KR950006569B1 - Packet switching system of electronic switching - Google Patents

Abstract

The device improves the efficiency of packet processing and usefulness of system connection and expansion, and has the advantage of maintenance by division between data bus and control bus. The device includes a packet bus unit(10) which has the link function to a switch unit(5), a packet processing unit(11) which executes the exchange of packet data, a packet call control unit(9) which executes the CCITT X.3, X.28, X.29 protocol processing function, a packet assembly/division unit(12) which executes the assembly and division of packet data, a packet exchange unit(6), a controller(8) and a cross network(7) between processors.

Description

Packet Switching Device of Electronic Switch

1 is a block diagram of an ISDN switch having a packet switching function.

2 is a block diagram of a packet switching apparatus according to the present invention.

3 is a configuration diagram of a packet call control device.

4 is a configuration diagram of a packet bus device.

5 is a configuration diagram of a packet processing apparatus.

6 is a block diagram of a packet assembly / disassembly apparatus.

* Explanation of symbols for main parts of the drawings

9: packet call controller 10: packet bus device

11: packet processing apparatus 12: packet assembly / disassembly apparatus

The present invention relates to a packet switching apparatus for performing a packet service in an electronic exchange.

By distributing the protocols required for packet exchange to multiple devices, it is possible to improve the packet processing efficiency and to easily change and expand the system, and to increase the reliability by using the redundancy and load balancing forms, and to separate the data bus and the control bus. An object of the present invention is to construct a packet-switching device having a structure that facilitates maintenance.

Packet switching is one way to build a network that can adequately handle data congested in interactive computer traffic, where packets mean 'parcels'. In other words, when performing data communication, data is divided into predetermined lengths, and the receiving side address and control information are added to each unit to form one small parcel unit. That's the way.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a block diagram of an Integrated Services Digital Network (ISDN) switch having a packet switching function, and a digital subscriber matching device 1 having a 2B + D matching function, and a primary group subscriber matching device having a 23B / 30B + D matching function (2). ), Basic access multiplexing device (3), digital subscriber matching device (1), primary group subscriber matching device (2), and basic access multiplexing matching with multiple 8/12 × (2B + D) matching functions. A frame multiplexing / demultiplexing apparatus 4 having a frame multiplexing / demultiplexing function for the D channel packet data from the apparatus 3, a packet switching apparatus 6 having a switching function of the B / D channel packet data 6, B / Switch device 5 which provides a path for sending D-channel packet data to packet switching device 6, Control device 8 which performs the operation control function of each device constituting switch, Processor of each device Processor-to-processor interconnects that provide seamless communication between Etc.)

The ISDN exchanger must provide packet service for the ISDN subscriber, interworking with the ISDN, interworking with the public packet switched data network, and the like. In the packet switching apparatus 6, a fixed-up path of the switch apparatus 5 is provided. After processing Layer 2 function of each protocol for packet data that has been processed), it is arranged in packet form, and data transfer function among Layer 3 functions is processed, and packet service is provided to subscribers of character data terminal (C-DTE) of public telephone network. Assembly / disassembly is performed to provide

That is, the 2B + D signal and data information received from the ISDN subscriber through the digital subscriber matching device 1 are separated into B and D channels, and the B channel is transmitted to the packet switching device 6 through the switch device 5. For the D channel information, the packet data obtained by processing the layer 2 protocol is transmitted to the packet switching device 6 through the frame multiplexing / demultiplexing device 4 and the switch device 5.

The primary group subscriber matching device 2 performs a function of separating the D channel from the 23B black or 30B + D signal and data information received by the primary group matching, and the separated D channel information is separated into signal and packet information again. Among them, the packet data is transmitted to the packet switching device 6 through the frame multiplexing / demultiplexing device 4 and the switch device 5.

The basic access multiplexing device 3 processes data multiplexed with the basic access 2B + D, which separates the multiplexed channel and the D channel from the received 8/12 × (2B + D) signal and data information. The D channel information is separated into signal and packet information, and the double packet data is transmitted to the packet switching device 6 through the frame multiplexing / demultiplexing device 4 and the switch device 5.

Accordingly, the layer 1 and layer 2 functions of the D channel input from the ISDN digital subscriber are performed by the digital subscriber matching device 1, where the B channel D channel packet is transmitted to the centrally configured packet switching device 6 in the case of the packet call. Send the data. The packet exchange apparatus 6 analyzes the packet call, requests the number translation, and transmits the packet data to the called party's electronic exchange to establish a packet call connection.

As such, the functions required for packet call processing in the ISDN exchange include Layer 3 functions related to packet call processing, Layer 2 functions for B channel packets, Layer 2 functions for D channel packets, and CCITT X.75 for interworking between ISDN. Layer 2 function for CCITT X.75 for interworking between Public Packet Switched Data Network and Analytical Send function, High-speed channel providing function for interworking between Packet Switching System (6) and Packet Assembly / Disassembly For example, the packet switching apparatus 6 should perform layer 2 and layer 3 functions such as CCITT X.25, X.75, and ISDN internal protocols, and also have a function of assembling / disassembling packets.

2 is a block diagram of a packet switching device 6 according to the present invention, and includes a packet processing device 11 for processing a data transfer function among layer 2 functions and layer 3 functions for each packet-related protocol, and for a public telephone network subscriber. A packet call controller that performs packet call processing procedures and maintenance functions in a packet assembly / decomposer 12 that performs CCITT X.3, X.28, and X.29 protocol processing functions, and a packet switching device 6 9) to the packet bus apparatus 10 which performs a function of providing a communication path between the packet call control apparatus 9 and the packet processing apparatus 11 and the packet assembling / decomposing apparatus 12 in the packet switching apparatus 6; Is done.

Here, the packet call controller 9 receives the path information related to the packet call from the controller 8 through the interprocessor interconnection network 7, and links the packet call controller 10 to the packet processor 11 via the packet bus apparatus 10. Provides the setting and release information of the packet information, requests the collection of charging information related to the packet call from the packet processing apparatus 11, collects the result, and configures the result in a desired form. Send to). The packet processing apparatus 11 accommodates a link connected to the switch apparatus 5, receives the control information from the packet call control apparatus 9 through the packet bus apparatus 10, and transmits packet data between the calling party and the called party. Replace it. The packet assembly / decomposition device 12 accommodates a link connected to the switch device 5, and receives control information from the packet call control device 9 via the packet bus device 10 and is input from the public telephone network subscribers. It performs assembly and decomposition of packet data for the data. The packet bus device 10 performs an arbitration function for smooth communication without data collision between the devices in the packet switching device 6.

3 is a block diagram of the packet call control device 9 according to the present invention, wherein the packet call control device 9 performs various packet call control functions in the packet switching device, that is, the packet processing device 11 performs a DTE. Alternatively, after receiving the call request packet from the network and requesting the route data for the virtual call setup through the packet bus device 10, the packet call control and route information processing function for providing the route information, subscriber link management, billing, Performs operation and maintenance functions such as statistics data collection management. The packet call control device 9 performs message communication with the control device 8 via the interconnection network 7 between processors, and the packet call control with a plurality of packet processing devices 11 through the packet bus device 10. A packet call control processor 13a having a redundant operation / waiting structure for efficiently performing such call control functions and easily coping with hardware and software in future capacity expansion and function expansion. A plurality of ˜l 3n) are configured in a load sharing form.

The packet call control processors 13a to l3n exchange call control messages with the inter-processor interconnection network 7 matching function for exchanging communication messages with the control device 8, the packet processing device 11, and the packet assembly / disassembly device. Additional hardware is configured for the packet bus device 10 matching function, the operation operation function in the operation / standby mode, and the like. The packet call control processor 13a to l3n, the packet processing device 11, and the packet assembly / The exchange of messages between the decomposition devices 12 takes place at high speed under the intervention of the packet bus device 10 in the form of a local area network (LAN) frame. For this purpose, the packet call control processors 13a to 13n use two types of buses. One is the data bus (15a-l5n) consisting of the arbitration signal and the transmission and reception data signal, the other is the transmission and reception for asynchronous transmission of control messages related to the operation of the data bus (15a-l5n)Inde line control bus 14 consisting of, these bus cheun are all connected mutually and packet bus device 10. In particular, for efficient operation of the maintenance and management functions, the control bus 14 is a packet only in one of the specific packet call control processors 13a among the plurality of packet call control processors 13a to 13n in the packet call control device 9. It is connected to the bus device (10).

In particular, the number of configurations of the packet call control processors 13a to 13n in the packet call control device 9 is changed and adjusted according to the packet processing traffic characteristics and the packet processing capacity required at the exchange, and the control bus 14 is adjusted as necessary. It can be variably connected in any packet call control processor 13a-13n.

4 is a block diagram of a packet bus apparatus 10 according to the present invention, wherein the packet bus apparatus 10 includes a packet call control apparatus 9, a packet processing apparatus 11, and a packet assembly / It performs the function of interconnecting the disassembly devices 12, and the packet bus device 10 performs a two-step arbitration function for the collision-free message exchange between these devices, the first step is two kinds of arbitrators And packet processing and packet processing processor arbiters 16a and 16b which perform arbitration functions so that a plurality of packet call control processors 13a to 13n in the packet call control apparatus 9 can transmit packets in sequence. Apparatus 11 and Packet Assembly / Disassembly Apparatus 12 A packet processor arbiter 18a which performs arbitration so that a plurality of packet processors 19a to l9k-1, 20k to 20n, 21 can transmit packets in sequence. 18b), the second step is packet call processor processor arbiter (16a, 16b) and packet processing. It is performed in the central arbitrators 17a and 17b which perform the overall mediation function using the information from the preceding mediators 18a and 18b. According to the bus operation method as described above, the packet bus device 10 is composed of three types of packet call control processor arbiters 16a and 16b, packet processor arbiters 18a and 18b, and central arbitrators 17a and 17b. The actual data bus arbitration process takes place in the central arbiters 17a and 17b.

Each of these arbiters 16a and 16b, 17a and 17b, and 18a and 18b is composed of two redundancies for improved reliability. Accordingly, a plurality of duplicated packet call control processors 13a through the packet call destination device 9 are provided. 13n) The data buses 15a to 15n respectively connected to each other are connected to both the redundant packet call control processor arbiter (A) 16a and the packet call control processor arbiter (B) 16b and the like. The processing apparatus 11 and the packet assembly / decomposing apparatus 12 are connected to both the redundant packet processor arbiter (A) 18a and the packet processor arbiter (B) 18b. In addition, the control bus 14 in the specific packet call control processor 13a in the packet call control device 9 is connected to the central mediators 18a and 18b for quick and easy processing of maintenance. Like 15a ~ l5n), it is connected to both central arbiter (A) 17a and central arbiter (B) 17b. In particular, the control bus 14 connected between the central arbiters 17a and 17b of the packet bus device 10 and the specific packet call control processor 13a in the packet call control device 9 is used to determine which packet call control processor 13a to which. 13n).

In this way, the packet call control processor 13a to 13n in the packet call control device 9, the packet processors 19a to 99n in the packet processing device 11, and the packet assembly / decomposition controller in the packet assembly / decomposition device 12 ( 21 and the like are point-to-point star networks for the packet call control processor arbiters 16a and 16b and the packet processor arbiters 18a and 18b in the packet bus device 10, respectively. The packet call control device 9, the packet processing device 11, the packet assembling / decomposing device 12, and the like are connected to the point-to-point, point-to-multipoint, and the like through the packet bus device 10. Communication is possible by a broadcast (broad-casting) method.

5 is a configuration diagram of a packet processing apparatus 11 according to the present invention. In the packet switching apparatus 6, an X.25 link level function, a packet level function, an internal protocol processing function, and the like are performed. .25 processes LAPB protocols, connection protocols with frame multiplexing / demultiplexing apparatuses 4, and packet level functions under the control of packet call control apparatus 9 to establish and release virtual calls, and forward data packets; The internal protocol processing function is an end-to-end packet as an end-to-end protocol between originating and receiving nodes performed to reduce transmission delay between the packet processors 19a to 19k-1 and 20k to 20n in the packet processing apparatus 11. Performs functions such as flow control, packet transmission order control, and packet retransmission. As a result, the packet processing apparatus 11 connects the link with the switch apparatus 5, and according to the packet switching service characteristics, the B channel, the D channel, the public packet switched data network, the internal protocol, etc., for each packet data type. A packet processor (19a to 19k-1) and a public packet exchange data for processing a packet for an internal protocol (IP), which is a packet protocol for interworking between a B / D channel packet and a co-exchange electronic exchange. It is composed of two types of packet processor -P (20k to 20n) that processes the analog data packet when the analog transmission method is used when interworking with the network, and for each packet data type in the packet processors 19a to 19k-1. The function of is done by implementing different software only.

These packet processors 19a to l9k-1 and packet processor -P (20k to 20n) are connected point-to-point to the switch device 5 and the packet processor arbiters 18a and 18b in the packet bus device 10. The number of these components is changed and adjusted according to the packet processing traffic characteristics and the packet processing capacity required at the exchange. In particular, the packet processor 19a to 19k-1 and the packet processor -P (20k to 20n) are each a packet processor arbiter (A) 18a and a packet processor arbiter in the redundant packet bus device 10 for improved reliability. (B) 18b are each connected by separate buses.

6 is a block diagram of a packet assembly / decomposition apparatus 12 according to the present invention, in which the packet assembly / decomposition apparatus 12 provides a packet service for C-DTE connected to a public telephone network. It performs X.28 and X.29 functions, and for these functions, data generated from C-DTE subscribers of the public telephone network is multiplexed at the standard speed through the switch device 5, and the input data is converted to the original speed. Speed conversion / multiplexing controllers 22a to 22n that perform the function of converting and multiplexing, to assemble the data converted at the original speed into packet data, and to transmit the received packet data at the same speed as the C-DTE subscriber. It consists of a packet assembly / decomposition controller 21 that performs a packet decomposition function.

A plurality of speed conversion / multiplexing controllers 22a to 22n are connected to the packet assembly / decomposition controller 21 on separate buses, and the number of configurations thereof depends on the packet processing traffic characteristics and the packet processing capacity required by the exchange. Change is adjusted. In particular, the packet assembling / disassembly controller 21 is a separate bus to the packet processor arbiter (A) 18a and the packet processor arbiter (B) 18b in the redundant packet bus device 10 to improve reliability. Connected.

In this way, the protocol required for packet exchange is divided and processed by each component in the packet switching apparatus 6, and each apparatus is appropriately configured in a combination of redundancy and load balancing to increase the efficiency of packet processing as well as the system. It can be easily connected and expanded, reliability can be improved, and maintenance and management can be performed more easily by using a data bus and a control bus separately.

Claims (7)

A packet switching device of an ISDN exchanger having a packet switching function, which handles a data transfer function among layer 2 and layer 3 functions for each protocol related to a packet, and accommodates a link connected to a switch device (5). A packet processing device 11 for receiving control information from the packet call control device 9 through the bus device 10 and exchanging packet data between the calling party and the called party, and CCITT X for a public telephone network subscriber. A function to perform .3, X.28, X.29 protocol processing functions, which accepts a link connected to the switch device 5 and receives control information from the packet call control device 9 through the packet bus device 10. Packet call processing procedures in the packet assembling / decomposing device 12 and packet switching device 6 for assembling and decomposing packet data for data inputted from public telephone network subscribers. Function to maintain packets, and to establish a link to the packet processing device 11 through the packet bus device 10 by receiving path information related to the packet call from the control device 8 through the interprocessor interconnection network 7. And providing the release information, requesting the collection of the charging information related to the packet call from the packet processing apparatus 11, collecting the result, and configuring the result in a desired form, and then sending the information to the control apparatus 8 through the inter-processor interconnection network 7. The packet call control device 9 and the packet call control device 9 in the packet switching device 6 as an arbitration function for smooth communication without data collision between the devices in the packet call control device 9 and the packet switching device 6 performing the sending function. And a packet bus device (10) which performs a function of providing a communication path between the processing device (11) and the packet assembling / decomposing device (12). 2. The packet call control device (9) according to claim 1, wherein the packet call control device (9) performs message communication with the control device (8) via an interprocessor interconnection network (7), and several packet processing devices via the packet bus device (10). (11) and the packet assembling / decomposing devices (12) efficiently perform packet call control functions such as exchanging internal messages for packet call control, and can easily cope with hardware and software in future capacity expansion and function expansion. To this end, a plurality of packet call control processors 13a to 13n having a redundant structure of operation / standby are configured in a load sharing form, and the packet call control processors 13a to 13n are connected to the control device 8. Interconnection network (7) matching function between the processors for exchanging communication messages, packet processing device (11), and packet bus device (10) matching function for exchanging call control messages with packet assembling / disassembly device, in operation / standby mode. Movement luck Electronic exchange packet switching device, characterized in that includes means for function. The message exchange between the packet call control processor (13a-13n), the packet processing device 11 and the packet assembly / decomposition device (12) is in the form of a local area network (LAN) frame. The packet call control processor 13a to l3n receives data arbitration by the packet bus device 10 and the data bus 15a to l5n and the data bus 15a to 15n which are composed of an arbitration signal and a transmission / reception data signal. It consists of a control bus 14 consisting of a transmission and reception signal line for transmitting a control message related to the operation of the a) in an asynchronous manner, all of these buses are interconnected with the packet bus device 10, the efficient operation of maintenance and management functions For this purpose, the control bus 14 is connected to the packet bus device 10 only in one packet call control processor 13a of the plurality of packet call control processors 13a to 13n in the packet call control device 9, The packet call control field The number of configurations of the packet call control processors 13a to 13n in (9) is changed and adjusted according to the packet processing traffic characteristics and the packet processing capacity required at the exchange, and the control bus 14 can vary any packet call as necessary. A packet-switching device for an electronic exchange comprising a means that can be connected to only the control processors (13a to 13n). 2. The packet bus apparatus (10) according to claim 1, wherein the packet bus apparatus (10) is interconnected between the packet call control apparatus (9), the packet processing apparatus (11), and the packet assembly / decomposition apparatus (12) in the packet switching apparatus (6). The packet bus device 10 performs a two-stage arbitration function, in which a first stage is performed in two kinds of arbitrators, and these packet calls A packet call control processor intermediate apparatus 16a, 16b which performs a conventional function so that a plurality of packet call control processors 13a-l3n in the control apparatus 9 can sequentially transmit packets, the packet processing apparatus 11, and A packet processor arbiter 18a, 18b which performs an arbitration function so that a plurality of packet processors 19a-l9k-1, 20k-20n, 21 in the packet assembly / decomposition device 12 can sequentially transmit packets. Step 2 is the packet call control processor arbiter 16a, 16b and the packet. It is performed in the central arbiters 17a and 17b which perform the overall arbitration function using the information from the processor arbiters 18a and 18b, and according to the bus operation method, the packet bus device 10 is a packet call control processor. It consists of three types of arbiters 16a and 16b, packet processor arbiters 18a and 18b, and central arbitrators 17a and 17b. The actual data bus arbitration process is performed by the central arbiters 17a and 17b. Packet switching device of an electronic exchange, characterized in that. 5. The apparatus of claim 4, wherein each of the arbiters 16a and 16b, 17a and 17b, l8a and 18b of the packet bus device 10 is configured by two redundancy for improving reliability. The data buses 15a to 15n connected to each of the plurality of redundant packet call control processors 13a to 13n in the packet bus control processor arbiter (A) 16a and the packet call control processor arbiter are duplicated. (B) (16b) and the like, and the packet processing apparatus 11 and the packet assembly / decomposing apparatus 12 are connected to the duplicated packet processor arbiter (A) 18a and the packet processor arbiter ( B) 18b, etc., both of which are connected to each other, and the control bus 14 in the specific packet call control processor 13a in the packet call control device 9 provides a central mediator 18a, for quick processing of maintenance. 18b), similar to the data buses 15a-15n, the central arbitrators (A) 17a and the central mediators (B) (18b). Packet switching device of an electronic exchange, characterized in that all connections to. 2. The packet processing apparatus (11) according to claim 1, wherein the packet processing apparatus (11) is connected to a link with the switch apparatus (5), and for the B channel, the D channel, and the public packet switched data network for each packet data type according to packet switching service characteristics. And link control functions such as for internal protocols, and when the B / D channel packet and the internal protocol (IP) are interworked with a packet processor (19a to l9k-1) that processes the packet and the public packet switched data network. It is composed of two types of packet processor -P (20k to 20n) for processing the analog data packet when using the transmission method. The function of each packet data in the packet processors 19a to l9k-1 is performed only by software. The packet processor 19 to 19k-1 and the packet processor -P 20 to 20n may be implemented by different implementations, and the packet processor arbiter 18a in the switch device 5 and the packet bus device 10 may be modified. 18b) is connected to the point-to-point point, the composition of which The number is changed and adjusted according to the packet processing traffic characteristics and the packet processing capacity required at the exchange, and each of the packet processors 19a to 19k-1 and the packet processor -P (20k to 20n) is duplicated to improve reliability. A packet exchange device in an electronic exchange, characterized in that it is connected to a packet processor arbitrator (A) (18a) and a packet processor arbiter (B) (18b) in a bus device (10), respectively. The system of claim 1, wherein the jacket assembling / disassembling device (12) performs CCITT X.3, X.28 and X.29 functions by providing a packet service for a C-DTE connected to a public telephone network. Speed conversion / multiplexing controllers 22a-22n for multiplexing the data generated from the C-DTE subscribers at the standard speed through the switch device 5 to convert and popularize the data at the original speed. ), A packet assembly / decomposition controller 21 for assembling the data converted at the original speed into packet data and performing packet data decomposition to transmit the received packet data at the same speed as the C-DTE subscriber. The packet assembling / disassembling controller 21 is connected to a plurality of speed conversion / multiplexing controllers 22a to 22n, respectively, on separate buses, and the number of configurations thereof is required by the packet processing traffic characteristics and the exchange. The packet assembly / disassembly controller 21 changes and adjusts according to the packet processing capacity, and the packet processor arbiter (A) 18a and the packet processor arbiter 8 in the redundant packet bus device 10 for improved reliability. An apparatus for switching packets of an electronic exchange, characterized in that each is connected to a separate bus (18b).