JPH06164563A - Synchronizing signal reproducing/repeating system - Google Patents

Abstract

PURPOSE:To simplify a redundant constitution control method when a synchronizing signal in exchanges is system-identified and is redundantly constituted in a system where the synchronizing signal is repeated and transmitted through the use of a channel between the exchanges. CONSTITUTION:A pair of a zero system synchronous trunk 1 and a one system synchronous trunk 2, and more than a pair of a zero system repeater trunk 3 and a one system repeater trunk 4 are provided in a self exchange. The respective trunks independently generate the synchronizing signals, monitor the plural inputted synchronizing signals, select one input in accordance with a prescribed priority and correct the phases of the synchronizing signals which they themselves generate and output in accordance with the phases of the selected input signals. A master slave relation on synchronism is exclusively set by a master slave setting signal (d) in the zero system synchronous trunk 1 and the one system synchronous trunk 2. Thus, the synchronizing signals a1, a2, c1 and c2 are transmitted and received to and by the host exchange and the slave exchange.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for relaying and transmitting a synchronizing signal by using a communication path handled by a digital exchange.

[0002]

2. Description of the Related Art A system for relaying and transmitting a system synchronization signal to a lower device by utilizing a communication path handled by a digital exchange is already known. For example, Document 1 describes an application example in which a synchronization signal is transmitted between stations. Further, Document 2 describes a method of distributing a synchronization signal in the exchange.

Reference 1: Masami Yabuzaki, Seizo Onoue, Takemi Arita,
Junki Shinagawa, “Control of Channel Switching without Interruption in Digital Mobile Communication”, IEICE Transactions B-II, Vo
l. J73-B-II, No. 11, pp. 585-5
93 (November 1990).

Reference 2: Hironao Tanaka, "Synchronous Signal Distribution Method", Japanese Patent Application No. 3-246557 (1993, September 1991)
Application on the 2nd of a month).

[0005]

SUMMARY OF THE INVENTION In this conventional technique,
Although it is described in Documents 1 and 2 that a synchronization signal is transmitted between exchanges, a system or system for performing redundant configuration control when the synchronization signal itself between the exchanges is systematically divided and a redundant configuration is given. Was not mentioned.

Further, in Reference 2, a redundant configuration and a control method for synchronizing signal distribution in the own exchange are described. However, since the redundant configuration control method entrusts the decision to the exchange software, the control is performed to the exchange software. There was a problem that the processing became a burden.

Further, in Reference 2, when the sync signal generating trunks of both systems in the highest-level switch have a failure, the phase of the sync signal after restoration is output independently of the phase before the occurrence of the failure. However, there was a problem in that the synchronization signal phase of the exchanges would jump all at once.

[0008]

The present invention has a plurality of sync signal input terminals, and normally determines the normality of each input sync signal from the period information and system identification information included in the sync signal. One of the input synchronization signals is selected in accordance with a predetermined priority order, and phase correction is performed so that the cycle information of the synchronization signal independently output by the device itself has a predetermined phase difference from the selected synchronization signal. In addition, the signal to which the system identification information of the own device is output again as the synchronization signal of the own device, and when it is determined that all the input synchronization signals are abnormal, the phase before the abnormality is generated by stopping the phase correction process. Synchronous signal selection regeneration relay processing means for performing regeneration relay processing of holding and continuing to output the synchronization signal of its own device, and switch means for controlling whether or not to output the reproduction output synchronization signal to the output terminal of its own device. When When obtained by exchanging control signals between the different another device having the same function as its own device which is mounted on the same switching equipment, on the synchronization between the two devices master
The means for exclusively setting the slave relationship, the means for setting whether or not to operate as the highest-level exchange, and the case of operating as the highest-level exchange, in the case where the setting means sets the master, the plurality of Means for not selecting all of the input synchronization signals, and for setting all the remaining input synchronization signals except one specific input synchronization signal among the plurality of input synchronization signals when the slave is set And, the self-monitoring of the normality of the synchronization signal output of the self device is notified to the outside of the existence of a failure as a device alarm including the case where the self device is not mounted. A synchronous signal regeneration repeater having means for notifying the other device of the slave relationship to the other device as a slave is provided in the exchange.

[0009] Further, in the own exchange, the synchronization signal regeneration repeater is used as a trunk, and two pairs of power supply lines having separate knowledge are provided as a 0-system synchronization trunk and a 1-system synchronization trunk. Outputs a 0-system sync signal,
Under the condition that the 1-system synchronous trunk outputs the 1-system synchronous signal, the signal connection in the local exchange is made by connecting the master / slave setting control signal between the 2 synchronous trunks and inputting from the host exchange. 0 system synchronization signal and 1
The two synchronizing signals of the system synchronizing signal are connected to the two synchronizing trunks, respectively, and the synchronizing signal output of the 0 synchronizing trunk is inputted to the 1 synchronizing trunk to synchronize the 1 synchronizing trunk. Connection is made so that the signal output is input to the 0-system synchronous trunk, and each of the synchronous trunks determines the priority order at the time of input selection and the self-system synchronous signal from the host exchange as the first system.
In the exchange, the other system synchronizing signal from the host exchange is set to the second place and the other system trunk output is set to the third place to reproduce and output the synchronizing signal. This will be referred to as the first system because of the explanation given later.

In addition to the first system, the present invention also provides
The synchronous signal regenerating repeater is used as a relay trunk in the own exchange, and a plurality of pairs of 0-system and 1-system power supply systems are provided, and the 0-system synchronous trunk output and the 1-system synchronous trunk output of the first system are relayed. Each of the relay trunks has a configuration in which the relay trunk is configured to reproduce and output the synchronization signal after selecting the input of the own system synchronization signal with priority.
This will be referred to as the second system because of the explanation given later.

Further, the present invention provides a second system,
In the case of the highest-level exchange, the power supply system is separated for the 0 and 1 systems of the trunks of the first and second systems, and for the connection of the synchronization signal in the own exchange,
The self-system synchronizing signal from the lower exchange is input to the input terminal of the first priority of selection of the 0-system synchronous trunk and the first-system synchronous trunk, and the input terminal of the second priority of the selection priority of the internal exchange of the self-switch. The connection is changed so that one of the output trunks of the other system relay trunk is input, and normally, the selection priority of the input terminals for the 0 system synchronous trunk and the 1 system synchronous trunk is selected by the highest-order switch setting means. Set to not select the 1st and 2nd place of the
The master-slave relationship is valid only with respect to the input of rank. When it becomes necessary to reset the phase of the synchronization signal output by the highest-order exchange, the operation setting as the highest-order exchange is canceled to change the selection priority of the input terminals to the first and second positions. The top-level exchange is provided with a configuration that allows selection. This is called the third system.

The present invention also provides, in a third system,
Input the 0-system synchronization signal from the first lower-order switch to the input terminal of the first-order selection priority of the 0-system synchronization trunk, and input the 1-system synchronization signal of the second lower-order switch to the 0-system synchronization trunk selection priority. Input to the input terminal of the second place, the 1-system synchronization signal from the 3rd lower exchange is selected for the 1-system synchronization trunk.
Input to the second input terminal of the 4th lower exchange, and input to the input terminal of the 2nd place of the selection priority of the 1st system synchronous trunk of the 0th system synchronous signal of the 4th lower exchange, and it overlaps the designation of the 1st to 4th lower exchanges By changing the settings so that the synchronization signals output by up to four lower-level exchanges can be connected, and when the operation setting as the highest-level exchange is released, the selection priority of the 0-system and 1-system synchronous trunks The uppermost exchange is provided with a device configuration that allows one normal synchronization signal to be selected from a total of four input terminals of the second and second positions (fourth system).

The present invention also relates to the first to fourth systems.
In the synchronous trunk and the relay trunk used in the system, while switching means for controlling whether to output the reproduction output synchronizing signal to the output terminal of the own device and monitoring the power supply voltage and determining that the voltage is not more than a predetermined voltage. A means for sending a reset signal, a flip-flop set by a reset signal for setting the highest-level exchange and reset by the reset signal, and a synchronization which is an output of the synchronization signal selection reproduction relay processing means using the output of the flip-flop as a gate signal. It is also possible to provide a means for gated a signal and a switch means for directly controlling whether or not to output the gate output as a reproduction output synchronizing signal of the own trunk.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. For convenience of explanation, description will be made from FIG. FIG. 4 is a block diagram relating to transmission and reception of a synchronization signal between exchanges. The sync signal is a digital signal containing an information field and a system identification information field that change in a predetermined cycle, and the
It is redundantly configured with two system signals and is transmitted bidirectionally between digital exchanges using a communication path.

Basically, the synchronization signal is created by synchronizing the phases of the 0-system and 1-system synchronization signals in the highest-order exchange, and is regenerated and relayed in the order of the upper exchange 21, the own exchange 22, and the upper exchange 23. However, the description will be made focusing on the own exchange 22. The 0-system synchronization signal o1 and the 1-system synchronization signal o2 transmitted from the host exchange 21 are reproduced by the own exchange 22.
The 0-system synchronization signal p1 and the 1-system synchronization signal p2 are relayed and transmitted to the lower exchange 23. At this time, the own exchange 22
The same signals as the 0-system synchronizing signal p1 and the 1-system synchronizing signal p2 which are regenerated and relayed by themselves are transmitted to the host exchange 21 as the 0-system synchronizing signal q1 and the 1-system synchronizing signal q2, respectively. Therefore, the lower exchange 23 also transmits to the own exchange 22 the same signals as the synchronization signals regenerated and relayed to the exchanges under its control as the 0-system synchronization signal r1 and the 1-system synchronization signal r2.

Next, FIG. 3 will be described. FIG. 3 is a block diagram of a sync signal reproducing / relaying apparatus which is mounted on an exchange and forms the core of the present invention in one embodiment of the present invention. The sync signal selection reproduction relay circuit 11 has three input sync signals f1 and f.
2, f3 are input, and the period of each input synchronization signal and the normality of system identification are constantly monitored. Here, regardless of the system identification of f3, it is normal that the synchronization signal of the own system is input to f1 and the synchronization signal of the other system is input to f2, and if each input synchronization signal is normal, f1, f2 It is assumed that the input is selected by prioritizing the order of f3. The synchronization signal selection / regeneration repeater circuit 11 divides the clock signal g obtained in the own exchange to create and output an independently generated synchronization signal h, and the phase of the synchronization signal h depends on the phase of the input synchronization signal of the selection result. Then, a predetermined phase correction is performed. Further, when it is determined that the input synchronization signals f1, f2, f3 are all abnormal, the phase correction operation described above is stopped and the phase of the synchronization signal h is held in the state before the abnormality.

The synchronization signal h is input to the switch 12, and it is controlled according to the setting state of the switch 12 whether or not the synchronization signal h is output as the output synchronization signal i. The synchronization signal h is also input to the output synchronization signal monitoring circuit 13, and the output synchronization signal monitoring circuit 13 monitors the normality of the synchronization signal h based on the clock signal g and uses the synchronization output state signal j to synchronize the synchronization signal h.
The status monitoring result of is output.

The master / slave setting circuit 14 receives the master / slave control output signal m of another synchronous signal reproducing / relaying device mounted as a pair in the same exchange as the master / slave control input signal k of its own device. By doing so, the master-slave relationship in synchronization between the sync signal regeneration repeaters is exclusively determined and the status signal 1 is output.

The highest-level exchange setting circuit 15 indicates to the synchronization signal regeneration repeater 11 and the switch 12 whether or not the own exchange is the highest level by the highest-level exchange setting signal n.

The status signal 1 is input to the synchronization signal selection / regeneration / relay circuit 11 and the highest level exchange setting circuit 15 determines that the own exchange is the highest level.
If the result of the status signal l is a master, the sync signal selection / replay relay circuit 11 does not select any of the three inputs of the input sync signals f1, f2, f3. If the result of the status signal 1 is a slave, only the input synchronization signal f3 can be selected.

When the highest-order exchange setting circuit 15 instructs the synchronization signal selection / regeneration relay circuit 11 that the own exchange is not the highest, if the result of the status signal 1 is the master, the synchronization signal selection / regeneration relay circuit 11 11 is the input synchronization signal f
Two inputs 1 and f2 can be selected, and if the result of the status signal 1 is a slave, all three input synchronization signals can be selected.

The status signal l is also input to the output sync signal monitoring circuit 13, and when the sync signal h is normal, the status signal l is directly output to the master / slave control output signal m,
When an abnormality is detected in the synchronization signal h, the master / slave control output signal m is output with the device itself as a slave.

As described above, the characteristic of the synchronizing signal regenerating repeater shown in FIG. 3 is that one input is selected from a plurality of synchronizing signals input by its own hardware logic, and the signal after phase correction is selected. It is to reproduce and output as a synchronizing signal of the device.

Next, FIG. 1 will be described. FIG. 1 shows an embodiment of the present invention and is a block diagram in a switch other than the uppermost one on a sync signal relay.

The 0-system synchronous trunk 1, the 1-system synchronous trunk 2, the 0-system relay trunk 3, and the 1-system relay trunk 4 are the same as the synchronous signal regeneration repeater shown in FIG. The numbers 1, 2, and 3 in the block indicate the priority order when the input is selected. The 0-system input synchronization signal a1 from the upper exchange is the 1st-order input terminal of the 0-system synchronous trunk 1 and the 1-system. It is input to the input terminal of the second priority in the synchronous trunk 2. Also, the 1-system input synchronization signal a2 from the host exchange is
It is input to the first priority input terminal of the 1-system trunk 2 and the second priority input terminal of the 0-system synchronous trunk 1. The 1-system synchronizing signal b2 which is the output of the 1-system synchronizing trunk 2 is input to the input terminal of the 0-system synchronizing trunk 1 which has the 3rd highest priority, and the 1-system synchronizing trunk 2 has the 3rd highest priority of its input terminal. The 0-system synchronizing signal b1 which is the output of the 0-system synchronizing trunk 1 is input. A master / slave setting signal d is input / output between the 0-system synchronous trunk 1 and the 1-system synchronous trunk 2 and corresponds to the master / slave control input signal k and the master / slave control output signal m in FIG. Therefore, the master-slave relationship in synchronization between the 0-system synchronous trunk 1 and the 1-system synchronous trunk 2 is exclusively set.

The output b1 of the 0-system synchronous trunk 1 is input to the first-priority input terminal of the 0-system relay trunk 3 and the second-priority input terminal of the 1-system relay trunk 4, and the 1-system synchronous trunk 2 Output b2 is input to the first priority input terminal of the 1-system relay trunk 4 and the second priority input terminal of the 0-system relay trunk 3.

The relationship of the sync signals between FIGS. 1 and 4 is shown in FIG.
Considering mainly the own exchange 22 of FIG.
1, a2 correspond to the signals o1 and o2 in FIG. 4, and the signals c1 and c2 in FIG. 1 correspond to the signals p1 and p2 and q1 and q2 in FIG.

The characteristic of the sync signal regeneration relay system shown in FIG. 1 is that in the exchanges other than the highest one, the synchronization signal from the upper exchange is sent to the subordinate exchanges by the hardware of the 0-system and 1-system synchronization trunks and relay trunks. It is in the point of reproduction and relay by wear logic.

Next, FIG. 2 will be described. FIG. 2 is a block diagram showing an embodiment of the present invention for the highest-level switch on the synchronization signal relay.

FIG. 2 is the same block diagram as FIG. 1 except that the 0-system synchronous trunk 1 and the 1-system synchronous trunk 2 have different signal connections to the first and second priority input terminals. ing. In FIG. 2, the 0-system synchronization signal e1 from the lower exchange is input to the 0-system synchronous trunk 1's 1st-priority input terminal, and the 1-system synchronization trunk 2's 1st-priority input terminal is input. , The 1-system synchronization signal e2 from the lower exchange is input. Further, the 1st system output synchronizing signal c2 which is the output of the 1st system relay trunk 4 is input to the input terminal of the 2nd highest priority of the 0 system synchronous trunk 1, and the 2nd highest priority input of the 1st system synchronous trunk 2 is input. The 0-system output synchronization signal c1 which is the output of the 0-system relay trunk 3 is input to the terminal.

The relationship of the sync signals between FIGS. 2 and 4 is shown in FIG.
Considering mainly the own exchange 22 of FIG.
1, e2 correspond to the signals r1 and r2 in FIG. 4, and the signals c1 and c2 in FIG. 2 correspond to p1 and p2 in FIG.

Next, FIG. 5 will be described. FIG. 5 is also a block diagram showing an embodiment of the present invention for the highest-level switch on the synchronization signal relay.

FIG. 5 is a block diagram in which the signal connection to the input terminals at the first and second priority levels of the 0-system synchronous trunk 1 and the 1-system synchronous trunk 2 in FIG. 2 is changed. The difference in signal connection is that the 0-system synchronization signal v1 from the lower exchange is connected to the input terminals of the 0-system synchronous trunk 1 having the first priority and the 1-system synchronous trunk 2 having the second priority.
v4 is input, and the 1-system synchronization signals v2 and v3 from the lower exchange are input to the input terminals of the 0-system synchronous trunk 1 having the second priority and the 1-system synchronous trunk 2 having the first priority. And all of the above lower exchanges allow different things.

The relationship of the sync signals between FIGS. 5 and 4 is shown in FIG.
Considering mainly the own exchange 22 of FIG.
1, v3 correspond to the signals r1 and r2 in FIG. 4, and the signals v2 and
v4 corresponds to signals r1 and r2 sent by another lower exchange, and signals c1 and c2 in FIG. 5 correspond to p1 and p2 in FIG.

The characteristics of the synchronous signal regeneration relay system shown in FIGS. 2 and 5 are that the above-mentioned exchange is caused by an accident such as a failure of both system 0 synchronous trunk 1 and system 1 synchronous trunk 2 in the uppermost exchange. Output sync signals c1 and c2
The point is to provide a means to prevent the phase jump when it is known that the phase jumps with the restoration of the fault.

FIG. 6 is constructed for the purpose of improving the maintainability of the power supply voltage fault in the synchronous trunk among the faults in the highest level exchange. The power-on reset circuit 100 monitors the power supply voltage Vs, and outputs the L-level reset signal t while the power supply voltage is below a predetermined voltage. Setting signal n as the highest-level exchange
Is inverted by the inverter 106 to become the set signal s.
The NAND elements 101 and 102 form a flip-flop by feeding back each output to one of the inputs, and are set when the above-mentioned signal s becomes L level and the signal t becomes L level. It is reset by.

The gate signal u is a signal obtained by inverting the output of the flip-flop by the inverter 108, and becomes the H level only while the flip-flop is set and the AND
It is input to the element 103. The switch 109 is a switch that directly controls the output of the output synchronization signal i.
The output of 09 is pulled up and input to the AND element 103. Normally, the switch 109 is opened to operate, and the synchronizing signal h is output as the output synchronizing signal i while the gate signal u is at the H level.

With the above configuration, especially when a voltage failure occurs in the synchronous trunk of the highest-level exchange, the flip-flop is reset and the output of the synchronization signal is stopped at the time of occurrence, so that the synchronization in the highest-level exchange is synchronized. The operation of resetting the signal phase can be limited to the work of the maintenance person.

The exchange procedure of the synchronous trunk and the relay trunk will be described below by taking the system adopting FIGS. 5 and 6 as an example. If the synchronous trunk or transit trunk fails when it is not the highest-level switch, make the spare trunk to be newly installed the same as the trunk to replace the switch setting before mounting, and after confirming the cancellation of the highest-level switch setting. The switch 109 is closed.
After mounting, the trunk may be replaced by opening the switch 109 after confirming that the synchronous output status signal j is normal.

On the other hand, the recovery procedure for the failure of the synchronous trunk and the transit trunk in the highest-level switch is as follows. If the synchronous trunk of the highest-level switch fails in both systems, system 0 synchronous trunk 1 and system 1 synchronous trunk 2
Removes both from the mounting and replaces one with the spare trunk. At this time, before mounting the spare trunk, cancel the setting of the highest-level switch setting circuit 5 of FIG. 3 as the highest-level switch,
Further, the switch 109 in FIG. 6 is closed. By this operation, the spare trunk can select the input terminals of the first and second priority levels as inputs immediately after mounting, but cannot output the synchronization signal. After mounting this spare trunk, it waits for the synchronous output state signal j in FIG. 3 to indicate normality, and returns to the original setting that the own exchange is the highest in the highest exchange setting circuit 5 in FIG. By this resetting, the input terminals having the first and second priority orders cannot be selected again, and at the same time, the output stop setting due to the detection of the power failure is canceled.

Next, by opening the switch 109 in FIG. 6, the synchronizing signal h can be output as the output synchronizing signal i. By the above operation, the phase before the synchronous trunk becomes a failure in both systems can be recovered by the phase information from the lower exchange, and the synchronous trunk implemented by the above procedure can be restored as the master in the uppermost exchange.

With respect to the remaining synchronous trunks of other systems, the setting of the spare trunk is set as the highest-level switch, and the switch 109 is mounted with the switch 109 closed. Figure 3 after mounting
The synchronous output state signal j of is normal and has the third priority.
When it is confirmed that the uppermost input terminal has been selected, the setting as the highest-order exchange is once canceled and then reset again, and the switch 109 is opened to output the synchronization signal.
By the above operation, the output stop setting based on the detection of the power failure immediately after the mounting is released, and the replaced trunk can be restored as the slave side synchronous trunk in the highest-level switch.

Next, an explanation will be given of the exchange procedure when the synchronous trunk of the highest-level exchange has a one-sided failure.
Since the other system synchronous trunk has already been normally operated by the slave setting signal d and is operating as the master, the procedure is the same as that of the slave synchronous trunk in the case of the above two system failures.

Further, when the relay trunk of the highest-level switch fails, after confirming that the synchronous trunk is normal, the spare trunk is set as the highest-level switch and the switch 109 is set. Implement with closed. After mounting, confirm that the synchronous output status signal j in FIG. 3 is normal and that the input terminal with the first or second priority is selected, then cancel the setting as the highest-level switch once. The power failure detection immediately after mounting is canceled by resetting immediately after the switch 109
Open and output the sync signal. If there is a failure in the sync trunk, the sync trunk is first restored before the above work.

Finally, when it is known that the above-mentioned failure factor is a power failure, it is not necessary to replace it with a spare trunk, and the original trunk is used to cancel the setting as the highest-order switch once and then immediately restart it. The work of setting and canceling the output stop setting due to the detection of a power failure immediately after mounting may be performed in the order of the synchronous trunk and the relay trunk.

[0046]

As described above, according to the present invention, in the exchanges other than the highest one, the synchronization signal from the upper exchange is sent to the subordinate exchanges by the hardware between the 0-system synchronous trunk 1 or the 1-system synchronous trunk 2. Since the synchronization signal can be selected and regenerated and relayed by logic, there is an effect that the processing load on the exchange software regarding the redundant configuration control of the synchronization signal between the exchanges can be reduced. further,
By installing a relay trunk that has the same function as a synchronous trunk in the local exchange in pairs of system 0 and system 1, the reliability of the regeneration processing of the synchronization signal in the exchange is improved and the maintenance of the synchronous trunk is performed. It also has the effect of improving the sex.

In the highest-level exchange, the 0-system synchronous trunk 1 and the 1-system synchronous trunk 2 are connected by connecting the synchronization signals in the own exchange as shown in FIGS.
Even if the two systems become a failure in both systems, there is an effect that it is possible to prevent the phase jump from occurring when the failure is recovered with respect to the phase of the synchronization signal output to the subordinate switch.

Further, by providing the switch circuit shown in FIG. 6 in the synchronous trunk and the relay trunk, even when each trunk is mounted in the highest-level switch, it is possible to stop the output of the synchronous signal when a power failure occurs. The effect is that the restoration work can be delegated to the maintenance person without fail.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention and a case other than a highest-order switch on a synchronization signal relay.

FIG. 2 is a block diagram showing an embodiment of the present invention and is a case of a highest-level switch on a synchronization signal relay.

FIG. 3 is a block diagram showing an example of a synchronization signal regeneration repeater as a trunk in FIGS. 1 and 2.

FIG. 4 is a block diagram showing an example of transmitting a synchronization signal between exchanges.

FIG. 5 is a block diagram of another example in the case of the highest-level switch on the synchronization signal relay, similar to FIG. 2, showing an embodiment of the present invention.

6 is a block diagram showing an example of a switch 12 in FIG.

[Explanation of symbols]

 1 0-system synchronous trunk 2 1-system synchronous trunk 3 0-system relay trunk 4 1-system relay trunk 11 Synchronous signal selective regeneration relay circuit 12 Switch 13 Output synchronous signal monitoring circuit 14 Master / slave setting circuit 15 Top exchange setting circuit 21 Upper exchange 22 Own switch 23 Lower switch 100 Power-on / reset circuit 101 NAND element 102 NAND element 103 AND element 106 Inverter 108 Inverter 109 Switch a1 0-system input synchronization signal a2 1-system input synchronization signal b1 0-system synchronization signal b2 1-system synchronization signal c1 0 system output synchronization signal c2 1 system output synchronization signal d Master / slave setting signal e1 0 system input synchronization signal e2 1 system input synchronization signal f1 input synchronization signal f2 input synchronization signal f3 input synchronization signal g clock signal h synchronization signal i output Sync Signal j Synchronous output status signal k Master / slave control input signal l Status signal m Master / slave control output signal n Top-level exchange setting signal o1 0 system synchronizing signal o2 1 system synchronizing signal p1 0 system synchronizing signal p2 1 system synchronizing signal q1 0 system synchronization signal q2 1 system synchronization signal r1 0 system synchronization signal r2 1 system synchronization signal s set signal t reset signal u Gate signal y1 0 system input synchronization signal y2 1 system input synchronization signal y3 1 system input synchronization signal y4 0 system input Sync signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04L 12/24 12/26 H04Q 11/04 304 K 9076-5K

Claims (6)

[Claims] 1. A sync signal regeneration relay system for relaying and transmitting a sync signal as a digital signal containing a field in which information changes periodically and a field indicating a system identification, using a communication path handled by a digital exchange. It has a plurality of input terminals for synchronizing signals, always judges the normality of each input synchronizing signal from the period information and the system identification information, and selects one of the input synchronizing signals according to a predetermined priority order, The phase information of the periodic signal that is output independently is phase-corrected so that it has a predetermined phase difference from the selected and input synchronizing signal, and the signal to which the system identification information of the own device is added is synchronized with the own device again. If it is output as a signal and it is determined that all of the input synchronization signals are abnormal, the phase correction processing is stopped to maintain the phase before the occurrence of the abnormality and continue the output of the synchronization signal of the own device. Synchronous signal selection reproduction relay processing means for performing live relay processing, switch means for controlling whether or not to output the reproduction output synchronization signal to the output terminal of the own device, and the same function as the own device installed in the same exchange. When a control signal is exchanged with another device having
In the case where the master / slave setting means for exclusively setting the synchronous master / slave relationship between the two devices, the means for setting whether or not to operate as the highest-level exchange, and the case of operating as the highest-level exchange, When the master is set by the setting means, all of the plurality of input synchronization signals are not selected, and when the slave is set, except for one specific input synchronization signal among the plurality of input synchronization signals. A means to set not to select all the remaining input sync signals, and self-monitor the normality of the sync signal output of the own device to notify the external existence of a fault as a device alarm even when the own device is not mounted. , When the device alarm occurs in the device itself, the notification that the device itself is always notified as the slave to the other device regarding the master / slave relationship. Synchronizing signal reproduction relay method characterized by comprising a synchronization signal regeneration repeater and a stage. 2. A self-switching apparatus is provided with two synchronous power regeneration repeaters as trunks, which are separated from each other in a power supply system, as a 0-system synchronous trunk and a 1-system synchronous trunk, and the 0-system synchronous trunk is 0. Output a system synchronization signal,
The signal connection in the local exchange is made under the condition that the system synchronous trunk outputs the system 1 synchronous signal, and the control signal for setting the master / slave is connected between the two synchronous trunks, and the signal is input from the host exchange. A system synchronizing signal and a system 1 synchronizing signal are connected so as to be inputted to the two synchronizing trunks respectively, and a synchronizing signal output of the system 0 synchronizing trunk is inputted to the system 1 synchronizing trunk. Connection is made so that the synchronization signal output of the system synchronization trunk is input to the 0 system synchronization trunk, and each of the synchronization trunks has the priority at the time of input selection, with the own system synchronization signal from the upper exchange being the first.
2. The exchange is provided with a structure for setting the other-system synchronization signal from the higher-order exchange to the second place and setting the other-system synchronization trunk output to the third place to reproduce and output the synchronization signal.
Synchronous signal regeneration relay system described. 3. The self-exchanger is provided with a plurality of pairs by dividing the 0-system and 1-system including the separation of the power supply system as the relay trunk of the synchronous signal regeneration repeater, and the 0-system synchronous trunk output and 1-system. A system is provided with a configuration in which an output of a system synchronous trunk is input to each of the relay trunks, and each of the relay trunks sets the input priority of its own system synchronization signal to a high level and reproduces and outputs the synchronization signal. Item 2. The sync signal regeneration relay system according to item 2. 4. When the self exchange is the highest exchange, the power supply system is separated for the 0 system and the 1 system of the trunk, and the connection of the synchronizing signal in the self exchange is performed. The self-system synchronization signal from the lower exchange is input to the input terminal of the first priority of the 0-system synchronous trunk and the 1-system synchronous trunk, and the other system in the self-switch is input to the second input terminal of the selection priority. The connection is changed so as to input one output signal of the relay trunk, and normally, the 0th-system synchronous trunk and the 1st-system synchronous trunk are set to the input terminal selection priority order by the highest conversion setting means. By not selecting the 1st and 2nd positions, the master / slave relationship is operated only for the input of the 3rd selection priority, and the phase of the synchronization signal output by the highest-level switch is Need to reconfigure In the case of occurrence of the above, it is provided that the highest exchange has a configuration for canceling the operation setting as the highest exchange so that the first and second positions of the input terminal selection priority can be selected. 4. The sync signal regeneration relay system according to claim 2 or 3. 5. The signal connection to the input terminals of the 0-system synchronous trunk and the 1-system synchronous trunk in the highest-level exchange is changed so that the 0-system synchronous signal from the first lower exchange is selected as the 0-system synchronous trunk. Input to the input terminal of the first priority, input the 1-system synchronization signal of the second lower exchange to the selection terminal of the selection priority of the 0-system synchronous trunk, and input the 1-system from the third lower exchange. The synchronization signal is input to the first input terminal of the selection priority of the 1-system synchronous trunk, and the 0-system synchronization signal of the fourth lower exchange is selected as the selection priority of the 1-system synchronous trunk.
Of the synchronization signals output by a maximum of four lower exchanges when the uppermost exchange settings are canceled by making a connection that allows input to the input terminals of 5. The synchronization signal regenerating and repeating system according to claim 4, wherein a configuration for selecting a normal one from the inside is provided in the highest-order exchange. 6. The switch means for controlling the output of the reproduction output sync signal by the sync signal regeneration repeater, the means for identifying itself as a trunk whether it is a synchronous trunk or a relay trunk, and monitoring the power supply voltage. Means for sending a reset signal while the voltage is below a predetermined voltage; a flip-flop set by a signal notifying that the highest-order exchange setting means is not the highest-order exchange and reset by the reset signal; and an output of the flip-flop. Gate means for outputting the synchronization signal which is the output of the synchronization signal selection reproduction relay processing means only while the flip-flop is set as the gate signal, and whether the gate output is further output as the reproduction output synchronization signal of the own trunk. The synchronizing signal according to claim 1, further comprising a switch means for directly controlling whether or not the synchronizing signal is supplied. Regeneration relay system.