Patent Grant
7318750
1. Field of the Invention
The present invention relates generally to computer systems, and more particularly to an apparatus for using or accessing a plurality of host computers by using a PCB card edge connector to connect to the host computers.
2. Description of Related Art
In many applications, it is advantageous to interconnect a single computer to multiple computers. For example, a keyboard/video/mouse (“KVM”) switch is a device that is generally connected to multiple computers (“host computers”) in order to enable a single keyboard, video display monitor and mouse (the “user console”) to control each of the connected computers. Similarly, there also exists an enhanced version called a keyboard/video/mouse/audio (“KVMA”) switch that includes the ability to enable a single set of speakers to be selectively routed to each of the connected computers. In this way, a user may have access to multiple host computers without having to deal with the clutter and space requirements of having separate keyboard, monitor, and mouse for each of the computers. When the user accesses a host computer connected to the KVMA switch, video signals are routed from the computer, processed, and displayed on the single video monitor. Generally, to access another host computer, the user either physically actuates buttons or other mechanisms on the body of the KVMA switch. Some KVMA switches utilize software switching, wherein software is loaded on all of the host computers and a user selects an active host computer by pressing a combination of keys on the keyboard and/or clicking buttons on the mouse of the user console.
Regardless of the method of selecting the active host computer, there are many cables and wires for a computer user to connect between the KVMA switch and the host computers, as well as the cables for the interface devices. In particular, the cables that connect each host computer to the KVMA switch can include: a video cable, cursor control signal cable, a keyboard control signal cable, and audio out signal cable. Accordingly, with each host computer added to the KVMA switch, four additional cables are needed (three if USB type connectors are used). This can make things complicated for the non-technically savvy individual both when she initially sets-up a KVMA switch and if the user later wants to move a host computer or add additional ones.
One approach to simplify the setup of a KVMA switch utilizes a set of host computer cables integrated into the KVMA switch base, so that there are no connectors for the user to hook-up on one end of the host computer cables, as they simply extend from the KVMA switch base (“extending cables”). This approach does simplify the set-up of the KVMA switch for the user; however, there are several drawbacks to this approach. First, because the length of the extending cables is fixed by the manufacturer of the KVMA switch, the length can not be altered by the user. The manufacturer could offer the KVMA switch with several lengths of cables, but that would create excess inventory to deal with and the potential users would be forced to make a choice and stick with it for the life of the product. Second, if the user wants to later move one of his or her host computers to a different location, there is no way to lengthen or shorten the cables (short of hiring a technician to splice the cables—an expensive and inefficient approach that will likely causes signal loss and/or introduce noise into the cables as well). Third, a particular embodiment of the KVMA switch can control up to say four computers and the user only wants to control three, there will be an extra length of unused bulky cable to leave dangling from the KVMA switch.
Another approach to simplify the setup of a KVMA switch reduces the number of connectors attached from the KVMA body or housing to each host computer controlled by the KVMA switch, by combining the video signal, cursor control signal, and keyboard control signal cables into one video signal connector. This can be accomplished by utilizing the extra connection pins in the industry standard DB15 video signal connector utilized with video signals transmitted under the video graphics array (“VGA”) standard. A separate connector is still required for the audio out signal cable for each host computer. The use of the combined video signal, keyboard signal and cursor control signals into one custom designed, non-standard connector for each host computer does significantly reduce the number of cables and connectors required for hooking-up each host computer to the KVMA switch body, so that two connectors are required to control each host computer with the KVMA switch, thereby improving the ease of set-up for users, but there is still room for further improvement.
It is desirable, therefore, to provide a KVMA switch that is easy and quick to set-up, preferably having only one cable and connector that needs to be connected to the KVMA switch housing. Such an apparatus can have the added benefit of avoiding the introduction of noise and signal loss into the signal paths by minimizing the signal path length and the number of discrete internal connection wires utilized in attaching the host computers to the KVMA switch body. Additionally, such an apparatus could reduce the cost to the manufacturer, wholesaler, distributor, and to the end user.
A computer management apparatus is provided for interconnecting a user console including peripheral devices, such as a console keyboard, a console video display unit, a console mouse, and speakers for connecting to a plurality of host computers, selectively accessed via the user console (“KVMA cartridge”), wherein the host computers interface with the KVMA cartridge via a single removable edge connector with a first set of cables that attach to the plurality of host computers. The KVMA cartridge connects to the edge connector via a leading edge of a circuit board having a plurality of traces on the leading edge with electrical leads connected to a switching circuit within the KVMA cartridge.
In another embodiment, the user may change the length of the first set of cables by adding an extension cartridge with a second set of cables to the KVMA cartridge. The extension cartridge is connected between the KVMA cartridge's leading edge and the edge connector with the first set of cables. This allows the user to lengthen the total cable length from the KVMA cartridge to the host computers with just one additional cable and connector on each end.
In another embodiment of the present invention, the KVMA cartridge connects to the plurality of host computers through a hub unit. The KVMA cartridge has a first leading edge that extends from a KVMA cartridge housing and connects to a first edge connector mounted on a hub unit housing. The plurality of host computers connect directly to the hub unit housing by a first set of computer cables with a plurality of plugs. The switching circuit contained within the KVMA cartridge selectively connects the user console to the input and output signals of one of the host computers selected by the user.
In yet another embodiment of the present invention, the first set of computer cables corresponds to a first color code and the and the second set of computer cables corresponds to a second code. The edge connector comprises an edge interface that identifies the first set of computer cables with the first color code and the second set of computer cables with the second color code. The KVMA cartridge has an indicator that indicates the first color code when a set of connector ports are connected to the first set of computer cables and the second color code when the set of connector ports are connected to the second set of computer cables.
A more complete understanding of the apparatus for enabling a single user console manage, control, and view a plurality of host computers utilizing a KVMA cartridge that interfaces with a plurality of host computers via a single interlocking connector will be afforded to those skilled in the art, as well as a realization of additional advantages and objects thereof, by a consideration of the following detailed description of the preferred embodiment. Reference will be made to the appended sheets of drawings which will first be described briefly.
The present invention provides an apparatus for accessing a plurality of host computers from a user console and allowing a user to selectively switch signals including keyboard, video signal, mouse and audio signals, from each of the host computers with a KVMA switch utilizing a cartridge design (“KVMA cartridge”) that interfaces with a plurality of host computers via a single interlocking connector. In the detailed description that follows, like element numerals are used to indicate like elements appearing in one or more of the figures.
In one embodiment of the invention, computer management system 100 comprises a computer management apparatus or KVMA cartridge 102 that is connected between a user console 101 and host computers 104 and 106. The user console 101 has input devices comprising a console keyboard 112 and a console cursor control device 114. The user console 101 also has output devices comprising a console video display monitor or display device 110 and console speakers or audio devices 116. The KVMA cartridge 102 processes signals from the console keyboard 112 and the console cursor control device 114 for use by the appropriate host computer 104 or 106 selected by the user, such that the cursor control device signal inputs 126 and 128 and the keyboard signal inputs 122 and 124, respectively, are routed to the appropriate host computer.
Similarly, the KVMA cartridge 102 processes the audio signal outputs 130 and 132, as well as the video signal outputs 118 and 120 from the host computers 104 and 106, such that audio signal outputs 130 and 132 and video signal outputs 118 and 120 respectively, from the appropriate host computer selected, may be heard on speakers 116 and displayed on the console video display monitor 110. Audio and video signals are transmitted through the system 100 from the host computers 104 and 106 to the console 101. Collectively, the video signal outputs 118 and 120, the audio signal outputs 130 and 132, the keyboard signal inputs 122 and 124, and the cursor control device signal inputs 126 and 128, will be referred to as the “host computer peripheral signal inputs and outputs” herein.
Generally, existing video display monitors such as the console video display monitor 110, can receive analog video signals (such as those transmitted under the video graphics array (“VGA”) standard), digital video signals (such as those transmitted under the digital video interface-integrated (“DVI-I”) standard), or both. Such video monitors can also include a display data channel to transmit monitor information, in accordance with the Video Electronics Standards Association (VESA) DDC2B standard, as selected by the user by use of the remote switch 108a.
As illustrated in
The computer cables 212a and 212b are molded together and run side-by-side in parallel along a portion of their respective lengths beginning at the proximal end protruding from a connector cover 206 and split apart at the distal end to connect the computer cables 212a and 212b to the host computers 104 and 106, respectively. The cables at some point split apart since the host computers 104 and 106 are physically separated from each other in most situations as illustrated in
In this exemplary embodiment, computer cables 212a and 212b extend out of the distal end of the KVMA cartridge 102 and have identical plugs on the ends that attach to host computers 104 and 106, respectively. Connectors 402 and 404 are video connector plugs that allow the video out signals 118 and 120 to be electrically coupled to computer cables 212a and 212b, respectively. Similarly, audio connector plugs 406 and 408 allow the audio out signals 130 and 132 to be electrically coupled to computer cables 212a and 214b; and USB connector plugs 410 and 412 that function as both keyboard connector plugs and cursor control connector plugs are electrically coupled to both the keyboard inputs or keyboard signal inputs 122 and 124, as well as to the cursor control device signal inputs 126 and 128. In effect, the KVMA base 102 acts as a switched USB hub with regard to selectively coupling the USB connector plugs 410 and 412 to the connectors 428 and 424, when the user selects the host computer 104 or 106 with the selector buttons 214a and 214b.
In
In the exemplary embodiment illustrated in
The KVMA cartridge can optionally have a multi-colored light emitting diode (“LED”) indicator 220 that emits two different colors (such as yellow and green) to indicate when host computer 104 or 106 is selected by the user. The remote control device can have a multi-colored LED indicator (not shown) that emits two different colors (such as yellow and green) corresponding to the two colors of the LED 220 that light up when the user selects one of the host computers 104 or 106 with the activation button on the remote control device. One of skill in the art Will recognize that the features and functions of the LED can vary within the spirit and scope of the invention.
In addition to the colored thumb screws 208a and 208b, in the embodiment of
In yet another variation of the embodiment shown in
The KVMA cartridge 202 further comprises a switching circuit (not shown), selector switches or selector buttons 214a and 214b, a housing (not shown), and a circuit board. The switching circuit is a component of the internal circuitry (not shown) of the KVMA cartridge 102. The cartridge interface further comprises a plurality of traces 224, electrical leads (not shown), threaded inserts or receptacles 220a and 220b, and a socket or receptacle 218. The cartridge interface removably connects to an edge interface (not shown) that includes a printed circuit board (“PCB”) edge connector or edge connector 204 that includes a slot with contacts 228, and computer cables 212a and 212b. The edge connector 204 is protected by a connector cover 206 that comprises a strain relief 210, threaded thumb screws 208a and 208b protruding from the end of the connector cover 206 proximate to the strain relief 210, and screw threads 226a and 226b proximate to the edge connector 204, and a protrusion or placement pin 216.
Looking closer now at the details of this exemplary embodiment, KVMA cartridge 102 is operatively connected to the peripheral devices that comprise the user console 101, e.g., the console video display monitor 110, console keyboard 112, console cursor control device 114, and console speakers 116 (illustrated in
In operation, the user selects or toggles between the host computers 104 and 106 (shown in
The host computer peripheral signal inputs and outputs are coupled to the switching circuit through the plurality of traces 224 that are etched or bonded onto the leading edge 222 and the plurality of traces 224 comprise electrical leads that electrically connect the signal inputs and outputs to the switching circuit. The leading edge 222 and the circuit board 230 are one continuous surface with the leading edge being a part of the circuit board 230 that partially extends out of the cover 202 and the balance of the circuit board 230 contained within the internal portion of the housing.
A benefit to the present invention is the use of the edge connector 204 with a set of computer cables 212a and 212b that connect the plurality of host computers 104 and 106 to the KVMA cartridge 102 with just one connector on the outside portion of the housing of the KVMA cartridge. This simplifies the set-up of the KVMA cartridge 102, reduces clutter, and reduces the manufacturing cost as compared to conventional KVMA switches both in terms of reduced parts count and reduced labor to manufacture the apparatus. Additionally, by connecting the computer cables 212a and 212b from the plurality of host computers 104 and 106 directly to the circuit board 230 by the single edge connector 204, the potential for signal loss and the introduction of noise into the signal paths is reduced. A further benefit is the ability to eliminate extra unused computer cables left dangling from the KVMA cartridge 102 when the user wishes to hook-up and control a lesser number of host computers than the switching circuit within the KVMA cartridge 102 is capable of handling.
The extension cartridge comprises an extension strain relief 304, an extension cartridge cover 306, an extension socket or receptacle 308, extension threaded inserts 310a and 310b, an extension leading edge 312 and an extension circuit board (not shown). Other components illustrated in this embodiment are: an extension connector 314, an extension pin or protrusion 316, extension screw threads 318a and 318b, an extension connector cover 320, extension threaded thumb screws 322a and 322b, an extension strain relief 324, and extension cables 326a and 326b. The extension cables 326a and 326b are similar to computer cables 212a and 212b in that extension cables 326a and 326b extend outward from the extension connector 314. The extension cables 326a and 326b have a plurality of connector plugs on their distal ends (not shown) that connect to host computers 104 and 106 (shown in
In another embodiment of the present invention (not shown), a KVMA cartridge connects to a plurality of host computers through a hub unit. The KVMA cartridge has a leading edge extending from the housing that operatively connects to an edge connector mounted on a hub unit housing. In a variation of this embodiment, a plurality of KVMA cartridges operatively connect to a plurality of edge connectors mounted on the hub unit. In both of these embodiments, the plurality of host computers connect directly to the hub unit with a first set of computer cables, wherein the first set of computer cables comprise a card edge connector that operatively connects to a leading edge extending from the hub unit housing. In a variation of these two embodiments, the plurality of host computers have a plurality of computer cables operatively connected to the hub unit by a plurality of connectors extending from the exterior of the hub unit. In all of these embodiments, the input and output signals of the host computers are operatively connected to the user console via internal circuitry of the hub unit. The switching circuit contained within the KVMA cartridge selectively connects the user console to the input and output signals of one of the host computers selected by the user.
In yet another embodiment of the present invention (not shown), a KVMA cartridge has a first set of computer cables extending from a first leading edge of the KVMA cartridge. The first leading edge connects to the first set of computer cables by a first card edge connector that in turn has a second card edge connector on the opposite end of the first set of computer cables. The second card edge connector operatively connects to a second leading edge extending from a hub unit housing. The plurality of host computers then connect directly to the housing of the hub unit by a second set of computer cables that attach to one or more connectors mounted on the housing of the hub unit. The second set of computer cables operatively connect input and output signals of the host computers to the hub unit and the switching circuit contained within the KVMA cartridge selectively connects the user console to one of the host computers selected by the user.
One advantage to this embodiment is that the hub unit can be placed a relatively large distance from the plurality of host computers with just a single set of connectors and a single set of computer cables running between the hub unit and the KVMA cartridge and a conventional set of connectors with relatively short separate corresponding cables and plugs attached to each of the plurality of host computers.
Having thus described a preferred embodiment of an apparatus for accessing a plurality of host computers from a single console and allowing the user to selectively access the user console, wherein the host computers interface with the management apparatus via a removable edge connector, it should be apparent to those skilled in the art that certain advantages of the invention have been achieved. For example, the use of the leading edge of the circuit board to operatively connect to the host computers, wherein the leading edge comprises a plurality of traces with electrical leads connected to a switching circuit within the apparatus have been illustrated, but it should also be appreciated that various modifications, adaptations, and alternative embodiments thereof may be made within the scope and spirit of the present invention. The invention is solely defined by the following claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5400246 | Wilson et al. | Mar 1995 | A |
| 5406450 | Shieh | Apr 1995 | A |
| 5424903 | Schreiber | Jun 1995 | A |
| 5507668 | Lambrinos et al. | Apr 1996 | A |
| 5596479 | Campbell et al. | Jan 1997 | A |
| 6134612 | Bailey et al. | Oct 2000 | A |
| 6747878 | Hipp et al. | Jun 2004 | B1 |
| 6834980 | Okano et al. | Dec 2004 | B2 |
| 20030032333 | Kwong | Feb 2003 | A1 |
| 20050047079 | Gasbarro et al. | Mar 2005 | A1 |
