JPH02218290A - Digital exchange - Google Patents

Abstract

PURPOSE:To realize a function equivalent to that of a time switch and a spatial switch without use of a speech memory by selecting an optional time slot of a highway so as to apply signal exchange between lines. CONSTITUTION:A CODEC section 5 uses a coder 6 to convert an analog voice signal from an outgoing line 4 digitally, the result is outputted to an input and output slot selection section 8, and a digital voice signal from the input and output slot selection section 8 is converted into the analog voice signal by a decoder 7 and outputted to an incoming line 3 of a 2/4-wire conversion section 2. The input and output slot selection section 8 is connected to a control section 9 via a control bus 10 and the input and output slot selection section 8 selects one of plural highways constituting a time division exchange switch circuit network 11 according to the designation of the control section 9, selects one of the plural time slots of the highway and applies input/output of the digital voice signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital switching device related to voice signal exchange in a switching system.

[Prior Art] Conventional digital switching equipment uses a time division switch network for communication paths, and various types of time division switch networks have been put into practical use.

Among them, time switch - space switch - time switch (
The T-3-T type (hereinafter referred to as T-3-T) has become the mainstream digital switching system because it has a low link block rate when used in a large-scale switch network.

The time switch used here uses a call memory that stores voice information, and by controlling the writing order and reading order to this call memory, the time slots are replaced on one highway to perform the exchange operation.

[Problems to be Solved by the Invention] The conventional digital switching device described above uses a call memory for the time switch of the time division switch network, and exchanges the order in which voice information is written and the order in which it is read from the call memory. In order to perform the operations, the control unit and the communication memory that control the operations must perform many processes at high speed, making them complex and effective. Therefore, there is a problem in that it is economically disadvantageous to use this format in small-scale exchanges.

An object of the present invention is to realize an economical digital switching device that is simple in construction and control by performing the functions of a time switch and a space switch without having a speech memory.

[Means and operations for solving the problems] The digital switching device of the present invention includes a two-wire/four-wire conversion means for separating a bidirectional analog voice line into an incoming line and an outgoing line, and a converting means for converting an analog voice signal from the incoming line. a codec means for converting into a digital audio signal and converting the digital audio signal into an analog audio signal and outputting the same to an outgoing line; a time division switching switch network consisting of a plurality of highways having a plurality of time slots; The present invention is characterized by comprising an input/output slot selection means for selecting a slot and inputting/outputting a signal between the time slot and the codec means, and a control means for controlling the input/output slot selection means.

The digital switching device of the present invention selects the digital audio information output from the codec means with the input/output slot selection means for a time division switching switch network consisting of a plurality of highways each having a plurality of time slots. By outputting digital audio information on an arbitrary time slot on an arbitrary highway and inputting digital audio information on an arbitrary time slot on an arbitrary highway selected by the input/output slot selection output means to the codec means, the call memory is This realizes an economical digital switching device that is easy to configure and control without using any other equipment.

[Example] Next, an example of the present invention will be described with reference to the drawings.

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

The 2-wire/4-wire converter 2 separates the bidirectional analog audio signal from the audio line 1 into an incoming line 3 and an outgoing line 4.

The codec unit 5 converts the analog audio signal from the outgoing line 4 into a digital signal by the encoder 6 and outputs it to the input/output slot selection unit 8 , and also converts the digital audio signal from the input/output slot selection unit 8 to the digital audio signal by the decoder 7 . The signal is converted into an analog audio signal and output to the input line 3 of the 2-wire/4-wire converter 20.

The input/output slot selection section 8 is connected to the control section 9 via the control bus 10;
According to the specification, one of the plurality of highways constituting the time division switching switching network 11 is selected, and one of the plurality of time slots of the highway is selected, and the digital audio signal is transmitted. Performs input/output. That is, the input/output slot selection section 8 outputs the digital audio signal from the encoder 6 of the codec section 5 onto the designated time slot of the highway designated by the control section 9, and also outputs the digital audio signal from the encoder 6 of the codec section 5 onto the designated time slot of the highway designated from the control section 9. The codec unit 5 converts the digital audio signal on the specified time slot of the highway into
is output to the decoder 7.

The configuration from the 2-wire 4-wire conversion section 2 to the codec section 5 and the input/output slot selection section 8 is a time division conversion switch circuit network 1.
FIG. 1 shows a voice line 1, another voice line 1'', and associated structures 2' to 8'.

FIG. 2 shows the relationship between highways and time slots in the time division exchange switching network 11 of this embodiment.

There are 32 highways (
O~31), and there are 32 time slots S on each highway by time division, for a total of 32 x 32 (21024 time slots) S
exists. In FIG. 2, in order to show this situation, a four-digit number is assigned to each time slot S, with the first two digits indicating the highway number and the bottom two digits indicating the time slot position within the highway.

Next, the exchange method in this embodiment will be explained. For example, when connecting an incoming line and eight lines, the control unit searches for two unused time slots in the time division switch network. Assuming that these are slot A and slot B, slot A and slot B are set as the output slot and input slot, respectively, for the input/output slot selection section of the A line. Furthermore, slot B and slot A are set as output slots and input slots, respectively, for the input/output slot selection section for eight lines. As a result, the output of the incoming line becomes the input of the 8 lines, and the output of the 8 line becomes the input of the incoming line, allowing mutual communication between the incoming line and the 8 lines. Since there are a total of 1024 time slots, 512 calls can be made on 1024 lines at the same time.Furthermore, since lines that are not in a call state do not occupy time slots, the present invention can be applied to the digital switching section of an exchange with a capacity of several thousand lines. This can be achieved by

[Effects of the Invention] As explained above, the present invention selects an arbitrary time slot on the highway and exchanges signals between lines, so that functions equivalent to a time switch and a space switch can be achieved without using a communication memory. This has the effect of realizing an economical digital switching device with simple configuration and control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a conceptual diagram of a time division switch network in one embodiment of the present invention. 2, 2' 3, 3'4.4' 5, 5' 6, 6' 7, 7' 2-wire 4-wire conversion section, incoming line, outgoing line, codec section, encoder, decoder, 8, 8' 9・ ・ ・ 10 ・ ・ 11 ・ ・ ・I/O slot/control unit, ・Control path, ・Time division switching switch selection unit, Tsuchi circuit network.

Claims (1)

[Claims] A 2-wire/4-wire conversion means that separates an analog audio line, which is a bidirectional line, into an incoming line and an outgoing line, converts an analog audio signal from the incoming line into a digital audio signal, and converts the digital audio signal into an analog audio signal and converts it to the outgoing line. codec means for outputting; a time division switching switch network comprising a plurality of highways having a plurality of time slots; A digital switching device comprising: input/output slot selection means for outputting; and control means for controlling the input/output slot selection means.