Autodiagnostic system for cellular telephony

The present invention relates to a method and apparatus for testing a transceiver interface block in a cellular communication system.

Known from U.S. Patent Nos. 4,658,096 and 4,737,975, cellular interface systems in which the interface block connects a standard telephone set, facsimile, modem or other telecommunications equipment with a transceiver cellular device, the interface block enabling normal operation of the telecommunications device by a radio transceiver. The interface block can also convert DTMF or pulse type dial signals into a digital format, transmitted to the radio transceiver, so that the dialed number can be used to call the number by the radio system via the transceiver.

The use of diagnostic and testing equipment for entire cell systems is also known. It is also known to use a self-contained, self-testing block. The latter is described in U.S. Patent No. 5,016,269, which describes an emergency cell phone box. This patent describes the self-diagnostics performed by the junction box itself. The connection box provides self-diagnostics and periodically reports the status of the checked position to the central station via the cellular network. This patent specification describes a cellular apparatus and transceiver as well as an auto-diagnostic system assigned to it for checking the system and sending reports back to a central station. However, this patent does not cover the monitoring and self-diagnostic functions of the DTMF transducer, for example used in the above-mentioned US Patent Nos. 4,658,096 and 4,737,975.

These known solutions generally refer to wireless personal communication telecommunication systems with many intelligent base stations and inteligen4

173 533 portable handset telephony terminals, each of which has a predefined radio cell coverage area, and in particular refer to personal digital telecommunications cellular systems (PCS) with a full ISDN interface, enabling direct connection and commutation of PCS connection traffic via the ISDN interface and public commutated telephone network or any other switched network, whereby the personal telecommunication system has telephone and data capabilities, video (or any combination thereof) and set up two-way full duplex inbound and outbound connections, and at the same time it is completely operational and fully compatible with any selected type of modulation. In addition, the intercellular takeover protocol implements distributed logic, implemented in the form of software in intelligent mobile handset terminals, intelligent base stations and a public switched telephone network or any switched network equipped with a control database of PCS services.

The increasing availability of mobile and mobile telecommunications frees professional and residential subscribers from the physical limitations of a fully wired telecommunications network. In particular, cellular telecommunications systems, together with notification and other complementary services, ensure full mobility of telecommunications services. Significant technical progress in the field of mobile and portable equipment, as well as new methods, such as digital transmission in wireless telecommunications, have significantly expanded the number and types of wireless telecommunications services using radio spectrum available to the user. These forward-looking services include, but are not limited to, extended forms of mobile telephony services, extended digital wireless telephony services, support for portable fax devices, and wireless local area network support, and can be used by an existing public switched network or by alternative wired local networks, such as systems cable television. As such, digital personal telecommunications systems can exist independently or in cooperation with local wired networks, bridging the gaps in existing telecommunications systems, also creating new markets, many of which are yet to be shaped. The appearance of PCS will have a major impact on the future development and configuration of all telecommunications systems by significantly improving their flexibility and functionality. Accordingly, PCS service providers will have the opportunity to enrich and service existing and new domestic markets in an economic and responsible manner.

The requirements for personal telecommunications systems change rapidly as demand for instant telecommunications increases, as a result of increased mobility of subscribers. One of the advantages of PCS is that it can use a single telecommunications device to enrich the possibilities of reaching each person, anytime, anywhere. PCS gives the user the opportunity to increase mobility and flexibility, because this approach solves the basic problem of being in constant communication with the subscriber. PCS by radio will provide subscribers with connectivity without losing an important connection, as well as reducing the time and expense on return calls. PCS combine the functionality of the technique and infrastructure of radio devices and the Public Switched Telephone PSTN - Network and allow matching the possibility of supporting fully duplex connections (two-way incoming and outgoing connections) and interception between radio cells (enabling users to move freely from one radio cell to the second without interrupting the conversation). It is therefore important to remember that there is a constantly increasing demand for PCS services and technology for numerous, sometimes incompatible applications, namely wireless private indoor exchanges, smaller and lighter mobile cell phones, portable fax machines, multi-channel wireless phones and additional services aimed at is to enable individual users' data (not station data) to be contacted.

The current radio equipment and related services currently offered (i.e. cordless telephones, radio messaging and cellular communication) are not able to completely satisfy the demand for these new types of PCS services. For example, telephones

173 Wireless 533 are used inside and around the home or office, they work on a very small number of channels (for example, ten) and in densities and their use is limited to the immediate proximity of the assigned base station. Radio notification services are only one-way and have limited options. Cellular and specialized mobile radiocommunication services are not able to meet the full range of expected demand for PCS. Over time, PCS will have standardized equipment with common modules ensuring greater reliability of cooperating equipment, which will also be less sensitive to transient interference from external sources, will be equipped with the possibility of automatic call registration, automatic call forwarding, voicemail, the ability to receive faxes, the ability to change location install, remote data transfer, increased scope of privacy protection / caller identification / qualified services, increasing battery life and common protocols. In order to best accomplish this task, the use of digital PCS becomes a necessity. Wireless PCS can eliminate the need for wired buildings for telecommunications. Generally speaking, PCS will provide additional capabilities for telecommunications equipment. Digital PCS will ensure the improvement of telecommunications equipment, telecommunications systems and structures.

The essence of the method of testing the transceiver interface block in a cellular communication system, according to the invention, in which the signals in the interface block are processed for DTMF signals or pulse dial signals from a portable telephone attached to it, to a digital data format for transmitting digital data to a cellular device the transceiver is that a diagnostic block is attached to the cellular interface block in place of a portable telephone and that the functions generated by the portable telephone are generated in the diagnostic block to generate specific specific responses in the cellular interface block, and then the functions performed by the cellular interface block are checked and it is determined whether the cellular interface block is working properly.

Preferably, according to the invention, during the generation of the function, a handset pick up signal is generated and then the presence of a dial tone generated by the cellular interface block is detected in response to the handset pick up signal.

It is also advantageous if, according to the invention, a DTMF signal is generated during the function generation, wherein the DTMF output signal is detected by the cellular interface block in response to the generated DTMF signal.

Further advantages of the invention are obtained when, during the generation of a function, a hang up signal is generated, then the presence of a telephone connection entering the transceiver is simulated to activate the cellular interface block of its ring generator and to detect the ring signal it generates, and generates the handset pick up signal when the cellular interface block generates a ring signal, to be determined, whether the cellular interface block correctly disconnects the ringing signal after answering the input telephone connection, and then an outgoing telephone connection is generated via the cellular telephone network when the cellular interface block is connected to the transceiver and back to the cellular transceiver, during the generation of an outgoing telephone connection, the cellular transceiver makes a telephone connection with itself and then the generation of a busy signal by the cellular transceiver is detected in response to this telephone connection.

The essence of the device for testing the transceiver interface block in a cellular communication system, according to the invention, to which a portable telephone apparatus is attached, wherein the cellular interface block is capable of converting DTMF signals or pulse signals from a portable telephone apparatus attached to it into a digital data format for transmitting digital data to a cellular transceiver, that is, that it contains diagnostic systems for controlling and determining

173 533 proper operation of the cellular interface block and a relay-connected relay for attaching the cellular interface block in place of a portable telephone apparatus, wherein the diagnostic systems include systems for generating functions performed by a standard telephone apparatus to generate individual responses in that cellular interface block in the cellular interface block.

Preferably, the system for generating functions of a standard telephone set includes a system for generating a DTMF signal and transmitting this signal to a cellular interface block, the diagnostic systems comprising a system for detecting the output of the DTMF signal by the cellular interface block in response to the DTMF signal generated by the TDMF signal generating system.

It is also beneficial if the diagnostic systems include simulations of the presence of a telephone connection entering the transceiver to be activated by the cellular interface block of its ring generator, wherein the diagnostic systems further include a ring detection system with an optoisolator system for detecting the ring signal generated by these systems .

It is furthermore advantageous if the diagnostic systems include systems for generating an outgoing telephone connection through the cellular telephone network, when the cellular interface block is connected to the transceiver, and back to the cellular transceiver after which these diagnostic systems cause implementation by the cellular device transceivers of telephone connections with themselves, wherein the diagnostic systems further include a busy signal detection system by the cellular transceiver in response to this telephone connection, and the systems for generating the outgoing telephone connection call the number of the telephone apparatus that has been assigned to the transceiver attached to the cellular interface block.

An advantage of the solution of the present invention is that it can be used in any cell type system, e.g., cellular system or in cell-like systems, e.g. ISDN or other personal telecommunication systems, using a cell-like adapter block or interface . used to process DTMF dial or pulse dial signals into a digital format for delivery to a cell-like transceiver connected to a cell-like system.

The solution according to the invention, intended for use in cellular interface blocks and systems known in the prior art, can be used with other radio transceivers, e.g. IMTS, where a wireless connection between the base station and main stations is used, whose transmitters are connected to the blocks interface devices that enable connection and normal operation of a telecommunications type device, e.g. a landline telephone, facsimile, modem, etc., with a radio transceiver. The interface block performs a number of functions depending on its intended use. For example, in specialized alarm systems, where the radio transceiver only performs outgoing calls, the interface block does not need to generate ringing, busy signal generation, etc., transmitted to the telecommunications device. In contrast, in systems where only incoming connections are required, the interface block does not need to convert DTMF dial signals or pulse type to digital format. According to this solution, software is used that has access to the microprocessor of the cell interface block or the radio interface block of the transceiver system, wherein the software can be started either manually or automatically to activate the testing device. The software diagnoses the proper functioning of all software and hardware systems.

You can check each of the individual items. For example, in the interface block the DTMF converter can be checked, the interface from four wires to a two-wire connection, the busy tone software can be checked, as well as other features characterizing the operation of the interface. In addition, the transceiver, battery, and even any other interface parameter can be checked. The maintenance system has the ability to make a connection via the cellular network to a given telephone number of the base station, whereby the central station can then either send a return tone or dial the current interface system number to retrieve the busy signal. This can be considered a certain test. It is also possible to send a different telephone number by the cellular system to call the same or a different central station, so that a precise reverse tone (1000 Hz) can be sent, and the software can compare this 100 Hz tone with its own configuration to determine whether there is a line connection and the cell system is functioning properly. The solution is particularly useful because it allows the end subscriber to activate the phone in case the subscriber is convinced that he is having trouble with this phone. This test informs the telephone company about the occurrence or not of the occurrence of an irregularity in the cellular system exchange or about a problem in the end subscriber base unit.

The solution uses two different circuits. The first one is a teleconservation circuit and the second is a passing circuit. The teleconservation circuit generates a multiple test that involves making a phone call to a specific number. The system reports the test results under this specific number. The system can connect when dialing its own number to ensure, by receiving a busy signal, that the block reception and transmission are working properly. These test teams can be initiated by the subscriber by pressing the button in the block. After pressing the button, the LED near the button starts flashing continuously, identifying the test being performed. If the LED remains on at the end of the test, it indicates that there is a problem with this block. This test takes no more than 40 seconds in total. On the other hand, if the LED stops flashing and turns off, it indicates that the test was successful and that the block is OK with respect to the position checked in the test. In the additional option, it is possible to conduct a test from an external number, in which the transceiver works correctly by receiving the phone number.

The operation of the second circuit is that it uses a pass signal from the cellular system and generates appropriate pass pulses for a standard home telephone or payphone. The device interprets the incoming signal from the cellular system and does not require local tariffing. It works in a similar way as in the generation of second tones. It can be used in any cellular system capable of sending pass signals.

The subject of the invention is shown in an embodiment of the drawing, in which Figs. 1A and 1B are a flowchart of the self-testing process, Fig. 2 is a flowchart of the hang-up self-test subroutine, Fig. 3 is a flowchart of the self-test dial tone generation subroutine, Fig. 4 is a network Figures 5A, 5B and 5C of the DTMF signal generation test sub-program of the self-testing routine of the ring generation, Fig. 5A, 5B and 5C 6 is a flowchart of the self-testing subroutine process of the ringing response process, Figures 7A and 7B are a flowchart of the call test subroutine that checks the correctness of the call detection and response to an incoming call, Figures 8A and 8B - the flowchart of the error code subroutine, Fig. 9 flowchart of the reset subroutine, Fig. 10 - block diagram of the testing device, and Fig. 11, 12, 13 and 14 show circuit diagrams for implementing the simulation of tested events.

The call of the operational test sequence is made by pressing the self-diagnosis button and then the control of the interface block 14 is transferred to the main self-diagnostic subprogram of the testing device 10 for self-testing.

Figures 1A and 1B show the test subroutine, i.e. the main self-diagnostic subroutine. A number of connections are made with various test procedures. After each subroutine, error flags are checked. If any abnormality occurs, the test sequence stops. The status is then coded and the result is presented to the user via four LEDs as described below.

173 533

As shown in Figure 1A, in Step 1, the operational test sequence begins with the initialization of variables and flags. In step 2, the program calls the hanging test subroutine. In the hanging test subprogram, the user's telephone is disconnected from the search and calling line, in place of the interface block, a testing device is attached, described in detail below. In step 3, you check whether an error is detected in the hanging test subprogram. If an error is detected, the test sequence is suspended and the program proceeds to step 14 in Fig. 1B. However, if no error is detected, the program calls the dial tone test subroutine in step 4. In step 5, the dial tone error occurs. If an error is detected, the test sequence is suspended and the program proceeds to step 14 of Fig. 1B. However, if no error is detected, the program calls the next test - the DTMF test subroutine in step 6. The program is continued in step 7 of FIG. 1B, where the result of the DTMF subroutine is checked. If an error is found, the test sequence is suspended and the program proceeds to step 14. If no error is detected, the program then calls the next test, the subroutine test subprogram in step 8. In step 9, a check is made for the occurrence of a ringing error. If an error is detected, the test sequence is stopped and the program goes to step 14. If, however, no error is detected, the program calls the next test, the call response test subroutine in step 10. In step 11, the error response is checked for for calling. If an error is detected, the test sequence is stopped and the program proceeds to step 14. However, if no error is detected, the program proceeds to the connection setup subprogram in step 12. In step 13, a check is made for a calling error. If an error is detected, the test sequence is stopped and the program goes to step 14. If no error is detected, the program goes to the Fin_Self test subroutine in step 15. If an error is detected during the execution of the subprogram, the program goes to step 14 . In step 14, the program calls the subroutine connection error. Eventually, the sequence ends after deleting all variables and flags in step 15, returning control to the telephone device, and performing normal operation of the interface block 14.

From the figures 2 to 9 below, the individual test programs mentioned above are explained in detail.

The suspension test subprogram shown in Fig. 2 (step 2 of Fig. 1A) begins with the initialization of variables and flags in step 16. In step 17, the program clears all LED input signals. In step 18, the user's telephone is disconnected from the search and calling line of the interface block 14, while in step 19 the testing device 10 is switched on in place of the telephone. Step 20 brings a time delay ensuring a sufficiently long response time sufficient for this connection. At step 21, the testing device simulates and generates hang-up. Step 22 provides a time delay sufficient to take the handset off the hook. In step 23, the program checks the condition of the fork of the interface block 14, which is now attached to the testing device 10. In step 24, the suspension is checked. If no hangup is detected, the program proceeds to step 25, where the Error_Flag flag is set and the Main_Flag_Error flag is set. However, if no error is detected, the program continues until step 23, where the dial tone is unlocked, as shown in Fig. 3. Finally, the subprogram ends and the program returns to the main subprogram of Figures 1A and 1B.

The dial test subroutine shown in Fig. 3 begins with the initialization of variables and flags in step 27. Step 28 provides the time delay needed for proper tone dialing. In step 29, the dial tone is tested. If the dial tone is incorrect, the program proceeds to step 30, where the Error_Flag flag is set and the MAIN_FLAG_ERROR flag is set to 3. However, if no error is detected, the program proceeds to step 31, from where the program returns to step 29, testing the dial tone over at least 711 ms. If no error has occurred and 711 ms have passed, the subprogram ends and the program returns to the main subprogram of Figures 1A and 1B.

The DTMF test subroutine shown in Fig. 4, which checks the correctness of the conversion to digital data using interface block 14, begins with blocking the tone in step 32

173 533 selections from the previous test subroutine. Step 33 sets the first DTMF tone to 0. In step 34, the testing device 10 sends the DTMF tone corresponding to this value. Step 35 implements a time delay providing sufficient time to complete the inclusion. In step 36, the DTMF tone is blocked. Step 37 implements a time delay enabling the interface to detect DTMF tone pulses. In step 38 of the interface block 14 it reads the tone. In step 39, the received DTMF tone is checked. If the DTMF tone is not the same as the received DTMF tone, or if the DTMF tone is not received, the program proceeds to step 40, where the Error_Flag flag is set and the MAIN_FLAG_ERROR flag is set to 4. However, if the DTMF tone is the same , the program goes to step 41 and the next DTMF digit is selected. At step 42, the program checks whether all DTMF tones have been tested. Otherwise, the program returns to testing the next digit. Finally, after testing all DTMF tones, the subprogram ends and returns to the main subprogram of Figures 1A and 1B.

Figures 5A and 5B show the subroutine of the ringing test. This subroutine tests the timing of the two ringing pulses generated by the ringing systems of the interface block 14. As can be seen in Fig. 5A, the subroutine starts with the initialization of variables and flags in step 43. In step 44, the testing device 10 generates the hang up. Step 45 is a time delay enabling the interface block 14 to detect the hang up. In step 46, the interface block 14 is set to make sure that an inbound connection is being made. Thus, interface block 14 generates its calling sequence. The purpose of steps 47 to 53 is to verify the start of ringing in the next 2s and not detecting the removal of the handset from the hook. In step 47, the time block is deleted. Step 48 checks the photo of the handset, and if a photo of the handset is detected, the test stops and the program goes to step 49 in fig. 5C to indicate an error. On the other hand, when the receiver hangs up, the program proceeds to step 51, in which the testing device 10 checks the ringtone activity. In step 52 checking if the ringing starts. If the ringing has started, the program proceeds to step 54 shown in Fig. 5B. However, if the ringtone has not ringed yet, the program checks the time block in step 53. If this time is less than 2s, then the program returns in a loop to step 48, until ringing begins. Conversely, if the 2s time has expired, the test is aborted and the program proceeds to step 49 according to Fig. 5C to signal an error as shown in Fig. 5B. Step 54 brings a time delay. The purpose of steps 55 to 59 is to verify that the bell rings for at least one period of 1.3 seconds, and that no pick-up is detected. In step 55 the time block is deleted. In step 56 suspension is checked. If pick-up is detected, the test is stopped and the program proceeds to step 49 of Fig. 5C to signal an error. Conversely, if hanging off is detected, the program proceeds to step 57, in which the testing device 10 checks for bell activity. In step 58, you check whether the ringing has been stopped. If ringing has been stopped, the program checks the time block in step 59. If the time block works less than 1.3 s, the program returns in a loop to step 56 until ringing stops. Conversely, if the time has expired, the test is stopped and the program proceeds to step 49 of Fig. 5C. The purpose of steps 60 to 62 is to check that the ringtone rings for no longer than

2.5 s. At step 60, testing device 10 checks for ringtone activity. In step 61 check whether the ringing has stopped. If so, the program proceeds to step 63 of Fig. 5C. However, if the ringing has not stopped, the program checks the time block in step 62. If the time block shows less than 2.5 seconds, the program returns in a loop to step 60 until the ring stops. However, if the time has run out, the test is stopped and the program jumps to step 49 of Fig. 5C.

The purpose of steps 63 to 65 in Fig. 5C is to verify that no pick-up is detected during the 2s period. In step 63, the time block is deleted. In step 64, hang up the handset. If pick-up is detected, the test is stopped and the program goes to step 49 to signal an error. If no pick-up is detected, the program checks the time block in step 65. If the time block shows less than 2 seconds, the program returns to step 64, up to

173 533 start ringing. However, if the time has run out, the program proceeds to step 66, in which it checks how many cycles of this subroutine the ringing was checked. If the call was checked only once, the program proceeds to step 67, where the Ring_Second flag is set. The program then returns to step 47 to check the ringing for the second time. However, if the ringing was checked twice, the test is stopped and the program returns to the main subprogram. If an error was detected during any part of the read test subroutine, the program proceeds to step 49. In step 49, the incoming connection is cleared and the calling sequence is terminated. Then the program goes to step 50, where the Error_Flag flag is set and the Main_Flag_Error flag is set to 5. Then the subprogram ends and the program returns to the main subprogram.

Fig. 6 shows a subroutine of the ringing response test. This subroutine checks the response of the interface block 14 when a pick-up is reported to it in the ringing cycle when the telephone answers to an incoming call. The purpose of steps 68 and 69 is to verify that a ringing will begin within the next 2s and that no pick-up is detected. In step 68 the time block is deleted. In step 69 hanging up the handset is checked. If the handset hang-up is detected, the test is stopped and the program goes to step 73. However, if the hang-up is detected, the program continues with the active bell. In step 71, the ringing check is checked. If the ringing has started, the program proceeds to step 74. However, if the ringtone has not yet ringed, then in step 72 the program checks the time block. If the time block shows less than 2 seconds, the program returns in a loop to step 65, waiting for the ring to start. However, if the time above 2s has elapsed, the test is stopped and the program goes to step 73. In step 74, the testing device 10 generates a handset pick up signal. Step 75 is a time delay enabling the interface block 14 to detect the pick up of the handset. In step 76, the interface block 14 checks the status of the forks. If no pick-up is detected in step 77, the test stops and the program goes to step 73. However, if the interface block 14 detects a pick-up, the program goes to step 78. If an error is detected during any part of the ringing test subroutine, the program jumps to step 73, where the Error_Flag flag is set and the Main_Flag_Error flag is set to 6. Then the program proceeds to step 78. In step 78, the incoming call is cleared and the interface block 14 suspends the calling sequence. Then the subprogram ends and the program moves to the main subprogram.

Figures 7A and 7B show the subroutine of the ringing test. This subroutine checks the cellular or transceiver attached to the interface block 14 by checking at the beginning of the power supply and then generating a connection to its own telephone number. In Fig. 7A, step 79 checks if the power of the transceiver is turned on. If not, the Main 1_Flag_Error flag in step 81 is set to 1, then the program proceeds to step 93 in Fig. 7B. In contrast, if the power is on, the program proceeds to step 92, in which the interface block 14 requests the telephone number from the transceiver and retrieves it. Step 83 introduces a time delay that allows the transceiver to respond. In step 84, the interface block 14 generates a call to its own telephone number. Step 85 is a time delay allowing connection between the cellular network and the transceiver. In step 86, the interface block 14 detects the transceiver status. In step 87, the connection status takes place. If this is not a working state, the Main1_Flag_Error flag in step 88 is set to 4, and then the program proceeds to step 93 in Fig. 7B. However, if the transceiver is in the operating state, the program proceeds to step 99 of Fig. 7B. As shown in Fig. 7B, the testing device 10 checks the busy tone in step 89. If a busy tone is detected in step 90, the program proceeds to step 93 to indicate that everything is working correctly. However, if no busy tone is detected, the program continues to step 91, where the time block is checked. If the time block shows less than 18.2 s, the program returns to step 86. This ensures

173 533 more time for the cellular network to send back busy responses. However, if the time has already elapsed, the program proceeds to step 93, in which the Main1_Flag_Error flag is set to 3. In step 93, the interface block 14 sends the end connection signal to the transceiver. Then the testing device 10 signals that the handset is hung up to the interface block 14, in step 94. The program ends and returns to the main subroutine.

The task of part of the subroutine of Figures 8A and 8B is to generate the ERROR_CODE code based on the previously described error flags in such a way that the results can then be output via LEDs. As shown in Fig. 8A, the subroutine begins checking the value of one of the two error flags, the Main_Flag_Error flag. In step 95 it is checked if Main_Flag_Error is equal to 1, i.e. corresponds to Hook Slic Error. If so, ERROR_CODE is set to 1 in step 96, then the program returns to the main subprogram. However, in case of a negative result, the program proceeds to step 97. In step 97, check is made whether Main_Flag_Error is equal to 2, i.e. it corresponds to a calling error when hanging up. If so, ERROR_CODE is set to 1 in step 96, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 97. In step 97, check is made whether Main_Flag_Error is equal to 2, i.e. it corresponds to a calling error - hanging up. If so. then ERROR_CODe is set to 2 in step 98, and then the program returns to the main subroutine. However, if the result is negative, the program proceeds to step 99. In step 99, it is checked if Main_Flag_Error is 3, i.e. it corresponds to a dialing error. If so, ERROR_CODE is set to 3 in step 100, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 101. In step 101, check is made whether Main_Flag_Error is 4, i.e. it corresponds to a DTMF tone error. If so, ERROR_CODE is set to 4 in step 102, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 103. In step 103, check is made whether Main_Flag_Error is equal to 5, i.e. it corresponds to a call detection error. If so, the ERROR_CODE code is set to 5 in step 104, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 105. In step 105, check is made whether Main_Flag_Error is equal to 6, i.e. it corresponds to the answer to the ringing error. If so, the ERROR_CODE code is set to 6 in step 106, and then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 107 according to Fig. 8B. In fig. 8B, the subroutine starts checking the value of the second error flag, Main1_Flag_Error. In step 107, it is checked if Main1_Flag_Error is equal to 1, i.e. it corresponds to the error of the radio part supply. If so, the ERROR_CODE code is set to 7 in step 108, and then the program returns to the main subprogram. However, if the result is negative, the program proceeds to step 109. In step 109, it is checked if M.ain1_Flag_Error is equal to 2, i.e. it corresponds to a calling error. If so, the ERROR_CODE code is set to 8 in step 110, and then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 111. In step 111 it is checked if Main1_Flag_Error is equal to 3, i.e. it corresponds to a busy tone error. If so, the ERROR_CODE code is set to 9 in step 112, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 113. In step 113 it is checked if Main 1_Flag_Error is equal to 4, i.e. it corresponds to a device operating error. If so, the ERROR_CODE code is set to 10 in step 114, then the program returns to the main subprogram. However, in the case of a negative result, the program proceeds to step 115. In step 115 it is checked if Main1_Flag_ErrOr jt ^ s ^ t equal to 5, i.e. it corresponds to a 1000 Hz error. If so, the ERROR_CODE code is set to

173 533 step 116 to value 11 and returns to the main subroutine. However, in case of a negative result, the program returns to the main subroutine.

Fig. 9 shows the FIN_SELF test subroutine whose purpose is to reset the interface block 14 to ensure its normal functioning and to indicate the end of the test by lighting the LED four times. The subprogram begins with step 117, in which the testing device 10 generates a handset hang-up signal. In step 118, all variables and error flags are deleted. In step 119, all LEDs turn off. Step 120 brings a time delay. In step 121 all LEDs are turned on. Step 122 brings a time delay. Step 123 allows the loop to be closed to step 119 so that the LEDs are turned on four times. Finally, in step 124 all LEDs are turned off and then the program returns to the main subroutine of Figures 1A and 1B.

The solution according to the invention is described below, with reference to the following figures, description of individual circuits used to perform the self-test described above, and documentation of the program for performing the operations detailed in the description.

Figure 10 shows a block diagram of the testing device 10. The testing device 10 is installed in the cell adapter system and is intended to initiate the process of automatic testing of the telephone function when the telephone subscriber activates the button or during automatic testing at intervals of about 12 hours, in accordance with the networks of activities of Figs. 1A-9, as described in detail above. The final result of this self-test will be communicated to the user via an indicator in the form of LEDs, installed on the right wall of the cellular adapter, or similar to a cellular one. Device 10 has the ability to report test results to a free service center. This notification can be done by automatically connecting to a predefined service center number. This function requires that the service center is equipped with the system and program elements necessary to establish communication and to interpret received messages. The self-diagnostic test checks the correct operation of the cellular adapter, including its elements such as: basic interface block systems, cables between the radio part and the interface, transmission line, antenna, cellular transceiver, billing system and power source. The test device 10 is configured to call the same number assigned to the adapter transceiver when performing the test. The self-diagnostic test is programmed to detect a busy signal or congestion signal on the line as an indication that the connection cannot be made and that the transmission system is working properly.

The testing device 10 is intended for use in the cellular adapter block to check that the latter is working properly, without having to send technical staff to the place where the equipment is installed. The testing device 10 of the teleconservation system is powered directly from the cell interface block 14. The testing device 10 is not an autonomous system. Its operation depends on the control signals it receives from the supervisory system located in the cell interface block 14. The supervisory system compares the test results with the operating system parameters. The autodiagnostic system of test device 10 performs the following tests: answer errors (incorrect number) - test performed in two different ways, ringing voltage generates a call and detects the presence of ringing voltage generated by interface block 14, call response - checks that ringing stops after answering them, dial tone - checks for the occurrence of dial tone , the MFTD operation verifies that the interface block 14 correctly detects the tones received by the multi-frequency tone detector (MFTD), transceiver test, receive circuit test, transmit circuit test, pass system test - checks the frequency characteristics of pulses generated at 12 kHz, transceiver power supply, efficiency of the power supply system. These tests have been detailed above in the description of the flowchart of Figures 1A-9.

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The testing device 10 is connected to the conventional cell interface block card 14 via a 20-pin plug socket. The testing subroutine is initiated via a manual switch installed on the right side of the adapter box. After finding any abnormality in the operation of the telephone, such as the inability to hear the dial tone after picking up the receiver, the subscriber approaches the adapter box and presses the marked test button. The testing device 10 interrupts the connection of the subscriber's apparatus with the cell interface block 14 and carries out the self-diagnostic test sequence described above. The testing device 10 is programmed in such a way that it automatically initiates the testing program at intervals of about 12 hours from the moment the cell interface block 14 is switched on. With the automatic test initialization, the sequence of the outgoing test connection is not generated. After further development, you can ensure that the automatic test generation function is initiated from a remote site. This teleconservation function involves the modification of the operating software of the interface block 14 and additionally requires the development of new circuits and software of the testing device 10. After initiating the self-testing program, the orange indicator light (LED) flashes, indicating to the subscriber that testing is underway. Between subsequent tests there are pauses in flashing signaling lasting about 1s. The full test lasts approximately 40s. After the test, its result is shown by the remaining indicator light on. In this case, the problem may be related to the corresponding wired connection or the use of a telephone apparatus attached to the cell interface block 14. When the indicator is continuously lit, the cell interface block 14 returns to its operating conditions. In the event of damage to the cell interface block 14, this is determined on the basis of tests, and the light indicator remains clearly off. This indicates to the user that the damage has occurred in the cell adapter. Upon completion of the testing procedure, the cellular interface block 14 returns to its normal operating conditions, regardless of whether damage has been detected. The user can continue to use the adapter even with restrictions due to the detected damage.

The LED indicator in the cell interface block 14 can be used to identify the fault detected. This display helps the service technician who has access to the inside of the box to check the probable cause of the damage. The combination of on and off LEDs can identify the faults originally detected in the test. This combination remains lit during 60s after the test. A list of possible fault codes indicated by the LEDs on the cell interface block 14 is provided below.

If damage is detected as a result of the test, a connection to the teleconservation center may be initiated. After establishing communication, the detected damage is reported. This teleconservation function allows you to maintain a database for each block. If the test was started manually, using the button, the full result of the completed test, regardless of the detected damage, will be reported to the teleconservation center.

Below is the list of codes displayed on the LED table: 4.10 ERROR CODE

LLL error type

No damage

Loop error

Loop error

Dial tone

MFTD detector

Call detector

Answer the call

Transmitter power supply

Transmitter (connection) Receiver (busy)

Tone detection at 12 kHz

Main power supply

NO SERVICE

ED 5 ED 4 ED 3 ED 2

IN

Transmission circuit

WWWW

Y

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Not specified

Not specified

WWW Y_ _

Website

YY

The self-testing sequence is as follows. The first action carried out by the testing device 10 is to disconnect the subscriber's installation. Then the conditions of answering the subscriber's phone are simulated. Under these conditions, the correct loop detection is checked by generating a dial tone. Then the correct generation of the dial tone is checked in the minimum frequency and level range. Then the MFTD multi-frequency tone detector test begins. It consists of an autodiagnostic card generating a full sequence of 16 MFTD tones, sending it to a conventional cell interface block 14 in the cell adapter and checking the correct reception of these tones. Then a test is carried out to check the correct functioning of the ring generator. Ringing current is generated while checking its frequency and level within a specified minimum range. Then the conditions of the telephone response, i.e. the answer to the call, are simulated again to check the operation of the ringing system, which should be deactivated before the telephone answers. The next test detects the ability of the counting system to generate pulses with a frequency of 12 kHz, in the minimum frequency and level range, for cellular phone adapters. The pulses generated by the scoring system card are detected by the precision pulse detector in the testing device 10 in a known manner. For cellular system adapters that do not have a pass module, in this case the J1.3 connector of the cell interface block 14 is set to open. A jumper must be used for those blocks that have a pass module installed.

The next tests check the operation of the cellular transceiver. First, the power to the transceiver is checked. This test is performed by detecting the + 12V direct voltage received from the transceiver's data connector. Then the transceiver is checked, i.e. in conditions of cellular access services characterized by the lack of NO SERVICE signal. The presence of the NO SERVICE signal will be recognized as a fault. Such conditions can be caused by faulty detection, and not simply damage to the cellular transceiver. Then a connection is generated via the cellular network with the subscriber's number. In this way, the operation of the transceiver is checked by detecting the busy signal from the system, because self-calling is taking place. If you encounter congestion in the network, the transceiver will be informed about the conditions of PATH ENGAGED. The transceiver then generates a CONCESS (busy) tone. The presence of this tone is interpreted as the correct operation of the transceiver block, as is the busy signal. This tone is interpreted as the result of proper operation of the transceiver, in the same way as the busy signal. This test can only be carried out if the subprogram is initiated manually, for example by pressing a button. The test will not be carried out in blocks that initiate the process automatically. Then the power supply voltage is checked. If the DC voltage is less than 14.5 V, a damaged power source will be detected.

In Figure 10, the testing device 10 is connected to a standard cellular adapter or interface block 14. The testing device 10 is built of diagnostic systems used to perform the self-diagnostic tests described above. These systems are: Busy Signal Detector 16, used during the validity test

173 533 receiving a call made by the testing device 10 during the self-test described above, with a callback, shown in Fig. 7A, a 12,000 Hz detector system 18 used for testing, which checks the frequency parameters of pulses generated at 12 kHz. MFTD generator system 20 that generates DTMF signals processed by cellular interface block 14 as described above with reference to FIG. 4, a ringing signal detector circuit 22, used to detect the ringing signal generated by the cellular interface block 14, during the ringing test routine and ringing response described above with reference to Figures 5A and 6, the dial tone detector system 24 that checks the correctness of the generation a dialing tone through a cellular or similar cellular interface block 14 as described above with reference to Figs. 3, a voltage detector system 28 for checking the power supply of the transceiver and the entire device, and teleconstruction control block 30, which is a control block and which is also used for making connections and reporting to the central reporting station, self-test results. The actual configuration of each of the systems mentioned above in Figures 11, 12, 13 and 14 is described in more detail below.

Figures 11, 12,13 and 14 show diagrams of systems for carrying out simulations of the tests described above throughout the entire self-testing process. In fig; '. 11 shows the testing device 10. The part, schematically indicated in figure 11 by the letter A, is the place where the testing device 10 is connected to the search and ringing line of the conventional cellular interface block. The RELY1 relay is used to disconnect the user's telephone from the cell interface block 14 during the maintenance function test. Instead, the testing device 10 is connected to a search and calling line to perform these tests. When the test unlock signal is high, the transistor Q3 enters saturation and then powers the RELY1 relay by connecting the teleconservation system to the search and calling line. The simplified part of the system marked with the letter B in Fig. 11 is the subscriber's spade switch, whereby the subscriber's handset can be hung on the board in two possible ways. J1 is a two-terminal connector of a normal telephone socket P1.

The simplified part of the system marked with the letter C in Fig. 11 is the audio interface system used as the interface between the search and calling line and the audio line. T1 stands for telephone matching transformer. Its task is to maintain similar parameters of alternating and direct current for the telephone while realizing the reception and transmission of audio signals. Zener diodes D1 and D2 are used to eliminate all signals with voltages greater than +/- 4.5 V. An SSR1 optoisolator is also installed, which, in combination with the Q4 transistor, ensures that the search and calling lines are closed. When the loop connection signal is set to high, the Q4 transistor enters saturation, which powers the SSR1 optoisolator, closes the circuit and performs the function of removing the handset.

The simplified part of the circuit marked with the letter D in Fig. 11 is a ring detection circuit containing two integrated circuits: the U2 ring detection circuit and the U9 optoisolator ensuring the correct CMOS output level. An input signal is supplied to the U2 ring detection circuit when the ring voltage is present on the search and ringing lines. This signal is transformed by the U9 optoisolator system, which then generates an active low signal on the I / O line.

Part of the system in simplified designation marked with the letter E in Fig. 11 is a current loop detection system comprising another U17 optoisolator ensuring detection of the loop current. When this test is performed (the test unlock signal in Part A is high) and the handset is lifted (the loop connection signal in Part C is high), the search and ringing lines are shorted providing the handset lift current. This current is transformed by the U17 optoisolator to an active low level on the I / O line.

The simplified part of the circuit marked with the letter F in Fig. 11 is a set of input / output audio circuits built of a 1/4 integrated U1 operational amplifier.

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The main task of this circuit is to isolate and amplify the input audio signals. The output of this circuit is an audio input. Also in this case the DTMF output signal generated by the testing device 10 is forwarded to the search and calling line. This DTMF signal appears at the tone output.

The part marked schematically in Fig. 12 with the letter G is a DTMF signal generator, which is composed of the U4 circuit, generating the DTMF signal and 1/4 of the U1 integrated output amplifier. In order to generate the DTMF signal, a four-bit code value is first given to the input terminals marked DTMF 1 -OUT, DTMF2-OUT, DTMF3-OUT, DtMF4OUT of the U4 system. Then, by maintaining this four-bit value, the enabling signal on the input terminal labeled DTMF-OUT changes from low to high, thus enabling signal generation. The acoustic frequency is output to the tone output after signal amplification by the U1 amplifier. To turn off the tone, the signal on the DTMF-OUT terminal is brought back to low.

The part marked schematically in Fig. 12 with the letter H is the U8 integrated circuit of the I / O ports. This integrated circuit with input and output ports is used by the microcontroller of the cellular interface block 14 to read the input data and to control all output signals of the testing device 10. The J4 connector is a switch for the automatic periodic test providing a choice of 12 or 24 hours. J5 is used to enable automatic response to a call.

The parts marked schematically in Fig. 12 with letters I.1 and I.2 are power connectors, data connectors and control connectors. They include a J2 plug head with 2 x 10 contact pins used for power supply as well as for sending and receiving I / O port data. They also contain a J3 head with four contact pins used to signal the test status and an external button for manually activating the test. The part marked schematically in Fig. 12 is a power stabilizer and contains a U7, 5-volt unregulated positive voltage stabilizer, providing the voltage necessary for digital circuits.

The testing device 10 includes six individual tone detectors, used to test the audio path, frequency and timing of the ROH tone duration, dialing, occupancy and crowding. Each of the tone detectors consists of an operational amplifier and a separate tone detector. The operational amplifier input is connected to the audio input line. The detection frequency is set by means of a resistor and a capacitor, which are connected between the contact pins and ground. When the tone programmed by the resistor and capacitor circuit corresponds to a valid tone, the tone detector output signal changes from low to high.

Part K in Fig. 12 is a dial signal detector system. When a valid dial tone occurs at the input of the U3 dial signal detection circuit, the dial detection line is set to a low state. Part L is the volume signal detector system. When a valid volume signal is present at the input of the U6 volume detection system, the volume detection line is set to low.

Part M of Fig. 13 is a 400 Hz tone detector system. When a valid 400 Hz tone occurs at the U14 input, the 400 Hz tone detection line is set to a low state.

Part N of Fig. 14 is a 800 Hz tone detector system. When a valid 800 Hz tone occurs at the input of the Ul 3 integrated circuit, the 800 Hz tone detection line is set to a low state. Part O is a 1020 Hz tone detector system. When a valid 1020 Hz tone occurs at the input of the Ul 6 integrated circuit, the 1020 Hz tone detection line is set to a low state. Part P is a 12 kHz tone detector system. When a valid 12 kHz tone is present at the input of the U12, the 12 kHz tone detection line is set to low.

Part Q of Fig. 13 is a DTMF signal detector circuit consisting of a U13 DTMF signal detection circuit and a 1/4 integrated input amplifier Ul. When a valid DTMF signal is present at the input terminal, the DTMF-STROBE line is set to low and the U13 system detects the DTMF signal. After decoding the signal, the terminals marked DTMFO-IN, DTMF1EN, DTMF2-IN, DTMF4-IN are output

173 533 four-bit value detected. Then the DTMF-STROBE line is set to high again. Part R is a variable component monitor, including a U10 system, for detecting a voltage drop below 4.5 V. Resistors R17 and R33 are a voltage divider that increases the detection voltage of the U10 system from 4.5 V to 13 V. The system works on the assumption that when the supply voltage from the power supply comes on, 13 V occurs at the input of the test device 10 In the event of an AC power failure, the voltage drops to a battery backup level that does not exceed 13 V. This system detects a loss and sets the AC detection line to low.

Below is a printout of the source program for carrying out the invention.

<img file="PL173533B1_D0001.tif" />

Figure 1B

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STEP 16

STEP 17

STEP 18

STEP 19

STEP 20 (start)

INITIATE VARIABLES

<img file="PL173533B1_D0002.tif" />

FIND THE OPERATING MODULE

DELAY

STEP 21

STEP 22

STEP 23

STEP 24 NO

STEP 25 J

SET ERROR-FLAG MAIN FLAG ERR0R = 1

MODULE 08 SERVICES HEADPHONE PHOTOS | DELAY. UNLOCKING DETECTION

<img file="PL173533B1_D0003.tif" />

UNLOCK DIAL TONE (RETURN)

FIG. 2

173 533 (START)

STEP 27 J

RUN CHANGE ~ |

STEP 28 Γ | DELAY 1-

<img file="PL173533B1_D0004.tif" />

NO (return}

FIG.3

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<img file="PL173533B1_D0005.tif" />

FIG-4

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<img file="PL173533B1_D0006.tif" />

FIG. 5A

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<img file="PL173533B1_D0007.tif" />

FIG. 5B

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STEP 63

DELETE TIME BLOCK 1

STEP 49

<img file="PL173533B1_D0008.tif" />

STEP 50 (return)

STEP 64

LOOP! PHOTO HEADPHONES THROUGH 2S IS NOT PERMITTED

Figure 5c

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<img file="PL173533B1_D0009.tif" />

FIG. 6

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<img file="PL173533B1_D0010.tif" />

7A

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<img file="PL173533B1_D0011.tif" />

7B

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STEP 95

STEP 97

STEP 99

STEP 101

STEP 103

STEP 105

<img file="PL173533B1_D0012.tif" />

FIG. 8A

SUSPENSION BELT STEP 96 lERROR-COOE = 1)

BEAO HANGING ON CALLING STEP 98 [ERROR? C00E = 2]

BtAO TONE DIAL

J STEP 100 | ERROR-'cOOE = 3 [DTMF TONE BEAT | STEP 102 LERROR-COOETaI

CALL DETECTION BLAO | STEP 104 [ERROR-CODE ^ 5 [

BtAO ANSWERS TO CALLING STEP 106 ERROR JcOOE = ~ 6]

STEP 107

STEP 109

STEP 111

STEP 113

STEP 115

<img file="PL173533B1_D0013.tif" />

NO

POWER FAILURE-RACIO

<img file="PL173533B1_D0014.tif" />

BtAO CONNECTIONS

JKROK 110 | ERR0R_C00E = 8 |

- l _s

BtAO TON OF BUSINESS

J STEP 112 ERR0R_C00E = 9 ~ |

BtAO STATE 'ACTION

J STEP 114

1ERROR, something = 1O | BtAO 1000Hz '| STEP 116 lERROR-CODE 111

these

RETURN

FIG.8B

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STEP 117

STEP 118

STEP 119

STEP 120

STEP 121

STEP 122

STEP 123

STEP 124

<img file="PL173533B1_D0015.tif" />

FIG.9

173 533 □ □

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Ο ο

ll

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February LU ~ Z.

<img file="PL173533B1_D0017.tif" />

<img file="PL173533B1_D0018.tif" />

173 533

<img file="PL173533B1_D0019.tif" />

CN

ABOUT

Li_

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<img file="PL173533B1_D0020.tif" />

13A

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<img file="PL173533B1_D0021.tif" />

Fig.14

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<img file="PL173533B1_D0022.tif" />

1A is

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