JPH0564274A - System for distributing synchronizing signal - Google Patents

Abstract

PURPOSE:To reduce the disorder of a synchronizing signal to a minimum, which is generated by redundant constitution with the high degree of freedom at the time of changing system constitution in a system where the synchronizing signal is distributed inside a time division exchange with a time division switch. CONSTITUTION:Synchronizing signal generating trunks 4 and 5 and synchronizing signal selection trunks 6 and 7 which are connected with the time division switch of duplex constitution inform a synchronizing signal system constitution controller 12 of the signal (a) when a fault occurs. Thus, the synchronizing signal system constitution controller 12 controls the time division switch 1 so as to set the combination of the both trunks, controls the synchronizing signal selection trunks 6 and 7 so as to select one of the synchronizing signals and distributes one of the signals which are phase-synchronized with a the input signal generated in synchronizing signal generating devices 4 and 5 which are generated so as to be outputted to call trunks 9-11 through the time division switch 1, the synchronizing signal selection trunks and 7 and a return device 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizing signal distribution system in a time division exchange.

[0002]

2. Description of the Related Art As a signal distribution system in a conventional time division switch, a tone source connection system for supplying various tone sources to a required channel and an announcement for supplying various announcements to a required channel. Two typical signal distribution methods of connection are used.
Two methods will be described with reference to the drawings.

As shown in FIG. 3, the former tone source connection system is composed of a time-division switch 31 having a dual structure of an active system and a standby system, a control unit 32 of the time-division switch 31 having a dual structure, and a duplex structure. The tone source device 33 and the call trunks 34 and 35 having a single configuration, and are provided between the time division switch 31 and the control section 32 and the time division switch 3.
An intersection exists between 1 and the tone source device 33, and the call trunks 34 and 35 are connected only to the active system of the time divisional switch 31. The tone signal from the active system of the tone source switch 33 is multi-connected in the active system of the time divisional switch 31 and supplied to the call trunks 34 and 35. The important point of this system is that the tone source device 33 is duplicated, and when the control unit 32 receives a failure report from the active system of the tone source switch 33 via the time division switch 31, only the tone source switch 33 is activated. Switch and use the standby system.

Next, in the latter announcement connection system, as shown in FIG. 4, a time division switch 41 having a duplex configuration is used.
And a control unit 42 of the time-division switch configured as a duplex,
Announcement trunks 43, 44 with a single configuration
And the call trunks 45 and 46 of the same configuration, the time divisional switch 41 and the control unit 42 are the same as the time divisional switch 31 and the control unit 32 described in the tone source connection method, and the announcement is made. The trunks 43 and 44 and the call trunks 45 and 46 are connected only to the active system of the time divisional switch 41.

The announcement trunks 43 and 44 have the same announcement content, and
Trunk 43 is the current system, announcement trunk 4
4 is a standby system, the announcement trunk 43
The announcement of the above is multi-connected in the active system of the time division switch 41 and supplied to the call trunks 45 and 46. The important point of this system is that the announcement trunks 43 and 44 are configured as a single unit,
Upon receipt of a failure report of the announcement trunk 43 via the time division switch 41, the control unit 42 closes the announcement trunk 43 and uses the announcement trunk 44.

[0006]

When a synchronizing signal is distributed by using the conventional signal distribution system in the exchange, both the tone source connection system and the announcement connection system control the switching process between the active system and the standby system. Since it is performed under the control of the time division switch by the unit, the time from the occurrence of a failure in the active system to the restoration becomes more problematic as the cycle of the synchronization signal becomes shorter. Further, since the conventional apparatus configuration does not consider the phase period between the active system and the standby system, there is a problem that phase shift occurs due to switching of the active system and the standby system in terms of distribution of the synchronization signal. ..

[0007]

DISCLOSURE OF THE INVENTION The present invention is a time-division switch for distributing a synchronization signal created in a time-division switch through a time-division switch composed of a dual system consisting of an active system and a standby system. , Which is connected to the current system and creates a signal that is phase-synchronized with the input synchronization signal or that creates a synchronization signal independently and performs phase adjustment before outputting it to the time-division switch. A plurality of synchronizing signal selecting means for selecting one of a plurality of synchronizing signals created by each synchronizing signal creating means inputted from the division switch and outputting it to the time division switch, each synchronizing signal creating means and each synchronizing signal distribution According to the failure notification from the means, the combination of the input and output of both means is set to control the connection path of the synchronization signal in the time division switch and to control the selection of the synchronization signal. It is obtained so as to constitute and means.

[0008]

According to the present invention, by the control of the control unit according to the failure notification from the plurality of synchronization signal generation means and the plurality of synchronization signal distribution means, the connection path of the synchronization signal path in the time division switch is set, The synchronization signal is selected by the synchronization signal distribution means.

[0009]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a synchronizing signal distribution system according to the present invention. The time divisional switch 1, the control unit 2 and the loopback device 8 are duplicated respectively, and the time divisional switch 1 and the loopback device 8 and the time divisional switch 1 and the control unit 2 are connected with a cross path. The sync signal generating trunks 4 and 5, the sync signal selecting trunks 6 and 7, and the call trunks 3, 9, 10 and 11 are connected to the active system of the time division switch 1 in a single configuration. Synchronous signal system configuration control device 1
2 and the maintenance operation terminal 13 are also connected to the active system of the control unit 2 in a single configuration. Sync signal generation trunks 4 and 5, sync signal selection trunks 6 and 7, and sync signal system configuration control device 12
During this period, the fault notification signal a and the system control signal b are configured to be input and output mutually. Reference numerals 401 and 501 are phase adjusters provided in the synchronization signal generating trunks 4 and 5, respectively.

FIG. 1 shows the flow of a synchronization signal when a synchronization signal from another station is received via the time division switch 1 and distributed via the call trunks 9, 10 and 11. The flow will be described. The synchronization signal is input to the time division switch 1 from another station via the call trunk 3,
The signals are input to the synchronization signal generating trunks 4 and 5 by the multi-connection in the time division switch 1. Although the synchronization signal generating trunks 4 and 5 output a signal phase-synchronized with the input signal to the control unit 2, the phase adjusters 401 and 501 in this case do not function and output the input signal as it is as a synchronization signal. By the multi-connection in the time divisional switch 1, the output of the sync signal generating trunks 4, 5 is the sync signal selecting trunk 6,
Input separately for both 7.

The synchronization signal selection trunks 6 and 7 select one of the inputs of the synchronization signal preparation trunks 4 and 5 according to an instruction from the synchronization signal system configuration control device 12 and output it to the time division switch 1. Here, assuming that the synchronization signal system configuration control device 12 selects the synchronization signal selection trunk 6 as the active system, the output of the synchronization signal selection trunk 6 is connected to the loopback device 8 by the connection in the time division switch 1, The output of the signal selection trunk 7 is left unconnected in the time division switch 1.

The folding device 8 is a synchronization signal selection trunk 6
The input from is returned as it is and output to another terminal in the time division switch 1, and the output of the return device 8 is the call trunks 9 and 1 by the multi-connection in the time division switch 1.
0 and 11 are distributed in the same phase. Now, assuming that a failure occurs in the sync signal creation trunk 4 with the sync signal creation trunk 4 and the sync signal selection trunk 6 as the active system, the sync signal creation trunk 4 sends a signal a to the sync signal system configuration controller 12.
Then, the synchronization signal system configuration control device 12 instructs the synchronization signal selection trunks 6 and 7 to switch the input from the synchronization signal preparation trunk 4 to the synchronization signal preparation trunk 5 by the signal b, and the control result Is output to the maintenance operation terminal 13 via the control unit 2.

If a failure occurs in the sync signal creation trunk 6 here, the sync signal creation trunk 6 notifies the sync signal system configuration controller 12 of the failure by the signal a, and the sync signal system configuration controller 12 controls. The synchronization signal generating trunk 6 and the loopback device 8 in the time divisional switch 1 through the section 2.
Is changed to the connection of the synchronization signal creation trunk 7 and the loopback device 8, and the control unit 2 displays the control result to the maintenance operation terminal 13
Output to.

FIG. 2 shows that the local station becomes a parent and the call trunk 9
FIG. 3 is a block diagram showing the flow of the sync signal when the sync signal is distributed to 10 and 11. FIG. The difference from FIG. 1 is that the phase adjusters 401 and 501 function, and when the synchronization signal preparation trunk 4 is an active system, the output of the synchronization signal preparation trunk 4 becomes an input of the synchronization signal preparation trunk 5 The input of the preparation trunk 4 is no input, and when the synchronization signal preparation trunk 5 is the operation system, the output of the synchronization signal preparation trunk 5 becomes the input of the synchronization signal preparation trunk 4 and the input of the synchronization signal preparation trunk 5 is not input. The time-division switch 1 is connected so that the one that becomes the active system of the synchronization signal generating trunks 4 and 5 becomes the parent and the one that becomes the standby system is in the point of subordinate synchronization.

In particular, the operation of the phase adjusters 401 and 501 will be described by taking the phase adjuster 401 as an example. When the synchronization signal preparation trunk 4 is the active system, the output signal is directly output to the time division switch 1 without phase adjustment. When the synchronization signal generating trunk 4 is a standby system, the output signal is advanced in phase so as to be in phase with the output signal of the synchronization signal generating trunk 5 and output to the time division switch 1. As a result, even if the system switching control between the synchronization signal generating trunks 4 and 5 is performed by the signal b from the synchronization signal system configuration control device 12, the phase shift of the synchronization signal due to the system switching is prevented.

Further, in FIGS. 1 and 2, the folding device 8 is provided.
By providing the connection between the synchronization signal selection trunks 6 and 7, the connection in the time division switch 1 is selected from the connection between the synchronization signal selection trunks 6 and 7 and the communication trunks 9, 10 and 11 when the system is switched. Trunk 6 and folding device 8
Alternatively, the processing in the time-division switch 1 is speeded up so that the control unit 2 only has to instruct the time-division switch 1 to change the connection between the synchronization signal selection trunk 7 and the loopback device 8.

[0017]

As described above, the present invention facilitates a plurality of synchronization signal generating functions in a time-division switch as a device having a single configuration, and provides a single configuration for selecting one of the created synchronization signals. By preparing a plurality of devices for both of them and connecting them to the time division switch and providing a dedicated control device for controlling the input / output combination of these devices, the instantaneous interruption time of the synchronization signal caused by the system configuration control is minimized. When the local station is the parent regarding the synchronization signal, there is an effect that the phase shift of the synchronization signal due to system switching does not occur. Further, since the synchronizing signal generating function and the selecting function are separated as a single device, there is an effect that a redundant configuration having a high degree of freedom is possible in addition to the duplication and maintenance is facilitated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a synchronization signal distribution system according to the present invention.

FIG. 2 is a block diagram showing an application example of FIG.

FIG. 3 is a block diagram of a conventional signal distribution system.

FIG. 4 is a block diagram of a conventional signal distribution system.

[Explanation of symbols]

 1 Time Division Switch 2 Control Units 3, 9, 10, 11 Call Trunk 4, 5 Sync Signal Creation Trunk 6, 7 Sync Signal Distribution Trunk 8 Folding Device 12 Sync Signal System Configuration Control Device 13 Maintenance Operation Terminal

Claims (1)

[Claims] 1. A synchronous signal distribution system for distributing a synchronous signal created in a time-division switch through a time-division switch composed of a dual system consisting of an active system and a standby system, which is connected to an active system of the time-division switch, A plurality of synchronizing signal generating means for generating a signal that is phase-synchronized with the input synchronizing signal or for independently generating a synchronizing signal and performing phase adjustment and then outputting to the time division switch, and the input from the time division switch. A plurality of synchronization signal selecting means for selecting one of the plurality of synchronization signals generated by the respective synchronization signal generating means and outputting it to the time division switch, the synchronization signal generating means and the synchronization signal distributing means. According to the failure notification from the above, the combination of the input and output of the both means is set to control the connection path of the synchronization signal in the time division switch and select the synchronization signal. A synchronizing signal distribution system characterized by comprising a control means for controlling.