Abstract:
A cable television (CATV) entry adapter interfaces to a CATV network and serves as a hub in a Multimedia over Coax Alliance (MoCA) network. MoCA signals are bypassed around the CATV communication paths within the entry adapter to maintain adequate signal strength and to allow a passive port of the entry adapter to be used as part of the MoCA network. MoCA signals are suppressed from exiting the CATV entry adapter onto the CATV network.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This invention incorporates herein by this reference, the subject matter of co-pending U.S. patent application Ser. No. 12/250,229, filed Oct. 13, 2008, titled Ingress Noise Inhibiting Network Interface Device and Method for Cable Television Networks, which is assigned to the assignee hereof. 
     FIELD OF THE INVENTION 
     This invention relates to cable television (CATV) networks and to Multimedia over Coax Alliance (MoCA) in-home entertainment networks. More particularly, the present invention relates to a new and improved interface between a CATV network and a MoCA network which maintains the privacy of MoCA data at the premises of one CATV subscriber or customer and prevents the MoCA data reaching premises of another CATV subscriber and/or interfering with the MoCA network functionality at the other premises, which allows all active and passive taps or connectors of a multi-tap CATV entry adapter to conduct the MoCA signals in the MoCA network, and which allows the multi-tap CATV entry adapter to be fully functional as a hub in the MoCA network within the subscriber premises, among other improvements. 
     BACKGROUND OF THE INVENTION 
     CATV networks use an infrastructure of interconnected coaxial cables, signal splitters and combiners, repeating amplifiers, filters, trunk lines, cable taps, drop lines and other signal-conducting devices to supply and distribute high frequency “downstream” signals from a main signal distribution facility, known as a “headend,” to the premises (homes and offices) of subscribers to the CATV services. The downstream signals operate subscriber equipment, such as television sets, telephone sets and computers. In addition, most CATV networks also transmit “upstream” signals from the subscriber equipment back to the headend of the CATV network. For example, the subscriber uses a set top box to select programs for display on the television set. As another example, two-way communication is essential when using a personal computer connected through the CATV infrastructure to the public Internet. As a further example, voice over Internet protocol (VOIP) telephone sets use the CATV infrastructure and the public Internet as the communication medium for transmitting two-way telephone conversations. 
     To permit simultaneous communication of upstream and downstream CATV signals and the interoperability of the subscriber equipment and the equipment associated with the CATV network infrastructure outside of subscriber premises, the downstream and upstream signals are confined to two different frequency bands. The downstream frequency band is within the range of 54-1002 megahertz (MHz) and the upstream frequency band is within the range of 5-42 MHz, in most CATV networks. 
     The downstream signals are delivered from the CATV network infrastructure to the subscriber premises at an entry device, which is also commonly referred to as an entry adapter, terminal adapter or a drop amplifier. The entry device is usually a multi-port device which provides a multiplicity of ports or connectors for connecting coaxial cables. A separate coaxial cable is connected to each of the ports and extends within the subscriber premises to the location of the subscriber equipment. Typically, most homes have coaxial cables extending to cable outlets in almost every room, because different types of subscriber equipment may be used in different rooms. For example, television sets and computers may be present in many different rooms. One or more telephone sets are also commonplace in a home. The multiple ports on the entry device accommodate connections to the subscriber equipment so that the downstream signals are received at each cable outlet and upstream signals are conducted back through the premises coaxial cables to the entry device and from there as upstream signals on the CATV network. 
     In addition to television sets, computers and telephones, a relatively large number of other entertainment and multimedia devices are available for use in homes. For example, a digital video recorder (DVR) is used to record broadcast programming, still photography and moving pictures in a memory medium so that the content can be replayed on a display or television set at a later time selected by the user. As another example, computer games are also played at displays or on television sets. Such computer games may be those obtained over the Internet from the CATV network or from media played on play-back devices connected to displays or television sets. As a further example, receivers which receive satellite-broadcast signals may be distributed for viewing or listening throughout the home. These types of devices, including the more-conventional television sets, telephone sets and devices connected to the Internet by the CATV network, are generically referred to as multimedia devices. 
     The desire to use multimedia devices at multiple different locations within the home or subscriber premises has led to the creation of the Multimedia over Coax Alliance (MoCA). MoCA has developed specifications for products to create an in-home entertainment network for interconnecting presently-known and future multimedia devices. The MoCA in-home network uses the subscriber premise or in-home coaxial cable infrastructure originally established for distribution of CATV signals within the subscriber premises, principally because that cable infrastructure already exists in most homes and is capable of carrying much more information than is carried in the CATV frequency bands. A MoCA network is established by connecting MoCA interface devices at the cable outlets in the rooms of the subscriber premises. The MoCA interface devices implement a MoCA communication protocol which encapsulates the signals normally used by the multimedia devices within MoCA signals and then communicate these MoCA signals between selected ones of the other MoCA interfaces devices connected at other cable outlets. The receiving MoCA interface device removes the encapsulated multimedia device signals, and delivers those to the connected display, computer or other multimedia device from which the content is presented. 
     Each MoCA interface device is capable of communicating with every other MoCA interface device in the MoCA network to deliver the multimedia content throughout the home or subscriber premises. The entertainment or multimedia content that is available from one multimedia device can be displayed, played or otherwise used at a different location within the home, without having to physically relocate the multimedia device from one location to another within the home. The in-home network communication of multimedia content is considered beneficial in more fully utilizing the multimedia devices present in modern homes. 
     Since the MoCA network may function simultaneously with the normal operation of the CATV services, the MoCA signals communicated between MoCA interface devices utilize a frequency range of 1125-1525 MHz. This so-called D band of MoCA signals is divided into eight different frequency ranges, D1-D8, and these eight different D frequency ranges are used to assure communication between the selected MoCA interface devices. For example, the D-1 band at 1125-1175 MHz may be used to communicate CATV television programming content between a MoCA interface device connected to a set-top box in a main room of the house and another MoCA interface device connected to a television set in bedroom of the house, while a MoCA interface device connected to a computer gaming multimedia device in a basement room of the house simultaneously communicates computer game content over the D-6 band at 1375-1425 MHz to a computer located in a recreation room of the house. The MoCA frequency band also includes other frequency ranges, but the D band is of the major relevance because of its principal use in establishing connections between the MoCA interface devices. 
     Although using the in-home coaxial cable as the principal communication medium substantially simplifies the implementation of the MoCA network, there are certain disadvantages to doing so. The D band MoCA frequencies have the capability of passing through the CATV entry device and entering the CATV network where they may then pass through a cable drop and enter an adjoining subscriber&#39;s premises. The presence of the MoCA signals at an adjoining subscriber&#39;s premises compromises the privacy and security of the information originally intended to be confined only within the original subscriber premises. The MoCA signals from the original subscriber premises which enter through the CATV network to adjoining subscriber premises also have the potential to adversely affect the performance of a MoCA network in the adjoining subscriber premises. The conflict of the signals from the original and adjoining subscriber premises may cause the MoCA interface devices to malfunction or not operate properly on a consistent basis. 
     CATV networks are subject to adverse influences from so-called ingress noise which enters the CATV network from external sources, many of which are located at the subscriber premises. The typical range of ingress noise is in the frequency band of 0-15 MHz, but can also exist in other upstream or downstream frequencies. Ingress noise mitigation devices have been developed to suppress or reduce ingress noise from the subscriber premises before it enters the CATV network. The D bands in the MoCA frequency range are considerably outside the range of the normal ingress noise, and ingress noise suppression devices are ineffectual in inhibiting MoCA signals. MoCA signals, being outside of the CATV signal frequency, may also constitute another source of noise for the CATV network. Separate MoCA frequency rejection filters have been developed for external connection to CATV entry adapters. However, the use of such devices is subject to unauthorized removal, tampering, forgetfulness in original installation, and physical exposure which could lead to premature failure or malfunction. 
     Problems also arise because the CATV network and the in-home cable infrastructure were originally intended for the distribution of CATV signals to the cable outlets. The typical in-home cable infrastructure uses signal splitters to divide a single downstream signal into multiple downstream signals and to combine multiple upstream signals into a single upstream signal or band. Distribution of the CATV signals to and from the cable outlets occurs in this manner. The CATV cable infrastructure was not intended for communication between cable outlets, but to implement the MoCA communication protocol, the MoCA signals must traverse between the multiple cable outlets by communication through each splitter in a traversal process referred to as “splitter jumping.” 
     The typical signal splitter has a high degree of signal rejection or isolation between its multiple output ports. When the MoCA signals jump the output ports of a splitter, the degree of signal rejection or isolation greatly diminishes the strength of the signals which effectively jump the output ports. The physical signal communication paths between the cable outlets is also highly variable because of the differences in the in-home cable infrastructure in most homes. The MoCA communication protocol recognizes the possibility of variable strength signals, and provides a facility to boost the strength of MoCA signals under certain circumstances. However, the substantial differences in the in-home cable infrastructure may nevertheless negatively impact the strength of the MoCA signals conducted. 
     One example of significant negative impact on MoCA signals arises from passive-active CATV entry adapters. Passive-active CATV entry adapters supply both passive CATV signals and amplified or active CATV signals at the subscriber premises for delivery to passive and active types of CATV subscriber equipment, respectively. Passive-active entry adapters include a splitter which essentially divides or branches the downstream signals from the CATV network into passive signals and into active signals. The passive signals are conducted through the entry adapter without amplification, conditioning or modification before they are delivered from a passive port to passive subscriber equipment, typically a voice modem of a “life-line” telephone set. Because life-line telephone services are intended to remain useful in emergency conditions, the functionality of the telephone set can not depend on the proper functionality of an amplifier or other active signal conditioner in the signal path. The active signals are conducted through a forward path amplifier, where the amplifier amplifies the strength of the signals or modifies or conditions some characteristic of the signals before delivery from active ports to active subscriber equipment. Because most subscriber equipment benefits from amplified signals, the majority of ports on a CATV entry adapter are active ports. Usually only one passive port is provided for each entry adapter. 
     In those situations where a CATV subscriber does not utilize the passive port for passive equipment, active equipment may be connected to the passive port and that active equipment may function properly if the strength of the signal from the passive port is sufficient. In other cases, the passive port simply may not be connected, and only the active ports of the CATV entry adapter are used. 
     Any attempt to connect the passive port as part of a MoCA network will not be successful, however, because the MoCA signals are severely diminished in signal strength when they pass from the active ports in a reverse direction through the forward path amplifier. The MoCA signals must pass in a reverse direction through the forward path amplifier to reach the splitter of the CATV entry adapter before the MoCA signals can jump the splitter and reach the passive port. Signal conductivity in the reverse direction through a forward path amplifier is simply not possible without severe attenuation. Thus, it is essentially impossible to use a passive port on a CATV entry adapter for connection in a MoCA network, because of inadequate MoCA signal strength. The level of attenuation is greater than can be overcome by adjusting the boost of the MoCA signals in accordance with the MoCA communication protocol. 
     SUMMARY OF THE INVENTION 
     The present invention is for a CATV entry adapter which beneficially contributes to the establishment of a MoCA in-home network. The CATV entry adapter of the present invention effectively permits its passive port, if unused by passive subscriber equipment, to be fully utilized and fully effective in a MoCA network without substantial MoCA signal degradation caused by reverse transfer through a forward signal amplifier. The forward signal amplification capability is retained for CATV signals, but is bypassed for MoCA signals in the D frequency band. Consequently, a single CATV entry adapter can be more effectively used as a hub for a MoCA network by allowing passive equipment to be connected to the passive port when used, and by allowing the passive port to be used as part of the MoCA network rather than requiring the use of a larger or different CATV entry adapter with more active ports. The present CATV entry adapter also prevents or greatly inhibits MoCA signals from exiting the MoCA network at the subscriber premises and entering the CATV network. By confining the MoCA signals to the MoCA network at the subscriber premises, the privacy and security of the information carried by the MoCA signals is not compromised, and spurious MoCA signals from one subscriber premises are not available over the CATV network to interfere with MoCA network established at another subscriber premises connected to the CATV network. The ability to prevent or inhibit the MoCA signals from entering the CATV network is an internal function of the CATV entry adapter which thereby shields that functionality from unauthorized removal, tampering, forgetfulness in original installation, and physical exposure. The rejection of the MoCA signals from entry onto the CATV network is better assured. 
     In accordance with these aspects, one summary of the invention is as follows. A cable television (CATV) entry adapter has an entry port and a passive port and a plurality of active ports by which to interface a CATV network connected at the entry port with subscriber equipment at subscriber premises connected at the active ports. The CATV entry adapter also functions as a hub in a Multimedia over Coax Alliance (MoCA) network to communicate MoCA signals between MoCA interface devices connected to the active and passive ports. The CATV entry device comprises a CATV passive signal communication path which conducts CATV signals between the passive port and the entry port, a CATV active downstream communication path which conducts CATV downstream signals between the entry port and the active ports, a CATV active upstream communication path which conducts CATV upstream signals between the active ports and the entry port, and a MoCA signal communication path which conducts MoCA signals around the CATV active downstream and upstream communication paths when communicating the MoCA signals from the MoCA interface devices at the active ports to each MoCA device connected to a passive port. The CATV entry adapter may also include a MoCA signal frequency rejection filter connected at the entry port to suppress the conduction of MoCA signals onto the CATV network. 
     Further in accordance with the above aspects, another summary of the invention is as follows. A method of using a cable television (CATV) entry adapter has a plurality of ports to interface CATV upstream signals and CATV downstream signals supplied from a CATV network with subscriber equipment at subscriber premises while simultaneously functioning as a hub in a Multimedia over Coax Alliance (MoCA) network. The MoCA network communicates MoCA signals between MoCA interface devices connected to multimedia devices. At least some of the multimedia devices include the subscriber equipment. The method comprises conducting CATV signals to and from the CATV entry adapter at an entry of one of the ports, conducting CATV passive signals from the CATV network in a CATV passive signal communication path through the CATV entry adapter to a passive one of the ports, conducting CATV downstream signals from the CATV network in a CATV active downstream signal communication path through the CATV entry adapter to a plurality of active ones of the ports, conducting CATV active upstream signals from the plurality of active ports in a CATV active upstream communication path through the CATV entry adapter to the port, conducting MoCA signals from the plurality of active ports in a MoCA signal communication path which bypasses the CATV active downstream and upstream communication paths through the CATV entry adapter to the passive port, and connecting MoCA interface devices to the passive port and at least one of the active ports. The method may also include preventing the conduction of MoCA signals from within the CATV entry device onto the entry port and the CATV network. 
     By bypassing MoCA signals around the CATV active downstream signal communication paths and the CATV active upstream signal communication paths, passive port is also available to be used as part of the MoCA network, provided that passive subscriber equipment is not connected to the passive port. Use of the passive port is possible because the MoCA signals are not attenuated as would occur if the MoCA signals were passed through either of the CATV signal communication paths. By preventing the MoCA signals from passing from the CATV entry adapter to the CATV network, the privacy and security of the information communicated with in one MoCA network is not compromised by inadvertent transfer to another MoCA network in an adjacent subscriber premises. Confining all of the components and functionality within a housing of the CATV entry adapter greatly facilitates its use. 
     Other and different statements and aspects of the invention appear in the following claims. A more complete appreciation of the present invention, as well as the manner in which the present invention achieves the above and other improvements, can be obtained by reference to the following detailed description of a presently preferred embodiment taken in connection with the accompanying drawings, which are briefly summarized below, and by reference to the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a plurality of CATV entry adapters which incorporate the present invention, shown interconnecting a CATV network and a plurality of MoCA in-home networks each located at subscriber premises. 
         FIG. 2  is a generalized perspective view of one CATV entry adapter shown in  FIG. 1 , connected to the MoCA network in one subscriber premises, with more details of the MoCA network and active and passive subscriber equipment connected to the CATV entry adapter shown in block diagram form. 
         FIG. 3  is a block diagram of functional components of the CATV entry adapter shown in  FIG. 2 , shown connected to the CATV network, and also showing components forming nodes of the MoCA network. 
         FIG. 4  is a block diagram similar to  FIG. 3 , illustrating the connection of additional MoCA nodes of the MoCA network to a passive port of the CATV entry adapter. 
         FIG. 5  is a block diagram similar to  FIG. 3 , illustrating a different connection of a MoCA signal communications path than that shown in  FIG. 3 . 
     
    
    
     DETAILED DESCRIPTION 
     A CATV entry adapter  10  which incorporates the present invention is shown generally in  FIG. 1 . The CATV entry adapter  10  is located at subscriber premises  12  and forms a part of a conventional MoCA in-home entertainment network  14 . Multimedia devices  16  are connected to the MoCA network  14  in the subscriber premises  12 . The multimedia devices  16  communicate multimedia content or MoCA signals between one another using the MoCA network  14  which is formed in part by the preexisting coaxial cable infrastructure (represented generally by coaxial cables  18 ) present in the subscriber premises  12 . Examples of multimedia devices  16  are digital video recorders, computers, data modems, computer game playing devices, television sets, television set-top boxes, and other audio and visual entertainment devices. 
     The CATV entry adapter  10  is also a part of a conventional CATV network  20 . The CATV entry adapter delivers CATV content or signals from the CATV network to subscriber equipment at the subscriber premises  12 . The subscriber equipment includes the multimedia devices  16 , but may also include other devices which do not operate as a part of the MoCA network  14  but which are intended to function as a result of connection to the CATV network  20 . Examples of subscriber equipment which are normally not part of the MoCA network  14  are voice modems and connected telephone sets. 
     The CATV entry adapter  10  has beneficial characteristics which allow it to function in multiple roles simultaneously in both the MoCA network  14  and in the CATV network  20 , thereby benefiting both the MoCA network  14  and the CATV network  20 . The CATV entry adapter  10  functions as a hub in the MoCA network  14 , to effectively transfer MoCA signals between the multimedia devices  16 , including those that might be connected to passive ports of the CATV entry adapter  10 , as will be described in greater detail below. The CATV entry adapter  10  also functions in a conventional role as an interface between the CATV network  20  and the subscriber equipment located at the subscriber premises, thereby facilitating CATV service to the subscriber. In addition, the CATV entry adapter  10  securely and privately confines MoCA network communications within each subscriber premise and to prevent the MoCA signals from entering the CATV network  20  and degrading the strength of the CATV signals conducted by the CATV network. These and other improvements and functions are described in greater detail below. 
     The CATV network  20  shown in  FIG. 1  has having a typical topology. Downstream signals  22  originate from programming sources at a headend  24  of the CATV network  20 , and are conducted to the CATV entry adapter  10  in a sequential path through a main trunk cable  26 , a signal splitter/combiner  28 , secondary trunk cables  30 , another signal splitter/combiner  32 , distribution cable branches  34 , cable taps  36 , and drop cables  38 . Upstream signals  40  are delivered from the CATV entry adapter  10  to the CATV network  20 , and are conducted to the headend  24  in a reverse sequential path. Interspersed at appropriate locations within the topology of the CATV network  20  are conventional repeater amplifiers  42 , which amplify both the downstream signals  22  and the upstream signals  40 . Conventional repeater amplifiers may also be included in the cable taps  36 . The cable taps  36  and signal splitter/combiners  28  and  32  divide a single downstream signal into multiple separate downstream signals, and combine multiple upstream signals into a single upstream signal. 
     The CATV entry adapter  10  receives the downstream signals  22  from the CATV network  20  at a CATV network entry or connection port  44 . The downstream signals  22  are either passive or active. Passive downstream signals are those signals which are conducted through the CATV entry adapter  10  without amplification, enhancement, modification or other substantial conditioning. The passive downstream signals are delivered from a passive port  45  to passive subscriber equipment, such as a voice modem  46  connected to a telephone set  48  (shown connected to only one CATV entry adapter  10  in  FIG. 1 ). Active downstream signals are those signals which are amplified, filtered, modified, enhanced or otherwise conditioned by power-consuming active electronic circuit components within the CATV entry adapter  10 , such as an amplifier for example. The conditioned active downstream signals are divided into multiple copies and delivered from a plurality of active ports (collectively referenced at  49  in  FIG. 1 , but individually referenced at  50 ,  52 ,  54  and  56  in  FIG. 2 ) to subscriber equipment located at the subscriber premises  12 . 
     The CATV subscriber equipment typically generates upstream signals  40  ( FIG. 2 ) and delivers them to the CATV entry adapter  10  for delivery to the CATV network  20 . The upstream signals  40  may be passive upstream signals generated by passive subscriber equipment, exemplified by the voice modem  46  and the telephone set  48 , or the upstream signals  40  may be active upstream signals generated by active subscriber equipment exemplified by set-top boxes connected to television sets (neither shown). Set top boxes allow the subscriber/viewer to make programming and viewing selections. 
     More details concerning the CATV entry device are shown in  FIG. 2 . The CATV entry adapter  10  includes a housing  58  which encloses internal electronic circuit components (shown in  FIGS. 3 and 4 ). A mounting flange  60  surrounds the housing  58  and holes  62  in the flange  60  allow attachment of the CATV entry adapter  10  to a support structure at a subscriber premises  12 . Electrical power for the CATV entry adapter  10  is supplied from a conventional DC power supply  66  connected to a dedicated power input port  68 . Alternatively, electrical power can be supplied through a conventional power inserter (not shown) that is connected to one of the active ports  50 ,  52 ,  54  or  56 . The power inserter allows relatively low voltage DC power to be conducted through the same active port that also conducts high-frequency signals. Use of a conventional power inserter eliminates the need for a separate dedicated power supply port  68 , or provides an alternative port through which electrical power can also be applied. The power supply  66  or the power supplied from the power inserter is typically derived from a conventional wall outlet (not shown) within the subscriber premises  12 . The CATV network  20  is connected to the CATV network entry port  44  of the CATV entry adapter  10 . 
     The ports  44 ,  45 ,  50 ,  52 ,  54 ,  56  and  68  are each preferably formed by a conventional female coaxial cable connector which is mechanically connected to the housing  58  and which is electrically connected to internal components of the CATV entry adapter  10 . Coaxial cables  18  from the subscriber premises cable infrastructure and the drop cables  38  ( FIG. 1 ) are connected to the CATV entry adapter  10  by mechanically connecting the corresponding mating male coaxial cable connector (not shown) on these coaxial cables to the female coaxial cable connectors forming the ports  44 ,  45 ,  50 ,  52 ,  54 ,  56  and  68 . 
     One CATV entry adapter  10  is located at each subscriber premises. The number of active and passive ports  45 ,  50 ,  52 ,  54  and  56  is dictated by the number of coaxial cables  18  which are routed throughout the subscriber premises. Although the CATV entry adapter  10  shown in  FIG. 2  includes seven ports, other entry adapters have a larger number of ports. The number and routing of the coaxial cables  18  within the subscriber premises constitute the in-home or subscriber premise cable infrastructure that each used by the MoCA network  14  ( FIG. 1 ). 
     Since the CATV service provider supplies the CATV entry adapter  10  for use by each subscriber, it is advantageous to reduce the number of different configurations of CATV entry adapters. Doing so offers economies of scale in mass production, reduces the opportunity for errors in installation, allows the subscriber to expand and change the in-home cable infrastructure, and reduces inventory costs, among other things. The CATV entry adapter  10  also has the capability of functioning as a hub in the MoCA network  14  ( FIG. 1 ). With built-in hub capability as described below, and with the capability to use all of the available ports for connection to multimedia devices  16 , the CATV entry adapter  10  is more useful and economical to both the CATV service provider and the subscriber who wishes to implement a MoCA in-home entertainment network at his or her premises. 
     Each of the coaxial cables  18  of the in-home cable infrastructure terminates at a cable outlet  70 . Those coaxial cables  18  which are not currently in use are terminated with an appropriate termination resistor (not shown) located at the cable outlet  70  of these coaxial cable  18 . In most cases however, the cable outlet  70  of these coaxial cable  72  is connected to a MoCA interface device  72  where a multimedia device  16  is connected. 
     Each MoCA interface device  72  is a conventional item presently available for purchase and use. Each MoCA interface device  72  contains a controller which is programmed with the necessary functionality to implement the MoCA communication protocol. Each MoCA interface device  72  is connected between the cable outlet  70  and a multimedia device  16 . When the multimedia device  16  creates output signals, those output signals are encapsulated or otherwise embodied in MoCA signals created by the MoCA interface device  72 , and then those MoCA signals are communicated by one MoCA interface device  72  through the coaxial cables  18  of the in-home cable infrastructure, through the CATV entry adapter  10 , and to another MoCA interface device  72 . The other MoCA interface device  72  extracts the original output signals that were encapsulated or otherwise embodied in the MoCA signals and supplies those original output signals to the multimedia device  16  to which the MoCA interface device  72  is attached. In this manner, MoCA signals or multimedia content from one multimedia device  16  are/is communicated through the MoCA network  14  ( FIG. 1 ) to another multimedia device  16  for use at its location. Functioning in this manner, and in terms of the conventional terminology used in the field of networks, the MoCA interface device  72  and the multimedia device  16  form one node  74  of the MoCA network  14 . MoCA signals are therefore communicated between the different MoCA nodes  74  of the MoCA network  14 . 
     The internal functional components of the CATV entry adapter  10  are shown in  FIG. 3 . Those internal circuit components include a conventional bidirectional signal splitter/combiner  76  which separates the downstream signals  22  from the CATV network  20  at the entry port  44  into passive CATV downstream signals  78  and active CATV downstream signals  80 . The passive downstream signals  78  are conducted directly to and through the passive port  45  to the passive subscriber equipment  46  and  48 . Passive upstream signals  82  are created by the passive subscriber equipment  46  and  48  and are conducted through the passive port  45  directly through a CATV passive signal communication path  79  to the signal splitter/combiner  76  to become upstream signals  40  in the CATV network  20 . The direct CATV passive signal communication path  79  for the passive signals in the CATV entry adapter  10  contains no active electronic components that might fail or malfunction, thereby enhancing the reliability of CATV passive communications. The CATV passive communication path  79  is intended to be as reliable as possible since it may be used in emergency and critical circumstances. 
     The active CATV downstream signals  80  are conducted to a first CATV downstream frequency bandpass filter  84  in a CATV active downstream signal communication path  85 . The downstream filter  84  passes signals having frequencies in the CATV downstream frequency range of 54-1002 MHz, and rejects signals having frequencies in other ranges. The downstream signals passed by the filter  84  are amplified by an amplifier  86  and then supplied to a second CATV downstream frequency bandpass filter  88 , both of which are also part of the CATV active downstream signal communication path  85 . 
     The amplified and further filtered CATV downstream signals are then conducted to a first bidirectional splitter/combiner  90 , which splits or divides those signals into two identical CATV downstream signals. The two signals from the first splitter/combiner  90  are supplied as inputs to two other bidirectional splitters/combiners  92  and  94 , respectively, which are connected in cascade with the first splitter/combiner  90 . The splitters/combiners  92  and  94  again split or divide each of their two input signals into two identical CATV downstream signals. The four output signals from the cascade-connected splitters/combiners  90 ,  92  and  94  are applied at the active ports  50 ,  52 ,  54  and  56  of the CATV entry adapter  10 . Although for active ports  50 ,  52 ,  54  and  56  are shown, more active ports are achieved by use of more splitters/combiners connected in cascade. To the extent that the multimedia devices  16  connected through the coaxial cables  18  directly respond to the CATV downstream signals, each MoCA interface device  72  passes those downstream signals directly to the multimedia device  16 . The MoCA interface device  72  does not modify or otherwise influence the CATV downstream signals passing through it. 
     In those cases where the multimedia device  16  is capable of sending CATV upstream signals  96 , those signals  96  are likewise passed through the MoCA interface device  72  without change or influence and are then conducted through the cable outlet  70 , the coaxial cable  18  and the active ports  50 ,  52 ,  54  or  56  to the splitters/combiners  92  and  94 . The splitters/combiners  92  and  94  combine all CATV upstream signals  96  and supply those upstream signals to the splitter  90 . The splitter  90  combines the CATV upstream signals  96  from the splitters  92  and  94  and supplies them to a first CATV upstream frequency bandpass filter  98 , which forms a part of a CATV active upstream signal communication path  99 . The filter  98  passes signals having frequencies in the CATV upstream frequency range of 5-42 MHz, and rejects signals having frequencies in other ranges. The CATV upstream signals passed by the filter  84  are then preferably supplied to a ingress noise mitigation circuit  100 . The ingress noise mitigation circuit  100  suppresses ingress noise in the range of 0-5 MHz that may have originated from noise sources within the subscriber premises. The ingress noise mitigation circuit  100  is optional in the CATV entry adapter  10 , but if employed, is preferably employed in the form described in the co-pending U.S. patent application described above. The CATV upstream signals leaving the circuit  100  are then applied to a second CATV upstream frequency bandpass filter  102 . The ingress noise mitigation circuit  100  and the second CATV upstream bandpass filter  102  are part of the CATV active upstream signal communication path  99 . The filtered active upstream signals leaving the second filter  102  are supplied to the splitter/combiner  76 , and are conducted through the CATV entry port  44  to the CATV network  20 . 
     When the CATV entry adapter  10  is used as a hub in the MoCA network  14  ( FIG. 1 ), and passive subscriber equipment  46  and  48  is connected to the only passive port  45  of that entry adapter  10 , the MoCA network  14  exists only between and through the active ports  50 ,  52 ,  54  and  56 , as is shown in  FIG. 3 . MoCA signals from the MoCA interface devices  72  are communicated through the cable outlets  70 , the coaxial cables  18 , the active ports  50 ,  52 ,  54  and  56 , and the splitters/combiners  92 ,  94  and  90 . The MoCA signals traverse or jump between the outputs of the splitters/combiners. In this case, the splitters/combiners  90 ,  92  and  94  connect all of the coaxial cables  18  at a common location so that all the MoCA signals may be conducted between all of the MoCA interface devices  72 . 
     Whenever there is no life-line voice service connected to the passive port  45  of the CATV entry adapter  10 , the passive port  45  becomes available for use as part of the MoCA network  14 , as is shown in  FIG. 4 . In a situation shown in  FIG. 4 , a splitter/combiner  104  has been connected externally of the passive port  45  of the CATV entry adapter  10 . Consequently, the splitter/combiner  104  is not built-in or incorporated within the CATV entry adapter  10 , but instead, the splitter/combiner is part of the in-home cable infrastructure. Coaxial cables  18  connect to the splitter/combiner  104  and the cable outlets  70  of those coaxial cables connect to MoCA interface devices  72  which are connected to multimedia devices  16  in the manner previously described. 
     MoCA signals between the two MoCA interface devices  72  connected to the splitter  104  communicate with each other by traversing or jumping the splitter/combiner  104 . The MoCA signals generated by the two MoCA interface devices  72  are also be conducted to the splitter combiner  76  where those signals will jump or traverse it. However, there is no direct communication path from the splitter/combiner  76  through either the CATV active downstream signal communication path  85  through components  84 ,  86  and  88  or through the CATV active upstream signal communication path  99  through components  98 ,  100  and  102 . The components within the CATV upstream and downstream communication paths  85  and  99  severely attenuate the MoCA signals in the D channel frequency range, because the D channel signals are in the 1125-1525 MHz frequency range. The filters  84  and  86  in the CATV downstream communication path  85  and the filters  98  and  102  in the CATV upstream communication path  99  reject the D channel MoCA signals. Moreover, attempting to conduct the MoCA signals in the reverse direction through the amplifier  86  results in severe attenuation of those signals, if such conduction is even possible. A similar result applies when attempting to conduct MoCA signals through the ingress noise mitigation circuit  100 . 
     To permit the CATV entry device  10  to communicate MoCA signals  105  from the passive port  45  to the active ports  50 ,  52 ,  54  and  56 , a bidirectional MoCA frequency bandpass filter  106  is connected directly between the splitters/combiner  76  and  78 , in parallel with the CATV upstream and downstream paths. The bidirectional MoCA frequency bandpass filter  106  forms a MoCA signal communication path  107 . The MoCA frequency bandpass filter  106  passes the D channel MoCA signals in the 1125-1525 MHz frequency range without significant attenuation. Consequently, MoCA signals  105  freely through the filter  106  without substantial attenuation where the MoCA signals  105  jump or traverse the splitter/combiner  76  in substantially the same way that MoCA signals jump or traverse the splitters  90 ,  92 ,  94  and  104 . In this manner, all of the multimedia devices  16  may communicate with each other through the CATV entry adapter  10  without significant attenuation created by the active circuit components in the CATV upstream and downstream signal communication paths  85  and  99 . However, including the bidirectional MoCA frequency bandpass filter  106  in the CATV entry adapter  10  has no adverse influence over its functionality in distributing CATV signals, because the MoCA frequency bandpass filter  106  rejects the CATV active downstream and upstream signals conducted through the CATV active signal communication paths  85  and  99 . The bidirectional MoCA frequency bandpass filter  106  can also be connected to the input side of the splitter combiner  76 , as shown in  FIG. 5 . 
     Another significant advantage of the CATV entry adapter  10  is that it includes a MoCA frequency rejection filter  108  connected between the splitter/combiner  76  and the CATV network entry port  44 . The MoCA frequency rejection filter  108  prevents signals in the MoCA frequency band from passing from the splitter/combiner  76  into the CATV network, but allows the CATV active downstream and upstream signals to pass without impairment. The MoCA rejection filter  108  absorbs the energy of any MoCA signals, thereby preventing the MoCA signals from reaching the CATV network  20 . Eliminating the MoCA signals by use of the MoCA rejection filter  108  prevents the MoCA signals from the MoCA network  14  ( FIG. 1 ) from being received and comprehended at an adjacent subscriber premises. Without the MoCA rejection filter  108  and is understood from  FIG. 1 , the MoCA signals from one CATV entry adapter  10  could traverse the drop cables  38  to the cable tap  36 , and from the cable tap through another drop cable  38  of that cable tap  36  to an adjacent CATV entry adapter  10 . The MoCA rejection filter  108  prevents this from happening. In addition to protecting the security and privacy of the MoCA signals within the MoCA network  14  in each subscriber premises, the MoCA rejection filter  108  also prevents the MoCA signals from an adjacent subscriber premise from adversely influencing or deteriorating the quality of the MoCA signals in an adjacent MoCA network connected to a cable tap  36  ( FIG. 1 ). 
     As described above, the CATV entry adapter  10  of the present invention beneficially contributes to establishing a MoCA in-home entertainment network. All of the active and passive ports of the CATV entry adapter are usable in the MoCA network. The CATV entry adapter is therefore fully functional as a MoCA network hub to communicate all MoCA signals between all MoCA interface devices without substantially attenuating the strength of the MoCA signals in such a way that the MoCA interface devices are unable to compensate in the manner intended by the MoCA communication protocol. The CATV entry adapter prevents or greatly inhibits MoCA signals from reaching the CATV network. Doing so does not compromise the privacy and security of the MoCA content which is expected to be maintained only within the MoCA network of the subscriber premises. By confining the MoCA signals to the MoCA network at the subscriber premises, MoCA signals are not available over the CATV network to interfere with other MoCA networks established at other subscriber premises. The advantageous functionality of the CATV entry adapter in regard to MoCA network communications is protected within the housing of the CATV entry adapter, to shield it from unauthorized removal, tampering, forgetfulness in original installation, and physical exposure. The CATV entry adapter does not inhibit or otherwise adversely influence normal CATV signal distribution functionality. The multi-functional aspects of the CATV entry adapter allow it to be used in a wide variety of situations, thereby increasing its economies of scale and facilitating greater convenience in installation by the CATV service provider. In addition, use of the CATV entry adapter allows subscribers more flexibility in expanding and changing both their CATV subscriber equipment and their MoCA network and multimedia devices. 
     The significance of these and other improvements and advantages will become apparent upon gaining a full appreciation of the present invention. A preferred embodiment of the invention and many of its improvements have been described above with a degree of particularity. The detailed description is of a preferred example of implementing the invention. The detail of the description is not necessarily intended to limit the scope of the invention. The scope of the invention is defined by the following claims.