RU2041571C1 - Commutational device - Google Patents

Abstract

FIELD: communication equipment. SUBSTANCE: for reduction of number of internal interlocks, provision of unblocked communication to priority subscribers and access to data base commutational device has n commutation units of first link 1(1)-1(n), n commutation units of second link 2(1)-2(n), additional commutation unit 3 and unit 4 for storage and output of information. EFFECT: expanded application field in organization of automatic communication. 1 dwg

Description

 The invention relates to techniques for automatic switching and can be used to build nodes of automatic switching and quasi-electronic automatic telephone exchanges of small and medium capacity.

Known switching devices containing K ₁ switching blocks in the first link, each of which has m ₁ outputs and n ₁ inputs and K ₂ switching blocks in the second link, each of which contains n ₂ inputs and m ₂ outputs, and the outputs of each switching block the first link are connected to the corresponding inputs of the corresponding switching units of the second link (it is proposed that K ₁ m ₁ K ₂ m ₂ ). (See Livshits B.S. et al. Development of automatic channel switching systems. M. Communication, 1976, pp. 12-14).

 However, such switching devices allow only one connection to be established between one pair of blocks of the first and second link (the remaining calls in this direction are blocked).

 Three-link switching devices are also known, comprising switching blocks in each link connected to switching blocks of a subsequent link with the possibility of access of each switching block of the first link through the second link to switching blocks of the third link. In this case, the switching blocks usually have an equal number of inputs and outputs (nxn), and the connection schemes of the switching blocks of links can be any. (See MT Hills. The principles of switching in telecommunications. M. Radio and communications, 1984, p. 158-160). These switching devices reduce internal blockages, but the volume of equipment increases significantly. In addition, none of these devices allows privileged subscribers, who are also priority ones, to access the data bank to receive information and to provide virtually unblocked communication (these services are necessary for military, government and commercial structures).

 The effect of the invention is compared with a two-link scheme in reducing the number of internal locks, and compared with a three-link scheme in reducing the amount of equipment and providing additional services to privileged subscribers (priority).

 Figure 1 presents a functional electrical diagram of a switching device.

The switching device contains in the first link n switching units 1 ₁ -1 _n , in the second link n switching units 2 ₁ -2 _n , an additional switching unit 3 and an information storage and output unit 4 (data bank).

 The switching device operates as follows.

If necessary, for example, between the switching unit of the first link 1 ₂ and the switching unit of the second link 2 ₁ , the first output of the switching unit 1 _{2 is} connected to the second input of the switching unit 2 ₁ . If it is necessary to simultaneously carry out another connection between these blocks, the nth output of the switching unit 1 _{2 is} connected to the second input of the additional switching unit 3, the first output of which is connected by the nth input of the switching unit 2 ₁ . Privileged subscribers are included in the nth switching blocks of the first and second links. If necessary, they are provided with l connections between the nth blocks directly and additional communication through an additional switching unit 3, which allows communication with unprivileged network subscribers. In addition, n- (l + 1) privileged subscribers can simultaneously access the information storage and delivery unit.

 The switching device thus provides additional types of services and high quality communications.

Claims (1)

 SWITCHING DEVICE containing n switching blocks of the first link and n switching blocks of the second link, while the switching blocks of the first and second links contain n inputs and n outputs, and n 1 outputs of each i-th switch of the first link are connected to the i-inputs of the switching blocks the second link (where i 1, 2, n -1), characterized in that an additional switching unit is introduced, the inputs of which are connected to the n-th outputs of the switching blocks of the first link, and the outputs are connected to the n-th inputs of the switching blocks of the second link, and block storage and issuance of formations of n (l + 1) inputs and outputs of which are connected respectively to the outputs and inputs of the nth switching units of the first and second link, respectively, while l inputs of the nth switching unit of the second link are connected to l outputs of the nth switching unit of the first link , and l <(n 1).