JPH0490651A - Remote subscriber fault processing system - Google Patents

Abstract

PURPOSE:To improve the service and maintainability of a remote subscriber office service system by restarting normal service for a subscriber without necessitating for a maintenance person to go to a distant place even after the fault occurs in a transmission line and the control process against the subscriber circuit is confused. CONSTITUTION:When the fault occurred in a transmission line 7 is recovered and information is transmitted through the transmission line 7 in the remote subscriber office service system, an oscillation phase fixed means 400 starts reception of information by a fixed phase, further, transmits the information to a subscriber circuit 5 after the fault of the transmission path 7 is recovered and time when normal information can be received is chosen. Therefore, the subscriber circuit 5 can recover normal control process immediately, and there is no need for the maintenance person to go to the distant place deliberately. Thus, the service and maintainability of the remote subscriber office service system is improved.

Description

[Detailed Description of the Invention] [Summary] A remote subscriber accommodation system in which subscribers are accommodated in a subscriber circuit installed at a location remote from an exchange, and the subscriber circuit is connected to the exchange via a transmission path. Regarding the remote subscriber failure handling method, even after a failure occurs in the transmission line and the control process for the subscriber circuit is disrupted, it is possible to resume normal service to the subscriber without requiring maintenance personnel to travel to a remote location. For the purpose of an oscillation phase fixing means for fixing the phase of an oscillator installed at a remote location when a fault has occurred in the transmission line; Instead of the information arriving from the transmission path, a predetermined blockage signal is generated and transmitted to the subscriber circuit, and after a predetermined time has elapsed after the fault detection means detects recovery of the fault that has occurred. , a blockage signal sending means for stopping the transmission of the blockage signal and transmitting information arriving from the transmission path to the subscriber circuit, and the blockage signal blocks the subscriber circuit to the accommodated subscriber. In addition, the configuration is configured so that all information arriving from the transmission path after that can be received, and the predetermined time is such that the information arriving from the transmission path where the fault has been recovered is sufficient to restore the normal state. Configure it so that it is set at a certain time.

[Industrial application field]

The present invention provides a remote subscriber failure handling system in a remote subscriber accommodation system that accommodates subscribers in a subscriber circuit installed at a location remote from an exchange and connects the subscriber circuit to the exchange via a transmission path. Regarding.

[Conventional technology]

FIG. 4 is a diagram showing an example of a remote subscriber accommodation system to which the present invention is applied, and FIG. 5 is a diagram showing an example of a conventional remote control device.

In FIGS. 4 and 5, a switch (SW) 1 installed in a switching center 100 directly accommodates subscribers 2 located in the vicinity, but it accommodates subscribers 3 located far from the switching center 100. , subscriber line 4 if accommodated directly in switchboard (SW) 1
Since the length of the switch exceeds the allowable limit, the subscriber circuit (LC) 5 that the switch (SW) 1 is equipped with to accommodate the subscriber 2
is installed at a remote location 200 near the remote subscriber 3 to accommodate the subscriber 3, and each subscriber circuit (LC) 5 is connected to the exchange ( SW
)1.

A switching system (SW) 1 time-division multiplexes digital data d to be transmitted to each subscriber 3 and transmits it to a remote control device (RCL) 6 via a transmission line 7.

In the remote control device (RCL) 6, a data processing section (
DP) 61 extracts control information for controlling the subscriber circuit (LC) 5 in a predetermined control process from the data d- arriving from the transmission path 7, and converts it into a format suitable for the subscriber circuit (LC) 5. Processed data d.

and transmits it to the subscriber circuit (LC') 5.

Further, the oscillator (PLL) 62 extracts a clock signal clk from the data d arriving from the transmission line 7, and generates an internal clock signal clk that is phase-synchronized with the extracted clock signal clk.
+ is generated and supplied to the timing generation circuit (TG) 63 and the like.

The timing generation circuit (TG) 63 also includes an oscillator (PL).
L) Generates various timing signals based on the internal clock signal Cfk supplied from the data processing unit (
DP) 61 and other remote control devices (RCL) 6.

In such a state, if a failure occurs in the transmission line 7, the exchange (
a disturbance occurs in the data d transmitted from SW) l to the remote control device (RCL) 6 and thus in the processed data d transmitted from the remote control device (RCL) 6 to each subscriber circuit (LC) 5; The subscriber circuit (LC) 50 control process is confused,
The subscriber circuit (LC) 5 becomes inoperable.

On the other hand, the fault detection circuit (ED) 64 extracts a clock signal clk and a frame signal f from the data d, and monitors the extracted clock signal clk and frame signal f for abnormalities to detect faults occurring in the transmission line 7. When an abnormality is detected in the clock signal Cfk or the frame signal f, it is determined that a fault has occurred in the transmission line 7, a fault detection signal e (for example, logic "1") is generated, and the oscillator (P
LL) 62.

The oscillator (PLL) 62 that received the failure detection signal e outputs the internal clock signal c I! Generate k l with its own phase.

When the fault that occurred in transmission line 7 is eventually recovered, the exchange (
SW)l via transmission path 7 to the remote control device (RCL)
) 6 starts transmitting data d, but the remote control device (R
Since the CL) 6 operates based on + of the internal clock signal cji' having its own phase generated by the oscillator (PLL) 62, the data processing unit (DP) 61 receives the data d arriving from the transmission path 7. Extracted clock signal cI!
A phase difference occurs between the two and the data d cannot be processed normally, and the subscriber circuit (LC) 5 cannot recover the normal control process after that, and the service to the subscriber 3 is stopped.

In such a state, in order to restore the normal control process to the subscriber circuit (LC) 5 and restore the suspended service to the subscriber 3, a maintenance person must go to the remote location 200 and perform the necessary restart processing. occurs.

(Problems to be Solved by the Invention) As is clear from the above explanation, in conventional remote subscriber accommodation systems, when a failure occurs in the transmission path 7, the control process for the subscriber circuit (LC) 5 is disrupted. The service to the subscriber 3 will be stopped, and in order to restore the normal control process to the subscriber circuit (LC) 5 and restore the service outage to the subscriber 3, a maintenance person will go to the remote location 200. It was necessary to perform the necessary restart processing.

An object of the present invention is to enable normal service to subscribers to be resumed without requiring a maintenance person to travel to a remote location even after a failure occurs in a transmission path and the control process for subscriber circuits is disrupted. do.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 1 is an exchange, 5 is a subscriber circuit installed at a remote location 200, 3 is a subscriber accommodated in the subscriber circuit 5, and 7 is a transmission line connecting the subscriber circuit 5 to the exchange L. be.

300 is a fault detection means provided at the remote location 200 according to the present invention.

400 is an oscillation phase locking means provided at the remote location 200 according to the present invention.

500 is a blockage signal sending means provided at the remote location 200 according to the present invention.

[Operation] The fault detection means 300 monitors information transmitted to the subscriber circuit 5 via the transmission line 7 and detects whether a fault has occurred in the transmission line 7.

When the failure detection means 300 detects that a failure has occurred in the transmission line 7, the oscillation phase locking means 400 fixes the oscillation phase at the remote location 2.
Fix the phase of the oscillator installed at 00.

The blockage signal sending means 500 closes the transmission line 7 when the failure detection means 30 detects that a failure has occurred in the transmission line 7.
Instead of the information arriving from
After a predetermined period of time has elapsed since recovery from the fault in which 0 has occurred is detected, the transmission of the blockage signal is stopped, and the information arriving from the transmission path 7 is transmitted to the subscriber circuit 5.

It should be noted that the blockage signal generated by the blockage signal sending means 500 is considered to block the subscriber circuit 5 to the accommodated subscriber 3 and to enable reception of all information arriving from the transmission path 7 thereafter. .

Furthermore, during the predetermined time set by the blockage signal sending means 500, information arriving from the transmission line 7 whose fault has been recovered is
It is considered that the time is set to be sufficient to restore normal conditions.

Therefore, when the fault that occurred in the transmission path is recovered and information is transmitted via the transmission path, the information will immediately start receiving at the phase fixed by the oscillation phase locking means, and the fault in the transmission path will be recovered. After determining the time when normal information can be received, the information is transmitted to the subscriber circuit, so the subscriber circuit can immediately restore the normal control process, which eliminates the need for maintenance personnel to go to remote locations. The serviceability and maintainability of the remote subscriber accommodation system are improved.

〔Example〕

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

FIG. 2 is a diagram showing a remote control device according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of various signals in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures. The target remote subscriber accommodation system is the 4th
As shown in the figure.

In FIG. 2, the failure detection means 300 in FIG.
A fault detection circuit (ED) 64 is provided as a first fault detection circuit (ED).
An oscillator (PL) is used as the oscillation phase fixing means 400 in the figure.
L)62. Also, an off signal generation circuit (OG) 65, a protection circuit (GD) 66, and a selection circuit (SEL) 67 are provided as the blockage signal sending means 500 in FIG.

Note that the off-signal generating circuit (OG) 65 generates an off-signal Of as a blocking signal generated by the blocking signal sending means (500) in FIG.

In FIGS. 2 to 4, the failure detection circuit (ED) 64
As described above, the transmission line 7 We are monitoring failures that occur.

Currently, there is no failure in the transmission line 7, and the clock signal cI! k or the frame signal f is normal, the fault detection circuit (ED) 64 activates the oscillator (PLL) 62. The fault detection signal e transmitted to the protection circuit (GD) 66 is set to a fault non-detection state (for example, logic "0").

The protection circuit (G
D) 66 sets the selection signal S transmitted to the selection circuit (SEL) 67 to logic "0".

When the selection signal S transmitted from the protection circuit (GD) 66 is set to logic "O", the selection circuit (SEL) 67 selects the input terminal "0" side, and also selects the selection signal S or logic If set to “1”, input terminal “1”
Choosing a side.

In such a state, the data processing unit (DP) 61 processes the data d arriving from the transmission line 7 from the subscriber circuit (
A selection circuit (SEL) extracts control information for controlling the subscriber circuit (LC) 5, converts it into processed data d1 in a format compatible with the subscriber circuit (LC) 5, and selects the input terminal "0" side.
) 67 as the output data d, the subscriber circuit (LC
) 5.

Also, the oscillator (PLL) 62. which is receiving the fault detection signal e (=“θ”). is the oscillator (PL
L) Similarly to 62, the clock signal cfk is extracted from the data d arriving from the transmission line 7, and the extracted clock signal c
An internal clock signal c/ that is phase-synchronized with fk is generated and supplied to the timing generation circuit 1 (TG) 63 and the like.

The timing generation circuit (TG) 63 also includes an oscillator (PL).
L) 62 generates various timing signals based on the internal clock signal cfk+ supplied from the data processing unit (
DP) 61, off signal generation circuit (OG) 65, etc., inside the remote control device (RCL') 6.

Further, the off signal generation circuit (OG) 65 generates an off signal Of based on the timing signal transmitted from the timing generation circuit (TG) 63, and transmits it to the input terminal "1" of the selection circuit (SEL) 67. Since the selection circuit (SEL) 67 selects the input terminal "0" side as described above, it is an OFF signal. f is never transmitted to the subscriber circuit (LC) 5.

In this state, when a failure occurs in the transmission line 7 at time t1, the failure detection circuit (ED) 64 detects an abnormality in the clock signal clk and frame signal f extracted from the data d, and a failure occurs in the transmission line 7. It is determined that the oscillator (PL
L)62. And the fault detection signal e transmitted to the protection circuit (CD) 66 is set to a fault detection state (for example, logic "1").

The oscillator (PL) that received the fault detection signal e (="1")
L)62. fixes the generated internal clock signal clk to the phase at time t1.

Therefore, the various timing signals generated by the timing generation circuit (TG) 63 also maintain the timing at time t1.

Furthermore, the protection circuit (GD) 66 that has received the failure detection signal e (="l") sets the selection signal S to be transmitted to the selection circuit (SEL) 67 to logic "l" as described above. SEL) 67 selects the input terminal "1" side as described above.

As a result, due to the fault that occurred in transmission line 7,
W) A disturbance occurs in the data d transmitted from l to the remote control device (RCL) 6, and as a result, the data processing unit (DP) 6
Disturbance also occurs in the processed data d that 1 transmits to the selection circuit (SEL) 67, but this is because the selection of the selection circuit (SEL) 67 is switched from the input terminal "0" side to the input terminal "1" side. , the off signal of generated by the off signal generation circuit (OG) 65 is transmitted to the subscriber circuit (LC) 5 as data d instead of the disturbed processed data d.

The subscriber circuit (LC) 5 that received the off signal of will no longer accept any calling signals from the subscriber 3 and will be in a blocked state. data transmitted via RCL) 6
The device is set to be able to receive any type of control information included in the .

Thereafter, at time t, the fault that occurred in the transmission line 7 is recovered,
When data d is resumed from the exchange (SW) l to the remote control device (RCL) 6 via the transmission line 7, the failure detection circuit (ED) 64 outputs the clock signal cI! extracted from the data d! Recovery from the fault is detected by the frame signal f, and the oscillator (PLL) 62. and protection circuit (GD) 6
6, the fault detection signal e is returned to the fault non-detection state (
= logic “0”).

The oscillator (PL) that received the fault detection signal e (="0")
L)62. is the internal clock signal cI! which is phase-synchronized with the clock signal Cfk extracted from the data d arriving from the transmission path 7 again. The oscillator (PLL) 62 generates
．． is the clock signal cI! at time t1! Since it was synchronized with the phase of oscillator (PLL) 62. The phase of the internal clock signal Clk, which is generated by the clock signal c, does not change.
I! Synchronize with k.

Therefore, the various timing signals generated by the timing generation circuit (TG) 63 are also synchronized with the clock signal cik without any fluctuation, and the data processing unit (DP) 61 normally extracts required control information from the data d even after time t2. Extraction and conversion of the data format into processed data d can now be performed.

However, some time (for example, about 500 milliseconds) elapses after time t2 until the data processing unit (DP) 61 outputs the normal processed data d.

- The blade protection circuit (CD) 66 is the fault detection circuit (ED) 6
When the fault detection signal e transmitted from 4 changes from logic "1" to logic "ON" at time t, the selection circuit (SEL) 67 is activated for a predetermined protection time T from time t2.
After holding the selection signal S transmitted to the logic "1" at logic "1", the setting is changed to logic "0" at time t3 after the elapse of the protection time T from time t2.

Note that the protection time T is set (for example, 1 second) to sufficiently exceed the time from when the data processing unit (DP) 61 resumes receiving data d until it is possible to output normally processed data d. There is.

The selection circuit (SEL) 67 changes the selection signal S transmitted from the protection circuit (GD) 66 from logic "0" to logic "L" at time t, so that the selection circuit (SEL) 67 inputs the selection signal to the input terminal "1".
In order to switch from the side to the input terminal “0” side, from time t3 onwards, the off signal o generated by the off signal generation circuit (OG) 65
Instead of f, the processed data d output from the data processing unit (DP) 61 is sent to the subscriber circuit (
LC)5.

The subscriber circuit (LC) 5 that had received the off signal of,
As mentioned above, any control information transmitted as output data d is subsequently received, the normal control process is restored, and normal service to the subscriber 3 is resumed.

As is clear from the above description, according to this embodiment, when a failure occurs in the transmission line 7, the remote control device (RCL)
6 is an oscillator (PLL) 62. The phase of the failure occurrence point t is determined by the internal clock signal cI! is held at 1, and an off signal Of is transmitted to the subscriber circuit (LC) 5 instead of the processed data d, including disturbance. ) 5 to restore the normal control process and transmit the normal processed data d, it is possible to restore normal service to the subscriber 3 without the need for the maintenance person to go to the remote location 200 one by one. becomes.

Note that FIGS. 2 to 4 are only one embodiment of the present invention, and for example, the failure detection means 300, the oscillation phase fixing means 4
The configurations of 00 and the blockage signal sending means 500 are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

It goes without saying that the remote subscriber accommodation system to which the present invention is applied is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the present invention, in the remote subscriber accommodating system, when the fault that has occurred in the transmission path is recovered and information is transmitted via the transmission path, the information is transmitted with the phase fixed by the oscillation phase locking means. Since reception starts immediately, and after the failure in the transmission path is recovered and the time is determined when normal information can be received, the information is transmitted to the subscriber circuit, so the subscriber circuit also immediately returns to the normal control process. This eliminates the need for maintenance personnel to go to remote locations one by one, improving the serviceability and maintainability of the remote subscriber accommodation system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a remote control device according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of various signals in FIG. 2, and FIG. 4 is a diagram showing an example of various signals in FIG. FIG. 5 is a diagram showing an example of a remote subscriber accommodation system to which the present invention is applied, and FIG. 5 is a diagram showing an example of a conventional remote control device. In the figure, ■ is a switch (SW), 2 and 3 are subscribers, 4 is a subscriber line, 5 is a subscriber circuit (LC), 6 is a remote control device (RCL), 7 is a transmission line, and 61 is a data processing Department (
DP), 62 and 62° are oscillators (PLL), 63 is a timing generation circuit (TG), and 64 is a failure detection circuit (E
D), 65 is an off signal generation circuit (OG), 66 is a protection circuit (GD), 67 is a selection circuit (SEL), 100
is an exchange, 200 is a remote location, 300 is a fault detection means, 4
00 is the oscillation phase fixing means, and 500 is the blocking signal sending means. Diagram 4 of the stem

Claims (3)

[Claims] (1) Subscriber circuit (5) installed at a remote location (200)
accommodates a subscriber (3), and connects the subscriber circuit to a transmission path (7).
In a remote subscriber accommodating system connected to the exchange (1) via the remote location, information transmitted to the subscriber circuit via the transmission line is monitored, and when a failure occurs in the transmission line, failure detection means (300) for detecting whether or not a failure has occurred in the transmission line; and oscillation for fixing the phase of the oscillator provided at the remote location when the failure detection means detects that a failure has occurred in the transmission line. phase locking means (400); when the failure detection means detects that a failure has occurred in the transmission line, a predetermined blockage signal is generated in place of the information arriving from the transmission line; After a predetermined period of time has elapsed since the fault detection means detected recovery from the fault that occurred, the blockage signal is transmitted to the subscriber circuit, and the blockage signal is transmitted to the subscriber circuit. Blockage signal sending means (500) for transmitting to subscriber circuit
A remote subscriber failure handling method characterized by providing: (2) The remote access system according to claim 1, wherein the blocking signal blocks the subscriber circuit from the accommodated subscriber and makes it possible to receive all information arriving from the transmission path thereafter. Personal disability handling method. (3) The remote access according to claim 1, wherein the predetermined time is set to a time sufficient for the information arriving from the transmission path where the failure has been recovered to recover to a normal state. Personal disability handling method.