JPS6033331B2 - Remote testing method for subscriber line carrier telephone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote testing method in a subscriber line carrier telephone system.

Up until now, maintenance of this system has been inconvenient because maintenance personnel had to go to the location where each piece of equipment was installed and perform on-site tests to understand the details.

The present invention enables maintenance personnel to activate a predetermined test section and automatically perform a test by making a telephone call from a remote location.
In addition, the details of the failure are notified by a plurality of types of audible sounds. The subscriber line carrier telephone system referred to in
This is a telephone system specifically designed to deal with the demand for small-scale multiple telephones, in which a carrier current is passed through the subscriber line, and multiple (for example, up to 5) subscriber terminals on the central office side can be connected to this. be.

This subscriber line carrier telephone system consists of station equipment, relay equipment,
It consists of subscriber equipment and lines connecting them, and an example of its configuration is shown in FIG.

However, in FIG. 1, devices such as a remote testing section added for the method of the present invention are also drawn in thick lines. This telephone system and the method of the present invention will be explained below mainly with reference to FIG. Since the majority of system failures are line failures and subscriber phone failures, testing methods for these shall be explained. In the telephone office, a central office equipment 14 is installed immediately adjacent to the exchange 11.

Between the two, there are subscriber terminals on the station side, such as 5 terminals 121 to 125.
For the purpose of the present invention, the central subscriber terminal 13 is particularly connected to the book. Reference numeral 10 denotes a maintenance station where maintenance personnel are stationed, and the maintenance station 10 and exchange 11 are connected through a subscriber terminal 101 like a normal telephone line.

The station device 14 includes a converting section 141, a monitoring section 144, a remote testing section 142, a current supply section 143, and a polarity reversing section 145.

The exchange part 141 connects the terminals 121 to IZ
25 are converted into a plurality of carrier frequency signals having different frequencies for each terminal, which are folded and sent to the line 151, while the telephones 231 to 235 The off-hook signal and call signal from the subscriber equipment IZ88 to IZ22 are converted into respective carrier frequency signals, and the off-hook signal and the call signal from the
, the signal sent via the line 151 is received, separated by carrier frequency, and sent to the subscriber terminal 1 on the station side.
21 to 125.

FIG. 3 shows the frequency arrangement of the above carrier frequency signal.

The distance from the station equipment to the subscriber equipment is 85~13 arc HZ (10KH
A high group carrier wave of 2 intervals, maximum 6 channels) is sent, and in the opposite direction, a low group carrier wave of 15 to 6 HZ (1 dish HZ interval, maximum 6 channels) is used. Railroad 15
1152, the above-mentioned first subscriber device 1 is installed at a desired point.
8, second subscriber device 19, . . . can be connected.

When the distance of the line 151 becomes long, the repeater 17 is installed in the middle of the line to amplify the signal.

The relay device 17 has a built-in monitoring current generator 171 for monitoring the lines 151 and 152,
It sends out KHZ monitoring current.

The monitoring current generating section 171 in the case where the relay device 17 is not provided is installed within the monitoring section 144, for example. Now, as mentioned above,
1st, 2nd, ... subscriber 18, 19, ...
... has a signal conversion and restoration function, but the power consumed in this step is generated by a current supply section 143 in the station device 14 and is supplied by a so-called constant current power supply method.

That is, as shown in FIG. 1, each subscriber is connected to each subscriber in the form of a constant voltage power supply from both ends of each of the Jenner diodes 251 to 255, which are connected in series to the power supply line 16 after passing through the line 160 and the polarity reversing unit 145. It supplies power to devices 18-22. Diode 24 was added for purposes of the method of the invention and will be discussed below. In addition to the above, the power supply unit 143 combines the power for the relay device 17 with the carrier frequency signal of the line 151 through the line 153 and sends it to the relay device 17 .

It is possible to send power to the subscriber units 18 to 22 using this method, and in that case, two wires would be sufficient (four wires in Figure 1), but when there are many subscriber units and they are located far away, Since this requires a high voltage, it is advantageous to separate the power supply lines for the repeater and for the subscribers as in the above example. A monitoring unit 144 in the station device 14 constantly monitors whether the level of the monitoring current from the relay device 17 is normal, and also connects the power supply to the line 16 in the polarity reversing device 145 through a line 146. We also constantly monitor whether the flow conditions are normal.

Now, when a maintenance person executes a remote test using the method of the present invention, he can call the office equipment 14 from the maintenance station 10 via the subscriber terminal 101 using a regular subscriber telephone.

However, in the present invention, it is assumed that the station equipment 14 itself is also given a "subscription number" in advance, and can be dialed from the maintenance station. If you have this dial, you will be able to
1, a calling signal is sent to the station-side subscriber terminal 13 corresponding to that subscription number.

Then, the remote testing section 142 is activated by this call signal, automatically performs a predetermined test of the present invention according to the flowchart shown in FIG. 2, and sends the results to the maintenance station 10' (normal Audible tones a, b,..., f... are sent to the receiver of the Yuka handset. The following explanation will be given with reference to both FIG. 1 and FIG. 2 (flow chart of the method of the present invention).

In FIG. 2, block 31 is the remote testing section 014 described above.
This is the activation of 2. 142 is activated, this 142 monitors the level of the monitoring current of the line 151 that is being monitored by the above-mentioned monitoring unit 144 and the state of the current feeding current of the line 16 (line 146
It checks and determines (through line 246) whether the system (monitored through line 246) is normal and reports the result. This is block 32 of the flowchart. Depending on the result of the determination, the next course of the flowchart is divided into three directions.

As a result of the determination, if the monitored current level of the line 151 is abnormal, the process advances to block 33; if it is normal and the state of the power supply current of the line 16 is abnormal, the process advances to block 34; if both are normal, the process advances to block 35. . By the way, the remote testing department 142
There are multiple audible sounds a, b, ... f, ...
... is built in, and the above judgment results are sent to the station side subscriber terminal 13 and the exchange 1 in the form of separate audible tones.
1, the signal is sent to the maintenance station via terminal 101.

(Therefore, maintenance personnel only need to listen to the telephone receiver.
) Therefore, for example, in the flowchart of FIG. 2, when the next path is block 33, block 33 emits the audible sound a(
For example, 400 HZ) is transmitted, and this sound continues until the end of the flowchart of block 40 to notify that a fault has occurred somewhere on the hearing line 151. flock 3
4, the remote testing section 142 (through line 148)
The polarity inverter 145 is driven to invert the polarity of the current supplied to the line 16.

Then, it is inspected through the line 146, the monitoring unit 144, and the line 246 whether the power supply current flows normally. If the result is normal, the flowchart proceeds to block 341; if the result is abnormal, the flowchart proceeds to block 342.

In flock 341, audible sound b (for example, 12 of 400 days 2)
0WT, 120 intermittent times per minute), in block 342 the audible sound c (e.g. 601NT at 400Hz) is 13,11
, 101 to the maintenance station, and these sounds are sent to block 4.
This continues until the end of the flowchart of 0.

(At the end of block 40, the previously reversed polarity of the feed is reversed.) The above audible tone b indicates that the maintenance personnel have realized that the feed current of reverse polarity has passed through the diode 24, and therefore at least He knows that the line 16 up to No. 24 is normal, and depending on the audible sound c, he knows that there is an abnormality in that section. In block 35, which corresponds to the path when both the level of the monitoring current and the state of the power supply current are normal, the remote testing section 142 sends a control signal (for example, Satoshi 2) to the converting section 141 through the line 241.
(149 in FIG. 1 is a control signal generation section).

This control signal is converted into a carrier frequency signal corresponding to the first subscriber unit and sent to line 151. Now, inside the first subscriber device 18 there is a detection section 180 for the control signal,
When the control signal is detected, the aforementioned off-hook signal is transmitted to the line 15.
Send to 2.

This off-hook signal passes through the line 152, the relay device 17, the line 151, and the line 150, and arrives at the monitoring unit 144, where it is determined whether the level is normal or not.
Navel results will be sent. Then, in this block 35, an audible sound f (for example, 800 Hz) is sent to the maintenance station while the above is executed. If the level is normal, the flowchart proceeds to block 351 where the audible tone d (e.g. 8
00HZ, 60mT) is sent to the maintenance station, and if the level is abnormal, the process proceeds to block 352, where an audible sound e (for example, 800HZ, 120mT) is sent. After a predetermined period of time, those audible tones are muted and the flow ticket proceeds to block 36, where the remote testing section 142 sends a control signal (e.g., Mining Day 2) over line 242 to the second subscriber device in the same manner as described above. Prompts the sending of the off-hook signal of No. 19.
The second subscriber device also includes a control signal detection section 190 in the same way as the first subscriber device. The monitoring unit 144 also determines whether the level of this off-hook signal is normal. If normal, the process proceeds to block 361; if abnormal, block 3
Proceed to 62.

In block 361, an audible sound d (e.g. 60
mT), block 362 sends an audible tone e (eg, 120 state T of 800 days 2) to the maintenance station. These are the same audible sounds as 351 and 352 above, but with
While the second subscriber unit is being determined, an audible sound f (e.g., 800 Hz) can be sent out as in block 35 to notify maintenance personnel that the flowchart has proceeded to determining the second subscriber unit. After that, the same thing happened in the 3rd, 5th, etc.
The process continues to the subscriber units and ends at block 40.

Note that the audible sounds can be distinguished not only by frequency as described above, but also by adding intermittent frequencies to increase the variety of audible sounds, which can be used particularly conveniently when increasing the number of test items for a system.

Further, in the above example, the diode 24 is placed in front of the first subscriber equipment, but the insertion location may be any location on the line 16 (for example, the location indicated by the dotted line 240), and is determined by considering the line length, probability of failure, etc. Should.

According to the present invention, maintenance personnel are located at a remote maintenance station,
By simply making a call to the station equipment and hearing an audible tone from the comfort of your home, you can easily find out whether there is a fault in the system, its location, and its type, making maintenance extremely simple.

Moreover, as explained above, the equipment that requires this is neither particularly expensive nor difficult to design and install, making it an extremely useful invention industrially.

[Brief explanation of the drawing]

FIG. 1 is a configuration example of a subscriber line carrier telephone system, FIG. 2 is a flowchart of a remote testing method, and FIG. 3 is a frequency allocation diagram. 10... Maintenance station, 1 1... Exchange, 13
.... Station side subscriber terminal specially provided for the present invention,
14... Station device, 141... Conversion unit,
142...Remote test section, 143...Power supply current supply section, 144...Monitoring section, 145...
... Gutter reversal section, 147... Audible sound generation section, 149
...... Control signal generation section, 151, 152, 16.
...Railway, 17...Relay equipment, 171...
... Monitoring current generation section, 18-22 ... Subscriber equipment, 180-220 ... Control signal detection section, 231-2
35...Telephone, 24...Diode, 2
51-255... Zener diode. O Z diagram O' diagram Nata diagram

Claims (1)

[Scope of Claims] 1. In a subscriber line carrier telephone system, a subscription number is also assigned to the station equipment itself, and the tester can call the station equipment from a remote maintenance station using the subscription number. Activate the remote test section installed in the station equipment, and at a predetermined point on the line that feeds power to the subscriber equipment constituting the subscriber line carrier telephone system, in parallel to the subscriber equipment and with respect to the normal power supply voltage. Connect a diode in the opposite direction,
During a remote test, the remote test section reverses the voltage polarity of the power supply current, and then determines whether the power supply current flows normally or not. 1. A remote testing method for a subscriber line carrier telephone system, characterized by determining whether it is before or after. 2. At the time of the remote testing, a control device is provided in the remote testing section and the subscriber device, and the control device provided in the remote testing section sequentially sends control signals to the plurality of subscriber devices and responds to the control signals. Claim 1, characterized in that the level of an off-hook signal transmitted by a control device provided in the subscriber device is detected to determine whether the operating state of the subscriber device is good or bad. A remote testing method for the described subscriber line carrier telephone system.