JPH03151750A - Remote measuring method for subscriber line characteristic - Google Patents

Abstract

PURPOSE:To realize the inexpensive subscriber line characteristic remote measuring method by providing a subscriber line characteristic arithmetic processing section to all subscriber line remote multiplex transmitters in common at the side of a central exchange station. CONSTITUTION:A measurement command section 101 in a subscriber line characteristic remote measuring equipment 10 selects a subscriber line remote multiplex transmitter 2 accommodating a subscriber 1 being a measurement object and a relevant subscriber line terminal station multiplex transmitter 3 and sends a measuring command signal to the said subscriber line terminal station multiplex transmitter 3 via a 1:m switch 103. The sent measuring signal is changed according to the characteristic of the subscriber line 1 being the measuring object and returns to a measuring signal transmission/change detection section 61, the change is detected and the signal is inputted to a subscriber line characteristic arithmetic processing section 64 via the 1:m switch 103 as a digital signal and the calculation to obtain the characteristic of the subscriber line 1 is implemented at the section 64 and the result is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for remotely measuring subscriber line characteristics for measuring the characteristics of subscriber lines accommodated in a central exchange via multiple transmission lines from the central office side. It is related to.

Generally, switching equipment is installed in areas where a certain size of population is concentrated, but in areas where the population is not so large, switching equipment is not installed, and switching equipment installed in that area and the area where the population is concentrated. A multiplex transmission line is used to connect the terminals with the switchboard, and through the multiplex transmission line, subscriber lines in areas with a small population are accommodated in the exchange (the station where the exchange is installed is (referred to as aggregation station). Of course, it is necessary to install multiplex transmission equipment at both ends of the multiplex transmission path.

That is, the subscriber line terminal multiplex transmission equipment installed on the exchange side and the subscriber line remote multiplex transmission equipment installed on the subscriber side are connected by a multiplex transmission path, and the subscriber line remote multiplex transmission equipment installed on the subscriber line side There is a switching system in which a subscriber line accommodated in a subscriber circuit is connected to the exchange via the multiplex transmission line and a subscriber line terminal multiplex transmission device. Characteristics (insulation resistance, capacitance, etc.) of the subscriber line accommodated in the subscriber circuit in the subscriber line remote multiplex transmission device via the multiplex transmission line from the station multiplex transmission device side
This invention relates to a method for remotely measuring subscriber line characteristics.

[Conventional technology]

FIG. 2 is a block diagram illustrating a conventional method for remotely measuring subscriber line characteristics as described above.

In the figure, 4 is an exchange, 3 is a subscriber line terminal multiplex transmission device, and 7 is a subscriber line characteristic measurement and instruction device, all of which are installed on the central exchange side. Note that the number of subscriber line terminal multiplex transmission devices 3 is not limited to one, but a plurality (in this example, #l
m pieces of ~#m) are provided.

Reference numeral 2 denotes a subscriber line remote multiplex transmission device, which is in a one-to-one relationship with the subscriber line terminal multiplex transmission device 3; in this case, m pieces #1 to #m are provided, and the corresponding subscriber line terminal multiplex It is connected to the transmission device 3 via a multiplex transmission path 5. The subscriber line remote multiplex transmission device 2 includes subscriber circuits 21, 1:n.
A switch 22 and a signal multiplexing section 23 are included. Note that the number of subscriber circuits 21 is not limited to one, but a plurality (in this example, n circuits #1 to #n) are provided. A telephone 8 is accommodated in each subscriber circuit 21 via the subscriber line 1. In addition, 6 is a subscriber line characteristic measuring device, which is also installed in a one-to-one relationship with each subscriber line remote multiplex transmission device W2, and in this case, m pieces are installed.

FIG. 2A is a block diagram showing details of the subscriber line characteristic measuring device 6. As shown in FIG. As seen in the figure, the subscriber line characteristic measuring device 6 includes a measurement signal transmission/change detection section 61, a subscriber line characteristic calculation processing section 64, and a D/A (A/D) conversion section 65. I'm here.

A conventional method for remotely measuring subscriber line characteristics will be described with reference to FIGS. 2 and 2A.

First, from the subscriber line characteristic measurement instruction device 7, select the subscriber line remote multiplex transmission device 2 in which the subscriber line 1 to be measured is accommodated, and further the subscriber line terminal multiplex transmission device 3 corresponding thereto. , sends out a measurement instruction signal in a digital signal format.

Then, this measurement instruction signal is transmitted from the subscriber line characteristic measurement instruction device 7 to the subscriber line end station multiplex transmission device 3, the multiplex transmission line 5,
The signal enters the subscriber line remote multiplex transmission device 2 through the signal multiplexing section 23 and enters the subscriber line characteristic measuring device 6. Then, in the subscriber line characteristic measuring device 6, the D/A (A/D)
The conversion unit 65 converts the digital signal up to that point into an analog signal, which passes through the subscriber line characteristic calculation processing unit 64 and then travels to the measurement signal transmission/change detection unit 61 to instruct measurement.

Then, the measurement signal sending/change detection unit 61 sends the measurement signal to the subscriber line 1 to be measured via the 1:n switch 22 and the subscriber circuit 21.

The transmitted measurement signal changes according to the characteristics of the subscriber line 1 to be measured and returns to the measurement signal transmission/change detection section 61, so that the amount of change is detected. The detected amount of change is sent from the measurement signal sending/change detection section 61 to the subscriber line characteristic calculation processing section 64, where calculations for determining the characteristics of the subscriber line 1 are performed.

The obtained calculation result is converted into a digital signal in a D/A (A/D) converter 65, and then sent to a signal multiplexer 23,
The signal is sent to the subscriber line characteristic measurement and instruction device 7 via the multiplex transmission line 5 and the subscriber line terminal multiplex transmission system W3.

Telemetry of any desired subscriber line characteristics is then carried out from the aggregation switching center side.

[Problem to be solved by the invention]

In the conventional subscriber line characteristic remote measuring method as described above, the expensive subscriber line characteristic calculation processing section 64 included in the subscriber line characteristic measuring device 6 is replaced by the subscriber line remote multiplex transmission device 2.
There is a problem in that a large number of devices must be provided depending on the number of devices, resulting in high costs.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the problems in the prior art and provide a method for remotely measuring subscriber line characteristics at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention does not place an expensive subscriber line characteristic calculation processing unit for each subscriber line remote multiplex transmission device, but instead provides a It is now provided commonly for transmission equipment.

[Effect]

As a result, the subscriber line characteristic measuring device only needs to be provided with a relatively low-cost measurement signal sending/change detection section, and there is no need to provide a large number of expensive subscriber line characteristic calculation processing sections. A method for remotely measuring subscriber line characteristics at low cost can be realized.

〔Example〕

Next, the present invention will be explained in detail.

FIG. 1 is a configuration diagram for explaining one embodiment of the present invention. In the figure, the same reference numerals are given to the same parts as in FIG. 2 and FIG. 2A.

In addition, IO is a subscriber line characteristic remote measuring device, which includes a measurement instruction section 101, an A/D conversion section 102, and an m switch 103.
, a subscriber line characteristic calculation processing section 64. The subscriber line characteristic telemetry device 10 is commonly connected to m subscriber line terminal multiplex transmission devices 3 via an l:m switch 103.

Reference numeral 11 denotes an auxiliary device for measuring subscriber line characteristics, which includes a measurement signal sending/change detecting section 61 and a D/A (A/D) converting section 65. They are provided correspondingly.

Next, a method for remotely measuring subscriber line characteristics according to the present invention will be explained with reference to FIG.

First, from the measurement instruction section 101 in the subscriber line characteristic telemetry device 10, the subscriber line remote multiplex transmission device 2 in which the subscriber line 1 to be measured is accommodated, and furthermore, the subscriber line end station multiplex transmission device corresponding thereto. 3 is selected, the measurement instruction signal is converted into a digital signal format by the A/D converter 102, and then sent to the subscriber line terminal multiplex transmission device 3 via the 1:m switch 103.

Then, this measurement instruction signal is transmitted from the subscriber line end station multiplex transmission device 3 to the subscriber line remote multiplex transmission device 2 via the multiplex transmission path 5.
The signal passes through the signal multiplexing section 23 and enters a control section (CPU, not shown) in the subscriber line characteristic measurement auxiliary device ll.

Then, the control unit (CPU) creates a measurement signal and sends the measurement signal to the measurement signal sending/change detection unit 61 via the l:n switch 22 and the subscriber circuit 21 to transmit the measurement signal to the measurement target. The signal is sent to subscriber line 1.

The transmitted measurement signal changes according to the characteristics of the subscriber line 1 to be measured and returns to the measurement signal transmission/change detection section 61, so that the amount of change is detected. The detected amount of change is sent from the measurement signal sending/change detection section 61 to D/
A (A/D) is input to the converter 65, where it is converted into a digital signal, and then sent to the signal multiplexer 23, the multiplex transmission line 5,
It enters the subscriber line characteristic telemetry device 10 via the subscriber line terminal multiplex transmission device 3. This amount of change is then input as a digital signal to the subscriber line characteristic calculation processing unit 64 via the 1:m switch 103, where calculations are performed to determine the characteristics of the subscriber line 1, and the result (subscriber line 1 properties) are found.

Next, another embodiment slightly different from the above will be described.

Measurement 0 in the subscriber line characteristic telemetry device 10 From the instruction unit 101, the subscriber line remote multiplex transmission device 2 in which the subscriber line l to be measured is accommodated, and the corresponding subscriber line terminal multiplex transmission device 3 is selected, the measurement instruction signal and the measurement signal are converted into a digital signal format by the A/D converter 102, and then sent to the subscriber line terminal multiplex transmission device 3 via the 1:m switch 103. . In other words, the measurement signal is also created and sent by the measurement instruction section 101.

Then, the measurement instruction signal and measurement signal enter the subscriber line remote multiplex transmission system W2 from the subscriber line end station multiplex transmission device 3 via the multiplex transmission path 5, and pass through the signal multiplexing section 23 to determine the subscriber line characteristics. It enters the D/A (A/D) converter 65 in the measurement auxiliary device 11. Here, the measurement instruction signal and the measurement signal are converted from digital signals to analog signals and supplied to the measurement signal sending/change detection section 61.

Then, the measurement signal sending/change detection section 61 immediately sends the measurement signal to the subscriber line 1 to be measured via the 1:n switch 22 and the subscriber circuit 21. The transmitted measurement signal changes according to the characteristics of the subscriber line 1 to be measured and returns to the measurement signal transmission/change detection section 61.
The amount of change is detected, and the detected amount of change is input from the measurement signal sending/change detection section 61 to the D/A (A/D) conversion section 65, where it is converted into a digital signal,
The signal enters the subscriber line characteristic telemetry device 10 via the signal multiplexing section 23, the multiplex transmission line 5, and the subscriber line terminal multiplex transmission device 3. This amount of change is input as a digital signal via the l:m switch 103 to the subscriber line characteristic calculation processing unit 64, where calculations are performed to determine the characteristics of the subscriber line 1, and the result (subscriber line l properties) are found.

In the explanation of the embodiment described above, the subscriber line characteristic measurement auxiliary device 11 was explained as being provided in common for n subscriber circuits 21 in the subscriber line remote multiplex transmission word W2, but Since the subscriber circuit 21 inherently includes an A/D conversion function, etc., by simply adding a small amount of hardware to the subscriber circuit 21, the subscriber line characteristic measurement auxiliary device 11
Since 1 2 functions can be incorporated, in that case, the 1:n switch 22 becomes unnecessary.

〔Effect of the invention〕

As described above, according to the present invention, a large number of expensive subscriber line characteristic calculation processing units, which were conventionally included in subscriber line characteristic measuring devices, are provided in accordance with the number of subscriber line remote multiplex transmission devices. There is no need to do this, and it is sufficient to provide one unit in common for all subscriber line remote multiplex transmission devices, which has the advantage of realizing a method for remotely measuring subscriber line characteristics at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining an embodiment of the present invention, FIG. 2 is a block diagram for explaining a conventional example of a subscriber line characteristic telemetry method, and FIG. FIG. 2 is a block diagram showing details of the line characteristic measuring device. Explanation of symbols ■... Subscriber line, 2... Subscriber line remote multiplex transmission device, 3... Subscriber line end office multiplex transmission device, 4... Exchange, 5... Multiple transmission line, 10... Subscriber line characteristic remote measuring device, 11... Subscriber line characteristic measurement auxiliary device.

Claims (1)

[Claims] 1) Subscriber line terminal multiplex transmission equipment (
A multiplex transmission path connects the subscriber line remote multiplex transmission equipment (hereinafter simply referred to as the terminal station transmission equipment) and the subscriber line remote multiplex transmission equipment installed on the subscriber side (hereinafter simply referred to as the remote transmission equipment), and In a switching system in which a subscriber line accommodated in a circuit is connected to the exchange via the multiplex transmission line and the terminal station transmission device, the characteristics of the subscriber line are measured from the terminal station transmission device side via the multiplex transmission line. In a method for remotely measuring subscriber line characteristics, the remote transmission device includes a measurement signal sending/change detection unit corresponding to each remote transmission device, and the terminal station transmission device includes a plurality of terminal transmission devices. A measurement instruction section and a subscriber line characteristic arithmetic processing section are provided in common for each, and the measurement instruction section sends out/changes the desired measurement signal via the terminal transmission device, multiplex transmission line, and remote transmission device. When a measurement instruction is given to the detection unit,
In response, the measurement signal sending/change detection section creates a measurement signal and sends it to the subscriber line to be measured via the subscriber circuit in the remote transmission device, and sends the measurement signal to the subscriber line to be measured. When the amount of change according to the characteristics is detected, the amount of change is sent to the subscriber line characteristic calculation processing section via the remote transmission device, multiplex transmission line, and terminal transmission device, and measured in the subscriber line characteristic calculation processing section. A method for remotely measuring subscriber line characteristics, characterized in that characteristics of the target subscriber line are determined by calculation. 2) In the subscriber line characteristic telemetry method according to claim 1, the measurement instruction section creates not only a measurement instruction signal but also a measurement signal, and sends out the measurement signal/detects a change together with the measurement instruction signal. The measurement signal transmission/change detection section transmits the received measurement signal itself to the subscriber line to be measured without creating a measurement signal. Method.