JPH0468848A - Push-button signal reception register - Google Patents

Abstract

PURPOSE:To output control information for controlling the balance value of a central office so that the crosstalk attenuation amount comes to the minimum by measuring the crosstalk attenuation amount of a PB signal for test in the central office for each BN pattern value and comparing those measured amounts. CONSTITUTION:When a level detection circuit 10 completely measures and stores the crosstalk attenuation amounts to all the BN pattern values, a comparator circuit 12 reads the crosstalk attenuation amounts stored in a storage circuit 11 from the circuit 11 and compares the read amount, and the BN pattern value, whose crosstalk attenuation amount is the minimum, is outputted to a control circuit 13 as the optimum BN pattern value. Based on the optimum BN pattern value, the control circuit 13 generates the control information for controlling the balance value of a balance network 8 in a central office 7. According to this control information, a CPU 5 controls the balance value of the balance network 8 in the central office 7 so that the crosstalk attenuation amount of the PB signal can be minimum.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is a system having a function of adjusting the balance value of a balance network of a central office line trunk that provides an analog central office line interface of a private branch exchange, or the gain of a variable gain amplifier. This relates to a push button signal (hereinafter referred to as PB double signal) reception register.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional PBB signal receiving register. In the figure, 1 is an interface for interfacing with a communication path, and 2 is a codec connected to this communication path interface 1 to mutually convert analog signals and digital signals. 3 is codec 2
4 is a control signal interface to which this PBB decoder 3 is connected.

5 is connected to the PBB via this control signal interface 4.
Central processing unit (hereinafter referred to as CPU) that controls the signal reception register
), and 6 is a control signal line that transmits a balancing signal for power supply control and loopback control from the control signal interface 4 to the codec 2 and PBB code decoder 3.

Next, the operation will be explained. The PB multiplied signal sent from the extension terminal is sent to the codec 2 via the communication path interface 1, where it is converted from a digital signal to an analog signal and sent to the PBB number decoder 3. The PBB number decoder 3 separates the two-frequency PB multiplied signal converted into an analog signal into a high group and a low group, determines the number corresponding to the received PB multiplied signal, and sends it to the control signal interface 4. The control signal interface 4 sends the numerical information corresponding to the PB multiple signal to the upper CPU 5.

Further, the control signal from the CPU 5 is once received by the control signal interface 4, and sent to the codec 2 and the PBB number decoder 3 via the control signal uA6 to start power supply control, loopback control, etc.

[Problem to be solved by the invention 1 Since the structure is more than that of the conventional PB signal reception register, the PB signal can be received by simply decoding the PB double signal.
It is not possible to quantitatively capture and process the doubled signal loop attenuation and reception level. Therefore, when setting the balance value of the balance network of central office line trunks, it is necessary to use a level meter, etc. to attenuate the loop signals for each office line trunk. Measure the amount and adjust the balance value so that it is the minimum,
Alternatively, it is necessary to select the one with the smallest amount of rotational attenuation from among several types of balance values given in advance, which requires a large amount of work (and, in terms of quality, it is difficult to service the amount of rotational attenuation. In some cases, it may not be possible to keep the level below a level that does not impose restrictions on the communication, and if the gain of the amplifier in the central office line trunk is insufficient, the reception level may drop and collocations may occur.

The invention described in claim (1) has been made to solve the above-mentioned problem, and provides control information for adjusting the balance value of the central office line trunk so that its wrap-around attenuation becomes the minimum. The purpose of this invention is to obtain a PBB signal reception register that outputs a PBB signal.

Another object of the invention is to obtain a PBB signal reception register that outputs control information for adjusting the gain of the amplifier of the office line trunk so that the reception level becomes the standard level.

[Means for Solving the Problems] The PBB signal receiving register according to the invention described in claim (1) calculates the loop attenuation amount in the test PB double signal station line trunk by the balance network no. B
a level detection circuit that detects each of the N pattern values), a memory circuit that stores the amount of wraparound attenuation,
A comparison circuit that compares the stored contents and outputs the optimum BN pattern value that minimizes the value of the wraparound attenuation amount, and a comparison circuit that adjusts the balance value of the balance network of the central office line trunk based on the optimum BN pattern value. It is equipped with a control circuit that generates control information.

Further, the PBB signal reception register according to the invention described in claim (2) includes a level detection circuit for extracting the test PB double signal level input to the central office line trunk, a storage circuit in which a reference level for comparison is registered, The system is provided with a comparison circuit that compares the reference level with the detection level of the level detection circuit, and a control circuit that generates control information for adjusting the gain of the amplifier of the office line trunk based on the comparison result.

[Function] In the comparison circuit according to the invention set forth in claim (1), each BN pattern value is detected by the level detection circuit and stored in the storage circuit. The control circuit compares the loop attenuation in the test PB double signal office line trunk and outputs the optimum BN pattern value that minimizes the loop attenuation in the station line trunk, and the control circuit uses the output of this level detection circuit. Optimal B
By generating control information for adjusting the balance value of the balance network of the central office line trunk based on the N pattern value, a PBB signal reception register is realized that streamlines the adjustment of the balance value of the balance network of the central office line trunk. .

Further, the comparison circuit in the invention according to claim (2) is
PB for testing the central office line trunk detected by the level detection circuit
The double signal level is compared with the reference level registered in the memory circuit, and the control circuit generates control information for adjusting the gain of the amplifier of the office line trunk based on the comparison result of the comparison circuit, thereby increasing the reception level. To realize a PBB signal receiving register which can bring the signal close to a standard level and prevent collocations.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the invention as set forth in claim (1). In the figure, 1 is a communication path interface, 2 is a codec, 3 is a PBB code decoder, 4 is a control signal interface, 5 is a CPU, and 6 is a control signal line, which are the same as those in the conventional system with the same reference numerals in FIG. Since the parts are the same or equivalent, detailed explanation will be omitted.

7 is connected to a private branch exchange that accommodates analog central office lines,
This is a central office line trunk that interfaces with the analog central office line. 8 is a balance network built in this central office line trunk 7 and whose balance value is variable.

Reference numeral 9 denotes a highway selector switch that switches the signal from the communication path interface 1 to the codec 2 and a level detection circuit to be described later. 10 is a test PB double signal connected to this highway changeover switch 9 and sent out from a PBB signal transmitting circuit which does not appear in the drawing, and a central office line trunk 7.
The level detection circuit detects the wraparound attenuation amount for each BN pattern value. Reference numeral 11 denotes a storage circuit that sequentially stores the amount of wrap-around attenuation detected by the level detection circuit 10 together with its BN pattern value.

Reference numeral 12 denotes a comparison circuit that compares the wraparound attenuation amounts stored in the storage circuit 11 and outputs the BN pattern value with the smallest value as the optimum BN pattern value. 13
is a control circuit that generates control information for adjusting the balance value of the balance network 8 in the office line trunk 7 based on the optimum BN pattern value output from the comparison circuit 12.

Next, the operation will be explained. During normal operation, the highway selector switch 9 is switched to the A side, and the system operates in the same manner as in the conventional case, and sends numerical information corresponding to the PB multiplication signal from the terminal etc. to the upper CPU 5.

Furthermore, when the balance value setting program is started, the highway selector switch 9 is switched to the B side, and the PB double signal coming in from the PB signal output side central office line trunk 7 is transferred via the communication path interface 1. , this highway is led to the level detection circuit 10 by the sword switch 9.

The level detection circuit 10 measures the amount of wraparound attenuation, and sends the measured value together with the BN pattern value at that time to the storage circuit 11 for storage. Next, the control circuit 13 changes the BN pattern value of the central office line trunk 7 by one pattern, and the level detection circuit 10 similarly measures the amount of PB double signal loop attenuation at that time. It is stored in the memory circuit 11. Below, this process will be applied to all B
Repeat execution for N pattern values.

When the measurement and storage of the wrap-around attenuation for all BN pattern values is completed, the comparator circuit 12 reads out the wrap-around attenuation stored from the storage circuit 11 and compares it, and selects the BN pattern value with the smallest wrap-around attenuation. is output to the control circuit 13 as the optimum BN pattern value. The control circuit 13 generates control information for adjusting the balance value of the balance network 8 in the office line trunk 7 based on the optimum BN pattern value.

This control information is transmitted to the CP via the control signal interface 4.
The CPU 5 sends the PB to U5, and according to the control information, the CPU
The balance value of the balance network 8 in the central office line trunk 7 is adjusted so that the attenuation amount of the defective signal is minimized.

Here, FIG. 2 is a flowchart showing details of the procedure.

First, start the program and register the destination number of the office line trunk COT#O with the lowest number (step 5).
TI). The number of the central office trunk to be called at this time is “j”
and give l as its initial value (step 5T2)
. Next, start the central office line trunk COT#j in step 5T.
3) Send a selection signal and have the call arrive at the office line trunk COT#O. The central office line trunk COT#0 automatically responds (step 5T4), and a communication path is formed from COT#j to central office line to OT#0 (step 5T5).

The state of the BN setting of the central office line trunk COT#O on the receiving side is checked (step 5T6), and if the BN setting is not completed, the time division switch (hereinafter referred to as TDSW) is controlled to control the PB signal transmission circuit and The PB signal reception register and the office line trunk COT#0 are connected via a bus (step 5T7).

Then, the counter k that counts the BN pattern value is set to =1
Further, the PB signal transmission circuit sends out a PB defect signal (Step 5T8), and the wrap-around attenuation amount at the office line trunk COT#0 is received by the PBR signal reception register (Step 5T9).

Next, go to the BN pattern value and the rotational attenuation at that time! f
0. is sent to the memory circuit and stored (step 5TII)
). This process is continued until it is detected that k has reached the maximum value n of the set number of BN pattern values (step 5T12).
), k is incremented (step 5T13) and repeated. If k=n, the TDSW is controlled to disconnect the bus (step 5T14), and a comparison circuit is used to calculate f(
.

Output k that minimizes as the optimal BN pattern value (
Step 5T15).

Next, the state of the BN setting on the calling side is determined in step 5T1.
6) If the calling party's BN setting has not been completed, T
The DSW is controlled to connect the PBS and PBR to the COT#j (step ST17).

Next, the process is passed to step ST8, and thereafter, as in the case described above, the BN pattern value and the wraparound attenuation amount f IK+ at that time are stored until =n (step ST8).
1) Also set the BN balance value of the central office line trunk COT#j at k that minimizes f +x+ with k=n (
Step 5T15).

When the setting of central office line trunk COT#j is completed, it is determined whether j has reached its maximum value m (step 5T18), and j is m.
If it is less than j=j+1 (step 5T19),
The process returns to step ST3 and a new office line trunk CO
Activate T#j and cause the receiving side central office line trunk COT#O to respond.

At this time, the central office line trunk COT#O on the receiving side is connected to the BN installation link COT#j (step 5T17), and the above processing is repeated until j=m. When j=m, the BN setting for all central office line trunks is completed and the process ends.

In addition, in the above embodiment, a case was explained in which the amount of wrap-around attenuation and its BN pattern value are stored sequentially, and when all the BN Bakun values are processed, they are read out and compared. The amount may be successively compared with the stored data, and the stored data may be updated each time with the smaller data, and the same effect as the above embodiment can be achieved.

FIG. 3 is a block diagram showing an embodiment of the invention set forth in claim (2). In the figure, reference numeral 14 denotes a receiver-side amplifier built in the central office line trunk 7, which amplifies the voice signal and whose gain can be adjusted.

In addition, 10 is a PB that does not appear in the drawing, on the central office trunk 7.
a level detection circuit for detecting the test PB flaw signal level inputted from the signal transmission circuit; 11 a storage circuit in which a reference level to be compared with the detection level is registered in advance; 1;
2 is a comparison circuit that compares the reference level with the detection level of the level detection circuit 10, and 13 is a control circuit that generates control information for adjusting the gain of the amplifier 14 of the office line trunk 7 based on the comparison result. It is a circuit.

All other parts are the same as the parts labeled with the same reference numerals in FIG.

Next, the operation will be explained. In a call between extension terminals housed in a private branch exchange equipped with central branch trunks 7 each containing a gain-adjustable amplifier 14, the called party PB signal transmission circuit of the private branch exchange and the PB of the private branch exchange on the receiving side
The test PB double signal is transmitted and received between the signal reception registers.

In the PB signal reception register of the private branch exchange on the reception side, the highway changeover switch 9 is switched to the B side, and the reception is sent to the test PB double signal level detection circuit 10 via the communication path interface 1, and its Level detected. The test PB double signal detection level detected by the level detection circuit 10 is sent to the comparison circuit 12 and compared with a reference level registered in advance in the storage circuit 11.

The comparison result of the comparison circuit 12 is sent to the control circuit 13, and the control circuit 13 generates control information for adjusting the gain of the amplifier 14 of the office line trunk 7 based on the comparison result.

This control information is transmitted via the control signal interface 4 to the cp
According to the control information, the CPU 5 adjusts the gain of the amplifier 14 in the office line trunk 7 so that the speech level reaches a desired level, brings the receiving level closer to the standard level, and prevents speech.

〔Effect of the invention〕

As described above, according to the invention recited in claim (1), the loop attenuation amount in the test PB double signal office line trunk is measured and compared for each BN pattern value, and the loop attenuation amount in the test PB double signal office line trunk is measured and compared. Since the configuration is configured to generate control information for adjusting the balance value of the balance network of the central office line trunk based on the optimal BN pattern value that minimizes the value of attenuation, the balance value of the balance network of each central office line trunk can be adjusted. Individual settings can be made in a short time, maintenance work can be made more efficient, and quality and service can be improved.

Further, according to the invention set forth in claim (2), the test PB double signal detection level that has passed through one office line trunk is compared with a reference level registered in advance, and based on the comparison result, the office line Since the system is configured to generate control information for adjusting the gain of the trunk amplifier, it is possible to obtain a reception level equivalent to a standard level, and this has the effect of preventing telephone calls.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a PB signal reception register according to an embodiment of the invention as claimed in claim (1), FIG. 2 is a flowchart showing its operation procedure, and FIG.
FIG. 4 is a block diagram showing an embodiment of the invention described in 2), and FIG. 4 is a block diagram showing a conventional PB signal receiving register. 7 is a central office trunk, and 8 is a balance network. 10 is a level detection circuit, 11 is a storage circuit, 12 is a comparison circuit, 13 is a control circuit, and 14 is an amplifier. In the drawings, the same symbols refer to the same or equivalent parts.

Claims (2)

[Claims] (1) A test signal sent from a push-button signal transmission circuit in a central office line trunk that is connected to a private branch exchange that accommodates analog central office lines, interfaces with the analog central office line, and has a built-in balance network with variable balance values. a level detection circuit that detects the amount of rotational attenuation of the push button signal for each balance network pattern value; a storage circuit that stores the amount of rotational attenuation detected by the level detection circuit; a comparison circuit that compares wrap-around attenuation amounts and outputs the balance network pattern value with the smallest value as an optimal balance network pattern value, and based on the optimal balance network pattern value output from the comparison circuit, and a control circuit for generating control information for adjusting a balance value of the balance network of the central office line trunk. (2) Push-button signal transmission through a central office line trunk that is connected to a private branch exchange accommodating the analog central office line and interfaces with said analog central office line, and that has a built-in amplifier for amplifying the voice signal with adjustable gain. a level detection circuit that detects the level of the test push button signal from the circuit;
a storage circuit in which a reference level to be compared with the detection level of the level detection circuit is registered in advance; a comparison circuit that compares the reference level registered in the storage circuit with the detection level of the level detection circuit; and the comparison circuit. a control circuit for generating control information for adjusting the gain of the amplifier of the central office line trunk based on the comparison result of the push-button signal receiving register.