JPS6042947A - Subscriber line test equipment - Google Patents

Abstract

PURPOSE:To eliminate spatial splitting link for the subscriber line test or to make the link to a very small scale by leading-in a subscriber line to an analog quantity measuring circuit, digitizing the result of measurement, feeding it to a display section via a digital path of a channel device, digitizing the signal by a subscriber circuit of a called party selecting signal from a subscriber's equipment, and connecting the signal to a signal measuring device via a digital bus of the channel device. CONSTITUTION:The analog quantity measurement of the subscriber line to be executed in a comparatively short time is executed by leading in the subscriber line in a analog quantity measuring circuit 14 via a relay 13, the result is transferred to a board 11 via a digital pulse 17, and on the other hand, the measurement of the called party selecting signal from the subscriber's equipment requiring a comparatively long time is conducted while being digitized by per channel CODECs 6, 6' and connected to a signal measuring circuit 14 of the board 11 via a digital path 16, and the result is displayed as it is on the board 11. Thus, since the holding time of the analog quantity measuring circuit 14 is made very short, no hindrance is caused to the service by only installing one measuring circuit 14 to plural subscriber lines.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a subscriber line testing device, and more particularly to a subscriber line testing device for a time-division exchange using a link-channel copier.

[The amount of invention]

The subscriber circuit of a conventional crossbar switch electronic switch (such as a DIOW switch using mechanical switches) only needs to have a 48V power supply function to the subscriber, and has other functions such as subscriber status. (on hook,
off-tickets, etc.) are collectively monitored by a subscriber line scanning section, and calling signals, etc. are sent to each subscriber from a signal trunk. On the other hand, in a digital exchange using a time division switch, the connection between the subscriber (SUB) and the subscriber circuit is composed of two analog lines (subscriber line), and after the time division switch part, each round trip It consists of a total of 4 digital lines, 2 lines each. Therefore, it is necessary to convert analog signals into digital signals in subscriber circuits and then time-division multiplex them. On one digital line, signals from many subscribers are digitized and sent out in a time-division manner, so functions such as monitoring subscriber status and sending out paging signals are integrated into a common part. Therefore, these functions must be provided for subscribers at a stage before the time division switch section. For this reason, separate digital/analog conversion circuits for each subscriber channel (per-channel co-opic) were developed.

Each function of the subscriber circuit, including the per-channel cooperative, is commonly referred to as BOI'1. ．． 5CHT standard: B is the communication current supply (Battery feed) Q is the protection circuit for overvoltage inflow prevention for electronic components (Qver)
voltage protection), R is ringing signal transmission (Ringing), S is loop on/off monitoring (5upervision), C is digital/analog signal conversion (Coder/decoder).
), 1.4 ij 2 k 4-wire conversion hybrid circuit (Hybricl), and Ti1-1' test lead-in (Testing).

FIG. 1 is a system diagram of a subscriber line testing device in a conventional all-digital exchange.

In FIG. 1, 1 is subscriber premises equipment, 2 is an analog subscriber line, 3 is a subscriber circuit, 4 is a time-division channel device, 5 is a time-division multiplex highway, 6 is a voice per-channel copier, and 7 5 is the subscriber-facing LIC (subscriber circuit section excluding the co-op IC), 8 is the analog line entry relay or switch in the subscriber circuit 3, 9 is the test switch,
10 is a measurement circuit, 1], il: circuit and stand for test operation and display, 12 is a plurality of measurement circuits 10 and a plurality of stands 1
This is a link that continues 1 and 4 in the evening. Since it is possible to fully digitize information exchange between the measurement circuit 10 and the stand 11, there is no need for the link 12 to be a special link, and a part of the time division channel device 4 is used. There are also cases. It is also conceivable that the time division telephone communication system 4 accommodates a plurality of highways 5, and the highways 5 further accommodate a plurality of subscriber circuits 3. Furthermore, test switch 9 need not be primary.

In the conventional apparatus shown in FIG. 1, in order to test the subscriber premises equipment 1 or the subscriber line 2, the tester dials or commands the number of the subscriber premises equipment 1 or information about the object to be tested from the stand 11. The control system starts up and connects the subscriber line 2 to the measurement circuit 1o according to the above instructions.
to draw into.

In other words, the control system is a pull-in relay or switch 8
By operating the test switch 9 and closing the test switch 9, the subscriber line 2 is connected to the measurement circuit 10 in an analog manner. In order to test subscriber line 2, the tester
By instructing a test for each measurement item, the measuring circuit 1o measures the external voltage, capacitance, and resistance for each instruction in accordance with the instruction. The measurement results are sent for each item from the measurement circuit 10 to the stand 11 and displayed. Next, when the tester instructs the subscriber premises equipment 1 to send ringing from the stand 11, the measuring circuit 10 sends out ringing to the subscriber premises equipment 1. When the response of the subscriber's premises equipment 1 is confirmed, a loop is formed along the route of machine 11-12-10-9-8-2 - subscriber's premises equipment 1, and a call between the tester and the subscriber is possible. becomes. The tester specifies a number to the subscriber, and uses the measurement circuit 10 to measure the number of dials made by the subscriber, speed, and make rate. If the subscriber premises equipment 1 is a PB telephone, a PBREC (button button signal receiver) installed in the measurement circuit 10
Receives the PB code and converts it into a number. The measurement results are sent from the measurement circuit 10 to the stand 11 for each item.
Is displayed. That is, while a series of measurements are being carried out,
The subscriber line 2 and the measuring circuit 10 are connected via the test switch 9.

Conventional space-division switching or 1l-j: In time-division switching using space-division concentrator stages, the main link or concentrator stage switch is space-division, so it is possible to have it also serve as a test link, and it is possible to use a special test link. There was no need to add anything. On the other hand, in an all-digital exchange using a per-channel cooperative 6, it is not possible to use the test link in a time-division manner, so it is necessary to separately add a test link for analog lines. and a test switch 9 between the plurality of subscriber circuits 3 and the plurality of measurement circuits 10;
The scale of 3 subscriber circuits and 10 measuring circuits during the entire test time.
Since it is necessary to connect two terminals, a switch large enough to accommodate the hold time is required.

In other words, testing of one subscriber premises equipment 1 and one subscriber line 2 usually takes more than one minute of trial and screen time.
A drawback is that in order to test a large number of subscriber lines 2, a large-scale test switch 9 must be installed.

[Purpose of the invention]

The object of the present invention is to eliminate such conventional drawbacks and to make it possible to eliminate space-divided links for subscriber line testing of all-digital exchanges, or to make them extremely small and economical. Our objective is to provide subscriber line testing equipment.

[Summary of the invention]

In order to achieve the above object, the subscriber line testing device of the present invention is used in a digital exchange that tests subscriber line switches or in-home equipment terminated to the single-person line. The analog signal is input to the measurement circuit, the measurement result is digitized, and the result is transmitted via the digital path of the channel equipment.
a first means for connecting to a display; and a second means for digitizing the called party selection signal from said premises equipment in a subscriber circuit and connecting to a signal measuring device via a digital path of a channel device. It is characterized by having the following.

[Embodiments of the invention]

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

FIG. 2 is a block diagram of a subscriber line testing device showing one embodiment of the present invention.

In Figure 2, 1.1' is the subscriber's premises equipment, 2.2'
is analog subscriber line, 3.3' is subscriber circuit, 6.6'
7.7' is a subscriber-facing 5LIC, 13,] 3' is an analog lead-in relay or switch, 5.5', 18 is a time division multiplex highway, 4 is a time division communication path device, 1'6.17 is a digital path installed in the time division communication path device 4, 14 is an analog quantity measuring circuit, and 15 is a digital highway.
11 is a circuit and stand for test operation and display; 19 is a signal measurement device;

In FIG. 2, the digital Φ highway interface 15 can also be a per-channel fist copier 6.6'9 However, in FIG. 2, the control system is not shown, and each device and circuit Although the number of these is limited to the minimum number necessary for the explanation, it goes without saying that more may be connected.

It is assumed that the per-channel cooperative 6.6' is equipped with a function of digitizing the called party selection signal sent from the subscriber premises equipment 1, 1'.

In Figure 2, among the measurement items for subscriber line premises equipment, the called party selection signal from premises equipment 1.1' accounts for nearly 90% of the total test time that takes more than one minute. Noting that this is a measurement, these called party selection signals are measured without passing through the test link 13°13', and are digitized by a copier 6.6' and then transferred to the network 5.
．． Test link 13 by performing through 5', 18
．． We are trying to shorten the average holding time of 13'.

First, in order to test the subscriber premises equipment 1 or the subscriber line 2, the tester inputs the number of the subscriber premises equipment 1 or information regarding the object to be tested from the machine 11 by dialing or using a command. When the stand 11 instructs the control system that an analog quantity is to be measured, the control system draws the subscriber line 2 into the measurement circuit 14 in accordance with the above instruction. That is, the control system operates the pull-in relay or switch 13, sets the path 17 in the time-division channel device 4, and activates the analog measuring circuit 14. The analog measurement circuit 14 measures voltage, resistance, and capacitance, and after measurement, converts each result into 15-5' = 1
Memory 19 of stand 11 via circuit 7'-18-19
In addition to sending out the data, it is also restored. Meanwhile, the platform 11 displays the received measurement results. If the measuring circuit 14 becomes corrupted,
The control system immediately restores the relay or switch 13 and disconnects the bus 17 of the time division channel device 4.

By doing this, when there are multiple units 11, for analog quantity measurement of subscriber lines other than subscriber premises equipment 1 and subscriber line 2, for example, subscriber premises equipment 1' and subscriber line 2',
The relay or switch 13' can now be activated and the measuring circuit 14 can be used.

Next, the measurement of the called party selection signal from the home devices 1, 1', which requires a long test time, will be explained. At present, the called party selection signal includes PB code and Atial pulse, but since the PB double signal is a signal in the voice frequency band, it is necessary to use a common voice cooperac and install it in common. The pB (;
As for pulses, it is possible to digitize them by using an audio copier in the same way as above, but if the number of channels is 6 or 6' as shown in Figure 2, then 8 to 4. -12 and sent as 8Kbps information to a 64Kbps digital information path, audio 56Kbps + 8Kbps
The information is sent to the stand 11 in the form of information, and then reproduced on the stand 11 to measure dial pulses, that is, the number of dials, dial speed, make rate, etc.

In this way, the analog quantity measurement of the subscriber line, which takes a relatively short time, is carried out via the relay 13 into the analog quantity measuring circuit 14 for measurement 7, and the result is transferred to the stand 11 via the digital path 17. The measurement of the called party selection signal from the premises equipment, which requires a relatively long time, is digitized by a per-channel copier 6°6' and connected via the digital path 16 to the signal measuring device 19 of the base 11. Measure it and display it on the stand 11 as it is.

Further, as another embodiment of the present invention, a subscriber circuit control circuit may be installed for each of multiple subscriber circuits such as the subscriber circuits 3 and 3' shown in FIG. 2, and the signal measuring device 19 may be provided therein. Conceivable. That is, there is a method in which the PB double signal or the dial pulse is sampled at an appropriate frequency, inputted to the control circuit, and the signal is measured there. As a result, the holding time of the analog quantity measuring circuit 14 can be extremely shortened, and one measuring circuit 14 can be installed in a plurality of subscriber lines, and the measuring circuit 14 can be used between those subscribers. Even if you are waiting for a meeting, there is no risk of disrupting the service.

In addition, one ringing sending function is for 5L for subscribers.
It is only necessary to use the functions originally provided in the ICs 7, 7/, and there is no need to use the functions of the measuring circuit 14.

Regarding outgoing call monitoring, currently, subscriber premises equipment 1 to 1'
If we are to monitor outgoing calls to
Adding a channel assignment function By this, when assigning a communication channel between subscriber premises equipment 1 and 1' (this is called channel A), at the same time a communication channel between subscriber premises equipment 1 and signal measuring device 19 is assigned. (Let this be channel B).

The tester accesses the copier 6 from the measurement equipment 22 via channel B, and thereafter monitors transmissions via channel A.

In this way, in the embodiment shown in FIG. For use, it is possible to meet up.

〔Effect of the invention〕

As explained above, according to the present invention, when testing subscriber lines for all-digital exchanges, a space-division access system for testing that had to be installed separately from the digital link can be installed.
Since links can be eliminated or made very small, the exchange can be made smaller and more economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of a subscriber line testing device in a conventional all-digital exchange, and FIG. 2 is a system diagram of a subscriber line testing device showing an embodiment of the present invention. 1.1'...Subscriber premises equipment, 2.2'...Analog subscriber line, 3.3'...Subscriber circuit, 6.6'...
・Per-channel cooperative, 7.7'... 5 LIC for subscribers 15, 5', 18... Time division multiplex highway, 4... Time division communication path device, 16.17...
Digital path, 14...Analog quantity measurement circuit, 1
5...Digital Highway Interface,
11... Test operation and display stand, 19... Signal measurement device. Continued from page 1 0 Inventor Taihei Suzuki Kokubunji City Higashi Koiga Kayo Research Institute

Claims (1)

[Claims] 1. In a digital exchange that tests a subscriber line or in-home equipment terminated on the subscriber line, the subscriber line is connected to an analog quantity measuring circuit, and the measurement results are digitized. a first means for connecting to the display unit via a digital path of the communication path device; and digitizing the called party selection signal from the above-mentioned premises equipment in a subscriber circuit; and second means for connecting to a signal measuring device. 2. When measuring the resistance, capacity, and vehicle pressure of the subscriber line, the first means connects the analog line to a deep analog quantity measuring circuit, sends the measurement results to the display, and then connects the 2. The subscriber line testing device according to claim 1, wherein the subscriber line testing device is configured to release the subscriber line test device. 3. The above-mentioned second means adds a means for assigning a 64km pitnograph (-second digital path to two channels) to the audio copier during a transmission monitoring test, and uses the means to assign a digital path to two channels. 2. The subscriber line saving test device according to claim 1, wherein the subscriber line saving test device monitors the access to monitor the outgoing call.