JPH0683495B2 - Line setting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is for switching lines, and consists of a three-stage switch of time switch (T) -spatial switch (S) -time switch (T). Regarding the line setting device.

"Prior Art" Conventionally, a line setting device such as a synchronous multiplex converter is T-S-T.
This switch is required to have high reliability because all the signals are intensively processed by this switch. For this reason, the switches of T, S, T and the links between the switches have adopted a complete duplex redundant configuration of the N system (when normal) and the E system (when abnormal). FIG. 4 shows a basic block structure of a conventional double-layered T-S-T three-stage switch, and FIG. 5 shows a link portion. Multiple time switch blocks T _{1 to} T
_In each block, for example, in block T ₁ , in the T switch section 1, a plurality of highway interface circuits 11 are connected to the serial-parallel conversion multiplexing circuit 12, and a plurality of highways are connected in parallel for each channel. Is converted into and multiplexed. This parallel multiplexed output is supplied to the working T switch (time switch) 13N and the spare T switch 13E. The outputs of the working T switch 13N and the spare T switch 13E are supplied to the S switch unit (spatial switch) 3 through the link unit 2. Other Block T ₂
Through T _M is also the output of the current T switch and preliminary T switch is supplied via a link section 2 to the S switch section 3.

The link unit 2 is duplicated into a working N and a backup E, and S
The switch unit 3 is also doubled into a working N and a spare E.
The output of the S switch unit 3 are respectively connected through a link portion 4 of the output side T switch unit 5 of the block T ₁ through T _M. As shown for block T _'1 to T switch section 5, the working T switch 14N, pre T switch 14E is provided, the outputs of the working N and spare E of the duplex link portion 4 Supplied. The working T switch 14N and the spare T switch 14E are switched and selected by the N / E switching circuit 15,
The output is converted into a serial signal for each communication path by the parallel-serial conversion / separation circuit 16 and is demultiplexed and output to a plurality of corresponding highways through a plurality of interface circuits 17.

The link unit 2 is a time switch block as shown in FIG.
As shown in the T switch section 1 of T ₁ , the working T switch 13N is an N bit which is parallel to each channel in the highway and is supplied in parallel to the N working T side link circuits 21 of the links J _{11 to} J _1N . these links J ₁₁ through J _1N working T side link circuit 21N is active S side link circuit of one bit first link J ₁₁ working S switch 18N of the N spatial Suitsuchiburotsuku S ₁ to S _N of the S switch portion 3 Linked to 22N. The space switch block S ₁ has S switch 18N, which has M number of time switch blocks T _{1 to} T _M , each 1st bit link J _{11 to} J.
_M1 of the working T side link circuit 21N are respectively linked connected to the M active S side link circuit 22N link J ₁₁ through J _M1.
The space switch block S ₂ is linked to the working T-side link circuit 21N of the second bit links J _{12 to} J _M2 of _M time switches T _{1 to} T _M , respectively. The same connection is made thereafter. The pre-T switch 13 of each block T ₁ through T _M
Similarly, the link connection between the blocks S _{1 to SN and} the spare S-side link circuit 21E on the side of the T switch 13E and the spare S-side link circuit 22E on the side of the S switch 18E is also performed.

That is, in the conventional case, the T switch is doubled to 13N and 13E, and the S switch is also doubled to 18N and 18E. Correspondingly, the link unit 2 also links the link circuits 21N and 22N and the link connection between them. The link circuits 21E and 22E and the link connection between them are duplicated. Further, the link portion 4 is also duplicated like the link portion 2. With this dual configuration, the N system or E system is selected by the N / E switching circuit 15 in the T switch unit 5.

High reliability can be obtained by adopting a duplex configuration in this way, but the scale of the line setting device is twice as large as that of a single configuration. Economic efficiency is poor due to increase.

Due to the recent development of LSI, T switch and S switch are LSI
The size of the line setting device depends on the size of the link sections 2 and 4 between the T switch and the S switch. The circuit size of the link units 2 and 4 rapidly increases as the number of highways entering the T switch increases. In particular, the links with all the T switches are concentrated in the S switches, so that the ratio of the links is large. Therefore, in order to reduce the scale of the line setting device, it is essential to reduce the scale of the link section.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line setting device capable of reducing the circuit scale of the link section between the T switch and the S switch against the increase in scale due to the redundant redundancy configuration.

"Means for Solving the Problems" In the present invention, in the line setting device based on the dual redundant configuration, only the link part is completely connected in order to reduce the scale of the link part between the T switch and the S switch. Not heavy
N + m spare redundant configuration, that is, m for the number N of working links
Of the m backup links, any one or more of the T switches and the N working links connected to each other are provided.
One or more connections can be switched and connected. Further, a switching circuit for switching and connecting N working T side link circuits and m spare T side link circuits for each time switch block, and N working S side link circuits for each S switch block, A switching circuit for switching and connecting m spare S-side link circuits, M × N spare T-side link circuits, and M × N
A spare link connecting switch that allows arbitrary connection between the N spare S side link circuits is provided. In this way, it is possible to switch the active and standby links without interruption with respect to the active N links with the standby m links. With the conventional technique, the link between the T and S switches has an N + m spare redundancy configuration, and the switching between the working link and the spare link is automatically performed without any interruption, so that a spare link that allows arbitrary connection between a plurality of spare links is possible. The difference is that a connection switch and its control circuit are provided.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 4 are designated by the same reference numerals, and the spare number m = 1. In the present invention, in the T switch unit 1, the working T switch 13N and the spare T switch 13E are switched by the N / E switching circuit 19 and connected to the N + m spare configuration link unit 6. S
The switch unit 3 and the T switch unit 5 are also connected by the N + m preliminary configuration link unit 7. As the number of accommodated lines increases, a plurality of blocks (T _{1 to} T _M ) form the T switch unit. The S switch unit 3 performs bit-compatible switching. S switch section 3 in the case of the sub connexion 8 bit multiplexed signal consists of eight basic blocks S ₁ to S _8. That is, N = 8.

A configuration example of the link unit 6 is shown in FIG. As in the conventional case, N active T-side link circuits 21N are provided for each of the time switch blocks T _{1 to} T _M , and M active S-side links are provided for each of the spatial switch blocks S _{1 to SN.} A circuit 22N is provided, and the link connection between these N × M active T-side link circuits 21N and the M × N active S-side link circuits 22N is the same as in the prior art of FIG.

In this embodiment the connection between the N pieces of working T side link circuit 21N and time Suitsuchiburotsuku T ₁ through T _M is respectively performed to the output of the N / E switching circuit 19. The one spare T side link circuit 21E is provided for each time Suitsuchiburotsuku T ₁ through T _M, selectively any one of the input side of the N working T side link circuit 21N by working / protection switchover circuit 23 Further, it can be switched and connected to the input side of the spare T side link circuit 21E.
The switching control is performed by the control circuit 24.

Meanwhile, one spare S side link circuit 22E for each space Suitsuchiburotsuku S ₁ to S _N are provided, the N working / protection switchover circuit 26 in correspondence with the N active S-side link circuit 22N is provided The output side of the N working / spare switching circuits 26 is connected in parallel to the working S switch 18N and the spare S switch 18E. Each of the N working / spare switching circuits 26 can switch between the output of the corresponding working S-side link circuit 22N and the output of one spare S-side link circuit 22E to output. The switching circuit is controlled by the control circuit 27.

Furthermore, each of the spare T-side link circuits 21E of _M time switch blocks T _{1 to} T _M , and N space switch blocks S _{1 to} S.
Any spare S side link circuit 22E of _M can be connected to each other by a spare link connecting switch 28. The connection control is performed by the control circuit 29. N + m spare link unit 7 between the S switch unit 3 and the T switch unit 5
Is also configured in the same manner as in FIG.

The spare link connection switch 28 has a N + m spare redundancy configuration for the links, and enables non-instantaneous disconnection switching between an active link and a spare link between each T switch and S switch.

Link J ₁₁ through J _1N each T switch unit is distributed to each block S ₁ to S _N of the S switch portion bits corresponding. Therefore, the backup links, for example, J _R1 and J _S1 cannot be fixedly connected one-to-one. For example, the second bit link of block T ₁
If J ₁₂ fails, the backup link J _R1 is blocked S ₂
Need to be connected to the spare link J _S2 . Therefore, the switching between the working link and the protection link is performed by the control signal based on the fault information of the link for each block T _i (i = 1 to M) and S _j (j = 1 to N) of the T switch and the S switch. This is done by sending the signals to the control circuits 24 and 27 to switch the working / standby and also sending a control signal to the control circuit 29 to switch between the spare links.

The effect of this embodiment is shown in FIG. Duplex configuration and N +
A link scale comparison between the TS switches when N = 8 and m = 1 with the m preliminary configuration is shown. Line 31 is a duplex configuration and line 32 is N +.
In the case of the m-preliminary configuration, the N + m preliminary configuration in which N = 8 and m = 1 can reduce the link scale by about 40% compared with the duplex configuration. With such a configuration, the scale of the line setting circuit is almost halved as compared with the case of duplication, and the economical efficiency is improved.

"Effect of the Invention" As described above, according to the present invention, the T switch and the S switch are provided.
The link between the switches is configured as N + m spare redundant configuration, and the switch 28 for connecting the spare link is provided, so that the link N +
m It is possible to take a redundant configuration, and there is an advantage that the scale of the line setting device can be greatly reduced by the three-stage switch configuration of T-S-T.

As an application field of the present invention, if it is applied to a communication path circuit of a digital exchange including a line setting device of a synchronous terminal device which is a communication device, the device can be downsized and the installation floor area can be reduced, and the economy per channel. Contribute to

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention in which links are N + m spare redundant configuration, FIG. 2 is a diagram showing a configuration example of the link portion, and FIG. 3 is the number of links for showing the effect of this embodiment. FIG. 4 shows the relationship between the T switch and the S circuit, and FIG. 4 shows a conventional T-S in which the T switch, the S switch, and the link have a complete duplex redundant configuration.
FIG. 5 is a diagram showing the structure of the link unit of the line setting device of the -T three-stage switch structure. 1,5: T switch part, 2,4,6,7: link part, 3: S switch part,
11, 17: Highway interface circuit, 12: Serial-parallel conversion multiplexing circuit, 13E, 13N, 14E, 14N: T switch, 15, 19, 23, 2
6: N / E switching circuit, 16: Parallel-serial conversion separation circuit, 18N, 18E: S switch, 21N: Working T side link circuit, 21E: Reserve T side link circuit, 22N: Working S side link circuit, 22E: Reserve S side link circuit, 24, 27, 29: switching control circuit, 28: spare link connection switch.

Claims (1)

[Claims] 1. M (M is an integer of 1 or more) time switch blocks, N (N is an integer of 1 or more) spatial switch blocks, and M time switch blocks are sequentially linked via a link section. In a line setting device in which the time switch block and the space switch block are duplicated in a normal time system and an abnormal time system, the link section has N number of T switches for each time switch block. A side working link circuit is provided, and M number of S side working link circuits are provided for each space switch block. These N × M number of T side working link circuits and M × N number of S side working link circuits are provided. They are connected to each other by a link, and each of the time switch and the space switch has m T-side spare link circuits (m is an integer of 1 to (N-1)) and m S-side spare link circuits. A path is provided, and N T-side working link circuits and m T-side link circuits can be switched and connected by a working / spare switching circuit for each time switch block, and M number for each space switch block. The S side working link circuit and m S side link circuits can be switched and connected by a working / spare switching circuit, and the m × N T measurement spare link circuits and the m × N S side spare links can be connected. A circuit setting device characterized in that it can be connected to each other arbitrarily by a switch for connecting a spare link.