JPH05103356A - Spatial switch circuit - Google Patents

Abstract

PURPOSE:To simultaneously exchange and connect plural input-side serial signals respectively composed of plural time slots in a spatial axis direction and in the time base direction. CONSTITUTION:Serial signals (a)-(c) are multiplexed to time-division multiplex signals (d) by a multiplexer 10 and the signals (d) are alternately and serially accumulated in memories 11 and 12 at every frame. Then the contents of the memories 11 and 12 are alternately read out in desired order and the read-out outputs are selected by means of a selector 17. The selected output of the selector 17 is distributed to serial signals (m)-(o) by a separator 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space switch circuit used for switching and connecting transmission signals from a plurality of circuits.

[0002]

2. _{Description of the} Related Art As shown in a block diagram of a conventional example in FIG. 3, a plurality of transmission signals S _{i1 to} S _in are output to a plurality of output signals S _o1 to S in.
When selectively switching connection to the S _om, input 1-1～1-
A selector (hereinafter referred to as SEL) 3-1 to 3-M each having N and output terminals 2-1 to 2-M is provided, and a selection new signal is individually selected to the selection input terminals 4-1 to 4-M thereof. _{s1 to} S _sm are given, SEL3-1 to 3-M are controlled by these signals S _{s1 to} S _{sm, a} desired one is selected from transmission signals S _{i1 to} S _in , and output signals S _{o1 to} S _om are output. It is supposed to be sent out.

[0003]

However, the transmission signal S _i1
When S _in consists of a plurality of serial time slots, the configuration of FIG. 3 allows replacement in the spatial axis direction, but cannot replace in the time axis direction. If the replacement is required, a time switch circuit must be separately provided, which causes a drawback that the structure becomes complicated and the cost becomes high.

Therefore, it is an object of the present invention to provide a space switch circuit which can be replaced in the time axis direction.

[0005]

In order to achieve the above-mentioned object, the present invention provides a multiplexer that uses a plurality of serial signals as time division multiplexed signals, and alternately for each frame of the time division multiplexed signals. One is a write state and the other is a read state. In the write state, the time-division multiplexed signals are serially stored, and in the read state, the contents are read out in a desired order. A selector for selecting the output of the read-out state in both memories and a separator for separating the output of the memories into a plurality of serial signals.

[0006]

Therefore, by spatially interchanging the serial signals on the input side by designating the read order of the read states in the first and second memories as desired in response to the switching connection request. Also, it is possible to freely replace each time slot in each serial signal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to a block diagram of FIG. 1 showing an embodiment and a timing chart of FIG. 2 showing signals of respective portions in FIG. In FIG. 1, a multiplexer having input terminals 1-1 to 1-3 (hereinafter referred to as MP
X) 10 is provided, and the serial signals supplied to the input terminals 1-1 to 1-3 each include a plurality of time slots as shown in FIGS. One frame F is composed of slots, and these serial signals (a) to (c) are MP
The time-division multiplexed signal shown in FIG. 2D is generated by X10, and is given to the first and second memories (hereinafter, MM) 11 and 12.

The MM 11 is sequentially addressed by the address signal (e) from the input end 13 from the head address AO, and is set to the write state W by the write / read signal (f) from the input end 14. And this makes M
The time division multiplexed signal (d) is serially stored in M10.

On the other hand, the MM 12 is addressed by the address signal (g) from the input terminal 15 as a desired order, and becomes the read state R by the write / read signal (h) from the input terminal 16. As a result, the contents of the MM 12 are read out in a desired order.

Further, these states are alternately repeated for each frame F of the time division multiplexed signal (d), and the read outputs (i), (g) from the MMs 11, 12 are thereby generated. ) Is generated every frame F and alternately, and these are given to SEL17 and SEL1
7 is in accordance with the selection signal (k) from the input terminal 18,
Since the output of the read state R of 11 and 12 is selected, the output (l) of this is equal to the read output (i) or (j).

The output (1) of the SEL 17 is distributed in the order of the serial signals (m), (n) and (o) in the demultiplexer (hereinafter referred to as DMX) 19 according to the time slot order of the time division multiplexing. Are transmitted from the output terminals 2-1 to 2-3.

Therefore, the address signals (e) or (g) of the read state R in the MMs 11 and 12 are used to set the address designation to the desired order in response to the exchange request, thereby making it possible to perform the address designation (a) of FIG. ~ (C) and (m) ~
As shown in (o), the data “A”, “I”, and “U” in the time slot of the serial signal (b) on the input side are assigned to the first-order time slots of the serial signals (m) to (o) on the output side. Similarly, the data "I", "II" and "III" in the time slot of the input side serial signal (c) are assigned to the second order time slots of the output side serial signals (m) to (o), Alternatively, the data "D", "E" and "IV" in the fourth time slot of the input side serial signals (a) to (c) are transferred to the same time slots of the output side serial signals (m) to (o). Since the allocation can be made by spatial replacement, the replacement connection in the time axis direction and the space axis direction can be made all at once.

[0013]

As is apparent from the above description, according to the present invention, a plurality of serial signals are time-division multiplexed signals, and the time-division multiplexed signals are sent to the first and second memories for each frame of the serial signals. The data is alternately and serially accumulated, the accumulated contents are read from the first and second memories alternately and in a desired order, and the serial contents are again separated into a plurality of serial signals to be sent out at the same time. The time axis direction and space axis direction of the side serial signal can be interchanged freely, eliminating the need for a separate time switch circuit, and completely exchanging connection of transmission signals with a simple and inexpensive structure. Therefore, a remarkable effect can be obtained as a space switch circuit.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart showing signals of respective parts in FIG.

FIG. 3 is a block diagram of a conventional example.

[Explanation of symbols]

 10 Multiplexer 11, 12 Memory 17 Selector 19 Separator (a) to (c) Serial signal (d) Time division multiplexed signal

Claims (1)

[Claims] 1. A multiplexer that uses a plurality of serial signals as a time division multiplexed signal, and one for each frame of the time division multiplexed signal and alternately, when one is in a write state and the other is in a read state and a write state When the time-division multiplexed signal is serially stored and in the read state, the first and second memories in which the contents are read out in a desired order and the outputs of the two memories in the read state are selected. A space switch circuit comprising a selector and a separator for separating an output of the selector into a plurality of serial signals.