KR930006860B1 - Trunk testing system - Google Patents

Abstract

The apparatus has functions for interfacing trunks with a centralized automatic report on trunks, for testing analog transmission characteristics and for testing digital transmission characteristics. The apparatus includes an analog subsciber interface (5) for interfacing subscriber and an exchange to call far end responder trunk testing apparatus, a digital trunk interface (6) for interfacing digital trunks to test digital link, a control port to interface with centralized automatic reporting on trunks, an internal dial-up modem post for communicating with far end responder trunk testing apparatus, a test unit (3) for testing trunks and for sending the test result to an access switching maintenance processor (ASMP), and an interface unit (2) for interfacing the test unit (3) with the ASMP to send test data and test instructions.

Description

Trunk Line Tester of Electric Switch

1 is a configuration diagram of the connection to the peripheral device of the relay test apparatus according to the present invention.

FIG. 2 is a block diagram showing the detailed configuration of the trunk line test apparatus measuring unit of FIG. 1; FIG.

3 is a network diagram of a trunk line test apparatus to which the present invention is applied.

4 is a test flow chart for measuring the level / frequency of a TUT in operation.

5 is a test flow chart showing a process in which a relay line channel under test is looped back.

* Explanation of symbols for main parts of the drawings

1: ASMP 2: Matching part

3: measuring unit 4: FIA

5: ASI 6: DTI

7: TCCA 8: TFDU

9: TACA 10: TAMA

11: TAIA 12: TDIA

13: TDPA 14: TFRA

15: trunk line tester

The present invention relates to a trunk line test apparatus for performing a test on the relay line to improve the line quality and to provide a quality service for the input and output relay line accommodated in the electronic switchboard.

The system for trunk line testing currently in operation in Korea (KT; Korea Telecom) is a CAROT (Centralized Automatic Reporting On Trunks) system developed by AT & T in the United States, and a remote office test line (ROTL) located in Toll / Tandem office. Or '105' code 105, which is an analog transmission characteristic for the outgoing line, with a 56A type FER (Far End Responder) in a remote trunk test unit (RTTU) and a '105 test line' in a large country. 'test)' to maintain the relay network. Code 105 Tests include 105 Loss, 105 Noise, 105 Frequency Slope, 105 Return Loss, and 105 Mismatch Tests. (Balandce Test), "but 105-Echo Loss and Mismatch Tests are not currently available. Therefore, it is possible to detect the abnormal occurrence of the relay line by 'Code 105 test', but in order to perform the test for the more detailed relay line, the test should be performed by connecting a separate measuring device manually. There is a problem in that the digital characteristics of the relay line should be measured by connecting a separate digital test apparatus for the test. This is because bit error in digital communication system is a direct cause of signal distortion or data loss, and is the biggest cause of deterioration of quality and efficiency of service.

After all, considering that the general public telephone network is gradually becoming digital, the code 105 test, which is an analog transmission characteristic test for the existing network, cannot fully perform the maintenance function for the trunk line network.

Therefore, the present invention devised to solve the problems of the prior art, the matching function of the centralized relay line automatic test system CAROT, as well as the matching function by the exchange operator for the relay line contained in the tone / tandem electronic switch The purpose of this test is to provide a repeater test apparatus to test individual extra analog transmission characteristics with local terminal and to perform the digital test function in consideration of the fact that the repeater network is being digitalized.

In order to achieve the above object, the present invention is connected to ASI (Analoge Suybscriber Interface), which provides an interface between the subscriber and the exchange to call the trunk line test apparatus of a large country, and provides a digital relay line interface for digital link test. (Normal / European) (T1 / CEPT) PCM link of (Digital Trunk Interface) is connected, and an internal dial for communication with the control port for matching with the CAROT and the trunk line tester of a large country It is a dial-up modem port that accepts subscriber lines through a public public telephone network, and measures the test relay line to be tested according to all data and commands received through communication with the higher processor ASMP (Acess Switching Maintenance Processor). Measuring means for conducting a test for and transmitting the result to the ASMP in an interrupt manner; Matching means connected between the ASMP and the measuring means connected to an inter-processor communication node (IPC) node to perform an interface converter function between the measuring means and the ASMP, and to change the data format of measurement data or instructions to a corresponding format. It characterized by having a.

The present invention configured as described above is a code 105 test by matching with the centralized trunk line trunk line automatic test system CAROT, as well as level / frequency measurement, noise measurement, envelope delay distortion (envelope) to the local terminal by the exchange operator Various analog transmission specific tests such as delay distortion measurement, intermodulation distortion measurement, tran-sients measurement and return loss measurement are possible. In addition, the present invention is EFS which is the number of seconds (ES) and percentage% ES, which is the number of seconds having at least one error among the total number of bits transmitted, bit error / error rate, and instant time other than the analog transmission specific test, and the number of seconds where no error occurs. Digital characteristic tests such as (Erroed Free Second), percentage% EFS, total number of blocks of pseudo random test pattern, BER (Bir Error Rate) test to measure block error / error rate, channel monitor function, signal generation and analysis function, etc. Can be performed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a trunk line test apparatus according to the present invention, where 1 is an ASMP, 2 is a matching section, 3 is a measuring section, 4 is FIA, 5 is ASI, 6 is DTI, and 15 is a trunk line test apparatus.

The trunk line test apparatus 15 according to the present invention is divided into a trunk line test apparatus matching unit 2 and a trunk line test apparatus measuring unit 3, and the matching unit 2 and the measuring unit 3 are standard RS-232C serial communication. This is done. The relay line tester measuring unit 3 is composed of eight boards, and the matching unit 2 is composed of one circuit pack, a trunk-test data conversion board assembly (TDCA), and can match two identical measuring units.

The TDCA consists of a TD-bus interface and three RS-232C ports. The TD-bus is responsible for this interface with the ASMP (Acess Switching Maintenance Processor) (1), and RS-232C ports 0 and 1 are the respective measuring units. Port 2 is used as the local monitor port for TDCA self maintenance.

The main function of the matching unit 2 consisting of a TDCA located between the ASMP 1 and the measuring unit 3 connected to an interprocessor communication node (IPC) node is the measuring unit 3 and the TD- of RS-232C communication. It performs interface converter function between ASMP (1) performing bus communication and changes the data format of measurement data or command to the corresponding format.

Analog Subscriber Interface (ASI) 5, which provides an interface between the subscriber and the exchange, provides a general subscriber line to a test port of a trunk line tester (TTC) 15, thereby providing a trunk line tester (TTC) of a large country. I call FER and perform the test over that line. The digital link test port of the trunk line tester (TTC) also accepts the North American / European (T1 / CEPT) PCM link of the Digital Trunk Interface (DTI) 6 providing a digital trunk line interface.

The trunk line test apparatus 15 performs TD-bus communication with the ASMP (Access Switching Maintenance Processor) 1, and conducts a test on the relay line to be tested according to all data and commands received through the TD-bus. The result is sent to the ASMP (1) in an interrupt manner.

The trunk line test apparatus (TTC) 15 may transmit its function alarm, hernia alarm, and the like to the Fault Interface in ASS Block 4.

In addition, the trunk line test apparatus (TTC) 15 has an internal dial-up modem port for communicating with a control port for matching with the CAROT and the trunk line test apparatus (TTC) of a large country. Subscriber line through public payphone network is accepted.

2 is a block diagram showing the detailed configuration of the trunk line tester measurement unit of FIG. 1, 7 is TCCA, 8 is TFDU, 9 is TACA, 10 is TAMA, 11 is TAIA, 12 is TDIA, 13 is TDPA, and 14 is TFRA. Represent each.

As shown in FIG. 2, the measurement unit 3 has a common control unit (TCCA) connected through eight circuit packs, a VME bus for performing all the control for the test, and an internal test bus for performing the actual test. 7), floppy disk driver unit (TFDU) (8), auxiliary control unit (TACA) (9), analog matching main unit (TAMA) (10), analog matching unit (TAIA) (11), digital interface unit (TDIA) 12), and a digital signal processor unit (TDPA) 13 and a power station response unit (TFRA) 14.

All circuit packs are standard VME bus communication, except for the Power Station Response Unit (TFRA) 14 under the control of the Common Control Unit (TCCA) (7), the auxiliary control unit (TACA) (9), the digital signal processor unit ( TDPA) (13), Analog Matching Main Unit (TAMA) (10) and Digital Interface Unit (TDIA) (12) are interconnected by an internal test bus, a CEPT-based PCM link, to provide test signals between the units. Send and receive

The function of each unit constituting the measuring part is as follows.

The common control unit (TCCA) (7) controls all units of the trunk line tester (TTC), performs RS-232C communication with the data conversion unit (TDCA) of the matching unit, and standard VME bus communication with the other units. Each test signal carried on the internal test bus and controlling the interface between the digital signal processor unit (TDPA) 13 and the matching units (TAMA, TDIA) 10, 12 that actually measure the test signal. signal) destination.

The Profibus Disk Driver Unit (TFDU) 8 is a 3.5-inch Floppy Disk Driver, which is used to control programs and measurement result data to be performed in the trunk line test apparatus (TTC) under the control of the common control unit (TCCA) 7. Save it.

According to the command of the common control unit (TCCA) 7, the auxiliary control unit (TACA) 9 performs all external communication, received message analysis and error detection. It also generates a frequency of 2,048, MHz and 8KHz of PCM link (CEPT), an internal test bus, and manages dial-up modem port for communication with trunk line test equipment (TTC) of large power. do.

The analog matching main unit (TAMA) 10, along with the analog matching unit (TAIA) 11, is an analog line via a channel bank connected to an ASI 5 or a TDX-10 for performing analog test functions. Provides an interface with the (VF line). The PCM test signal received from the digital signal processor unit (TDPA) 13 through the internal test bus is converted into an analog signal or the analog signal received from the test bus into a PCM signal, thereby converting the digital signal processor unit (TDPA) ( 13). It also controls the control port for receiving test commands from CAROT and the external modem port for BER testing of modem lines.

The digital signal processor unit (TDPA) 13 is connected to all signals coming through the analog matching master unit (TAMA) 10 or the digital matching unit (TDIA) 12 under the control of a common control unit (TCCA) 7. The test signal is generated as a PCM test signal and then sent to the matching unit.

The digital matching unit (TDIA) 12 may configure a digital link with DT1 of the T1 / CEPT method as a matching unit for performing a digital test function for the relay line. The digital matching unit (TDIA) 12 consists of two transmitting (Tx) and receiving (Rx) ports, respectively, and the trunk line tester (TTC) under the control of the common control unit (TCCA) 7 operates in the corresponding mode. To form a digital path.

The Power Station Response Unit (TFRA) 14 is a 56A type FER that acts as a response unit for code 105 test requests from the power NER (NeaR End ReSponder) for incoming lines, and acts as an ASI (5) or TDX-10. An '105 test line', which is an analog line (VF line) through a channel bank connected to the power supply response unit (TFRA) 14, is connected.

3 is a network diagram of a trunk line test apparatus to which the present invention is applied.

The trunk line test apparatus (TTC) in large power stations, when shown in Fig. 3, interconnects the general subscribers via the public switched telephone network (PSTN) to the dial-up modem port of the auxiliary control unit and tests the trunk line under test (TUT). A separate path is required to download the test program file to be performed in the trunk line tester of the large country and to receive the test results from the relay line tester of the country. Configured.

Referring to the process of the relay line test according to the present invention configured as described above with reference to Figures 4 and 5 as follows.

4 is a test flow chart for measuring the level / frequency of the TUT under operation in connection with a terminating tester in a test network connected as shown in FIGS. 1 and 3. When the test request by the operator is input, the ASMP (1) makes a test request with the call center tester, and the call tester uses the public telephone network (PSTN) to check the repeater relay test device of the receiving station. Call the modem port. When the modem lines are connected to each other, the calling tester sends a 'test preparation request' to the receiving tester, and the receiving tester notifies the exchange that it is 'in use' by the calling tester. Notify the calling party of the response to the 'preparation request' through the modem line. At this time, the source tester calls the test port of the test device of the receiving side via the relay line under test occupied by the exchange. The receiving test apparatus receives the test call through the relay line under test and sends the result to the calling party through the modem line. The source tester sends a 'test tone request' to the receiver after receiving the test transmission / reception result through the modem line, and the source tester sends the level of the test signal transmitted from the test relay connected to the test port. Measure the frequency with. The originating tester transmits the measurement result to the operator, requests 'release call' through the modem line, and requests the release of the modem line after completion of the release. The receiving tester shall inform the exchange of the completion of the test preparation after the release of the modem line.

5 is occupied by the repeater test equipment control software of the exchange to configure the test path as shown in FIGS. 1 and 3, and is controlled by the test apparatus control software (TLT) of the receiving exchange. A test flow chart showing how the measurement trunk line channel loops back.

When the test request is input by the operator, the control software occupies the time switch of the TUT channel to be connected to the digital matching part of the repeater test device, and the BER test request is sent to the receiving exchange through the same channel. Dial the special number '163' corresponding to When the receiving exchange receives a special number '163' from the calling exchange, it notifies the control software that manages the relay line test, and the control software loops back the transmitting channel and the receiving channel after the time switch. The call completion signal is sent to the calling exchange. The source exchange recognizes the 'call complete' signal as 'BER test ready' and the control software requests the BER test with the repeater tester. At this time, the repeater test apparatus receives a pseudo random test pattern of 2047 bits with the transmitting end of the digital matching unit and measures the BER on the specific relay line. The measurement results are output to the operator through various software with various BER parameters.

The present invention configured and operated as described above can perform 'code 105 test' under the control of CAROT, and as a function of various analog transmission characteristics test by the exchange operator, the level measurement, noise measurement, envelope delay distortion. measurement of envelope delay distortion, measurement of intermodulation distortion, measurement of phase and amplitude jitter, measurement of peak to average ratio, measurement of transisnts, reflection loss (return loss) measurement and the digital test function can perform BER (Bit Error Rate) test, channel monitor function, signal generation and analysis function.

Claims (4)

Claims [1] A relay line test apparatus for performing a test on a relay line to improve line quality and provide quality service for an input / output relay line accommodated in an electronic switchgear; Digital Trunk Interface (DTI), which is connected to the Analoge Sybscriber Interface (ASI) 5, which provides the interface between the subscriber and the exchange for calling the trunk line tester of the large station, and provides a digital trunk line interface for the digital link test. North American / European (T1 / CEPT) PCM link is connected, and the control port for matching with CAROT and the internal dial-up modem port for communication with the trunk line test equipment of the large country A dial-up modem port is used to accept subscriber lines through a public public telephone network, and to communicate with the measured relay line to be tested in accordance with all data and commands received through communication with the ASMP (Acess Switching Maintenance Processor) (1). Measuring means (3) for conducting a test and transmitting the result to the ASMP 1 in an interrupt manner; It is connected between the ASMP (1) and the measuring means (3) connected to an interprocessor communication node (IPC) node performs an interface converter function between the measuring means (3) and the ASMP (1), measurement data or instructions And a matching line (2) for changing the data format of the data format to the corresponding format. The device according to claim 1, wherein the matching means (2) has a TD-bus interface and three RS-232C ports, wherein the TD-bus interface is responsible for the interface with the ASMP (1). The second port (port 0, port 1) is used to connect with up to two measurement means 3, and the third port (port 2) is used as a local monitor port for self-maintenance. Test Date Convertion Board Assembly) trunk line test apparatus characterized in that consisting of. The repeater test apparatus according to claim 1, wherein the matching means (2) and the measuring means (3) perform RS-232C serial communication. The VME bus means according to claim 1, wherein said measuring means (3). An internal test bus means, a common control unit (TCCA) 7 connected to the VME bus means to control all units of the repeater test apparatus, a control of the common control unit (TCCA) 7 connected to the VEM bus means. Connected to the VME bus means and the internal test bus means for storing the program and measurement result data to be performed in the following trunk line tester, the common control unit (TCCA) 7 Analog matching, which is connected to the auxiliary control unit (TACA) (9) for performing communication with the outside and receiving message block analysis and error detection under control, the VME bus means and the internal test bus means to provide an analog line and an interface. A unit (TAMA) 10, which is connected to the VME bus means to provide an interface with an analog line with the analog matching main unit (TAMA) 10. Matching unit (TAMA) 11, a digital matching unit (TDIA) 12, connected to the VME bus means and the internal test bus means for performing a digital test function for a relay line, the VME bus means and the internal test bus means Connected to the common control unit (TCCA) 7 to perform measurements on all incoming signals through the analog matching main unit (TAMA) 10 and digital matching unit (TDIA) 12 under control. Remote Office Test Line (ROTL) under the control of Digital Signal Processor Unit (TDPA) 13 and CAROT (Centralized Automatic Reporting On Trunks) to generate the test signal required for the PCM test signal and transmit it to the matching unit. Relay line test apparatus, comprising a counter response unit (TFRA) 14 that provides a FER (Far End Responder) function in response to a code 105 test request from a remote trunk test unit (RTTU). .