Abstract:
A local area network ( 60 ) within a residence or other building, including both wired ( 5 ) and non-wired segments ( 53 ). The wired segments are based on new or existing wires ( 5   a,    5   b,    5   c,    5   d,    5   e ) in the building, wherein access to the wires is provided by means of outlets ( 61   a,    61   d ), such as a telephone system, electrical power distribution system, or cable television wiring system. The non-wired segments are based on communication using propagated waves such as radio, sound, or light (e.g. infrared). The wired and non-wired segments interface in the outlet, using a module ( 50 ) that serves as mediator between the segments. The module can be integrated into the outlet, partially housed in the outlet, or attached externally to the outlet. Such a network allows for integrated communication of data units ( 24   b ) connected by wires and data units ( 24   a,    24   d ) connected without wires.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. application Ser. No. 09/552,564 filed on Apr. 19, 2000 now U.S. Pat. No. 6,842,459, and U.S. Ser. No. 10/890,199, filed on Jul. 14, 2004. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to the field of communication networks, and, more specifically, to the networking of devices within a building via combined wired and non-wired communication. 
     BACKGROUND OF THE INVENTION 
     There is a growing need for networking within the home. This need is driven by two major factors, the increasing use of multiple data devices and the emergence of broadband services in the home. 
     Lately there has been an expansion in the number of homes in the USA with multiple personal computers. In addition, connectivity and networking capabilities have been added to appliances, such as refrigerators and microwave ovens. Furthermore, there is a trend toward enabling data connectivity among various multimedia (audio and video) appliances such as TV&#39;s, VCR&#39;s, receivers, and speakers. The term “data unit” as used herein denotes any device capable of generating and/or receiving data. The networking of data units enables the sharing of files and applications as well as the sharing of common peripheral devices, along with other benefits. 
     Another driving force behind the need for home connectivity products is the growth in the number of on-line households. As high-speed connections to information and broadband entertainment sources soar, there is a growing need to share and distribute this access among appliances within the house. These broadband services are supplied mainly by three types of service providers:
         1. Telco&#39;s, via xDSL connections (currently ADSL, to be followed by VDSL).   2. CATV. Currently via Cable-Modem, to be followed by digital Set-Top-Box.   3. Wireless connections, such as Satellite, LMDS, WLL, and others.       

     Communication within a home can be classified into two types: wired and non-wired. These are covered below: 
     Wired Communication 
     Wired communication requires using at least two distinct electrical conductors. The wiring can be new wiring installed and dedicated for data communication within the home, such as installing structured wiring such as Category 5 type, used in Ethernet IEEE802 networks. However, the installation of a new wiring structure within a home is labor-intensive, complex, and expensive. Alternatively, existing home wiring, which was previously installed for a specific purpose, can be used for data communication without substantially affecting or degrading the original service. Existing wiring includes telephone wiring, power line wiring, and cable TV wiring. These are reviewed below. 
     For all wired configurations,  the present invention relies upon electrically-conducting lines which may be pre-existing within a building, which have at least two distinct electrical conductors, and which are capable of transporting data communication signals. Furthermore, the present invention relies upon suitable outlets, to which the electrically-conducting lines are coupled, and which are capable of connecting to external devices. 
     Telephone Wiring 
     In-home telephone service usually employs two or four wires, and is accessed via telephone outlets into which the telephone sets are connected. 
       FIG. 1  shows the wiring configuration of a prior-art telephone system  10  for a residence or other building, wired with a telephone line  5 . Residence telephone line  5  consists of single wire pair which connects to a junction-box  16 , which in turn connects to a Public Switched Telephone Network (PSTN)  18  via a cable  17 , terminating in a public switch  19 , which establishes and enables telephony from one telephone to another. The term “analog telephony” as used herein denotes traditional analog low-frequency audio voice signals typically under 3 KHz, sometimes referred to as “POTS” (“Plain Old Telephone Service”), whereas the term “telephony” in general denotes any kind of telephone service, including digital service such as Integrated Services Digital Network (ISDN). The term “high-frequency” as used herein denotes any frequency substantially above such analog telephony audio frequencies, such as that used for data. ISDN typically uses frequencies not exceeding 100 KHz (typically the energy is concentrated around 40 Khz). The term “telephone line” as used herein denotes electrically-conducting lines which are intended primarily for the carrying and distribution of analog telephony, and includes, but is not limited to, such electrically-conducting lines which may be pre-existing within a building and which may currently provide analog telephony service. The term “telephone device” as used herein denotes, without limitation, any apparatus for telephony (including both analog telephony and ISDN), as well as any device using telephony signals, such as fax, voice-modem, and so forth. 
     Junction box  16  is used to separate the in-home circuitry from the PSTN and is used as a test facility for troubleshooting as well as for wiring new in the home. A plurality of telephones  13   a  and  13   b  connects to telephone lines  5  via a plurality of telephone outlets  11   a,    11   b ,  11   c , and  11   d . Each outlet has a connector (often referred to as a “jack”), denoted in  FIG. 1  as  12   a ,  12   b ,  12   c , and  12   d , respectively. In North-America, RJ-11 is commonly used. Each outlet may be connected to a telephone unit via a connector (often referred to as a “plug”), denoted in  FIG. 1  (for the two telephone units  13   a  and  13   b  illustrated) as  14   a  and  14   b , respectively. It is also important to note that lines  5   a ,  5   b ,  5   c ,  5   d , and  5   e  are electrically the same paired conductors. 
     While network  10  exhibits serial or daisy-chained topology wherein the wiring is serialized from an outlet the next one only, other topologies such as star, tree or any arbitrary topology may also exist. However, the telephone wiring system within a residence is always composed of wired media: two or four copper wires, and several outlets which provides direct access for connecting to these wires. 
     There is a requirement for simultaneously using the existing telephone infrastructure for both telephone and data networking. In this way, the task of establishing a new local area network in a home or other building is simplified, because there would be no additional wires to install. U.S. Pat. No. 4,766,402 to Crane (hereinafter referred to as “Crane”) teaches a way to form LAN over two-wire telephone lines, but without the telephone service. 
     As an another example, relevant prior-art in this field is disclosed in U.S. Pat. No. 5,896,443 to Dichter (hereinafter referred to as “Dichter”). Dichter suggests a method and apparatus for applying frequency domain/division multiplexing (FDM) technique for residential telephone wiring, enabling simultaneously carrying telephone and data communication signals. The bandwidth enabled by the wiring is split into a low-frequency band capable of carrying an analog telephony signal and a high-frequency band capable of carrying data communication signals. In such mechanism, the telephone service is not affected, while data communication capability is provided over existing telephone wiring within a home. 
     The concept of frequency domain/division multiplexing (FDM) is well-known in the art, and provides means of splitting the bandwidth carried by a wire into a low-frequency band capable of carrying an analog telephony signal and a high-frequency band capable of carrying data communication or other signals. Such a mechanism is described, for example, in U.S. Pat. No. 4,785,448 to Reichert et al. (hereinafter referred to as “Reichert”). Also widely used are xDSL systems, primarily Asymmetric Digital Subscriber Loop (ADSL) systems. 
     The Dichter network is illustrated in  FIG. 2 , which shows a network  20  serving both telephones and providing a local area network of data units. Data Terminal Equipment (DTE) units  24   a ,  24   b , and  24   c  are connected to the local area network via Data Communication Equipment (DCE) units  23   a ,  23   b , and  23   c , respectively. Examples of Data Communication Equipment include modems, line drivers, line receivers, and transceivers (the term “transceiver” herein denotes a combined transmitter and receiver). DCE units  23   a ,  23   b , and  23   c  are respectively connected to high pass filters (HPF)  22   a ,  22   b , and  22   c . The HPF&#39;s allow the DCE units access to the high-frequency band carried by telephone-line  5 . In a first embodiment (not shown in  FIG. 2 ), telephones  13   a ,  13   b , and  13   c  are directly connected to telephone line  5  via connectors  14   a ,  14   b , and  14   c , respectively. However, in order to avoid interference to the data network caused by the telephones, in a second embodiment (shown in  FIG. 2 ) low pass filters (LPF&#39;s)  21   a ,  21   b , and  21   c  are added to telephones  13   a ,  13   b , and  13   c  from telephone line  5 . Furthermore, a low pass filter is also connected to Junction Box  16 , in order to filter noises induced from or to the PSTN wiring  17 . It is important to note that lines  5   a ,  5   b ,  5   c ,  5   d , and  5   e  are electrically the same paired conductors. 
     Additional prior-art patents in this field can be found under US Class 379/093.08, which relates to carrying data over telephone wiring without any modifications made to the telephone wiring (e.g. wires and outlets). U.S. Pat. No. 5,841,360 and U.S. patent applications Ser. Nos. 09/123,486 and 09/357,379 to the present inventor are the first to suggest modifying the telephone wiring, by means of splitting the wiring into distinct segments, each of which connects two telephone outlets. In this way, the network is modified from ‘bus’ topology into multiple ‘point-to-point’ segments, enabling superior communication characteristics. 
     Part of such a network  30  is shown in  FIG. 3 , describing outlets  31   a  and  31   b,  substituting outlets  11  of  FIGS. 1 and 2 . The telephone wiring  5  is split into distinct segments  5   a ,  5   b  and  5   c . Low-Pass Filter (LPF) and High-Pass Filters (HPF) are coupled to each wire segment end, in order to split between the telephony and the data signals. As shown in  FIG. 3 , LPF&#39;s  21   b  and  21   c  are attached to each end of wiring segment  5   b . The LPF&#39;s are designed to allow passing of the telephony signals, and are connected together thus offering a continuous path for the telephony signals. Access to the telephony signals is made via connectors  12   a  and  12   b  in the outlets, into which telephone devices  13   a  and  13   b  are connected via connectors  14   a  and  14   b  respectively. Thus, the telephony service is fully retained. The data signals, carried in the high part of the spectrum, are accessed via HPF&#39;s  26   a  and  22   b , coupled to each end of the telephone wire segment  5   b . HPF&#39;s  22   a  and  26   b  are connected to the ends of the wire segments  5   a  and  5   c  respectively. Each HPF is connected to a modem  23  and  27 , which transmit and receive data signals over the telephone wiring. Modems  23   a ,  27   a ,  23   b , and  27   b  are connected to HPF&#39;s  22   a ,  26   a ,  22   b  and  26   b  respectively. Data units  24   a  and  24   b  are connected to the outlets  31   a  and  31   b  respectively, via a connector (not shown in the Figure) in the outlet. The data units are coupled via DTE interface in the outlet. Outlets  31   a  and  31   b  comprise DTE interfaces  29   a  and  29   b  respectively. The three data streams in each outlet, two from each modem and one from the DTE, are handled by an adapter  28   a  and an adapter  28   b , which serve outlets  31   a  and  31   b , respectively. While  FIG. 3  describes an embodiment wherein all the components for the relevant functions are housed within the outlet, other embodiments are also possible, wherein only some of the components for these functions are contained within the outlet. 
     Power Lines 
     It is possible to transmit data over wiring used for distribution of electrical power within the home, which is normally at a frequency of 50 or 60 Hz. Access to the power is available via power outlets distributed around the house. Such wiring consists of two wires (phase and neutral) or three wires (phase, neutral, and ground). 
     FDM techniques, as well as others, are used for enabling data communication over power lines. Many prior-art patents in this field can be found in US Class 340/310. 
     Cable Television Lines 
     It is also possible to transmit data over wiring used for the distribution of television signals within the home. Such wiring usually is coaxial cable. 
     Both power line and cable television wiring systems resemble the telephone line structure described in  FIG. 1 . The wiring system is based on conductors, usually located in the walls, and access to these wires is obtained via dedicated outlets, each housing a connector connected directly to the wires. Common to all these systems, is the fact that the wiring was installed for a dedicated purpose (telephone, power, or cable TV signal distribution). Wherever one of these existing wiring systems is used for carrying data, it is desirable that the original service (telephony, power, or television signal distribution) be unaffected. Dedicated modems are used for carrying data over the media concurrently with the original service. 
     When using existing wiring, specific wired modems are normally required for communicating over the electrically-conducting lines, and access to the electrically-conducting lines is provided via the relevant outlets. Using electrically-conducting lines as the communication media allows for high bandwidth, and provides robust and cost-effective communication. In addition, communication over large distances is possible, which in most cases enables coverage of the whole house, thereby guaranteeing communication from any outlet to another within the house. 
     Such networks, however, require data units to be connected to the outlets, usually by means of a cable from the data unit to a suitable nearby outlet. This makes the connection complex and hard-to-use, requires the data unit to be in proximity to an appropriate outlet, and impairs mobility for some data units within the house. 
     Non-Wired Communication 
     Non-wired solutions for in-home data networking use waves propagated without an electrically-conducting medium. Three main techniques are commonly used:
         1. Radio Frequency (RF). Transmission of data between data units can be accomplished with radio frequency electromagnetic signals. As an example, IEEE802.11 can be used.   2. Light. Transmission of data between data units can be accomplished with light in the visible or non-visible spectrum. Currently, the most popular is infrared (IR) based communication. Most such systems require ‘line-of-sight’ placement of the communicating data units.   3. Sound. Transmission of data between data units can be accomplished with sound waves, either in the audio spectrum (20-20,000 Hz), or inaudible spectrum (ultrasonic, above 20,000 Hz; or infrasonic, below 20 Hz).       

     It is noted that although light and radio waves are both electromagnetic phenomena, they occupy different parts of the electromagnetic spectrum and have significantly different characteristics for purposes of the present invention. Thus, light and radio waves are herein treated as distinct physical phenomena. 
     An example of a non-wired data network  40  is shown in  FIG. 4 . Two data units  41   a  and  41   b  are shown, into which non-wired transceivers  42   a  and  42   b  are respectively coupled. The non-wired transceivers  42   a  and  42   b  communicate over a space  43  without any electrically-conducting medium. If RF transmission is used, the transceivers are RF transceivers, and the communication over space  43  is based on the propagation of radio frequency electromagnetic waves. Similarly, in the case of light-based communication, transceivers  42   a  and  42   b  utilize light emitters (e.g. LEDs) and light detectors (e.g. photoelectric cell), and the communication over space  43  relies on the propagation of light. Likewise, in the case of sound-based communication over space  43 , the transceivers use microphones and speakers, and the communication relies on the propagation of sound waves through the air in the space  43 . 
     Since these solutions do not require any physical connection such as cable, they provide both ease-of-use and mobility. However, such non-wired solutions are effective over short distances only. Furthermore, most of the non-wired solutions cannot easily pass through walls and other such obstructions, owing to the attenuation to the signals. Hence, such techniques are suitable for communication within a single room, but are not suitable for communication between the rooms of a home or other building. 
     There is thus a widely recognized need for, and it would be highly advantageous to have, a means for implementing a data networking in-home between data units, wherein such data units can be networked within a home or other building, while providing mobility and ease of use. This goal is met by the present invention. 
     SUMMARY OF THE INVENTION 
     The present invention discloses a data communication network within a building having wired and non-wired segments. The wired segments are based on electrically-conducting lines installed within the building. In addition to supporting data communication, these electrically-conducting lines concurrently distribute a primary service other than the transport of data communication signals, such as telephone service, electrical power service, or cable television service, and may be pre-existing wires originally-installed to distribute the primary service. Dedicated outlets are used to enable direct access to the wiring. The present invention uses means for utilizing the electrically-conducting lines concurrently for both the transport of data communication signals and the primary service, without any interference between these two uses. The non-wired segments employ communication without electrically-conducting media, via waves propagated through open space, such as by light or radio waves, or by acoustic waves in air. 
     The wired and non-wired segments are combined by means of circuitry in one or more outlets. The coupling device is a module containing one port for coupling to the wired network using a specific wired modem. Another port of the device couples to the non-wired segment, using a non-wired modem. An adapter handles the data flow between the wired segment and the non-wired segment, and has provision for protocol conversion, if required. 
     The module coupling both segments, or any of the components of the module, can be fully integrated into the outlet, partially integrated into the outlet, or externally coupled to it. 
     Therefore, according to the present invention there is provided a local area network within a building for transporting data among a plurality of data units, the local area network including at least one wired segment and at least one non-wired segment, wherein the at least one wired segment includes: (a) at least one electrically-conducting line within the building, the electrically-conducting line having at least two conductors and operative to transport data communication signals; (b) at least two outlets, each operative for coupling to the electrically-conducting line; and (c) at least one wired modem coupled to the electrically-conducting line, operative to communicate over the electrically-conducting line; (d) and wherein the at least one non-wired segment is operative to communicating data without electrically-conducting media and includes at least one non-wired modem, wherein at least one of the outlets couples a wired segment to a non-wired segment, and wherein the at least one electrically-conducting line is furthermore operative for concurrently distributing a service other than the transport of data communication signals. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention is herein described, by way of example only, with reference to the accompanying drawings, wherein: 
         FIG. 1  shows a common prior art telephone line-wiring configuration for. a residence or other building. 
         FIG. 2  shows a first prior art local area network based on telephone line wiring for a residence or other building. 
         FIG. 3  shows a second prior art local area network based on telephone line wiring for a residence or other building. 
         FIG. 4  shows a prior art non-wired communication network. 
         FIG. 5  shows modules according to the present invention. 
         FIG. 6  shows a local area network according to the present invention, wherein telephone wiring used for the wired segment and radio-frequency communication for the non-wired segment. 
         FIG. 7  shows a second embodiment of a local area network based on telephone lines as the wired segment and radio frequency communication for the non-wired segment. 
         FIG. 8  shows a kit for upgrading existing electrically-conducting lines to support a network according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The principles and operation of a network according to the present invention may be understood with reference to the drawings and the accompanying description. The drawings and descriptions are conceptual only. In actual practice, a single component can implement one or more functions; alternatively, each function can be implemented by a plurality of components and circuits. In the drawings and descriptions, identical reference numerals indicate those components that are common to different embodiments or configurations. 
     The invention is based on a wired/non-wired network adapter module (hereinafter referred to as “module”). A functional description of such a module  50  is shown in  FIG. 5 . The module comprises a physical port  54  for connecting to the wired network. The communication with the wired network is carried by wired transceiver  51 . Wired transceiver port  54  and transceiver  51  are dependent upon the type of wired network. Interfacing a telephone line-based network requires a telephone line transceiver, while connecting to a power line network requires a power line dedicated modem. Additionally, the connection to the wired network may require specific means in order to meet regulatory and safety requirements, as well as specific means for ensuring that the basic service (e.g. telephony service, power distribution) is not substantially degraded or affected. 
     The non-wired segment interfaces via a port  55 . Port  55  communicates without an electrically conducting medium. Communication with this non-wired segment is handled by a non-wired modem/transceiver  53 . The term “non-wired modem” herein denotes any device capable of data communication without requiring an electrically conducting medium. The data to and from the wired segment and the data to and from the non-wired segment are handled by a protocol adapter  52 . Protocol adapter  52  may serve as a transparent unit, acting as a repeater/regenerator, dealing with the physical layer only of the OSI model. However, higher layers can also be handled by the protocol adapter  52 . In such a case, the protocol adapter will function as a bridge, router, gateway or any other adaptation mechanism as required. 
     Other facilities of module  50  may contain logic, control, processing, storage, power-supply and other components not shown in  FIG. 5 . The communication supported by module  50  can be simplex (unidirectional, either from the wired towards the non-wired segment or vice-versa), half-duplex, or full duplex. A module  50   a  connects a telephone line network segment to an RF network segment. Module  50   a  employs a telephone line modem  51   a  as the wired network interface, a radio-frequency modem  53   a  as an interface to the non-wired network segment, and a protocol adapter  52   a . A module  50   b  is an embodiment of the present invention, in which the telephone line transceiver can be implemented by a high-pass filter (HPF)  22   a  and data terminal equipment (DCE)  23   a , as also used by Dichter as discussed previously. 
       FIG. 6  shows an embodiment of a network  60  according to the present invention that includes wired and non-wired segments. The wired segment is based on telephone wiring  5  within a building as described in  FIG. 1 . While outlets  11   b  and  11   c  are unchanged, outlets  11   a  and  11   d  are replaced by outlets  61   d  and  61   a , respectively, containing modules  50   d  and  50   e  respectively. Basic telephone service is retained by employing low-pass filters (LPF)  21   d  and  21   a  in outlets  61   d  and  61   a  respectively. The LPF&#39;s are coupled to telephone connectors  12   d  and  12   a  respectively, enabling connection of telephone devices. This is illustrated by a telephone  13   a  connected by connector  14   a  to connector  12   a  in outlet  61   a . A Dichter-type data communication network is established by connecting data terminal equipment (DTE) via a modem and HPF, as illustrated by DTE  24   b  connected to DCE  23   b,  which is coupled to HPF  22   b , which is in turn directly coupled to telephone wiring  5  via connector  12   b  in outlet  11   b.    
     The non-wired part of network  60  is based on radio frequency transmission, utilizing a pair of RF transceivers  53  ( FIG. 5 ). As shown in  FIG. 6 , DTE&#39;s  24   d  and  24   a  are coupled to RF transceivers  53   c  and  53   b , respectively. In turn, each such RF transceiver communicates with RF transceivers  53   d  and  53   a , respectively, which are integrated within outlets  61   d  and  61   a , respectively. 
     Integrating the wired and non-wired segments of the network is accomplished by modules  50   d  and  50   e , each of which is illustrated by module  50   c  in  FIG. 5 . Modules  50   d  and  50   e  are integrated within outlets  61   d  and  61   a , respectively. Each such module interfaces the wired segment of the network by a telephone modem. Each such modem contains a high-pass filter  22  and DCE  23 , as described previously for a Dichter-type network. Interfacing to the non-wired segment of network  60  is performed via an RF transceiver, wherein modules  50   d  and  50   e  comprises RF transceivers  53   d  and  53   e  respectively. Protocols and data conversion between both segments are performed by adapter  52  ( FIG. 5 ), wherein adapters  52   d  and  52   e  are integrated within modules  50   d  and  50   e  respectively. 
     Network  60  allows DTE&#39;s  24   d ,  24   b  and  24   a  to communicate among themselves. While DTE  24   b  is connected to the network via a wired connection, DTE&#39;s  24   d  and  24   a  can communicate in a non-wired manner. While  FIG. 6  illustrates a single DTE connected by wires and two DTE&#39;s connected without wires, it is obvious that any number of DTEs of each type can be connected. Furthermore, while in network  60  each outlet supports a single wired or non-wired DTE connection, other implementations can also be supported. For example, an outlet can provide one or more wired connections simultaneously with one or more non-wired connections. 
     While  FIG. 6  illustrates the case where module  50  is integrated in an outlet  61 , embodiments of the present invention also include those wherein the module is external to the outlet. Similarly, selective parts of a module may be integrated within an outlet while other parts are external. In all cases, of course, appropriate electrical and mechanical connection between the module and the outlet are required. 
     A network outlet is physically similar in size, shape, and overall appearance to a standard outlet, so that a network outlet can be substituted for a standard outlet in the building wall. No changes are required in the overall telephone line layout or configuration. 
     Network  60  provides clear advantages over hitherto proposed networks. For example, DTEs (e.g. PC&#39;s) located in different rooms can interconnect without the need to use any wires. A radio-frequency transceiver in each DTE communicates with the nearest outlet, and the outlets communicate between rooms over the telephone wiring media. 
     The invention can equally well be applied to the prior art wired network illustrated in  FIG. 3 .  FIG. 7  shows part of a network  70 . Outlet  31   a  represents a prior-art network outlet. In order to interface to the non-wired network segments, an outlet  71  according to the present invention must be used. With the exception of RF transceiver  53   a  within outlet  71 , which communicates with RF transceiver  53   b  connected to a DTE  24   a , outlet  71  is similar to outlet  31   a . In this embodiment, the module includes two telephone line modems  23   b  and  27   b , a three-port adapter  72  (for the two wired ports and the single non-wired port), and RF transceiver  53   a . The advantages offered by the prior-art topology apply also for this configuration. 
     While the present invention has been described above for the case where the wired media is based on a telephone line system and includes telephone wires and telephone outlets, the present invention can equally well be applied to other wired systems such as those based on power and cable television signal distribution. In the case of an electrical power distribution system, the electrical wires and outlets employed for power distribution in the house are used. Similarly, cable television wiring and outlets can also be used. In all cases, it may be necessary to retain the basic service for which the wiring systems were installed: telephony service, electrical power distribution, or television signals. This is usually achieved by adding the appropriate circuitry to separate the data communication network from the basic service, as well as to avoid interference of any kind between the two roles currently employing the same wiring. For example, the LPF&#39;s  21   a ,  21   b ,  21   c , and  21   d;  and HPF&#39;s  22   a,    22   b ,  26   a , and  26   b  ( FIG. 7 ) serve the role of separating the telephony service from the data communication network and vice-versa. 
     While the present invention has been described above for the case wherein the non-wired communication is accomplished by radio-frequency transmission, the present invention can be equally applied to other types of non-wired communication, such as:
         1. Non-wired communication accomplished by other forms of electromagnetic transmission. Electromagnetic waves in various parts of the electromagnetic spectrum can be used for communication. For example, low-frequency electromagnetic radiation can be used to transmit audio-frequency signals over short distances without a carrier. Radio-frequency transmission is a special case of this general electromagnetic transmission. As noted previously, light is also a special case of electromagnetic radiation, but is herein treated separately because of the characteristics of light are distinctly different from those of electromagnetic transmission in other usable parts of the electromagnetic spectrum.   2. Non-wired communication accomplished by light. Either visible or non-visible light wavelength can be used for such transmission. As previously noted, currently, the most popular is infrared (IR) based communication. Most such systems require substantially ‘line-of-sight’ access.   3. Non-wired communication accomplished by sound. Either audible sound (20-20,000 Hz band), or inaudible sound (ultrasonic, above 20,000 Hz; or infrasonic, below 20 Hz).       

     In addition to the described data communication function, the network according to the present invention can also be used for control (e.g. home automation), sensing, audio, or video applications, and the communication can also utilize analog signals (herein denoted by the term “analog communication”). For example, a video signal can be transmitted in analog form via the network. 
     Upgrade Kit 
     The present invention also contemplates a kit for upgrading existing electrically conducting lines to support a network as described above.  FIG. 8  illustrates an embodiment of such a kit containing an outlet  132  and an outlet  134  and installation instructions  136 . Outlet  132  has connection  144  for coupling to a wired segment and mounting points such as a flange  146  for installing in the building walls. Outlet  132  also has a jack  138  and a jack  140  for connecting to external devices via cables, and a transducer  142  for connecting to external data units via a non-wired segment. Within outlet  132  is a module according to the present invention, as previously described and illustrated in  FIG. 5 . In one embodiment, transducer  142  is a radio frequency transceiver. In another embodiment, transducer  142  is a combined light-emitting diode and photocell receiver. In still another embodiment, transducer  142  is a combined speaker and microphone. Likewise, in one embodiment, jack  138  is a telephone jack. In another embodiment, jack  138  is an electrical power socket. In still another embodiment, jack  138  is a cable television jack. In one embodiment, jack  140  is a data jack. The embodiment of the kit illustrated in  FIG. 8  has two outlets, outlet  132  and outlet  134 , which are illustrated as substantially identical. However, in another embodiment, the kit contains only outlet  132 . In still another embodiment, outlet  134  does not contain a transducer. Other variations are also possible in different embodiments. 
     It will also be appreciated that the outlet and the adapter module may be provided as separate components for use in upgrading existing wiring of a building to support a local area network having at least one wired segment and at least one non-wired segment. They may likewise find independent use for further expanding a hybrid network that has previously been upgraded according to the invention. Such an outlet is provided with a first coupler for coupling the outlet to the at least one non-wired segment, and a second coupler for coupling the outlet to the existing wiring via an adapter module. The adapter module may be either fully or partially integrated within the outlet. 
     A method for upgrading existing electrically conducting lines within a building to support a network according to the present invention involves:
         (a) providing a wired modem;   (b) providing a non-wired modem;   (c) providing an adapter for handling the data communications between a wired segment and a non-wired segment; and   (d) providing an outlet, and   (e) equipping the outlet with the wired modem, the non-wired modem, and the adapter.       

     While the invention has been described with respect to a limited number of embodiments, it will be appreciated that many variations, modifications and other applications of the invention may be made.