KR100214115B1 - A switch having a packet service function - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange for providing a packet service by connecting a packet service apparatus provided for each connection switching subsystem to a local area network of a ring structure, 112, 122, and 132 for each of the connection switching subsystems 100 to 130 that can perform the matching process with the packet service apparatuses 102, 112, 122, (102, 112, 122, 132) configured to form a local area network having a ring structure as a node and to transmit and receive packet data between the connection switching subsystems (100 to 130) When a call connection request is received, a data transmission request signal (RTS) for a packet service is transmitted. When a response signal (CTS) for a data transmission request signal is received, a digital subscriber or digital trunk line At least one or more packet handling controller for site to the call setup and release processing for the received packet data (230 to 232); A packet call control processor (210) for controlling packet call processing; And the packet handling controllers 230 to 232 and the packet handling controllers 230 to 232 in the other connection switching subsystem connected to the packet handling controllers 230 to 232 via the local area network And a first matching unit 220 for performing a matching process for data transmission / reception between the packet call control processors 210 or the packet handling controllers 230 to 232. [

Description

A switch having a packet service function

FIG. 1 is a block diagram of an exchange having a packet service function according to the present invention,

FIG. 2 is a detailed block diagram of the packet service apparatus shown in FIG. 1,

3 is a detailed block diagram of the packet handling controller shown in FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100, 110, 120, 130: connection exchange subsystem (ASS-1 to ASS-4)

101, 111, 121, 131: Basic Subscriber Interface (BAI)

102, 112, 122, 132: Packet service device

103, 113, 123, 133: upper processor (ASP)

210: packet call control processor 220: upper processor and LAN matching unit

230: Packet Handling Controller 301: Link Matching Unit

302: Common memory 303: Packet handling processing unit

304: LAN protocol matching unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange having a packet service function, and more particularly, to an exchange capable of providing a packet service by providing a packet service apparatus in units of an Access Switching Subsystem .

In a conventional exchange, a packet service apparatus for providing a packet service is provided as a separate subsystem, and a link is established in a T (Time Switch) -S (Space Switch) -T (Time Switch) And provides a packet service in a manner of processing packet calls intensively. Thus, in order to set up a packet call, the exchange needs to have a TST switching structure (i.e., a T switch in a subsystem to which a subscriber requesting a packet call is connected, an S switch in an Interconnection Network Subsystem, and a Packet Handling Subsystem Handling Subsystem) is set up first and packet service is performed. Therefore, the control message transmission between the corresponding subsystems for the switch path configuration causes an overload in the system operation or instability on the connected switch path. The quality of the packet service is deteriorated.

In order to solve such a problem, a switching center having a subscriber or a device capable of providing a packet service in an ASS performing a trunk line matching process has recently been proposed.

Accordingly, an object of the present invention is to provide an exchange having a packet service function for connecting a packet service apparatus provided for each connection switching subsystem to a local area network of a ring structure to provide a packet service.

The apparatus according to the present invention comprises a packet service apparatus for each connection switching subsystem capable of performing a matching process with a digital subscriber or a digital trunk line and forms a local communication network having a ring structure using the packet service apparatus as one node And an exchange subsystem configured to transmit and receive packet data, wherein the packet service apparatus transmits a data transmission request signal (RTS) for packet service when a packet call connection request is received, At least one packet handling controller for performing call setup and release processing on packet data received from a digital subscriber or a digital trunk line when a response signal (CTS) is received; A packet call control processor for controlling packet call processing; And a packet handling controller for performing data exchange between the packet handing controller and the packet service apparatus in another connection switching subsystem connected through the local area network or between the packet handling controller and the packet call control processor or the packet handling control period And a first matching portion for matching processing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an exchange having a packet service function according to the present invention. In FIG. 1, a digital subscriber or a digital trunk line (Basic Access Subscriber Interface 101, 111, 121 and 131, hereinafter referred to as BSI) for performing a 2B + D matching process, a packet service apparatus (Access Switching Processors 103, 113, 123, and 133, also referred to as ASPs) for controlling overall call processing in the ASSs 100, 110, 120 and 130 A plurality of ASSs 100, 110, 120, and 130 are connected in a ring structure to a local area network (LAN) 100, 110, 120 and 130, ) Bus.

1 shows a case where four ASSs 100, 110, 120, and 130 are connected in a ring structure with the packet service apparatuses 102, 112, 122, and 132 as nodes, , 110, 120, 130) can be further increased, and the number to be increased is not limited.

The packet service apparatuses 102, 112, 122, and 132 provided in the respective ASSs 100, 110, 120, and 130 are connected to the packet service apparatuses provided in two different ASSs by the ring structure. The other two ASSs correspond to the next ASS and the immediately preceding ASS. For example, the packet service apparatus 102 of the ASS-1 100 is connected to the packet service apparatus 112 of the ASS-2 110 and the packet service apparatus 132 of the ASS- And the LAN bus to be connected is a high-speed serial bus.

The exchange according to the present invention, in which an ASS provided inside the local area network of the ring structure is connected, operates as follows to perform a packet service.

That is, when a packet call connection request packet is transmitted from a digital subscriber (not shown) or a digital trunk line (not shown) that is matched through the BSI 101 of the ASS-1 100 in the ASS provided in the switchboard , And is applied to the packet service apparatus 102.

2, the packet service apparatus 102 includes a packet call control processor 210 for performing packet call control processing and data transmission / reception processing to / from the upper processor 103, A plurality of packet handling controllers 230 for setting and releasing a virtual call for packet service under the control of the packet call control processor 210 described above, an arbitration and LAN matching and packet service device for exchanging packet data, And an upper processor for performing matching processing for communication with the packet call control processor 210, which is an upper processor in the base station 102, and a LAN matching unit 220, and performs a packet service based on the packet call request signal transmitted.

That is, when the packet data transmitted from the digital subscriber (not shown) or the digital trunk line (not shown) is transmitted to the packet service apparatus 102 via the BSI 101 having the aggregation function, the packet service apparatus 102 (Hereinafter, the packet handling controller 230 will be described in detail) among the packet handling controllers 230 to 232 provided therein.

The packet handling controller 230 includes a link matching unit 301 for performing link matching between the BSI 101 and the packet handling controller 230 as shown in FIG. 3, packet data handling such as transmission / A LAN protocol matching unit 304 and a link matching unit 301 for performing matching processing with an upper processor and a LAN matching unit 220 connected via a LAN bus and a packet handling And a common memory 302 commonly used by the processing unit 303 and the LAN protocol matching unit 304 to process the received packet data. Here, the upper processor and the LAN matching unit 220 are configured to be embedded as a twisted pair Ethernet interface circuit for LAN connection.

That is, the link matching unit 301 performs matching processing on the packet data received from the BSI 101 by layer 2 processing, and stores the matched packet data in the common memory 302. At this time, the packet handling processing unit 303 performs a receive interrupt service routine to read and analyze the packet data stored in the common memory 302 through the link matching unit 301, and transmits the packet data to the upper processor and the LAN matching unit 220 in a format And writes it in the corresponding area of the common memory 302, and then increments the count value for the received data. The LAN protocol matching unit 304 periodically searches for the reception amount of the common memory 302 by the polling method and sends a transmission data request signal (Request To Send , Also referred to as RTS).

The upper processor and the LAN matching unit 210 perform an arbitration process on a plurality of packet handling controllers 230 to 232 connected by using a counter (not shown) provided therein, for example, As shown in the figure, when performing intervention processing for 16 packet handling controllers, the upper processor and the LAN matching unit 210 have the 4-bit counter and perform the arbitration processing described above. At this time, the initial value of the counter (not shown) is determined by the unique address value assigned to the packet service apparatus 102. If the transmission data request signal RTS is received from the predetermined packet handling controller 230 during counting for the arbitration process as described above, the count operation is stopped and the packet handling controller 230 issues a permission signal Clear To Send, also referred to as CTS).

Then, the corresponding packet handling controller 230 reads the data converted into the transmission format stored in the common memory (302) through the LAN protocol matching unit 304 and performs LAN protocol matching processing so that the data can be transmitted through the LAN bus And then transmits it to the upper processor and the LAN matching unit 220.

The upper processor and the LAN matching unit 220 first stores the transmitted data and analyzes the stored data to determine whether to transmit the analyzed data to the packet handling controllers 231 and 232 excluding the corresponding packet handling controller 230, (TX) connected to the external LAN bus or the external LAN bus. At this time, there are two transmission terminals to the external LAN bus connected to the packet service apparatus 102, and packet data is output through one transmission terminal. Here, one transmitting terminal is determined according to which direction the packet data is to be transmitted in the ring structure. For example, when the packet data is set to be transmitted in the counterclockwise direction around the packet service apparatus 102 in the ASS-1 100, the packet transmitted from the packet service apparatus 102 in the ASS- Terminal to transmit packet data.

When the packet data is set to be transmitted in the counterclockwise direction as described above, the packet data output from the packet service apparatus 102 is transmitted to the packet service apparatus 112 through the external LAN bus.

The packet service device 112 analyzes the address included in the transmitted packet data and, if the received data is not its own address, transmits the received data to the packet service device 122 in the ASS-3 120 , The packet service apparatus 122 transmits the packet data received by the packet service apparatus 132 provided in the ASS-4 130, if the packet data is not data having its own address, Packet data transmission / reception is performed between service devices.

In addition, the packet handling controllers 231 and 232 provided in the packet service apparatus 102 are always set to the ON state with respect to the reception mode. When packet data is transmitted from the upper processor and the LAN matching unit 220, (231, 232) simultaneously. If the packet data is determined to be data having its own address by analyzing the address of the received packet data, the packet data is processed and ignored if it does not have its own address.

The packet call control processor 210 also analyzes the packet data transmitted from the upper processor and the LAN matching unit 220, and performs processing when the packet data is packet data having its own address.

When the packet data is received, the packet call control processor 210, the packet handling controllers 230 to 232, and the packet service device 112 analyze the address included in the received data, If the data is not the data corresponding to the magnetic address, the received data is ignored.

As described above, according to the present invention, the packet service apparatus provided in each connection switching subsystem is used as a node to form a local area network of a ring structure and perform packet service, There is no need to set the switch path and the switch path setting is not performed. Accordingly, it is possible to prevent the degradation of the packet service quality due to the unstable switch path and to simplify the packet call processing procedure .

Claims (3)

There is provided a packet service apparatus for each connection switching subsystem capable of performing a matching process with a digital subscriber or a digital trunk line, wherein a local communication network having a ring structure with the packet service apparatus as one node is provided, Wherein the packet service apparatus transmits a data transmission request signal (RTS) for the packet service when the packet call connection request is received, and transmits a response to the data transmission request signal At least one packet handling controller for performing call setup and release processing on packet data received from the digital subscriber or digital trunk line when a signal (CTS) is received; A packet call control processor for controlling packet call processing; And an arbitration process for the packet handling controller to control the packet handling controller and the packet handling device in the other access switching subsystem connected through the local area network or between the packet handling controller and the packet call control processor, And a first matching unit for performing matching processing for data transmission / reception in a period of time. The apparatus of claim 1, wherein the packet handling controller comprises: a link matching unit for performing link matching between the basic subscriber interface unit provided in the connection switching subsystem and the packet handling control period; A packet handling processor for performing a packet data handling process including data format conversion to be transmitted and received; A second matching unit for performing a matching process between the first matching unit and the packet handling control period; And a common memory commonly used by the link matching unit, the packet handling processing unit, and the second matching unit for packet services. 2. The apparatus of claim 2, wherein the packet service device is configured to connect between the packet call control processor and the first matching unit and between the matching unit and the packet handling controllers using a local area network (LAN) bus. Exchange with service function.