JPS63276395A - Spatial switch - Google Patents

Abstract

PURPOSE:To replace a channel freely between highways even for various channels with different length by separating various channels with different bands once in the unit of channels and storing once it in a FIFO queue. CONSTITUTION:Channels arranged serially on incoming highways HI1-HIn are separated in parallel in the unit of channels by multiplexers/demultiplexers D1-Dn and given to FIFO queues FQ11-FQnm. The information on each channel outputted from the FIFO queues FQ11-FQnm is collected on multiplexers M1-Mm, multiplexed again in the unit of channels from parallel into serial and outputted to outgoing highways HO1-HOm. The length of each channel is recognized by providing an identifier between channels or using control information and each channel on the highways is demultiplexed or multiplexed based on the identifier or control information.

Description

[Detailed Description of the Invention] [Summary] A spatial switch that performs switching between channels on a plurality of highways, which is composed of a demultiplexer, a FIFO queue, and a multiplexer, and which switches between channels of the same length. Instead, channels of different lengths between highways can be exchanged.

[Industrial Application Field] The present invention relates to a space switch used in a time division switching system that performs switching using the order of channels. , relates to a space switch that allows channels of different quality to be exchanged.

With the development of an advanced information society, communication networks must handle broadband multimedia information. Even in a time division switching system, in order to handle broadband multimedia information while making effective use of communication resources, it is required to be able to exchange channels of different lengths.

In a time division switching system that satisfies such requirements, not only a conventional time switch (T switch) but also a space switch (S switch) is required to enable expansion of the scale of the network. Here, the time switch is a switch that has the function of changing the order of multiplexed signals within one highway, and the image switch has the function of changing the order of signals between each highway. It is a switch.

[Prior Art] FIG. 6 is a conceptual diagram of a conventional space switch used in a time division switching system. In the figure, Hll
, HI2 are input highways, TSWl, TSW2 are time switches that input channels on each input highway H11, l-112 and exchange the order of time slots, and SSW are time switches TSW1., HI2, respectively. This is a space switch that inputs information from TSW2, and consists of time division gates G11 to G22 formed at the intersections of the matrix. P1 to P3 are pulses that open and close the respective time division gates 011 to G22, and are output in the order of pi, p2, and P3 in synchronization with the channel (time slot). HOl and HO2 are this space switch SSW
It is connected to the exit highway.

The time switch TSW1 exchanges the order of time slots that are channels (represented by channels No. 1, 2, 3, and whose information is A, B, C) on the incoming buy weights IIl, and exchanges the order of time slots on the input bye weights IIl. A, C, B at 2゜3 respectively
so that it enters. Similarly, the time switch TSW2 exchanges the time slots of the channels on the incoming highway)-112, and the information Y,
Make sure that X and Z are included.

The space switch SSW controls the time division gate G'1 by the pulse P1 which is output in synchronization with the phase of the channel N001.
2. G21 opens, and pulse P2, which is issued in synchronization with the phase of channel N092, causes time-sharing gates G11. G
22 is opened, and pulse P3, which is similarly issued in synchronization with the phase of channel No. 3, causes the time division gates G12. G2
1 is opened, which causes A, A,
The signal containing the information of X and B is also exiting highway HO2.
A signal containing Y, C, and Z information is extracted.

FIG. 7 is a conceptual diagram of the operation of the space switch SSW that performs such an operation. Pulse P synchronized to channel phase
1. P2. By appropriately opening and closing each time-sharing gate at P3, channels can be switched between the incoming highways H11 and HI3 and the outgoing highways H11 and HO2.

[Problems to be solved by the invention] Conventional space switches exchange highway information by appropriately opening and closing time-sharing gates arranged in a matrix using pulses synchronized with the channel phase. . Therefore, each input highway H11, HI2
If the upper channels No. 011, No. 2, and No. 03 above all have the same length, band, and speed, a problem will occur.

FIG. 8 is a diagram for explaining this disadvantage.

When the channels on the individual highway H11, )-112 have different lengths, as shown in FIGS. 8(a) and (b), if information is exchanged using a conventional spatial switch, The channel on highway HOI, H02 is (C).

(As shown in (1), there is a problem in that channels intersect with each other or empty areas are created between channels.

The present invention has been made in view of these points, and an object of the present invention is to provide a spatial switch that allows switching between highways without any inconvenience, even for various channels with different lengths, bands, and speeds. It is said that

[Means for Solving the Problems] FIG. 1 is a block diagram of the principle of the space switch of the present invention. In the figure, )-I11 to H1n are input highways,
D1 to Qn are demultiplexers ([) emulti
plexer) and FQ11 to FQr+m are FIFO queues into which each channel information separated by the demultiplexers D1 to Dn is input. The FIFO queues FQ11 to FQnm are composed of shift registers, for example, and have a capacity capable of storing the longest information among the channels on the input highway. M1 to MI11 are multiplexers, and each FIFO
Select the information output from the queue and exit the highway HO
1 to HOIIl.

[Operation] The channels arranged serially on each person's highway 1''■1 to l-11n are connected to each demultiplexer Di(i-1, 2,
...m) in parallel in channel units, and the FrFO queue F Q 11 to F Q nm large input. The information on each channel output from the FIFO keys: x-FQll ~FQnm is collected in each multiplexer Mi (i-1゜2,...m), where it is multiplexed from parallel to serial again in channel units. And exit highway H○
1 to Hol1l. The length of each channel is determined by providing an identifier between the channels or by controlling information, and each channel on the highway is separated or multiplexed based on this identifier or control information.

FIG. 2 is a conceptual diagram of the operation of the space switch of the present invention.

Channels of different lengths on each highway can be freely interchanged between each highway as shown in the figure.

[Example] FIG. 3 is an example of a system in which the space switch of the present invention is applied to an elastane basket exchange method (EB method) to configure a star network. Here, the EB system is one of the time-division switching systems proposed by the applicant, and instead of using fixed-length time slots as in the conventional time-division line switching system, information is transmitted using variable-length baskets. Each basket is provided with an identifier to indicate the boundaries between the baskets, allowing baskets of different lengths to be handled uniformly. In the figure, Tij(i −
1,2,-n,j-1,2,・=ta) is a terminal, OM+ is a distributed module that is in charge of m terminals as a unit, and TM is a relay module that provides uplink for each distributed module DMi. ULi and downlink DLi
It is connected with.

FIG. 4 is a conceptual diagram showing a frame structure on a link in the EB system. In order to flexibly handle various bands, the EB system allows a variable length channel called a basket, indicated by 3i. Further, between each basket 3i, a basket identifier Bli is provided to indicate the boundary between the baskets 3i.

FIG. 5 is a block diagram of the structure of the relay module TM in FIG. 3, in which the space switch according to the present invention is used. In the figure, TSWil is a time switch connected to the uplink ULi, and exchanges the basket of frames on each uplink. TSWi2 is downlink D
A time switch connected to Li. The spatial switch SSW according to the present invention includes each time switch TSWi1 and T
It is installed between SWi2.

The operation of the star network configured as described above will be explained as follows.

Information on various bands from each terminal Tij is multiplexed in each distribution module DMi and sent to the relay module TM through the uplink ULj. Relay module TM (5th
4), the time switch TSW1i connected to the uplink UL1 sends the frame configured as shown in FIG. 4 sent via the uplink ULi to the downlink DL1. First, the order of the baskets is changed so that the basket sent to the downlink DL2 is placed second in the frame.

The demultiplexer Di of the spatial switch SSW separates the frame sent from the time switch 5W1i in units of baskets based on the basket identifier, and supplies the separated frames to the FIFO queues FQi 1 to FQi n , respectively. Each FIF
Each basket 3i once stored in the O queues FQi 1 to FQin is provided to each multiplexer Mj. Here, focusing on one multiplexer M1, each FIFO queue FQll is connected to its input terminal so that any one of the baskets of each frame on each person's highway H1 to H1n can be input.
, FQ21. FQ31. - A signal from FQn 1 is given. Similarly, focusing on the multiplexer M2, each FIFO queue FQ12°FQ22 . FQ32
．． - A signal from FQn 2 is given. Below, each multiplexer M3. The same applies to ~Mn.

Each multiplexer Mi selects and takes out baskets from each FIFO queue in a desired order, basket by basket,
Multiplex these. In the time switch TSWi 2,
The frame from the corresponding multiplexer Mi is transmitted to terminal 1 (Ti
The basket sent to terminal 2 (Ti 2 ) is placed in the first position in the frame, and the basket sent to terminal 2 (Ti 2 ) is placed in the second position in the frame.
The baskets are exchanged, such as the second basket, and sent to the downlink DLi.

By the above-described operation, baskets of different lengths can be freely exchanged between highways. In addition, when the above-mentioned operation is performed only by a time switch, in order to multiplex all the frames of each uplink ULi once, if the multiplicity of each uplink ULi is a, then
axn band is required, but according to this embodiment, this is not necessary.

[Effects of the Invention] As explained in detail above, the present invention separates various channels with different bands into channel units and stores them in a FIFO queue, thereby handling them as packets and processing each channel separately. It was designed to be exchanged between highways. Therefore, according to the invention, the length (bandwidth and speed)
It is possible to provide a spatial switch that can be freely switched between highways even for various channels with different values.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the space switch of the present invention, Fig. 2 is a conceptual diagram of the operation of the space switch of the present invention, and Fig. 3 is a start-up of the space switch of the present invention applied to the elastic basket exchange method (EB method). FIG. 4 is a conceptual diagram showing a frame structure on a link in the EB system; FIG. 5 is a configuration block diagram of a relay module in FIG. 3; The figure is a conceptual diagram of the configuration of a conventional space switch used in a time division switching system, FIG. 7 is a conceptual diagram of the operation of this space switch, and FIG. 8 is a diagram for explaining the problems of the conventional space switch. In Figure 1, HTI~HIn is the incoming highway, H01~)-1oll is the outgoing highway, and FQ11~FQ.
nIl is a FIFO queue D1 to Dn are FIFO queues, and M1 to Mm are multiplexers.

Claims (1)

[Claims] A space switch for switching between channels on a plurality of highways, comprising a plurality of demultiplexers provided corresponding to the plurality of highways and separating and extracting each channel on the highways. (
D1 to Dn), and multiple FIFO queues (FQ1
1 to FQnm); and a plurality of multiplexers (M1 to Mm) that select information output from each FIFO queue and output it to an output highway.