KR960002676B1 - Switching control of network termination in the isdn - Google Patents

Abstract

The switching control device of an ISDN heavy capacity network termination comprises an ANDing unit for ANDing an inverted clock signal of RCLK and a mask signal output from a signal relaying unit; and a shift register for inputting the output of the ANDing unit via an inverter and outputting a signal to a signal relaying unit of each shelf according to an enable signal output from the switching controller.

Description

Switching control device for the medium-capacity network terminator

1 is a schematic diagram of a subscriber network connection in a general information communication network to which the present invention is applied.

2 is a schematic diagram of an integrated telecommunication network NT12 system to which the present invention is applied.

3 is a functional diagram of a switching control unit of the NT12 according to the present invention.

4 is a configuration diagram of a switch matrix of a switching control unit according to the present invention.

5 is an interface diagram for HDLC communication with a signal relay according to the present invention.

6 is a control block diagram of a network synchronizer clock according to the present invention.

* Explanation of symbols for main parts of the drawings

28: switching unit 29: D channel interface unit

30 control unit 31 DPRAM interface unit

32: serial interface unit 33: clock synchronization generating circuit

38: shift register 39,41: inverter

40: ANDGATE 42: line driver

43: clock generator 44: multiplexer

The present invention relates to a switch control device of a comprehensive information communication network (hereinafter referred to as ISDN) medium-capacity network termination device 12 (hereinafter referred to as NT12).

Field of the Invention The present invention is a result of previous studies in a general information communication network that has not been commercialized, and the related arts are mostly related to switching of a private exchange centered on analog and digital subscribers. Switching between the subscriber and the network may be implemented, but the switching function in NT12, which performs only the function of ISDN, is still in its infancy. In Korea, there is an ISDN subscriber module in a local exchange developed by the Korea Electronics and Telecommunications Research Institute as a conventional technology, but it only has the network-related functions of the local exchange centered on the U interface.

An object of the present invention is the subscriber terminal component TA (Terminal Adaptor), one-layer functional network termination device (hereinafter referred to as NT1), 1-3 layer functional network termination device (hereinafter referred to as NT2) In addition, the BB (Basic Rate Interface) of 2B + D, which is the basic speed between the subscriber and the network, is transmitted to the subscriber through the switching operation or to the information exchange to the local exchange, and is recommended in CCITT Recommendation I.431. It is to provide a switch control device of ISDN medium capacity NT12 that performs the information transfer function of the PRI (Primary Rate Interface).

In order to achieve the above object, the present invention, the ISDN network subscriber side interface can be connected to the ISDN telephone or terminal termination device, etc. One interface unit can accommodate 8 subscribers, the subscriber side data and basic access information (2B + D S interface unit for allocating B and D channels to a specific channel of a system bus, and is connected to the primary group access interface unit and receives B and D channels from the S interface unit to the system bus. The B channel is connected to the S interface unit, and the D channel transmits the signal relay unit through the HDLC bus and analyzes the information (2B + D) transmitted from the signal relay unit to perform a call control protocol. When coarse information requires switching, it performs a switching function and sends a clock synchronized with the network by receiving a network synchronizer clock to the signal relay unit. And a switching control unit for exchanging maintenance information such as subscriber's call status, billing information, and system status information through DPRAM, and maintenance information such as subscriber's call status, charging information, and system status information through DPRAM. A main control unit for transmitting the received maintenance information to a personal computer, which is an attendant console, and a primary group speed access interface unit connected to the S interface unit by a system bus and connected to a local exchange to provide a synchronizer clock to the switching controller. In the integrated information communication network medium capacity network termination device; AND means for performing logical multiplication operation using the inverted clock signal of the signal relay unit and the HDLC clock RCLK of the switching control unit as one input and a mask signal as a type force from the signal relay unit, and an output signal of the AND unit. And a shift register configured to receive the output of the inverter and output the signal to the signal relay of each shelf according to the enable signal from the switching controller.

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

1 is an ISDN subscriber-to-network connection diagram in an ISDN network to which the present invention is applied, and a network termination device (hereinafter referred to as NTE) connected to an ISDN local exchange through a U interface BRI (Basic Rate Interface), and the NTE. A standard terminal device (TE1) connected to the S interface to the TA, a TA connected to the N interface from the NTE and TE1, a non-standard terminal device (TE2) to connect the R interface to the TA, and a PRI (Primary Rate Interface) to the ISDN local exchange. NT1 (ISDN Private Automatic Bracnch Exchange) to connect NT1 to the T1 interface, and NT12 to connect the ISDN local exchange via BRI and PRI.

2 is an ISDN NT12 system configuration according to the present invention, in which, 21 is a primary speed access interface unit, 22 to 22N is an S interface unit, 23 is a signal relay unit, 24 is a switching control unit, 25 is a main control unit, 26 represents a personal computer, respectively.

As shown in the figure, the ISDN NT12 can connect an ISDN telephone or terminal end device to the ISDN network subscriber side interface, and one interface unit can accommodate 8 subscribers, and the subscriber side data and basic access information (2B + D) processes an S interface unit 22 to 22N for allocating B and D channels to a specific channel of a system bus, and is connected to the primary group access interface unit 21, and from the S interface unit 22 to 22N. The signal relay unit 23, which receives the B and D channels and allocates the B and D channels to the bus, binds the S interface units 22 to 22N, and transmits the D channel through the HDLC bus. It analyzes the information (2B + D) transmitted from the relay unit 23 and performs the call control protocol. When the call control information requires switching, it performs the switching function and receives the network synchronizer clock. The switching control unit 24 and the switching control unit 24, which are supplied from the switching control unit 24, supply the set clock to the signal relay unit 23 and exchange maintenance information such as call state, billing information, and system state information of the subscriber through the DPRAM. Main control unit 25 for transmitting maintenance information, such as call status, billing information, and system status information, to the personal computer 26, which is an attendant console, and the S interface unit 22 to 22N. It is composed of a primary group speed access interface 21 which is connected to the system bus and provides a synchronizer clock to the switching controller 24 at the local exchange side.

Detailed description of the configuration is as follows.

The D channel processing function delivers the HD channel type D channel information transmitted through the signal relay 23 to the call control software in the switching controller 24 for processing.

The switching function is described by switching the internal switching of the B channel through the signal relay 23 and the primary group speed access information transmitted through the signal relay 23, and the B channel as an RPI. It is a function to let.

FIG. 3 is a functional diagram of the switching controller, in which 28 is a switching unit, 29 is a D channel interface unit, 30 is a control unit, 31 is a DPRAM interface unit, 32 is a serial interface unit, and 33 is a clock synchronization generating circuit. .

As shown in the figure, the switching controller is a 16-bit microprocessor which provides three serial communication channels for serial communication and provides four chip select signals to simplify the circuit on the board (the controller 30). ) The internal serial communication channel has a total of eight communication buffers, which can be controlled by a queue structure.) A function of exchanging subscriber's D channel information with the signal relay 23 of FIG. The D-channel interface unit 29 performs an HDLC interface, and maintains the D-channel interface unit 29 for constructing and transmitting a message for call control, and the DPRAM mounted in the main control unit 25 of FIG. It exchanges maintenance information and divides the whole memory into transmitter and receiver to communicate. Each part is divided into 8 blocks and used as communication buffer. The first block of minutes is a DPRAM interface unit 31, which is used as a pointer for designating a location of information on which communication is currently performed, and RS- for monitoring the system using one of the serial communication channels in the controller 30. It is an interface for system monitoring by asynchronous communication method through 232C. Since data transmission direction is unidirectional and data volume is not large, only one communication buffer is used and communication speed is 9600bps. In order to achieve clock synchronization with the serial interface unit 32 and the network, 8KHz received from the primary group speed access interface unit 26 of FIG. The clock synchronization generating circuit 33 supplied to the system and the system bus type coming from the signal relay 23 of FIG. Receiving the serial stream is configured to convert it back to a parallel to the switching unit 28 to transmit to the second-degree signal relaying portion (23).

4 is a configuration diagram of a switch matrix for B channel switching according to the present invention, in which FIG. 34 shows a series / parallel converter, 35 and 37 switch, and 36 shows a parallel / serial converter.

As shown in the figure, the switch matrix is a serial / parallel converter 34 for converting 32 serial B-channel information from the signal relay unit 23 of FIG. 2 into eight parallel signals and outputting the same. The first switch 35 and eight parallel output signals from the first switch 35 are input to the internal memory according to a specific time slot as a switch in which data input through the / parallel converter 34 is actually stored. A parallel / serial converter 36 which converts the parallel B channels into 32 serial forms again and transmits them to the signal relay 23 of FIG. 2, and a CPU controller for switching data stored in the first switch 35. And a second switch 37 for controlling the first switch 35 under control of (not shown), and the B channel information of a subscriber controls the second switch 37 to control the first switch (not shown). To switch the data stored in Specifying a constant time slot is made to be switched.

5 is an interface diagram of the plurality of signal relays 23 and the switching controller 24 according to the present invention, in which 38 is a shift register, 39 and 41 are inverters, and 40 is an AND gate, respectively.

As shown in the figure, the interface device between the plurality of signal relays and the switching controller in the HDLC communication between the signal relay 23 and the switching controller 24 of FIG. 2 is the signal relay 23 of FIG. ) And the inverted clock signal by the inverter 39 as the input signal and the mask signal from the signal relay unit 23 of FIG. The AND gate 40 for logical AND operation using a type force, the inverter 41 for inverting the output signal of the AND gate 40, and the output of the inverter 41, and the switching controller 24 of FIG. It consists of a shift register 38 which outputs to the signal relay of each shelf according to the enable signal from the shelf. The overall operation is performed by the control of the signal relay 23 and the switching controller 24 of FIG. Only when there is communication Since the signal relay unit 23 can communicate sequentially.

6 is a control block diagram of a network synchronizer according to the present invention, in which 42 is a line driver, 43 is a clock generator, and 44 is a multiplexer, respectively.

As shown in the figure, the network synchronizer clock control unit receives an 8k input from the primary group interface unit of each shelf and outputs a multiplexing output under the control of the CPU, and an 8k multiplexing output signal from the multiplexer 44. A clock generator 43 for outputting the generated clock and a clock driver 43 and a line driver 42 for supplying 4M, 2M, and 8k network clocks to the signal relay unit by receiving the clock from the clock generator 43. ).

Referring to the operation procedure for the configuration, one of the four primary group speed interface unit 26 of the second FIG. 2 connected to the local exchange when receiving the reference 8K kHz signal for forming a network in the clock generator 43 Select the 8K㎐ signal. If the primary group speed interface unit 26, to which the 8K Hz signal is connected, loses its function, the switching control unit 24 of FIG. 2 detects this to receive the 8KHz signal of the other primary group speed interface 26. The multiplexer 30 is controlled.

Therefore, the present invention as described above is composed of analog or digital subscribers, most of the conventional technology is different from the configuration of the general information and communication network, and in the advanced countries still in the stage of pilot network operation, the digital and ISDN network is configured in common However, there is a difference in the configuration module, and as a subscriber and network interface for ISDN NT12, it functions as an ISDN private exchange, thus providing a foundation as a private exchange in implementing an ISDN network. The process is divided into two boards for real-time processing, and the B channel information is centralized through a relay report, and switching is performed to efficiently handle the load of B channel information from multiple subscribers.

Claims (1)

ISDN network subscriber side interface can be used to connect ISDN telephone or terminal terminator, etc. One interface can accommodate 8 subscribers, and process specific data and basic access information (2B + D) of subscriber side S interface units 22 to 22N for allocating B and D channels to the first group access interface unit 21 and receive the B and D channels from the S interface units 22 to 22N to the system bus. Separated into a channel and a D channel, the B channel bundles and transmits the S interface units 22 to 22N, and the D channel transmits the information via the signal relay unit 23 and the signal relay unit 23 through the HDLC bus. 2B + D) performs a call control protocol and performs a switching function when the call control information requires switching, and receives a network synchronizer clock to receive a clock synchronized with the network. 3) a switching control unit 24 for supplying maintenance information such as call state, billing information, and system state information of the subscriber through DPRAM, and call state, charging information, and system state of the subscriber from the switching control unit 24; The main control unit 25 which transfers maintenance information, such as information, through the DPRAM to the personal computer 26, which is the attendant console, is connected to the S interface 22 to 22N by a system bus, and is connected to the local exchange side. In the integrated information communication network medium-capacity network terminator comprising a primary group speed access interface (21) connected to the switching control unit (24) to provide a network synchronizer clock; RCLK, which is the HDLC clock of the signal relay unit 23 and the switching controller 24, is the inverted clock signal of the inverter 39 as one input, and the mask signal from the signal relay unit 23 is the type force. AND means 40 for performing an AND operation, and the output signal of the end means 40 receives the output of the inverter 41 and outputs the signal to the signal relay of each shelf according to the enable signal from the switching controller 24. And a shift register (38). A switching control device for a medium-capacity network terminating device, characterized in that it comprises a shift register (38).