Smart cables

RELATED APPLICATIONS

0001The present application is related to commonly-assigned <patcit id="pcit0001" dnum="US65033007A"><text>U.S. Patent Application Number 11/650,330</text></patcit> (Attorney Docket No. 20750P-002400/P4998), titled "Backward Compatible Connector System," by Murphy et al., filed 01/05/2007, which is hereby incorporated by reference in its entirety. The present application claims benefit under 35 USC 119(e) of <patcit id="pcit0002" dnum="US96994607P"><text>U.S. Provisional Application No. 60/969,946</text></patcit> (Attorney Docket No. 20750P-003300/P5379USP1), filed on September 4, 2007, titled "Smart Cables," the content of which is incorporated herein by reference in its entirety.

FIELD OF INVENTION

0002The present invention relates in general to electronic cables. More particularly, the invention relates to smart cables that can provide additional functionality such as identification and authentication.

BACKGROUND OF THE INVENTION

0003The handheld consumer electronic market continues to grow at an extraordinary pace, and more of these products provide increasing interconnectivity with other electronic devices. By way of example, electronic products such as mobile phones, personal digital assistants (PDAs), media players, CD players, DVD players, televisions, game players, digital cameras and the like invariably include connectors for making connection to other electronic devices via cables. The different types of connectors may include electrical contacts to carry various types of signals such as digital or analog audio and/or video signals, USB, Firewire, etc.

0004Examples of media devices with a highly versatile connector system are the iPod and the iPhone manufactured by Apple Inc. of Cupertino, California. These media devices may communicate with their accessories and other peripheral devices through one or more cable apparatus. For example, the media devices can send audio signals to a speaker, and/or send video signals to a computer display or television. In order to transmit various kinds of signals, different types of cables may be used. Different cables may have different performance characteristics and may be designed to operate with different communication protocols. Such information often needs to be efficiently communicated to the media devices. Hence it is highly desirable to improve electronic cabling techniques for media devices.

BRIEF SUMMARY OF THE INVENTION

0005The present invention relates to smart cables that incorporate functionality to provide information such as identification and authentication to devices to which they connect. In various embodiments, a cabling apparatus includes circuitry that can communicate with another device information about the cable including, for example, whether the cable is an authorized cable, what type of cable it is, what type or types of signal(s) it can carry, etc. If the cable is, for example, a composite video or a component video cable connecting a media device to a display, circuitry incorporated in the cable apparatus, according to one embodiment of the present invention, can identify itself and can instruct the media device to supply the display with the appropriate composite or component video signal. The various embodiments of the invention are described in the context of media devices, but it should be recognized that the invention has broader range of applicability.

0006According to one embodiment of the present invention, a cable apparatus may include a first connector including a housing, a plurality of contacts, and one or more processing components. Additionally, the cable apparatus may include a cable having a first end coupled to the first connector and a second end coupled to one or more second connectors. The one or more second connectors can be configured to connect with one or more electronic devices. The one or more processing components of the cable apparatus can be configured to receive an authentication inquiry from an electronic device through the plurality of contacts, generate an authentication response, and output the authentication response to the electronic device through the plurality of contacts. The authentication response may be associated with whether the cable apparatus is an authorized accessory for the electronic device.

0007According to another embodiment, a cable apparatus may include a first connector including a housing, a plurality of contacts, and one or more processing components. Additionally, the cable apparatus may include a cable having a first end coupled to the first connector and a second end coupled to one or more second connectors. The one or more second connectors can be configured to be coupled to one or more electronic devices respectively. The one or more processing components can be configured to identify a type of the cable apparatus, generate a cable identification signal, and output the identification signal to the electronic device through the plurality of contacts. The identification signal may be associated with one or more types of signals to be carried by the cable apparatus.

0008According to another embodiment, a method for operating a cable apparatus includes providing the cable apparatus with circuitry to implement a cable identification process, the cable circuitry to be powered upon connection of the cable apparatus to another electronic device. The method includes the cable circuitry identifying the type of cable and generating a cable identification signal, and the cable circuitry transmitting the cable identification signal to the electronic device. The process of identifying the type of cable may include detecting a signal level on node in the cable circuitry. Alternatively, the process of identifying the type of cable may include transmitting one or more test signals to predetermined contacts coupled to the cable apparatus.

0009According to another embodiment, a method for operating a cable apparatus includes providing the cable apparatus with circuitry to implement a cable authentication process, the cable circuitry to be powered upon connection of the cable apparatus to another electronic device. The method includes the cable circuitry receiving an authentication request from the electronic device and performing an authentication process. The cable circuitry then generating a cable authentication signal and transmitting the cable identification signal to the electronic device.

0010According to yet another embodiment, a method of operating a cable apparatus may include receiving an authentication inquiry by a cable apparatus from an electronic device, processing the authentication inquiry by the cable apparatus, sending an authentication response from the cable apparatus to the electronic device, receiving an identification inquiry by the cable apparatus from the electronic device, identifying a cable type for the cable apparatus by the cable apparatus, and sending an identification signal based on at least information associated with the identified cable type. The authentication response can be associated with whether the cable apparatus is an authorized accessory for the electronic device, and the identification signal can be associated with one or more types of signals related to the cable apparatus.

0011The various features and advantages of the present invention can be more fully appreciated with reference to the detailed description and accompanying drawings that follow.

BRIEF DESCRIPTION OF THE DRAWINGS

0012<figref idref="f0001">Figure 1</figref> illustrates a simplified cable apparatus according to an exemplary embodiment of the present invention;

0013<figref idref="f0002">Figure 2</figref> illustrates a portion of the cable apparatus including circuitry incorporated therein according to another exemplary embodiment of the present invention;

0014<figref idref="f0003">Figure 3</figref> illustrates the cable apparatus coupled with a media device and one or more peripheral devices according to an exemplary embodiment of the present invention;

0015<figref idref="f0004">Figures 4</figref>, <figref idref="f0005">5</figref> and <figref idref="f0006">6</figref> illustrate various methods of operation for the smart cable according to embodiments of the present invention; and

0016<figref idref="f0007">Figure 7</figref> is an example of a list of signals for a connector that may connect to a smart cable according to one embodiment of the presentation.

DETAILED DESCRIPTION OF THE INVENTION

0017<figref idref="f0001">Figure 1</figref> illustrates a simplified cable apparatus according to an exemplary embodiment of the present invention that is capable of communicating information such as cable identification and authentication upon connection to another device. Cable apparatus 100 may include connector 110 at one end, one or more connector ends 120 at another end, and cable 130 as well as one or more cable lines 140 that couple the connector ends of the cable apparatus. Connector 110 may include contact housing 112 which encloses a plurality of electrical contacts (not shown), and connector boot 114 which houses the assembly that connects wires from the cable lines to the electrical contacts. Within connector boot 114, there can also be electronic components (not shown) that are configured to perform electrical functionality such as cable authentication, cable identification, electrostatic discharge protection and the like. One example of a connector assembly that can integrate such functionality onto, for example, a printed circuit board (PCB) inside the boot of the connector is described in the above-referenced patent application number <patcit id="pcit0003" dnum="US11650330B"><text>11/650,330</text></patcit> (Attorney Docket No. 20750P-002400/P4998), titled "Backward Compatible Connector System," by Murphy et al., which is hereby incorporated by reference in its entirety.

0018Plurality of cable lines 140 may be configured to carry a respective plurality of signals, each line connecting to at least one of plurality of connectors 120. By way of example, plurality of connectors 120 may include at least an audio connector, a video connector, and/or a USB connector. If cable system 100 is configured to provide, for example, a composite video cable, the circuitry that may be integrated inside boot 114 of connector 110 can be configured to identify the type of cable and transmit that information (i.e., that the cable is a composite video cable) to the device to which it connects. The device could be, for example, a media device such as an iPod or an iPhone. The media device then automatically provides the appropriate signal, i.e., composite video signal, to the cable. Cable apparatus 100 can provide any one or more of the other types of cables and signals that media devices such as the iPod support, including analog audio, digital (USB) audio, component video, HDMI, DVI, S-video, etc.

0019Various modifications and variations to cable apparatus 100 are possible. For example, each line 140 may include one or more lines, each of which can independently carry one or more signals. In another example, cable lines 140 may include only one line that is combined with cable 130 to form a single cable. According to some embodiments, one or more additional components may be added to those noted above. Depending upon the embodiment, the specific arrangement of components may be interchanged. Further details of the various arrangements and cabling components can be found throughout the present specification below.

0020<figref idref="f0002">Figure 2</figref> illustrates a high level block diagram for connector 110 in cable apparatus 100 according to an exemplary embodiment of the present invention. As discussed above, connector 110 may include a contact housing 112 and a connector boot 114. In one embodiment, connector boot 114 houses a PCB (not shown) on which various circuit components can be mounted. The circuit components can include, for example, micro-controller 210, authentication coprocessor 220, and identification wire 230 that may be electrically coupled together via circuit traces on the PCB. An example of the internal construction of connector 100 can be found in the above-referenced patent application number <patcit id="pcit0004" dnum="US11650330B"><text>11/650,330</text></patcit> (Attorney Docket No. 20750P-002400/P4998), titled "Backward Compatible Connector System," by Murphy et al., in particular in connection with Figure 10B of that application. While these components are described as being housed inside connector 110, it is possible that parts or all of the components are distributed in other parts of cable apparatus 100. Also, these components may be integrated into a single chip or a plurality of integrated circuits.

0021As shown in <figref idref="f0002">Figure 2</figref>, micro-controller 210, authentication coprocessor 220 and identification wire 230 are coupled together and in combination provide the additional functionality. Micro-controller 210 can be primarily responsible for controlling communication to and from the media device via bus 240. Authentication coprocessor 220 can be primarily responsible for implementing the authentication functionality. And identification wire 230 can be used by micro-controller 210 to detect the type of signal the cable is configured to carry (e.g., component video or composite video). A bus 250 can connect the wires from cable 130 to the contacts (or pins) in contact housing 112. There can be an optional bus 260 directly connecting cable 130 to micro-controller 210. As used herein the term bus refers to any mechanism that electrically connects one set of contact points to another and is not limited to any specific type of electro-mechanical means.

0022In operation, when connector 110 is connected to a media device, the media device may send an authentication inquiry to the cable. Micro-controller 210 can receive the authentication inquiry and communicate it to authentication coprocessor 220. Authentication coprocessor 220 then processes the authentication request using an authentication algorithm. The authentication algorithm can be based on, for example, public key encryption using security certificates, digital signatures or other known authentication methodologies. In one embodiment, authentication techniques similar to those described in commonly-assigned <patcit id="pcit0005" dnum="US051499A"><text>U.S. Patent Application Number 11/051,499</text></patcit>, (Attorney Docket No. 20750P-001110/P3503US1) titled "Accessory Authentication For Electronic Devices," which is hereby incorporated by reference in its entirety, can be implemented by authentication coprocessor 220. The result of the authentication process is communicated from authentication coprocessor 220 to micro-controller 210 and from micro-controller 210 to the media device via bus 240. Upon successful authentication, the media device may proceed with further communication with the cable apparatus. While the block diagram of <figref idref="f0002">Figure 2</figref> shows micro-controller 210 and authentication coprocessor 220 as two separate components, it is possible to integrate both functionalities into a single chip.

0023Another functionality integrated in and provided by the cable apparatus according to an embodiment of the present invention is cable identification. According to this embodiment, a signal such as a voltage level provided on identification wire 230 indicates a type of cable. The signal on identification wire 230 can, for example, indicate whether the cable is configured to carry, e.g., composite video, component video or S-video signal. The level of the signal on identification wire 230 can be set by, for example, a resistive circuit that may be coupled either to the power supply (i.e., as a pull-up) or to ground (i.e., as a pull-down) or between both to form a voltage divider. It is also possible to not connect identification wire 230 to any signal and instead use a floating condition to also indicate a type of cable. This embodiment envisions that the cable manufacturer sets the signal level on identification wire 230 simplifying the implementation of micro-controller 210. This allows the use of a more cost-effective micro-controller 210 that can be programmed to detect the signal level on identification wire 230. In this embodiment, once micro-controller 210 determines the type of cable it is associated with, it may internally save that information in a register so that it does not have to make that determination each time it is connected to a media device. Once the cable type is identified (and in some embodiments after the cable is authenticated), micro-controller 210 can transmit a request signal to a media device to which it is connected to enable the appropriate (e.g., audio and/or video) outputs in the correct format. While in this example, the type of cable is determined based on voltage level on identification wire 230, it is also possible to accomplish similar functionality with techniques other than voltage level detection, such as current sensing.

0024In an alternative embodiment, a more sophisticated micro-controller 210 can eliminate the need for identification wire 230 and its associated circuitry by dynamically detecting the type of cable being used. According to this embodiment, micro-controller 210 can be programmed to detect the type of cable upon connection between the media device and an accessory device. <figref idref="f0003">Figure 3</figref> depicts cable apparatus 100 connecting a media device 310 to one or more accessory devices 320. Connector end 110 of cable apparatus 100 connects to media device 310 via contacts 112 while any one or more of connector ends 120 connect to one or more accessory devices 320.

0025According to this embodiment, micro-controller 210 can test whether a connection is made at the accessory end via any one or more of cables 140. This can be done, for example, by micro-controller 210 applying one or more test signals to pre-determined contact pins 112 that are designated to carry specific signal types when connected by cable apparatus 100 to one or more accessory devices 320. In an alternative embodiment, micro-controller 210 can apply the test signals directly to pre-determined wires in cable 130 via bus 260 (see <figref idref="f0002">Figure 2</figref>). Based on the signal(s) returned to micro-controller 210 in response to the test signal(s), the micro-controller can determine how many and which connector end(s) 120 are in fact connected to an accessory. This will enable micro-controller 210 to identify the type of cable being used. For example, if only one connector end 120, such as a male RCA plug for a single composite video cable, is connected, micro-controller 210 will identify the cable as a composite video cable. If, on the other hand, the test indicates connection of three connector ends 120 corresponding to component video signal, then micro-controller 210 identifies the cable as component video cable. It is also possible for micro-controller 210 to determine an erroneous connection (e.g., when only one of the three component connector ends is connected) and signal media device 310 to indicate the erroneous connection on its display. Accordingly, in this embodiment, the cable type is determined by the connection it is providing and therefore can vary from one application to the next. That is, in one application wherein the cable connects a media device to, for example, a video accessory that uses composite video signals, micro-controller 210 will identify the cable type as composite video cable. The same cable when used in another application for connecting a media device to, for example, a video accessory that uses component video will be identified by micro-controller 210 as a component video.

0026Once the type of cable is determined (and, in some embodiments, after the cable is authenticated), micro-controller 210 can transmit the cable preferences for that particular cable type to the media device. The cable preferences depend on the cable type which can be any one or more of the following: USB, Firewire, analog or digital audio, composite video, component video, S-video, HDMI, DVI and the like. For example, preferences for a composite video cable can be audio line out and composite video.

0027In one application, cable apparatus 100 may be used to connect a media device such as an iPod to both a television set via video connector ends and a hi-fi speaker system via the audio connector ends. Cable apparatus 100 automatically performs the authentication process upon connection to media device 310. Cable apparatus 100 can also perform the cable identification process upon connection to media device 310 or upon connection to both media device 310 and accessory devices 320. Micro-controller 210 can perform the cable identification task before, after or in parallel with the authentication process.

0028<figref idref="f0004">Figures 4</figref>, <figref idref="f0005">5</figref> and <figref idref="f0006">6</figref> illustrate various simplified methods of operation for the smart cable according to embodiments of the present invention. Method 400 shown in <figref idref="f0004">Figure 4</figref> depicts one authentication method which may include process 410 for powering up the cable circuitry upon connection to an electronic device such as a media player or an accessory. Once powered up, the cable circuitry may receive an authentication inquiry from the media device (process 420). It is also possible that the authentication inquiry sent from the media device to the cable circuitry may be prompted by the cable circuitry itself requesting to be authenticated. In response to the authentication inquiry, the cable circuitry may process the authentication inquiry and generate an authentication response (process 430). The cable circuitry may next send the authentication response back to the media device (process 440). If the authentication response is accepted by the media device (process 450), cable preferences may be transmitted to the media device (process 460) and further communication via the cable apparatus may be authorized (process 470). If the authentication process fails, the cable may be assumed to be unauthorized and no further communication via that cable may be allowed. In one embodiment, the authorization process may be retried one or more times before the cable apparatus is rejected (process 480).

0029As discussed in connection with <figref idref="f0002">Figures 2</figref> and <figref idref="f0003">3</figref>, these various processes are performed, in one exemplary implementation, by the combination of micro-controller 210 and authentication coprocessor 220. That is, at process 410 upon connecting the cable to media device 320, the internal circuitry of the cable including micro-controller 210 and authentication coprocessor 220 may be powered using, for example, power supplied from media device 320 (or an accessory when connected to an accessory). After power-up, at process 420, micro-controller 210 may receive an authentication request from media device 320. At process 430, micro-controller 210 then communicates with authentication coprocessor 220 to process the request in accordance with the authentication algorithm implemented by coprocessor 220. At process 440, the response generated by authentication coprocessor 220 is then sent back to media device 310 via micro-controller 210. Accordingly, this method provides for a smart cable that includes all the resources to automatically go through an authentication process upon connection to a media device.

0030<figref idref="f0005">Figure 5</figref> is a flow diagram depicting method 500 of cable identification according to another embodiment of the present invention. Method 500 may include process 510 for powering up the cable circuitry upon connection to an electronic device such as a media player or an accessory, process 520 for identifying the type of cable, process 530 for generating a cable identification signal, and process 540 for sending the cable identification signal to the media device. As discussed in connection with <figref idref="f0002">Figures 2</figref> and <figref idref="f0003">3</figref>, these various processes are performed, in one exemplary implementation, by micro-controller 210. That is, process 510 may include powering the internal circuitry of the cable including micro-controller 210 and authentication coprocessor 220 upon connecting the cable to media device 320 (or to an accessory) using, for example, power supplied from media device 320. After power-up, process 520 may include micro-controller 210 identifying the cable type. The identification of cable type by process 530 may involve micro-controller 210 detecting a signal level on identification wire 230. Alternatively, micro-controller 210 can detect the cable type by the configuration in which the cable is being used and the type of accessory 320 to which it is connected. Next, process 530 may include micro-controller 210 generating an identification signal and then, process 540 may include sending the identification signal to media device 310. The identification signal may include cable preferences. In response, media device 310 may use the identification signal and automatically start transmitting audio and/or video signals to the cable apparatus 100 according to preferred or required signal formats.

0031Alternatively, media device 310 may use the identification signal and narrow its displayed menu choices (e.g., showing only the video files that are available in component format). In one example, the identification signal may instruct the media device to transmit audio signals but no video signals to the cable apparatus, and/or may also specify the type of audio signals that is preferred or required by the cable apparatus. In another example, the identification signal may instruct the media device to transmit both audio signals and video signals to the cable apparatus. Additionally, the identification signal may also specify the preferred or required type of audio signals, and/or specify the preferred or required type of video signals. For example, the type of video signal may be composite, component, digital audio, S-video, HDMI, etc. In one embodiment, the type of video signals that is preferred or required by the cable apparatus may be component video signals (e.g., Y, Pb, Pr signals). Accordingly, this method provides for a smart cable that includes all the resources to automatically identify the cable type and send cable preferences to the media device upon connection to the media device.

0032<figref idref="f0006">Figure 6</figref> is a flow diagram depicting method 600 of cable identification and authentication according to another embodiment of the present invention. Method 600 essentially combines methods 400 and 500 providing for a smart cable that can automatically perform both the identification and authentication processes upon connection to a media device. Referring to <figref idref="f0006">Figure 6</figref>, method 600 may include process 610 for powering up the cable circuitry upon connection to a media device (or an accessory). The method may also include process 620 involving the cable circuitry identifying a cable type, and process 630 for the cable circuitry generating and transmitting a cable identification signal to the media device.

0033Next, in response to a request from the media device to initiate the authentication process, method 600 may also include process 640 whereby the cable circuitry starts the authentication algorithm and generates an authentication response. Process 640 is followed by process 650 which may include sending the authentication response back to the media device. If the cable authentication is successful (process 660), the cable then may send its preferences to the media device (process 670) after which media content may be communicated over the cable (process 680). The cable preferences may include, for example, enabling audio and/or video line out, etc. If authentication fails, method 600 may include process 690 whereby the authentication processes (640 and 650) are repeated a predetermined number of times (n) before rejecting the cable as unauthorized. The details of operation of the authentication process and the cable identification process have been described above in connection with <figref idref="f0004">Figures 4</figref> and <figref idref="f0005">5</figref> and will not be repeated. It is emphasized here, however, that each of the process flow diagrams depicts an exemplary embodiment and modifications and alternatives are possible. For example, the identification process and or the authentication process may occur with or without an inquiry from the media device. For example, in one embodiment, the process (630) whereby the cable identifies its type to the media device may include the cable also requesting to be authenticated. In response to this request from the cable, the media device may send an authentication request signal to the cable initiating the cable authentication process. Also, the various authentication processes 640 and 650 may occur before, after or concurrently with identification processes 620 and 630.

0034In one embodiment, the authentication processes 640 and 650 may occur first and, depending on the result of the authentication challenge, the remaining processes may proceed or may be halted. According to this embodiment, if the cable apparatus transmits the expected authentication response, media device 310 may confirm that the coupled cable apparatus is an authorized cable allowing further processes including the cable identification process to continue. If, however, no authentication response is received or if incorrect authentication response is received, the media device may be prevented from transmitting data through the attached cable apparatus, and subsequent processes cannot proceed.

0035In all of the various embodiments described above, communication between the cable apparatus, the media device and the accessory can be based on any one of a variety of interface protocols. One example of such an interface protocol is the iPod Accessory Protocol developed by Apple Inc. that can facilitate communication between an iPod or iPhone and accessories via a smart cable apparatus according to the present invention. This particular protocol is described in greater detail in commonly assigned <patcit id="pcit0006" dnum="US7293122B"><text>U.S. Patent Number 7,293,122</text></patcit>, entitled "Connector Interface System Facilitating Communication Between a Media Player and an Accessory," to Schubert et al., which is hereby incorporated by reference in its entirety. Also, one example of the type of connector suitable for connector 110 over which the above-referenced interface protocol can be communicated is described in the above-referenced patent application number <patcit id="pcit0007" dnum="US11650330B"><text>11/650,330</text></patcit> (Attorney Docket No. 20750P-002400/P4998), titled "Backward Compatible Connector System," by Murphy et al., which in addition to the PCB inside the boot structure also describes, as shown in <figref idref="f0007">Figure 7</figref>, a specific number of pins (e.g., 30) and signal assignments for those pins that facilitate the protocol, all of which is incorporated by reference.

0036An exemplary embodiment of the present invention provides claim 10: A cable apparatus comprising: a first connector including a housing, a plurality of contacts, and one or more processing components, the plurality of contacts being configured to couple to a first electronic device; a cable coupled to the first connector; and one or more second connectors coupled to the cable and configured to couple to one or more second electronic devices; wherein the one or more processing components are configured to identify a type of the cable apparatus, generate an identification signal, and send the identification signal to the first electronic device through the plurality of contacts, wherein the identification signal identifies what types of signals the cable apparatus can carry.

0037Another exemplary embodiment of the present invention provides 11. The cable apparatus of claim 10 wherein the one or more processing components include a micro-controller coupled to an identification circuit.

0038Another exemplary embodiment of the present invention provides 12. The cable apparatus of claim 11 wherein the micro-controller is further configured to detect a signal level supplied by the identification circuit and to determine the type of the cable apparatus based at least on the detected signal level.

0039Another exemplary embodiment of the present invention provides 13. The cable apparatus of claim 12 wherein the signal level supplied by the identification circuit is predetermined.

0040Another exemplary embodiment of the present invention provides 14. The cable apparatus of claim 10 wherein the one or more processing components include a micro-controller that is configured to determine the type of the cable apparatus based on detecting which of the one or more second connectors are connected to respective one or more second electronic devices.

0041Another exemplary embodiment of the present invention provides 15. The cable apparatus of claim 10 wherein the types of signals the cable apparatus can carry can be one or more from among a plurality of signal types including composite video, component video, S-video, HDMI or other digital video formats.

0042Another exemplary embodiment of the present invention provides 16. The cable apparatus of claim 10 wherein the one or more processing components are further configured to receive an authentication inquiry from a the first electronic device through the plurality of contacts, to generate an authentication response, and to send the authentication response to the first electronic device through the plurality of contacts.

0043Another exemplary embodiment of the present invention provides 25. A method for identifying a cable apparatus, the method comprising: the cable apparatus detecting a signal level on an identification wire inside the cable apparatus; the cable apparatus identifying a cable type based on the detected signal level on the identification wire; and the cable apparatus sending to an electronic device, a cable identification signal based at least in part on information associated with the identified cable type, wherein, the identification signal is associated with one or more types of signals related to the cable apparatus.

0044Another exemplary embodiment of the present invention provides 26. The method of claim 25 wherein the identification wire is coupled to a resistor.

0045Another exemplary embodiment of the present invention provides 27. The method of claim 25 wherein the identification wire is coupled to a resistor divider.

0046Another exemplary embodiment of the present invention provides 28. The method of claim 25 further comprising the cable apparatus receiving an identification request from the electronic device.

0047Another exemplary embodiment of the present invention provides 29. A method of identifying types of electronic device coupled to a cable apparatus, the method comprising: the cable apparatus detecting a type of first electronic device to which it is connected through a first connector by applying one or more test signals to one or more pins of the first connector; the cable apparatus identifying a cable type based on one or more signals returned in response to the one or more test signals applied to the first connector; and the cable apparatus sending to a second electronic device, a cable identification signal based at least in part on information associated with the identified cable type.

0048Another exemplary embodiment of the present invention provides 30. The method of claim 29 further comprising: the cable apparatus detecting a type of second electronic device to which it is connected through a second connector by applying one or more test signals to one or more pins of the second connector; the cable apparatus identifying a cable type based on one or more signals returned in response to the one or more test signals applied to the second connector.

0049Another exemplary embodiment of the present invention provides 31. The method of claim 29 further comprising the cable apparatus receiving an identification request from the second electronic device.

0050Another exemplary embodiment of the present invention provides 32. A method of operating a cable apparatus, the method comprising: an identification method comprising: receiving power from an electronic device; and without receiving a request for a cable identification signal from the electronic device, sending to the electronic device a cable identification signal based at least in part on information associated with an identified cable type; wherein the identification signal is associated with one or more types of signals related to the cable apparatus; and an authentication method comprising: the cable apparatus receiving an authentication inquiry from an electronic device; the cable apparatus processing the authentication inquiry by an authentication circuitry; the authentication circuitry generating an authentication response that is associated with whether the cable apparatus is an authorized accessory for the electronic device; and the cable apparatus sending the authentication response from the cable apparatus to the electronic device.

0051Another exemplary embodiment of the present invention provides 33. The method of claim 32, the identification method further comprising: the cable apparatus detecting a signal level on an identification wire inside the cable apparatus; and the cable apparatus identifying a cable type based on the detected signal level on the identification wire.

0052Multiple aspects of the present invention have been described in the context of specific embodiments for illustrative purposes only. Those skilled in the art will appreciate that various alternatives, modifications or changes are possible. The above description should therefore not be limiting of the scope of the present invention, which should instead be determined by the following claims and their full breadth of equivalents.