Abstract:
A stacked connector, suitable for use on a printed circuit board of a computer, for conserving connection space by providing two or more connector sockets, preferably oriented one atop the other. One or more of the connector sockets may be configured to prevent the insertion of an improper plug type having a similar form factor which is capable of being inserted into one of the sockets.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
       [0001]    The present invention stems from, and claims priority to, U.S. provisional patent application serial No. 60/357,082 filed on Feb. 15, 2002, the entire contents of which are hereby incorporated by reference. 
     
    
     
       FIELD OF THE INVENTION  
         [0002]    The present invention generally relates to electrical connectors. More particularly, the present invention is related to ganged or stacked connectors for computers and related electronic devices including connectors which can prevent the insertion of an improper plug type.  
         BACKGROUND OF THE INVENTION  
         [0003]    As computers become smaller and smaller, “real estate”, e.g. physical space on the computer and circuit boards associated therewith, becomes more precious. Even desktop systems, which are also continuously being reduced in size, benefit from conservation of circuit board real estate since costs may be reduced by shrinking footprints and form factors and reducing the number of discreet components which must be inserted, assembled, and otherwise processed during manufacture. In addition, to the extent that the number of connection points increases, for example, parallel ports, serial ports, USB ports, network ports, telephone jacks, and the like, space must be conserved. The degree to which an increasing number of these connectors can be placed side by side on a circuit board such as a mother board becomes limited and thus real estate efficiency gains from interface connector placement is of paramount importance.  
           [0004]    One area where gains may be achieved is in the area of the connectors themselves. Electrical connectors are extremely diverse in type and number. In computer systems, connectors are used in areas including, for example, communications, power distribution, data distribution, individual electrical signals, and the like. Conventional connectors for external interface such as communications interfaces or the like, are usually mounted directly along the surface of a circuit board as described, usually along the part of the circuit board corresponding to the back or side of the computer system. Although some gains may be made in minimizing the size of the connector housings, side by side placement of connectors still results in inefficient use of circuit board space as well as space along the back or side surfaces of the computer or electronics cabinet in which the circuit board is housed.  
           [0005]    Another problem associated with the increase in the number of connectors provided on computer systems is the degree to which some standard connectors have sub-compatible form factors which can be cross-plugged. An example would be the cross-pluggability of RJ-11 plugs into RJ-45 jacks. Several devices have been proposed in attempts to prevent the insertion of the improper plug type. However, none of these devices teach or suggest a solution to the abovementioned problem concerning limited space on motherboards.  
           [0006]    It should be noted that in modem computer applications, the RJ-45 connector series is typically used for network connections. Since, however, the RJ- 45  jack was originally designed to accept both RJ-45 plugs as well as RJ-11 plugs, and since RJ-11 plugs are generally used to connect modems to phone lines, problems arise when inadvertent cross-plugging occurs. When an RJ-11 plug coupled, for example, to a phone system is plugged into the RJ-45 jack, the phone service associated with the RJ-11 line is disrupted until the RJ-11 plug is disconnected from the RJ-45 network jack. In addition, power pins associated with the RJ-11 plug may be connected to data lines associated with the RJ-45 jack with damaging results particularly during, for example, the generation of ring voltage or the like. It may also be possible to damage telephone equipment.  
           [0007]    Consequently, it would be desirable to overcome the problem of connector bay crowding while preventing the insertion of RJ-11 plugs typically associated with phone lines into RJ-45 jacks typically associated with network connections.  
         SUMMARY OF THE INVENTION  
         [0008]    Accordingly, the present invention is directed to a stacked connector for conserving connection space by providing at least a first and second socket preferably one atop the other, and for preventing the insertion of an improper plug type capable of being inserted into one of the sockets.  
           [0009]    In accordance with various exemplary embodiments, the stacked connector of the present invention preferably includes a housing having a first and second plug receiving cavity associated with the first and second sockets. The first plug receiving cavity, e.g. the one associated with the first socket and at least one of the plug types may include a plug prevention mechanism. It will be appreciated that the plug prevention mechanism is disposed within the first plug receiving cavity so as to be capable of contacting and preventing the improper plug type when the improper plug type is plugged into the first socket. It will further be appreciated that the plug type further includes an RJ-11 plug type and an RJ-45 plug type, with the improper plug type preferably including the RJ-11 plug type and the proper plug type preferably including the RJ-45 plug type.  
           [0010]    In accordance with one embodiment, the plug prevention mechanism includes a blocking tab with a resilient curved portion and a finger extending into an upper narrow portion of the first plug receiving cavity, the finger being upwardly movable when the curved portion is pushed, e.g. by the proper plug. It should also be noted that it is preferable to have a complementary curved portion and finger on each side of the plug receiving cavity.  
           [0011]    In accordance with another exemplary embodiment, the plug prevention mechanism includes a blocking tab comprising a flexible cantilevered arm, extending from a rear wall associated with the plug receiving cavity, formed integrally with the housing and having a distal free end projecting into the first plug receiving cavity. The flexible cantilevered arm preferably has a stop surface and a sliding surface. The stop surface may be positioned within the first plug receiving cavity for contacting a leading surface of the improper plug type, e.g. the RJ-11 plug type, when the improper plug type is inserted. Further insertion of the improper plug type into the first plug receiving cavity is thereby stopped. It should be noted that the sliding surface, beginning at the distal free end of the flexible cantilevered arm, which free end is located adjacent to a front wall of the housing, is positioned within the first plug receiving cavity a lateral distance from a width centerline of the plug receiving cavity such that the sliding surface will contact a leading surface associated with the proper plug type at a predetermined distance from the width centerline less than one half the proper plug width dimension and greater than one half the improper plug width dimension. Accordingly, the sliding surface slidably contacts the leading surface associated with the proper plug type as the proper plug type is inserted into the first plug receiving cavity causing the flexible cantilevered arm to bend such that the stop surface is moved out of the way and thus out of engagement with the leading surface of the proper plug type. Complete insertion thereof into the first plug receiving cavity is thereby allowed.  
           [0012]    In accordance with yet another exemplary embodiment, the plug prevention mechanism of the present invention includes a deflection member formed of a metal sheet material, having a retention section, a ramp surface and a blocking tab. The retention member may be mounted, for example, in a slot in the housing, with the ramp surface extending into the first plug receiving cavity so as to be able to contact the proper plug type and the blocking tab may extend laterally from the ramp surface further into the first plug receiving cavity so as to contact and stop the insertion of the improper plug type. Accordingly, when the proper plug type is inserted into the first plug receiving cavity, the ramp surface is engaged and the blocking tab deflects away from the proper plug type thereby allowing insertion into the first plug receiving cavity. As described, the improper plug type will not contact the ramp surface and thus is stopped by the blocking tabs, preventing insertion thereof.  
           [0013]    In accordance with still another exemplary embodiment, the plug prevention mechanism may be coupled to at least one opposite side wall associated with the housing and the first plug receiving cavity and may include at least one base portion engaged with the housing, at least one resilient arm extending from the base portion and positioned in a corresponding recess of the opposite side wall, and at least one baffle projecting from the resilient arm into the first plug receiving cavity for stopping the insertion of an improper plug type. The housing may further include at least one slot defined in the opposite side wall for receiving the base portion and for fixing the prevention mechanism, e.g. the base, the resilient arm, and the baffle, to the housing.  
           [0014]    In accordance with still another exemplary embodiment, the plug prevention mechanism includes a base fixed to the housing, a resilient stem extending forwardly from the base and through a corresponding side wall of the housing and into the first plug receiving cavity. A curved force receiving portion may be formed near a free end of the resilient stem and a stop tongue located between the force receiving portion and the base and extending from the resilient stem into a channel defined in an upper wall of the housing. It should be noted that the curved portion projects a shorter distance from the corresponding side wall into the first plug receiving cavity than the stop tongue projects from the corresponding side wall into the channel.  
           [0015]    In accordance with various alternative exemplary embodiments, in the stacked connector of the present invention, the second plug receiving cavity may be identical to the first plug receiving cavity, e.g. may have a plug prevention mechanism. Alternatively, the second plug receiving cavity may be configured to receive a plug type different from the plug type associated with the first plug receiving cavity, including any one of: an A type USB plug, a B type USB plug, and a RJ-11 plug type. As previously noted, the first and second plug receiving cavity are preferably configured in a manner one atop the other, or may alternatively be configured in a manner including one alongside the other. The stacked connector of the present invention may further including a third plug receiving cavity, wherein the first, second, and third plug receiving cavity are configured in a manner including one atop the other. In such an arrangement several combinations are possible, e.g. the first plug receiving cavity may be associated with an RJ-45 plug type and the second and third plug receiving cavity may be associated with a USB A plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type and the second and third plug receiving cavity may be associated with a USB B plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB A plug type, and the third plug receiving cavity may be associated with a USB B plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB A plug type, and the third plug receiving cavity may be associated with an RJ-11 plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB B plug type, and the third plug receiving cavity may be associated with an RJ-11 plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type and the second and third plug receiving cavity may be associated with a RJ-11 plug type.  
           [0016]    In accordance with still another alternative exemplary embodiment, a stacked connector may be provided for conserving connection space having at least a first and second socket. The stacked connector may preferably comprise a housing; a first plug receiving cavity associated with the first socket; and a second plug receiving cavity associated with the second socket. The second plug receiving cavity may be configured with a plug prevention mechanism for preventing the insertion of an improper plug type. The plug prevention mechanism may be disposed within the first plug receiving cavity so as to be capable of preventing insertion of the improper plug type when the improper plug type is plugged into the first socket. As in other embodiments, the plug types may include an RJ-11 plug type, e.g. the improper plug type, and an RJ-45 plug type, e.g. the proper plug type. The first plug receiving cavity may be configured to receive a plug type including any one of: an A type USB plug, a B type USB plug, and a RJ-11 plug type. The first and second plug receiving cavity are configured in a manner including one atop the other or one alongside the other. A third plug receiving cavity may be included, wherein the first, second, and third plug receiving cavity are configured in a manner including one atop the other. The first plug receiving cavity is preferably associated with an RJ-45 plug type and the second and third plug receiving cavity are associated with a USB A plug type.  
           [0017]    Alternatively, the first, second, and third plug receiving cavities may be associated in a number of combinations, e.g. the first plug receiving cavity may be associated with an RJ-45 plug type and the second and third plug receiving cavity may be associated with a USB B plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB A plug type, and the third plug receiving cavity may be associated with a USB B plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB A plug type, and the third plug receiving cavity may be associated with an RJ-11 plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type, the second plug receiving cavity may be associated with a USB B plug type, and the third plug receiving cavity may be associated with an RJ-11 plug type; or the first plug receiving cavity may be associated with an RJ-45 plug type and the second and third plug receiving cavity may be associated with a RJ-11 plug type.  
           [0018]    It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention and together with the general description, serve to explain the principles of the invention. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWING  
       [0019]    The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures in which:  
         [0020]    [0020]FIG. 1 is a diagram illustrating a conventional connector area on an exemplary motherboard and several conventional single plug connectors;  
         [0021]    [0021]FIG. 2 is a diagram illustrating a conventional connector area on an exemplary motherboard, several conventional single plug connectors, and stacked connectors in accordance with various exemplary embodiments of the present invention;  
         [0022]    [0022]FIG. 3 is a diagram illustrating an exemplary stacked connector with an improper plug type prevention mechanism in accordance with various exemplary embodiments of the present invention;  
         [0023]    [0023]FIG. 4 is a diagram illustrating an exemplary stacked connector with an improper plug type prevention mechanism in accordance with various exemplary alternative embodiments of the present invention;  
         [0024]    [0024]FIG. 5 is a diagram illustrating an exemplary stacked connector with an improper plug type prevention mechanism in accordance with various exemplary alternative embodiments of the present invention;  
         [0025]    [0025]FIG. 6 is a diagram illustrating an exemplary stacked connector with an improper plug type prevention mechanism in accordance with various exemplary alternative embodiments of the present invention;  
         [0026]    [0026]FIG. 7 is a diagram illustrating an exemplary stacked connector with an improper plug type prevention mechanism in accordance with various exemplary alternative embodiments of the present invention; and  
         [0027]    [0027]FIG. 8 is a diagram illustrating exemplary stacked connectors with 1×3 and 2×3 configurations in accordance with various alternative exemplary embodiments of the present invention 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0028]    In accordance with various exemplary embodiments, the present invention solves the problem of connector bay crowding and cross-plugging by combining several connector socket types in a stacked connector and by preventing the insertion of an improperly inserted plug. Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.  
         [0029]    As can be seen from FIG. 1, exemplary connector scenario  100  is shown including computer enclosure  101 . It should be noted that computer enclosure  101  is shown as, for example, a laptop enclosure, but can be an enclosure associated with any kind of computer or device. For example, computer enclosure  101  could be associated with a desktop computer, a laptop computer, a PDA, a handheld computer, or any kind of electronic device which makes use of external connectors. Computer enclosure  101  houses connector bay  102 , and motherboard  103 , and may further enclose components not shown such as, for example, a power supply, disk drives, and the like. Motherboard  103  may be configured to host several connector  104  of the same or different types including, RJ-11 connectors, RJ-45 connectors, parallel and/or serial “D” connectors, video connectors, USB connectors including A-type (large) and B-type (small), audio connectors, PS/2 connectors, and other proprietary and nonproprietary (e.g. standard) connectors. The connectors are generally mechanically fixed to motherboard  103  using any suitable conventional methods, with electrical connections being directly soldered to pads on motherboard  103 , or, as in the case of a desktop computer, may be associated with a peripheral plug-in card, though many standard connectors will be present as part of a basic system. In either case, space along connector bay  102  is limited by, for example, the number of slots and the square area generally associated with the back of computer enclosure  101 . It should be noted that an additional constraint on the amount of space available for connectors is the space required for air flow to cool, for example, the processor, the power supply, peripheral components, and the like. In some cases, connectors  104  may be mechanically coupled to connector bay  102  or computer enclosure  101  and wired to motherboard  101  using flexible wire, flex connectors, or the like. Regardless, space associated with connector bay  102  remains limited and as the number of connectors  104  supported increases, space along connector bay  102  becomes progressively scarce. It should further be noted that although typically associated with the back of computer enclosure  101 , exemplary stacked connectors in accordance with the present invention may be used anywhere on computer enclosure  101  for convenience, e.g. placing connectors similar in function together, or where space is limited including the front and sides of computer enclosure  101 .  
         [0030]    To address the problem of scarce space along connector bay  102 , motherboard  103  may be configured with connectors in accordance with exemplary connector scenario  200  as shown in FIG. 2. Computer enclosure  101  may be configured with connector bay  102  as before, however motherboard  103  now is equipped with stacking connectors  201  for space conservation. It should be noted that although stacking connectors  201  are illustrated including two stacked connectors in accordance with an exemplary preferred embodiment of the present invention, three or more connectors may also be stacked. It can further be seen that stacking connectors  201  may include combinations of several jack or socket types such as exemplary connector  202  which is shown including RJ-11 and RJ45 jack types, and exemplary connector  203  which is shown including USB B (small) form factor jack type and RJ-45 jack type. Although the combinations shown are useful, one skilled in the art will appreciate that other combinations are also useful such as a stacked connector including USB A (large) and B (small) form factor jack types and the like. It should further be noted that while the figures show the USB B (small) form factor jack for illustrative purposes, the USB A (large) form factor jack is preferred but is not illustrated since well understood. Further, it will be appreciated that although the stacked configuration shows one jack generally atop the other jack, the stacked connector of the present invention in alternative exemplary embodiments may include side by side stacking coupled with a one atop the other configuration, e.g. a 2-by-N configuration or an N-by-N configuration where N is the number of jack types. It should also be appreciated by one of skill in the art that in the preferred the stacked configuration of the present invention preferably includes a improper plug preventing jack stacked with any one or more of: RJ-11 connector, RJ-12 connector, RJ-45 connector (with or without plug prevention and/or detection), network connectors, fiber optic connectors, RG-type coaxial connectors, USB connectors, PS/2 connectors, D type serial connectors, audio connectors including RCA-mini and the like, video connectors, PS/2 connectors, and any other proprietary and/or nonproprietary (e.g. standard) connectors that would be known to one of ordinary skill.  
         [0031]    In addition to the problem of crowding, cross plugging problems are present and may lead to damage to equipment due to resulting improper cross-connections between, for example, voltage pins, ground pins, and data or signal pins. To alleviate the problem of potential electrical damage to equipment, exemplary stacked connector  300  is shown in FIG. 3 with exemplary USB B jack  301  and exemplary mechanism  310  for preventing the insertion of RJ-11 plug therein. It should be noted that such a mechanism is described in U.S. Pat. No. 6,458,001 B1 issued on Oct. 1, 2002 to Chen et al. Although Chen et al. adequately describe the construction of the prevention mechanism, Chen et al. fail to describe its use in a stacked connector arrangement. Another problem which occurs is the cross-pluggability problem which arises when a user improperly attempts to insert an RJ-11 plug into an RJ-45 jacks, or vice versa. This problem is described in greater detail, and a solution is provided, in the U.S. patent application filed on even date herewith and assigned to the same assignee of the present application entitled “RJ-45 Jack with RJ-11 Detection”, by Liebenow, Attorney docket no. P1915US00, the entire contents of which are hereby incorporated by reference in their entirety. In accordance with the mechanism described in Chen et al., and further in accordance with the stacked connector of the present invention, if an attempt is made to insert an improper RJ-11 plug into plug receiving cavity  314 , blocking finger  311  of blocking tab  312  will prevent insertion thereof. Blocking tab  312  may be configured with a resilient curved portion and blocking finger  311  extending into an upper narrow portion of plug receiving cavity  314 . Blocking finger  311  may be upwardly movable when the curved portion is pushed. Thus if a proper RJ-45 plug is inserted into plug receiving cavity  314 , the body of the RJ-45 plug will contact the resilient curvate spring bias portion of blocking tab  312  pushing it along with blocking fingers  311  up and out of the way allowing full insertion thereof. It will be appreciated by one of ordinary skill in the art that although in the illustrated exemplary embodiment, mechanism  310  is shown as a housing, blocking tabs  312  may be easily incorporated into a molded receptacle as, for example, a resilient curved portion. It will further be appreciated that only one half of mechanism  310  is shown, e.g. blocking tabs  312  include a tab on each side of plug receiving cavity  314  with associated blocking fingers  311 .  
         [0032]    Another exemplary stacked connector in accordance with various exemplary alternative embodiments of the present invention is illustrated in FIG. 4. Therein, stacked connector  400  is shown with exemplary USB B jack  301  and exemplary mechanism  410  for preventing insertion of an RJ-11 connector therewithin. It should be noted that such a mechanism is described in U.S. Pat. No. 6,296,528 B1 issued on Oct. 2, 2001 to Roberts et al. Although Roberts et al. describe a prevention mechanism, Roberts et al. fail to describe its use in a stacked connector arrangement. In accordance with the mechanism described in Roberts et al., and further in accordance with the stacked connector of the present invention, blocking arm  413  may be connected to the back of plug receiving cavity  414  and may be spring biased and normally positioned, as shown, in the blocking position. It should be noted that sliding actuator surface  411  begins at a distal free end of a flexible cantilevered arm having a free end located adjacent to a front wall of the stacked connector housing. The flexible cantilevered arm may be positioned a lateral distance from a width centerline of plug receiving cavity  414  such that sliding actuator surface  411  will contact a leading surface associated with the proper plug type at a predetermined distance from the width centerline less than one half the proper plug width dimension and greater than one half the improper plug width dimension. Accordingly, sliding actuator surface  411  slidably contacts the leading surface associated with the proper plug type as the proper plug type is inserted into plug receiving cavity  414  causing the flexible cantilevered arm to bend such that stop surface  412  is moved out of the way and thus out of engagement with the leading surface of the proper plug type. Complete insertion thereof into plug receiving cavity  414  is thereby allowed. If an attempt is made to insert an improper RJ-11 plug into plug receiving cavity  414 , the plug body will not contact sliding actuator surface  411  and consequently will be blocked by stop surface  412 . Again, however, if a proper RJ-45 plug is inserted into plug receiving cavity  414 , the body of the RJ-45 plug will contact sliding actuator surface  411  pushing it along with stop surface  412  up and out of the way allowing full insertion thereof. It will be appreciated by one of ordinary skill in the art that although in the illustrated exemplary embodiment, mechanism  410  is shown incorporated into a molded receptacle, it may be incorporated into a housing and configured to protrude through a molded receptacle or the like.  
         [0033]    Another exemplary stacked connector in accordance with various exemplary alternative embodiments of the present invention is illustrated in FIG. 5. Therein, stacked connector  500  is shown with exemplary USB B jack  301  and exemplary mechanism  510  for preventing insertion of an RJ-11 connector therewithin. It should be noted that such a mechanism is described in U.S. Pat. No. 6,350,156 B1 issued on Feb. 26, 2002 to Hasircoglu et al. Although Hasircoglu et al. describe a prevention mechanism, Hasircoglu et al. fail to describe its use in a stacked connector arrangement. In accordance with the mechanism described in Hasircoglu et al., and further in accordance with the stacked connector of the present invention, deflection member  513  may be positioned within plug receiving cavity  514  such that ramp surface  511  is positioned to contact a properly inserted RJ-45 plug. Deflection member  513  may be formed of a metal sheet material and may have a retention section for mounting within, for example, a molded housing or the like and may further include ramp surface  511  as noted, and blocking or stopping tab  512 . It will be appreciated that the retention member may be mounted, for example, in a slot in the housing, with ramp surface  511  extending into plug receiving cavity  514  so as to be able to contact the proper plug type and blocking or stopping tab  512  may extend laterally from ramp surface  511  further into plug receiving cavity  514  so as to contact and stop the insertion of the improper plug type. Accordingly, when the proper plug type is inserted into plug receiving cavity  514 , ramp surface  511  is engaged and the blocking or stopping tab  512  deflects away from the proper plug type thereby allows insertion into plug receiving cavity  514 . As described, the improper plug type will not contact ramp surface  511  and thus is stopped by blocking or stopping tab  512 , preventing insertion thereof. More specifically, deflection member  513  may be spring biased and normally positioned, as shown, in the blocking position such that blocking or stopping tab  512  is positioned to prevent RJ-11 insertion. If an attempt is made to insert an improper RJ-11 plug into plug receiving cavity  514 , the plug body will not contact ramp surface  511 , will not push up on deflection member  513 , and consequently will be blocked by blocking or stopping tab  512 . If however, a proper RJ-45 plug is inserted into plug receiving cavity  514 , the body of the RJ-45 plug will contact ramp surface  511  pushing it along with blocking or stopping tab  512  up and out of the way allowing full insertion thereof. It will be appreciated by one of ordinary skill in the art that although in the illustrated exemplary embodiment, mechanism  510  is shown separately attached into molded stacked connector  500 , it may be incorporated during fabrication into the molded receptacle itself. It should further be noted that although the view illustrated in FIG. 5 allows only one side of the mechanism of the present invention to be seen, a complimentary portion of the mechanism is preferably present on the other side of plug receiving cavity  514 .  
         [0034]    Still another exemplary stacked connector in accordance with various exemplary alternative embodiments of the present invention is illustrated in FIG. 6. Therein, stacked connector  600  is shown with exemplary USB B jack  301  and exemplary mechanism  610  for preventing insertion of an RJ- 11  connector therewithin. It should be noted that such a mechanism is described in U.S. Pat. No. 6,312,293 B1 issued on Nov. 6, 2001 to Wang. Although Wang describes a prevention mechanism, Wang fails to describe its use in a stacked connector arrangement. In accordance with the mechanism described in Wang, and further in accordance with the stacked connector of the present invention, resilient arm also described as connecting arm  613  may include a base portion and may be positioned within plug receiving cavity  614  such that surface  611  of connecting arm  613  is positioned to contact a properly inserted RJ-45 plug. The housing may include a slot defined in an opposite side wall for receiving the base portion and for fixing the prevention mechanism, e.g. the base, resilient or connecting arm  613 , and baffle  612 , to the housing. Connecting arm  613  may be resilient, e.g. spring biased, and normally positioned, as shown, in the blocking position such that baffles  612  are positioned to prevent RJ-11 insertion. If an attempt is made to insert an improper RJ-11 plug into plug receiving cavity  614 , the plug body will not contact surface  611 , will not push on connecting arm  613 , and consequently will be blocked by baffles  612 . If however, a proper RJ-45 plug is inserted into plug receiving cavity  614 , the body of the RJ-45 plug will contact surface  611  pushing it along with baffles  612  out of the way allowing full insertion thereof. It will be appreciated by one of ordinary skill in the art that although in the illustrated exemplary embodiment, mechanism  610  is shown separately attached onto, for example, a housing associated with molded stacked connector  600 , it may be incorporated during fabrication into the molded receptacle itself or attached as a separate set of spring elements. It should further be noted that although the view illustrated in FIG. 6 allows only one side of the mechanism of the present invention to be seen, a complimentary portion of the mechanism is preferably present on the other side of plug receiving cavity  614 .  
         [0035]    Still another exemplary stacked connector in accordance with various exemplary alternative embodiments of the present invention is illustrated in FIG. 7. Therein, stacked connector  700  is shown with exemplary USB B jack  301  and exemplary mechanism  710  for preventing insertion of an RJ-11 connector therewithin. It should be noted that such a mechanism is described in U.S. Pat. No. 6,257,935 B1 issued on Jul. 10, 2001 to Zhang et al. Although Zhang et al. describe a prevention mechanism, Zhang et al. fail to describe its use in a stacked connector arrangement. In accordance with the mechanism described in Zhang et al., and further in accordance with the stacked connector of the present invention, stem  713  may be positioned within plug receiving cavity  714  such that flared free end  711  of stem  713  is positioned to contact a properly inserted RJ-45 plug. Flared free end  711  may include a curved force receiving portion, stop tongue  712 , and a base portion, and may extend from resilient stem  713  into a channel defined in an upper wall of the housing. It should be noted that the curved force receiving portion associated with flared free end  711  projects a shorter distance from the corresponding side wall into plug receiving cavity  714  than stop tongue  712  projects from the corresponding side wall into the channel. Stem  713  may be spring biased and normally positioned, as shown, in the blocking position such that linear stop face of stop tongue  712  are positioned to prevent RJ-11 insertion. If an attempt is made to insert an improper RJ-11 plug into plug receiving cavity  714 , the plug body will not contact flared free end  711 , will not push on stem  713 , and consequently will be blocked by the linear stop face of stop tongue  712 . If however, a proper RJ-45 plug is inserted into plug receiving cavity  714 , the body of the RJ-45 plug will contact flared free end  711  pushing it along with stop tongue  712  out of the way allowing full insertion thereof. It will be appreciated by one of ordinary skill in the art that although in the illustrated exemplary embodiment, mechanism  710  is shown separately attached onto, for example, a housing associated with molded stacked connector  700 , it may be incorporated during fabrication into the molded receptacle itself or attached as a separate set of spring elements. It should further be noted that although the view illustrated in FIG. 7 allows only one side of the mechanism of the present invention to be seen, a complimentary portion of the mechanism is preferably present on the other side of plug receiving cavity  714 .  
         [0036]    As previously described, the stacked connector of the present invention is not limited to a 1×2 configuration as has been shown for illustrative purposes, but can include up to N×N stacked connectors. It will be appreciated that the actual numbers of connectors in the stack will have practical limits however, N may include a number as great as three or even greater. FIG. 8 shows exemplary connector scenario  800  where exemplary stacked connector  801  having a 1×3 configuration is shown along side exemplary stacked connector  203  having a preferred 1×2 configuration. In accordance with still another alternative exemplary embodiment of the present invention, exemplary stacked connector  802  is shown having a 2×3 configuration.  
         [0037]    In addition to the previously described plug prevention mechanisms, it will be appreciated by those skilled in the art that in accordance with various alternative exemplary embodiments, plug detection mechanisms, as described, for example, in the above-identified application to the present assignee, Gateway, Inc., entitled “RJ-45 Jack with RJ-11 Detection”, by Liebenow, Attorney docket no. P1915US00, may also be combined in the stacked connector configuration of the present invention to provide detection and, for example, notification through a software interface or the like of improper plug type insertion.  
         [0038]    It is believed that the stacked connector of the present invention and many of its attendant advantages will be understood by the forgoing description. It is also believed that it will be apparent that various changes may be made in the form, construction and arrangement of the components thereof without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely an explanatory embodiment thereof. It is the intention of the following claims to encompass and include such changes.