SU1343560A2 - Apparatus for checking telephone connection lines - Google Patents

Abstract

The invention is an improvement of the device according to A. No. 1053323 and provides improved accuracy control residual attenuation. The device contains an interfacing unit 1, consisting of nodes 2 and 3, matching and register 4, control block 5 consisting of indicator 6 of test 7, memory element 8 (EP), decoder 9, interrupt unit 10 , switch 11 and additional EP 22, measurement unit 12 consisting of register 13, potential connection block 14, switch 15, control blocks 16 and 17, ADC 18, additional register 23 and regulating element (OM) 24, block 20 of coincidence and group measuring path 21. The verification program is entered in the EDS 8. For monitoring residual additional attenuation introduced EP 22, an additional register 23 and SE 24. The EP 22 is recorded the information on the nominal values of the residual attenuation controlled (CS). In accordance with the QC number, the decoder 9 generates a control voltage, which is written to the additional register 23 and the RE 24 is processed. As a result, the level of the signal that passes through the RE 24 does not depend on the nominal value of the residual attenuation. 2 Il. (C (L -j I I -t-riJi 00 th SL O5 14) Fig. 7

Description

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The invention relates to telecommunications, can be used to monitor the electrical parameters and the operability of telephone channels, and is an improvement to the device according to the author. St. No. 1053323.

The purpose of the invention is to increase the accuracy-control of the residual attenuation,

FIG. Figure 1 shows the electrical circuit diagram of a device for testing telephone connecting lines; Fig. 2 shows time diagrams of the device operation while monitoring the residual attenuation.

The device contains an interfacing unit 1 consisting of the first 2 and second 3 matching nodes and register 4, the control block 5 consisting of indicator 6, test 7, memory element 8, decoder 9, program interrupt node 10 and switch 11, a measurement unit 12 consisting of register 13, a potential connection unit 14, a switch 15, a first 16 and a second control unit 17 and an anodog-converter converter 18, a control signal allocation unit 19, a coincidence unit 20, a grouped-off connecting line, additional measuring path 21 the memory element 22 in the control unit 5; an additional register 23 and the regulating element 24 in the marital unit 12.

The device works as follows.

The verification program that determines the type of verification and the number of sets to be tested (sealed relay connecting lines (RRLS)) is entered by the operator using the test set or remotely via the first matching node 2 in control unit 5, where the lOj node triggers decoder 9. The latter sends the program from testatura 7 to memory element 8, where the entered program is stored until the end of the test.After the program is entered into memory element 8, the device proceeds to check RSLU kits, according to the algorithm for verification, which is also recorded in the memory element 8. In this case of unit 5 in the register 4 is checked zapisshaets number emogo ffllekta ko and a connection device manufactured parvl- allel object under test.

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After that, the decoder 9, the algorithm extracted from this memory, sends commands to the switch 15 and analogue-digitizer forms: 18, At the same time, the switch connects to the group measuring potential of different potentials via le resistors, the switch mutates the signal from one of the formational inputs to the output then enters the analog-to-q converter 18, where the conversion is connected to the E form and transformed to the decoder 9 of block 5,

The decoder 9, using the signals cumulatively from the analog-digital driver 18, produces a set type (input, service), is free, blocked), and using block 14 is busy if it is free.

The volume and sequences are determined by the verification code. Usually, the component includes checking for noise

residual attenuation values, verification of the establishment of an answering machine and a number of other rock. Programs are possible, only one of the first checks is carried out. At the same time, for a set, the device can check the level of noise fed from the canal by the complecting equipment of the compaction unit and the test of the residual puff of the channel, ci also check the laziness of the connection to the auto answer

For the inbound kit, only the call interface of the answering machine is checked. Verification of the correctness of the connection to the answering machine from the de- scraper 9 at the connection block 14 is given by signals, the cat 14 periodically connects to the terminal inputs - the outputs, respectively, of the potentials +60 B and -60, are pulses per measure.

After completing the dialing of the connection to the answering machine, is the right updated, right 5 last and on one of the control

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After that, the decoder 9 according to the algorithm extracted from the memory element 8, sends commands to the block 14, the switch 15 and the analog-to-digital converter: 18, At the same time, the block 14 connects to the wires of the group measuring path of 21 different potentials through f lyennye resistors, the switch 15 switches the signal from one of its information inputs to the output, which then enters the analog-to-digital converter 18, where the switched signal is converted into E and a digital form and transferred to a decoder torus 9 of block 5,

The decoder 9 uses a set of signals coming from the analog-digital converter 18 to determine the type of set (incoming, outgoing, service), states (busy, free, blocked), as well as using block 14, if turned out to be free.

The scope and sequence of the tests is determined by the verification program code. Typically, tests include checking noise in a seal.

the magnitude of the residual attenuation in the line, checking the connection to the answering machine and a number of other checks. Programs are possible in which only one of the listed checks is carried out. In this case, for an outgoing kit, the device can check the level of noise coming from the channel of the associated compaction equipment, check the residual damping of the specified channel, ci also check the connection to the answering machine.

For the incoming set, only the check of connection establishment to the answering machine is carried out. To check the correctness of the connection to the answering machine from the decoder 9, the potential connection unit 14 sends signals that the unit 14 periodically connects to the control inputs - outputs, respectively, potentials +60 W and -60 V, which are dialing pulses.

After dialing is completed, if the connection to the answering machine is set to right, then 5 the latter is turned on and a positive potential appears at one of the control inputs - outputs. At the same time, a 700 Hz frequency response signal of the answering machine generator appears.

The positive potential through the switch 15 is supplied to the analog-to-digital converter 18 and further to the decoder 9, which acts on the register 13. of the block 12, while the latter sends a signal from its output to the first input of the block 20. The control frequency signal of 700 Hz is allocated by the block 19 is converted into a direct current signal and fed to the second input of a matching unit 20.

If the indicated signals are present at the inputs of the block 20 | two of these signals, the receiver 18 also receives a direct-current signal from the output of the switch 15 and the answering machine to the analog-digital signal npeo6p. This signal, converted into digital form, goes to the decoder 9, which transmits to the indicator 6 information that the connection to the answering machine is set correctly.

When the connection to the answering machine is set incorrectly as a result of the distortion or incorrect reception of dialing pulses, the connection is not established to the answering machine, but to the regular telephone network subscriber and the last person picked up the receiver, the same control input also shows the will result in the appearance of a signal at the second input of the block 20 coincidence. However, due to the absence of a 700 Hz signal at the output of block 19 and, accordingly, at the first input of block 20, there will be no signal. In this case, the block 20 does not work and the signal to establish the connection to the answering machine will not arrive in the analog-to-digital converter 18. The latter will transmit to the decoder 9 a signal that is different from that which had been established when the connection was made to the answering machine.

In this case, the decoder 9 detects the indicator 6, as well as the first 2 and second 3 nodes of the agreement that the connection to the answering machine is not set correctly.

When checking the noise level, the first control unit 16 issues a constant signal

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current, proportional to the noise level in the channel, which through switch 15 enters analog-to-digital converter 18, after which the resulting digital code enters decoder 9, where it is compared with a predetermined threshold value, and then the comparison result is transmitted to the output of the device, as well as 6, where it is recorded, for example, in the form of information. The level of noise in the channel is curled.

Checking the residual attenuation in the proposed device is carried out as follows.

In order to control the residual attenuation, informational residual attenuation values of the monitored channels (its passport value for each channel) is recorded in the additional memory element 22 in advance.

After entering from testatura 7 or through 5 through block 1, the interface of information about the type of test and the number of the set to be tested (Fig. 2a is for the kit having the nominal value of the residual attenuation of -9.5 dB; Fig. 26 for the kit, having a nominal residual attenuation value of -12 dB), the device is connected to the specified monitored channel (RLLS kit) by a program recorded in memory element 8, after which the second control unit 17 generates and transmits the measuring signal 800 via a pair of wires of the group measuring path 21 Hz (FIG .2c). This signal through the controlled channel through the second pair of wires of the group measuring path 21 is returned to the second control unit 17, from which through the switch 15 it goes to the first input of the regulator

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element 24 (Figg).

At the same time, information about the number of the set or channel under test (Fig. 2e) is sent from the decoder 9 to the additional memory element 22, after which information about the nominal value of the residual attenuation of this channel (Fig. 2e) comes from the memory element 22 to the decoder 9. The decoder 9, based on the received information, generates the required value of the control signal (Fig. 2g), which is written to the register 23 and

its output (fig. 2z) is fed to the second input of regulating element 24. Under this signal, under the influence of this signal, the transmission coefficient of regulating element 24 (fig.2i) changes in accordance with the nominal attenuation of the tested channel recorded in memory element 22. As a result, the level of the signal passed through the regulating element 24 and the input to the analog-digital converter 18 (Fig. 2k) does not depend on the nominal value of the residual attenuation of the tested set or channel.

After measuring the level of the received signal and comparing it with the threshold value in the analog-digital converter 18 (FIG. 2L), the decoder 9 evaluates the test result and outputs information about it to the indicator 6 and the interface 1 (FIG. 2m).

Compiled by A.Seselkin Editor P.Geershi Tehred M.Didyk Corrector M.Demchik

Order 4837/57 Edition 638 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

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Claims (1)

Invention Formula Device for checking telephone connecting lines by aut. St. No. 1053323, characterized in that, in order to ensure the accuracy of the residual attenuation control, an additional memory element is inserted into the control unit, the control address and information inputs of which are connected to the first, second and third outputs of the control unit, respectively, and an additional the register, the control, address and information inputs of which are connected respectively to the control, address and information inputs of the measurement unit, and a regulating element connected between the output of the switch and input analog-digital converter, the output of the additional register is connected to the second input of the regulating element.