JPS5850477B2 - electronic switching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic switching system that facilitates the addition of switching equipment.

Conventionally, there have been several discussions regarding the expansion of all-electronic exchange equipment using a time-sharing system, but these generally have the following drawbacks.

■ Control becomes complicated.

■ It was difficult to make the communication path section of the originally installed electronic exchange and the communication path section of the added electronic exchange the same specifications.

■ If you try to reduce the blockage rate between the originally installed electronic exchange and the added electronic exchange, the additional circuit for expansion will become complicated and large.

In particular, when adding a switch that accommodates a large number of line concentrators, there is a need to avoid an increase in the blockage rate during the addition.

This invention was made in view of the above points, and it avoids an increase in blockage rate when adding electronic exchange equipment, and also allows the communication path section of the original electronic exchange and the communication path section of the added electronic exchange to have almost the same specifications. The present invention provides an electronic exchange device that can perform the following functions.

Embodiments of the present invention are shown in the drawings and explained in detail below.

The entire general switching system for line concentrator groups is shown in FIG. 1 and will be described.

20 is a telephone or a low-speed (voice band) data terminal device or the like.

21 is a line concentrator or high-speed data terminal device.

Reference numeral 1 designates an electronic switching device that connects a telephone or low-speed data terminal device 20 to another telephone or low-speed data terminal device 2.
0 via the line concentrator 21.

Signal transmission between the electronic exchange device 1 and the line concentrator 21 uses a TDM (time division multiplexing) method in which time is divided into frames and the frames are further transmitted through a plurality of time-divided channels.

The basic configuration of the electronic switching device 10 is shown in FIG. 2 and will be described.

In FIG. 2, 2 is a communication path section, 3 is a communication path switch section,
Reference numeral 4 denotes a communication path memory section, which has a control circuit for storing the contents in the communication path memory section 4 and controlling the communication path switch section 3 by reading out the contents thereof.

5 is a common control unit, 6 is a human transmission line, and T is an output transmission line.

8 is a communication path switch section 3 based on the information in the communication path memory section 4.
9 is a group of communication path switch control lines for controlling the communication path switch section 3 and the common control section 5 for various signals including subscriber status information exchanged between the communication switch section 3 and the common control section 5. The signal line group 10 is a signal line group between the communication path memory section 4 and the common control section 5.

The communication path section 2 includes a communication path switch section 3 and a communication path memory section 4.
It is composed of.

A basic configuration diagram of the communication path switch unit 30 is shown in FIG. 3 and will be described.

In FIG. 3, 6 is a human transmission line, and 7 is an outgoing transmission line, through which time-division multiplexed signals are transmitted, and which connects the line concentrator 21 and the electronic exchange equipment 1.

Reference numeral 8 denotes a group of control lines for transmitting control signals from the communication path memory section 4 to the communication path switch section 3.

Reference numeral 9 denotes a group of signal lines for transmitting control signals from the common control section 5 to the call switch section 3.

Reference numeral 10 denotes a group of signal lines, which connect the common control section 5 and the communication path memory section 4.

Reference numeral 11 denotes an additional circuit that switches the communication paths necessary for expanding the electronic exchange device 1, and can be easily added to the communication path switch section 3.

Reference numeral 15 denotes a sending highway buffer memory, which stores one frame of the time-divided signal of the line concentrator 21.

Reference numeral 16 denotes a highway buffer memory, which has a storage function for transmitting the time-division signal of the (1) frame to the line concentrator 21.

17 is a switch subgate, 18 is an AND gate, 19
is an OR gate.

Next, the operation of the electronic switching device 1 shown in FIGS. 1 to 3 when it is not expanded will be explained using the time slot shown in FIG. 6a.

Here, the subscribers connected to the transmission lines 61 and 71 are S
Sub#L is the subscriber connected to ub#K and the subscriber transmission lines 64 and 74, and the time slots assigned to both subscribers are ``70 subscriber transmission line (TSL) output price tie''. Bat feed path (TSL) Sub#K 6,2 716 Sub#L64 4 74 8.

A transmission signal from subscriber Sub#K of telephone 20 is transmitted to line concentrator 21 .

The transmission signal transmitted to the line concentrator 21 is converted into a delta-modulated pulse signal, and the second time slot in the frame)
It is transmitted to the electronic switching equipment 1 via the human transmission line 61 using the β phase of (TSL #2).

Here, the i-th time slot on the crowded transmission lines 6 and 7 is assumed to be TSL#i, and the j-th time slot on the highway switch is assumed to be TSH#j.

Whether TSH is given to subscriber SUB#L varies slightly depending on the load (traffic) on the switching equipment, but the details are not essentially related to this invention, so for the sake of explanation, we will only explain the call with subscriber SUB#L. Assume a situation where only

The signals transmitted to the electronic switching equipment 1 are sequentially stored in the sending highway buffer memory 15 and sent to the AN at TSH#6.
The signal passed through the D gate 184□ and the OR gate 194 is written into the register of the highway buffer memory 164.

After the signal for each frame is configured in the register, it is transferred to the memory and transmitted to the line concentrator 21 via the output transmission line 74.

The signal sent to the line concentrator 21 is demodulated and sent to the subscriber Sub#L of the telephone 20.

Similarly, the transmission signal of the subscriber S ub #L of the telephone set 20 is similarly transmitted to the transmission highway buffer memory 154 using the TSL # 4 via the human transmission line 64 , and is sent to the AND gate 18 of the communication path switch section 3 . □40R gate 19
, the receiver is transferred to the highway buffer memory 16□ TSH
The data is transferred and stored using the well 8.

The transferred and recorded signals are sent to the line concentrator 2 via the output transmission path 71.
1 using TSL#8 and sent to subscriber Sub# of telephone set 20.

Here, control of the communication path switch section 3 is performed by a communication path memory section 4 and a common control section 5 having a control section via a communication path switch control line group 8 and a signal group group 9.

This electron exchange is shown in Figure 6.

4 to 6 with reference to the embodiments of this invention described above.
This will be explained in detail with reference to the drawings.

In FIG. 4, 1 and 1B are two electronic exchanges including an added electronic exchange device, and the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts.

Reference numerals 11A and 11B are expansion call path switch sections for connecting one of the two types of secondary exchanges and the IB to perform the expansion exchange function when adding additional circuits.

Reference numeral 12 denotes a group of signal lines for connecting additional circuits 11A and 11B as an expansion path switch section.

The common control unit 5B exchanges signals with the communication path memory units 4A and 4B via the signal line group 10A and IOB, and also exchanges signals with the communication path switch unit 3 via the signal line group 9A and 9B.
A control signal is transmitted to A and 3B.

The communication path units 2 and 2B include communication unit memory units 4A and 4B having a control unit, additional circuits 11A and 11B having a function of a communication path switch, and communication path switch units 3A and 3.
The communication path memory sections 4A and 4B each have a respective control section and each signal line group 8A,
The additional circuits 11A and 11B and the communication path switch sections 3A and 3B are controlled via the circuit 8B.

Additional circuits 11A and 11 of the electronic switching equipment shown in FIG.
A communication path switch section 3A including B.

A configuration diagram of 3B is shown in FIG. 5 and will be explained.

In FIG. 5, the same reference numerals as in FIG.
The outputs and receivers of 9A and 19B are provided between the inputs of highway buffer memories 16A and 16B, and a signal line group 12 connects both additional circuits 11A and 11B.

Furthermore, the additional circuit 11A includes a communication path memory 4 having a control section.
The communication path is switched by a control signal transmitted from A to the communication path switch control line group 8A3, 8A4 according to the switching state.

Similarly, the additional circuit 11B includes a communication path memo IJ having a control section.
The communication path is switched using a control signal transmitted from 4B via the communication path switch control line groups 8B3 and 8B4 according to the switching state.

Next, the exchange operation when an electronic exchange device is added will be explained using FIGS. 4 and 5 and with reference to FIG. 6.

As shown in FIG. 6C, the communication path switch section 3A.

For the highway time slot in 3B, one time slot is divided into two, one of which is a β phase and the other one is an α phase.

When the basic configuration is not expanded, this is equivalent to replacing only the divided β phase as described above.

In the case of an expansion configuration, as shown in FIG. 6d, in the β phase, the sending highway buffer memory 15A of the electronic exchange 1A → the receiving highway buffer memory IJ16A of the electronic exchange IA.
, sending highway buffer memory 15 of electronic exchange 1B
B → Electronic exchange IB receiver is highway buffer memory 1
6B highway switching is performed (this is the same as two electronic exchanges 'IA and IB operating completely independently).

In the α phase, as shown in FIG. 6e, additional circuits 11A and 11
By switching B, the sending highway buffer memory 15A of the electronic exchange 1A → the receiver of the electronic exchange IB becomes the highway buffer memory 16B, the sending highway buffer memory 15B of the electronic exchange IB → the receiver of the electronic exchange IA becomes the highway buffer memory 16A Highway switching Do this.

Expressing the above from a different angle, exchange operations between subscribers accommodated in the same electronic exchange, that is, between subscribers accommodated in one electronic exchange and between subscribers accommodated in electronic exchange 1B. between subscribers accommodated in different electronic exchanges, that is, electronic exchange 1A.
The additional circuit 1 performs an exchange operation between the subscriber 20 accommodated in the electronic exchange 1B and the subscriber accommodated in the electronic exchange 1B in the
This is done by switching 1A and IIB.

As shown in FIG. 6d, when replacing in the β phase, as shown in FIG. 6e, replacing in the α phase requires changing the connection, and then returning to the original connection in the next β phase.

This connection switching is performed by the additional circuits 11A and 11B, which correspond to the expansion channel switch section, and the signal line group 12 connecting them.

With this configuration, the existing electronic switching equipment and the additional electronic switching equipment can have the same specifications, and expansion can be done by removing or adding a small number of circuits.

In other words, if the highway buffer memory 16 of the same exchange in the β phase (that is, the basic configuration) is replaced with the highway buffer memory 16 of a different exchange in the α phase using the gates 13 and 14 of the additional circuit 11, the By making highway switching multi-phase by inserting logic circuits, group switching can be simply expanded with almost no increase in hardware.

As explained above, the present invention improves the blockage rate when the electronic switching equipment is expanded by configuring an electronic switching equipment in which one time slot used for time division multiplex transmission can be multiphased and exchanged. The existing electronic switching equipment and the additional electronic switching equipment can be made to have almost the same specifications without causing any increase.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the entire switching system for line concentrator group, Fig. 2 is a basic configuration diagram showing the main parts of the electronic exchange equipment, Fig. 3 is a basic circuit configuration diagram showing the communication path switch section shown in Fig. 2, Fourth
The figure shows the constituent parts of the electronic switching equipment when it is expanded, FIG. 5 is a basic circuit configuration diagram showing the call path switch section shown in FIG. 4, and FIG. 6 is a detailed explanation of the operating principle of this invention. It is a diagram. In the figure, 1 is an electronic exchange, 2 is a communication path unit, 3 is a communication path switch unit, 4 is a communication path memory unit having a control unit, 5 is a common control unit, 6 and 7 are transmission lines, and 8 9, 10, 12 are signal line groups, 11 is an additional circuit for switching the communication path, 13, 18 are AND gates, 14.19 are OR gates, 15, 16 are sending and receiving lines. 17 is a highway buffer memory, 17 is a switch subgate, 20 is a telephone or a terminal device, and 21 is a line concentrator including a signal converter for time division multiplex transmission. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a system in which a plurality of electronic exchange units are connected to which a plurality of subscribers are connected and exchange operations between the subscribers are performed in a time-sharing manner, the electronic exchange unit is provided with:
A signal converter that performs time-division transmission between the subscribers using time slots divided into a plurality of time slots in highway switching, and an exchange between subscribers provided in the electronic exchange unit and connected within the electronic exchange unit. An electronic switching device comprising an additional circuit that performs operations and switching operations between subscribers connected to different electronic switching units at different times within the time slot.