JPH0380736A - Speech path control system - Google Patents

Abstract

PURPOSE:To use a desired exchange system by providing a switching circuit for selecting one of an output of a header extracting circuit or an output of a counter circuit and outputting it to a speech path control memory, and designating one of an ATM exchange system and a line exchange system. CONSTITUTION:In the case a line exchange switch is used as a speech path switch 1, a switching circuit 4 connects a counter 3 and a switching circuit 5. The counter 3 outputs a value which circulates from '0' to some prescribed value and to which '1' each is added at every time of a time slot of input highways 20-2n and output highways 30-3n. In the case an ATM exchange switch is used, the switching circuit 4 connects a header extracting circuit 2 and the switching circuit 5. The header extracting circuit 2 extracts a header of a cell carried on the input highways 20-2n it is inputted as a read-out address to a speech path control memory 6, connection control information is derived by a correspondence table to a logical channel identifier, and the speech path switch 1 executes a desired exchange operation.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a communication path control system for an electronic exchange.

[Conventional technology]

Conventionally, the time division communication path of an exchange has a time switch and a space switch, and is used for line switching. In this case, the communication path control method is to provide a communication path control memory, and specify the time slot (or highway number) of the input highway as the address of this communication path control memory, and the time slot (or highway number) of the output highway as data. (or conversely, by specifying the address on the output highway side and the data using the time slot or highway number on the input highway side), you can exchange time between any time slot on the input highway and any time slot on the output highway, or A spatial exchange was performed between an arbitrary input highway and an arbitrary output highway.

In recent years, ATM has been introduced as a new switching method different from line switching.
(asynchronous transfer mode) exchange is being considered. In this method, communication data is formed into a type of packet called a fixed-length cell, a header area for setting connection destination information is provided in the cell, and data is exchanged according to the header. Unlike line switching, the exchange destination is not determined by the time slot position. In addition, generally, a number to identify the call, that is, a logical channel identifier (hereinafter referred to as VCI) is included in the header, and each switch has a table of correspondence between the VCI and the connection control information of the switch. The connection control information (set by the control device) is used to output the cell to a predetermined output highway.

[Problem to be solved by the invention]

In conventional call route control systems, there is no hardware equipment for call route control that can be shared by ATM exchange and line exchange, and dedicated equipment is provided for each.

Therefore, when an ATM switching system and a line switching system are used together, it is necessary to prepare two types of hardware equipment for call path control, including maintenance parts. Furthermore, in the future, if the system is changed from line switching to ATM switching (or vice versa), new hardware equipment for corresponding call path control must be prepared, which is not economical.

SUMMARY OF THE INVENTION An object of the present invention is to provide a call path control system that can be used commonly by an ATM switching system and a line switching system, and which enables economical equipment costs.

[Means to solve the problem]

The communication path control method of the present invention includes a communication path control memory and controls connection of a communication path switch of an electronic exchange based on connection control information read from the communication path control memory. A header extraction circuit that is connected to the input highway of the computer and extracts and outputs a header from a cell transmitted during ATM exchange, and a header extraction circuit that circulates and adds up to a predetermined value every time slot of the highway and outputs the added value. and a switching circuit that selects either the output of the header extraction circuit or the output of the counter circuit and outputs it to the call path control memory, and when a line exchange switch is used as the call path switch, , when the output of the counter circuit is used as the read address of the connection control information of the communication path control memory and an ATM exchange switch is used as the communication path switch, the output of the header extraction circuit is used as the read address of the connection control information of the communication path control memory. It is characterized by being used as a read address for control information.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a communication path configuration for explaining one embodiment of the present invention.

The communication path control method of this embodiment is based on input highways 20 to 2.
a header extraction circuit 2 that extracts and outputs a header from a cell transmitted to each cell, and input highways 20 to 2n and output highways 30 to 3 according to a clock.
A counter 3 that cycles from "0" to a certain value every n time slots, adds up by 1 degree, and outputs the added value, and inputs the output of the header extraction circuit 2 and the output of the counter 3. a first switching circuit 4 that selects and outputs one of the inputs under the control of a first switching control line 10;
A second switching circuit inputs the output of the first switching circuit 4 and the output of the addressing line 11 of the control circuit 7, and selects and outputs one of the inputs under the control of the second switching control line 13 of the control circuit 7. 5, the connection control information is stored, the output of the second switching circuit 5 is input as an address, the output of the data line 12 of the control circuit 7 is input as data, the connection control information is rewritten and read, and the read connection control information is It includes a communication path control memory 6 that sends data to the communication path switch 1, and a control circuit 7 that controls the above-mentioned parts and controls the connection of the communication path switch 1. The communication path control memory 6 also has a correspondence table between the header internal control channel identifier (VCI) for ATM exchange and the connection control information of the communication path switch 1.

Note that the communication path switch 1 is connected to the input highways 20 to 2n.
and output highways 30 to 3n, and performs exchange operations based on connection control information from communication path control memory 6.

Next, the operation will be explained.

When setting and releasing the connection of the communication path switch 1, the control circuit 7 switches the second switching circuit 5 to the connection between the addressing line 11 and the communication path control memory 6 using the second switching control line 13, This is done by sending an address to the communication path control memory 6 via the address designation line 11 and data via the data line 12, and rewriting the connection control information in the communication path control memory 6. The above communication path control memory 6
In cases other than rewriting, the second switching circuit 5 is switched to connect the first switching circuit 4 and the communication path control memory 6 via the second switching control line 13.

The connection control information stored in the communication path control memory 6 is read out using the information sent from the first switching circuit 4 as an address, and is sent to the communication path switch 1.

Next, a case where a circuit exchange switch is used as the communication path switch 1 will be explained. The first switching circuit 4 connects the counter 3 and the second switching circuit 5 through the first switching control line 10.
n and output highways 30 to 3n, the circuit cycles from "O" to a certain constant value and outputs a value incremented by "1". That value is the communication path control memory 6
is input as a read address, and the communication path switch 1 performs the desired switching operation.

Next, a case where an ATM exchange switch is used as the communication path switch 1 will be described. The first switching circuit 4 connects the header extraction circuit 2 and the second switching circuit 5 via the first switching control line 10 . The header extraction circuit 2 extracts the header of the cell carried on the input highways 20 to 2n, and outputs the value. The value is inputted as a read address to the communication path control memory 6, connection control information is obtained from the correspondence table with the logical channel identifier, and the communication path switch 1 performs the desired switching operation.

〔Effect of the invention〕

As explained above, the communication path control method of the present invention
By specifying either the M switching system or the line switching system, it can be used with the desired switching system.
This has the effect of reducing hardware equipment management work and costs for maintenance and system changes, and enabling economical call route control.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a communication path configuration for explaining one embodiment of the present invention. ■...Call path switch, 2...Header extraction circuit, 3
... Counter, 4... First switching circuit, 5... Second switching circuit, 6... Call path control memory, 7... Control circuit, 10... First switching control Line, 11...Address designation line, 12...Data line, 13...Second switching control line, 20-2n...Input highway, 30-3
n... Output highway.

Claims (1)

[Claims] In a call path control method that includes a call path control memory and controls the connection of a call path switch of an electronic exchange using connection control information read from the call path control memory, when an ATM connected to an input highway of the call path switch is exchanged. a header extraction circuit that extracts and outputs a header from a transmitted cell; a counter circuit that circulates and adds up to a predetermined value every time slot of the highway and outputs the added value; and the header extraction circuit. or a switching circuit that selects either the output of the counter circuit or the output of the counter circuit and outputs it to the call path control memory, and when a line switching switch is used as the call path switch, the output of the counter circuit is When an ATM exchange switch is used as the communication path switch, the output of the header extraction circuit is used as the read address of the connection control information of the communication path control memory. Characteristic call path control method.