; a mother board coupled to the central core, wherein the mother board is perpendicularly oriented below and abutting the central core; a plurality of retention slots on the mother board, wherein the retention slots radially extend away from the central core; and a plurality of cards held by the retention slots, wherein each of the plurality of cards comprises a set of card photo transceivers that optically communicate with the central core photo transceivers. 
     In one embodiment of the present disclosure, an optical rack comprises a first mother board and a second mother board, wherein the first mother board is inter-coupled to the second mother board by a first central core and a second central core, and wherein the first mother board is perpendicularly oriented below and abutting the first central core and the second mother board is perpendicularly oriented below and abutting the second central core; a plurality of central core photo transceivers emerging from exterior side surfaces of the first and second central cores; a plurality of retention slots on the first and second mother boards, wherein the retention slots radially extend away from the first and second central cores; and a plurality of cards held by the retention slots, wherein each of the plurality of cards comprises a set of card photo transceivers that optically communicate with the central core photo transceivers on the first and second central cores. 
     In one embodiment of the present disclosure, a computer system comprises an optical rack that comprises: a first mother board and a second mother board, wherein the first mother board is inter-coupled to the second mother board by a first central core and a second central core, and the first mother board is perpendicularly oriented below and abutting the first central core and the second mother board is perpendicularly oriented below and abutting the second central core; a plurality of central core photo transceivers emerging from exterior side surfaces of the first and second central cores; a plurality of retention slots on the first and second mother boards, wherein the retention slots radially extend away from the first and second central cores; and a plurality of cards held by the retention slots, wherein each of the plurality of cards comprises a set of card photo transceivers that optically communicate with the central core photo transceivers on the first and second central cores. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  depicts details of an exemplary computer that may be utilized by the present disclosure; 
         FIG. 2  depicts an exemplary optical rack holding multiple mother boards; 
         FIG. 3  illustrates additional detail of a mother board, cards on the mother board, and a central core that is photo electrically coupled to the cards; 
         FIG. 4  depicts additional detail of the photoelectric coupling of the cards to the central core; and 
         FIG. 5  illustrates additional detail of the central core. 
     
    
    
     DETAILED DESCRIPTION 
     As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, micro-code, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module” or “system.” Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon. 
     Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. 
     A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. 
     Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including, but not limited to, wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. 
     Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user&#39;s computer, partly on the user&#39;s computer, as a stand-alone software package, partly on the user&#39;s computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user&#39;s computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). 
     Aspects of the present invention are described below with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
     With reference now to the figures, and in particular to  FIG. 1 , there is depicted a block diagram of an exemplary computer  102 , which may be utilized by the present invention. Note that some or all of the exemplary architecture, including both depicted hardware and software, shown for and within computer  102  may be utilized by a card  206  (shown in  FIG. 2 ) and/or an optical link chip  302  (shown in  FIG. 3 ). 
     Computer  102  includes a processor  104  that is coupled to a system bus  106 . Processor  104  may utilize one or more processors, each of which has one or more processor cores. System bus  106  is coupled via a bus bridge  112  to an input/output (I/O) bus  114 . An I/O interface  116  is coupled to I/O bus  114 . I/O interface  116  affords communication with various I/O devices, including an optical interface  130 . Optical interface  130  comprises an array of optical transducers  128  used to optically communicate digital and/or analog information to and from the computer  102 . In one embodiment, optical interface  130  is an integral component of processor  104 , thus providing a very high speed communication between the optical transducers  128  and a core (not depicted) of the processor  104 . A system memory  136 , which is defined as a lowest level of volatile memory in computer  102 , includes additional higher levels of volatile memory (not shown), including, but not limited to, cache memory, registers and buffers. Data that populates system memory  136  includes computer  102 &#39;s operating system (OS)  138  and application programs  144 . Such data may be from a non-volatile memory  120  (e.g., read only memory—ROM, programmable ROM—PROM, etc.), or such data may be directly downloaded from an external source (not shown), or such data may be from a local hard disk drive, CD-ROM drive, etc. (also not shown). 
     OS  138  includes a shell  140 , for providing transparent user access to resources such as application programs  144 . Generally, shell  140  is a program that provides an interpreter and an interface between the user and the operating system. More specifically, shell  140  executes commands that are entered into a command line user interface or from a file. Thus, shell  140 , also called a command processor, is generally the highest level of the operating system software hierarchy and serves as a command interpreter. The shell provides a system prompt, interprets commands entered by keyboard, mouse, or other user input media, and sends the interpreted command(s) to the appropriate lower levels of the operating system (e.g., a kernel  142 ) for processing. Note that while shell  140  is a text-based, line-oriented user interface, the present invention will equally well support other user interface modes, such as graphical, voice, gestural, etc. 
     As depicted, OS  138  also includes kernel  142 , which includes lower levels of functionality for OS  138 , including providing essential services required by other parts of OS  138  and application programs  144 , including memory management, process and task management, disk management, and mouse and keyboard management. 
     Application programs  144  include an optical interface control program (OICP)  148 . OICP  148  includes code for implementing the processes described below, including those described with  FIGS. 2-5 . 
     The hardware elements depicted in computer  102  are not intended to be exhaustive, but rather are representative to highlight essential components required by the present invention. For instance, computer  102  may include alternate memory storage devices such as magnetic cassettes, digital versatile disks (DVDs), Bernoulli cartridges, and the like. These and other variations are intended to be within the spirit and scope of the present invention. 
     With reference now to  FIG. 2 , an exemplary radial optical data interchange packaging is depicted as one or more components of optical rack  202 , as described herein. Optical rack  202  is shown holding multiple mother boards, including the labeled mother board  204 . Each mother board supports multiple cards, including labeled card  206 . These cards may be server blades (e.g., computer  102  shown in  FIG. 1 ), power supplies, memory cards, input/output cards, etc. Each card may be dedicated to single function, such as processing, memory, input/output functions, etc., or a card may be a multifunctional card (e.g., a server blade). Similarly, each mother board may be dedicated to holding a single type of card (e.g., only memory cards), or various mother boards may hold different types of cards (e.g., a combination of server cards, memory cards, I/O cards, etc.). 
     As depicted in  FIG. 2 , the cards (including labeled card  206 ) extend radially away from a central core  208 , thus minimizing communication distances. Each central core (e.g., central core  208 ) is able to optically communicate with other central cores, as described further herein. Thus, the optical rack  202  comprises optical communication between different books/racks/floors/layers (e.g., areas in which a different mother board is located) as well as among various cards, including cards on a same mother board as well as cards on different mother boards. In one embodiment, central core  208  is a cylinder having a circular cross section, as depicted in  FIG. 2 . In other embodiments, central core  208  has a square, rectangular, oval, or other geometric cross section. 
     Referring now to  FIG. 3 , additional detail of mother board  204 , cards (e.g., card  206 ) on mother board  204 , and central core  208  is presented. Each card (e.g. card  206 ) is mounted on its edge in a retention slot  304 . In one embodiment, each retention slot  304  provides only mechanical support for a card  206 . In another embodiment, a retention slot  304  provides additional electrical support for a card  206 , including power, ground, etc. 
       FIG. 4  presents an enlarged view of the middle of  FIG. 3 , and presents additional detail of arrays of photo transceivers, including those depicted as central core photo transceiver  402  and card photo transceiver  404 , that carry data and clock information from the cards to the central core  208 . Note that the central core photo transceivers (including element  402 ) emerge from an exterior side surface of the central core  208 . The array of card photo transceivers (including element  404 ) are mounted to an edge of the card  206 , and mate up against the central core photo transceivers for optical communication connection. The central core  208 , as depicted in  FIG. 5 , also features an array of optical transceivers on the top and bottom sides, including the depicted inter-core optical transceiver  502 . These inter-core optical transceivers provide an interconnect between books/drawers/layers/mother boards in the system housed by the optical rack  202  (shown in  FIG. 2 ) in order to pass clock and data. 
     Note that the optical transceivers (elements  128  in  FIG. 1 , elements  402  and  404  in  FIG. 4 , and element  502  in  FIG. 5 ) may be any of various types of optical transceivers. For example, in one embodiment an optical transceiver may simply be a terminating end of an optic fiber, which may be outfitted to feature multiple laser diodes of differing wavelengths to provide multiple communications channels per element. In one embodiment, an optical transceiver may comprise a light emitting diode that responds to a current from a metal wire. In one embodiment, a transceiver may comprise any type of photoreceptor (e.g., a photo resistor, a photo diode, a photo transistor, etc.) that responds to light inputs in a known and consistent manner. Thus, the transceivers described herein may be any combination of metal wire, optic fiber, and/or optic interfaces used to optically communicate information, both digital as well as analog. 
     Returning to  FIG. 3 , note that an optical link chip (OLC)  302  is oriented within the central core  208 . OLC  302  controls the routing of signals to various cards via various photo transceivers. That is, within central core  208  are multiple optic fibers and/or metal wires. Signals coming through these fibers/wires are directed to the OLC  302 , which then sends the signal to the appropriate photo transceivers, including elements  402 ,  502  and, indirectly,  404  (depicted in  FIGS. 4 and 5 ) as described herein. Thus, a signal may be directed to a particular card via OLC-selected pairs of central core photo transceivers  402  and card photo transceivers  404 . Similarly, OLC  302  can direct inter-core/layer communication by directing signals between inter-core optical transceivers  502 . This inter-core/layer communication is achieved by passing light signals through holes (not shown) that have been drilled into the mother boards. 
     Utilizing the features described herein, one embodiment of the present disclosure is an innovative architecture to provide a central optical interconnect between processor books (sets of cards on different mother boards) in a supercomputing environment. The architecture described herein provides increased speed for communication between cards, and eliminates problems that accompany high-speed copper-based signaling. This results in a reduction of complications resulting from the issues related to signal integrity and electromagnetic compatibility. The architecture described herein also simplifies the physical design layout process, requiring fewer signal layers. Arranged in a radial fashion, the edge of each processor card is outfitted with an array of optical transceivers. These communicate with a central core, which is outfitted with an array of optical transceivers for each processor card. 
     As described in one embodiment herein, optical transceivers are also placed on the top/bottom of the central core to provide an optical communication link between drawers. As noted in the illustrations of the present disclosure, the drawer&#39;s planar may be of a rectangular shape. Placement of the high speed computing and communication channels (including wiring, optic fibers, optical transceivers, etc. described herein) central to the machine in which the radial optical data interchange packaging is housed allows lower electromagnetic emissions (EME) since higher speed transitions off the mother boards via copper to optical conversion or electronics switching is located close to the center of the circuit board (drawer board). This allows board attenuation to occur as signal energy drops as one moves away from the center of communication. 
     To provide the maximum amount of bandwidth, each optical element in the array may be outfitted with several laser diodes and photodiodes of varying wavelengths. This enables multiple channels of communication for each element. Note that in one embodiment, if optical transceivers are integrated within the processor itself (e.g., OLC  302 ), the proximity of the modules to the central core avoids the copper between the processor and optical modules at the card to core edge. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of various embodiments of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated. 
     Having thus described embodiments of the invention of the present application in detail and by reference to illustrative embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.