KR19990053251A - Independent communication port link device for easy expansion of communication ports - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an independent communication port link device that can easily expand a communication port.

2. The technical gist of the invention to solve

An object of the present invention is to provide an independent communication port link device that is easy to expand a communication port that can be easily applied to a large-capacity exchange field by accommodating a necessary communication port by expanding only one communication port transmission / reception control function. have.

3. Summary of the Solution of the Invention

The present invention provides cell transmission means for controlling a signal flow for transmitting cell signals received from a subscriber to the processor; Transmission link means for matching a signal transmitted from said cell transmission means with said processor; Cell receiving means for controlling a signal flow for transmitting cell signals from the processor to the subscriber; And receiving link means for matching a signal transmitted from the cell receiving means with the subscriber.

4. Important uses of the invention

The present invention is used to easily expand a communication port with minimal hardware change at the time of communication port scholarship.

Description

Independent communication port link device for easy expansion of communication ports

The present invention relates to an independent communication port link device that can easily expand a communication port in a multiplexer / demultiplexer matching device for communication between primary communication media. An independent communication port link device that can be easily extended.

1 is a block diagram of an ATM switching system to which a conventional multiplexer / demultiplexer matching device is applied.

As shown in FIG. 1, the ATM switching system to which a conventional multiplexer / demultiplexer matching device is applied includes an ATM switch 120 and an ATM switch (switching transmission signals from a plurality of subscribers 111, 112, and 113). A plurality of processors (140-1 to 140-n) to perform a processing function by using the signals transmitted from the multiple and demultiplex unit 130 and the multiple and demultiplex unit 130 to multiplex and demultiplex the signal transmitted from 120 ).

The operation of the ATM switching system to which the matching device of the conventional multiplexer / demultiplexer having the structure as described above is applied is as follows.

The multiple and demultiplex unit 130 is a matching device that performs a function of providing a bidirectional communication path between a plurality of communication media located at a long distance, but FIG. 1 shows an example applied to an ATM switching system, but it is also applied to an actual large computer system. This is possible. Referring to the operation of the multiple and demultiplex unit 130 in FIG. 1, first, a path for transmitting a cell from subscriber 1 111 to processor 1 140-1 is described. In order to transmit a cell to the terminal 140-1, an address of a destination to be sent, that is, a virtual path identifier (VPI) is first transmitted, followed by corresponding data.

Assuming that the VPI value of the subscriber 1 111 is 100 and the VPI value of the processor 1 140-1 is 200, the subscriber 1 111 wants to transmit with the VPI value 200 of the processor 1 140-1. The data is transmitted to the ATM switch 120. The ATM switch 120 transmits the data to the multiplexing and demultiplexing unit 130 according to the VPI value, and the multiplexing and demultiplexing unit 130 checks the received VPI value and then, if the VPI values of the corresponding processors are the same. If the cell is accepted and the VPI value is independent of the values of its processors, discard the cell. Since the VIP value of the received data is 200, the multiplexing and demultiplexing unit 130 transmits the corresponding data to the processor 1 140-1. The transmission process from the processor 1 140-1 to the subscriber 1 111 is transmitted in the reverse order. The VPI value and size can be changed as much as the size of the system and the structure change.

However, in the conventional technology as described above, its size is fixed structurally, so it is difficult to apply it to a large capacity exchange field, and in order to apply to the large capacity exchange field, it is inevitable that the entire hardware is modified due to the size change of the multiplexer.

2 is a block diagram of a transmission and reception controller applied to a conventional multiplexer / demultiplexer matching device.

As shown in FIG. 2, a transmission / reception controller applied to a conventional multiplexer / demultiplexer matching device includes a higher layer unit 210, a first-in first-out unit 220, a cell transmission controller 230, and a multiplexer ( 240, transmit chips 251 and 252, receive chips 261 and 262, a multiplexer 270, a cell receiver controller 280, and a first-in first-out unit 290.

A transmission / reception controller applied to a conventional multiplexer / demultiplexer matching device having the structure as described above will now be described.

The conventional transmit / receive controller is largely divided into a transmit controller and a receive controller, and each controller connects a communication port using a hardware device called multiplex. In such a structure, the size of the multiplex must be enlarged for hardware expansion, but the actual multiplex is difficult to construct more than 16: 1 hardware, and even if the size of the multiplex can be increased, the size of the multiplex is too large. In addition to the drop in the degree of integration, the system appearance is difficult to mount due to the increase in the appearance of the system, and the change of the multiplex size is a problem that takes a long time in terms of hardware development inevitably to modify the entire hardware soon.

Accordingly, the present invention has been made to solve the above-mentioned problems, and the large capacity exchange by accommodating the necessary communication port through the expansion of only one communication port transmission and reception control function for controlling the transmission and reception flow of the communication port Independent communication port that can be easily applied to the field and can easily expand the communication port by removing the multiplexing function and separating the control function of each communication port to maintain the independence between the communication ports. The purpose is to provide a link device.

1 is a block diagram of an ATM switching system to which a conventional multiplexer / demultiplexer matching device is applied.

2 is a block diagram of a transmission / reception controller applied to a conventional multiplexer / demultiplexer matching device.

3 is a block diagram of an embodiment of an independent communication port linkage device for easily expanding a communication port according to the present invention;

4 is a block diagram of an embodiment of a communication port transmission control unit of FIG. 3;

5 is a block diagram of an embodiment of a communication port receiving control unit of FIG. 3;

* Explanation of symbols for main parts of the drawings

310: upper layer unit 320: cell transmitter

321, 322: 1 communication port transmission control unit 323: transmission first-in first-out

324: transmitting cell counter 330: cell receiving unit

331, 332: 1 communication port receiving control unit 333: receiving first-in first-out unit

334: Receiving cell counter 335: 1 port receiving cell control unit

341, 342: transmission link unit 351, 352: reception link unit

Independent communication port link device that is easy to expand the communication port of the present invention for achieving the above object is an independent communication port link device for transmitting a signal transmitted from the subscriber to the destination processor and a signal from the processor to the subscriber A cell receiving means for controlling a signal flow for transmitting cell signals received from said subscriber to said processor, a transmission link means for matching a signal transmitted from said cell transmitting means with said processor, a cell from said processor Cell receiving means for controlling a signal flow for transmitting signals to said subscriber and receiving link means for matching a signal transmitted from said cell receiving means with said subscriber.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3 to 5.

3 is a block diagram of an embodiment of an independent communication port link device for easily expanding a communication port according to the present invention.

As shown in FIG. 3, the independent communication port link device that can easily expand a communication port according to the present invention includes a cell transmitter 320 that largely controls a cell transmission flow, and a cell receiver that controls a cell reception flow. 330, a transmission link unit 341, 342 and a receiving link unit 351, 352 provided to a telecommunication medium and a cell transmission / reception port.

The cell transmitter 320 controls a flow for transmitting a communication port, that is, cells received from a subscriber, to an destination processor through an ATM switch, and the cell receiver 330 performs the opposite function of the cell transmitter 320. Cells received from (not shown) performs a function of controlling the flow of the cell to transmit the cell to the subscriber.

In the present invention, the cell transmitter 320 and the cell receiver 330 have one transmission and reception control unit for each communication port in order to separate each communication port, and this is one communication port transmission control unit 321 and one communication port reception control unit. It is referred to as (331). The transmission link units 341 and 342 and the reception link units 351 and 352 are parts for performing transmission / reception matching function with the processor and the cells.

In the present invention, the multiplexer which is a limiting factor in port expansion has been eliminated in the prior art, but in the prior art, two independent communication ports are required to perform the standby loading function, but are bundled into multiplexes. Since two transmission and reception communication ports are used, since four communication ports are actually used, there is a problem in that resources are not used efficiently. In order to solve the above problems, the present invention has separated each communication port, and in order to separate the communication ports, one port transmission / reception control unit, which is a distributed control device, is provided to control each communication port individually. It is possible to expand the communication port by adding only one communication port transmission / receiving control part as necessary when expanding the communication port.

First, the operation of the cell transmitter will be described.

Cells received from the ATM switch are received via the cell data line, which is stored in the transmit first-in, first-out 323 while the cell write signal is enabled. The cell cell signal is enabled for 64 clocks because ATM cell format within the ATM switching system under development in Korea is defined as 64 bytes per cell. The transmit cell counter 324 of the cell transmitter 320 calculates 64 cell clocks from the time point at which the cell write is enabled, enables the one cell transmission completion signal at the moment when the counter value is exceeded. Since the 64-byte cell data, that is, one cell is stored in the first-in, first-out unit 323, the control unit 321 transmits a signal to transmit. After receiving the one-cell transmission completion signal, the one-port transmission cell control unit 325 enables the cell read signal and enables it for 64 cell clocks to transmit one-cell data to be transmitted from the first-in, first-out unit 323 through the cell data line. Read. In order to transmit the read cell data to the transmission link unit 341, the one-port transmission cell control unit 325 transmits a one-cell start command to the transmission link unit 341, and then a strobe which is a cell data valid signal for 64 cell clocks. Enables the signal to read one cell data from the first-in first-out sender 323 and transmits a one-cell termination command to the transmission link unit 341 via the command line. Cell data contents read through the data line during this time. Is transmitted to the transmission link unit 341 to transmit one cell data to the processor. Each communication port controls the flow of a transmission cell by the one-port transmission cell control unit 325, and the cell transmission unit 320 may add one communication port transmission control unit as many as necessary to accommodate a necessary communication port. For example, for the sixteen transmission communication ports, sixteen one communication port transmission control units may be used. Of course, in order to extend from 16 transmission communication ports to 17 transmission ports, the cell transmission unit may be configured by using 17 one communication port transmission control units. In the prior art, there is a problem in that a 32: 1 multiplexer must be used in a 16: 1 multiplexer to expand from 17 transmit ports to 17 transmit ports, resulting in a problem of not using hardware size and resource sufficiently.

Next, the operation of the cell receiver will be described.

Cells received from the processor are received via the receiving link unit 351. The cells input to the receiving link unit 352 receive the cells by a predetermined transmission protocol (ATM cell transmission protocol). The received cell is divided into cell data and instructions by the reception link unit 351. When a one-cell start command and a strobe signal are received through the reception link unit 351, 64-byte cell data and a data strobe are entered. When all of the 1-cell data comes in, the 1-cell termination command and the strobe enter the 1-port receiving cell controller 335. At this time, the one-port receiving cell controller 331 enables the cell write signal to store the cell data received from the receiving link unit 351 in the first-in first-out unit 333. At this time, the reception cell counter 334 calculates the cell clock while the cell write signal is valid in order to generate a one-cell reception completion signal, which is a signal indicating that 64 bytes have been stored in the reception first-in, first-out unit 333. When the first cell reception completion signal is generated and notified to the upper layer unit, the upper layer unit 310 reads the cell data by knowing that there is one cell data to be transmitted to the reception first-in-first-out unit 333. The receiving first-in, first-out unit 333, the one-port receiving cell control unit 335 and the receiving cell counter 334 is a part called one communication port receiving control unit, and performs a function of controlling one communication port, By adding and matching one port receiver J as many as necessary communication ports, the cell receiver 330 having the necessary communication ports can be configured.

4 is a block diagram of an embodiment of a communication port transmission control unit of FIG. 3.

As shown in FIG. 4, the one communication port transmission control unit of FIG. 3 includes a transmission first-in first-out unit 323, a transmission cell counter 324, a one-port transmission cell control unit 325, and a link state signal transmission unit. (326).

4 is a port structure of the cell transmitter using the multiplexer of FIG. 2, and after removing the multiplexer, the ports are separated and replaced with an independent port structure to expand the communication port, and the one port transmission cell controller corresponding to one port. It shows the internal structure in detail.

The operation of the one-port transmission cell control unit of FIG. 3 having the above structure will be described in detail as follows.

When the cell write signal is enabled from the upper layer unit 310, one cell data is stored in the first-in, first-out unit 323. At this time, the transmission cell counter 324 transmits the one-cell transmission completion signal to the one-port transmission cell control unit 325 when the one-byte data of 64 bytes is valid as the cell write signal and the cell clock signal.

The one-port transmission cell control unit 325 prepares to transmit the cell to the transmission link unit 341 if one or more cells are included in the transmission first-in, first-out unit 323 if the number of cells received is valid. The one-port transmission cell control unit 325 transmits the one-cell start command and the strobe signal to the transmission link unit 341 via the command line and the strobe line if there is more than one cell data in the first-in, first-out unit 323. One cell of 64 bytes of data is sequentially transmitted to the matching unit of the other transmission medium through the transmission link unit 341 using the cell data line. When the transmission of the one cell data is completed, the one cell end command and the strobe signal are transmitted to the command line. Send to strobe line.

The link state signal transmitting unit 326 periodically checks in advance whether there is an abnormal state of a link informing the other receiving medium that its port is alive when the one-port transmitting cell control unit 325 is activated. As a promised protocol, it transmits through the command line and strobe line to the transmission medium of the other side.

FIG. 5 is a block diagram of an embodiment of a communication port receiving control unit of FIG. 3. FIG.

As shown in FIG. 5, the one communication port receiving control unit of FIG. 3 includes a reception first-in, first-out unit 335, a reception cell counter 334, a one-port reception cell control unit 335, and a link state signal reception unit 352. With

The communication port receiving cell control unit of FIG. 5 removes the port structure of the cell receiving unit using the multiplexer of FIG. The internal structure of the 1 communication port receiving control unit corresponding to 1 port is shown in detail.

The operation of the communication port receiving control unit 1 of FIG. 3 having the above structure will be described in detail as follows.

When a command defined as a link state signal command is input to the link state signal receiving unit 352 among data and commands input through the receiving link unit 351, it is determined that the state of the other medium is normal. If the link state is normal, the one-cell reception start command and strobe signal are input from the reception link unit 351, and if the data and data strobe and the one-cell reception end command and strobe are input, the one-port cell reception control unit 335 is received. Send cell data.

The one-port receiving cell control unit 335 receives a cell start command among commands input from the receiving link unit 351, receives one cell data of 64 bytes, and stores an ATM cell in the receiving first-in-first-out unit 333. When the cell termination command is input, the received cell counter checks whether the received data is 64 bytes. If more or less than 64 bytes is received, the received data is stored incorrectly in the first-in-first-out unit 333 for cell alignment for the next data. Discard all data. If the normal 64-byte data is received, the 1-cell reception completion signal is transmitted to the upper layer unit 310 indicating that 1-cell transmission is completed.

The link state signal receiving unit 352 serves to prevent the built-in timer from timeout by using the command defined as the link state signal from the receiving link unit 351. If the link status signal from the reception link unit 351 does not come within a specified time due to some cause, the transmission device of the opposite medium is in a fault state and a fault signal is generated and notified to the upper layer unit 310.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the independent communication port link device, which is easy to expand the communication port of the present invention, removes the multiplex and separates all communication ports from the communication ports that are conventionally used as multiplexes, thereby removing the same existing resources. In terms of scalability of the communication port, many hardware changes were involved in the existing structure. However, each communication port is separated and each communication port is processed to control cell transmission / reception by a one-cell transmission / reception control unit. When an increase is needed, the 1-cell transmission / reception control unit is additionally matched to easily increase the port so that the present invention can be easily applied to a large-capacity switching system. In addition, the present invention is not merely applicable to a large-capacity switching system, but also provides a communication port between remote communication media. In one place Because it can be applied to all systems using a centralized communications port device for providing a communication port of Hogan that application has an effect capable of those used in the communication path in the large-capacity Kim computer system as well as communications.

Claims (3)

An independent communication port link device for transmitting a signal transmitted from a subscriber to a destination processor and transmitting a signal from the processor to the subscriber, the apparatus comprising: controlling a signal flow for transmitting cell signals received from the subscriber to the processor Cell transmission means, transmission link means for matching a signal transmitted from the cell transmission means with the processor, cell reception means for controlling a signal flow for transmitting cell signals from the processor to the subscriber and from the cell reception means And an independent communication port link device for easily expanding a communication port including a receiving link means for matching a transmitted signal with the subscriber. 2. The cell transmitting means according to claim 1, wherein the cell transmitting means comprises: transmitting cell counting means for counting cells transmitted from the outside, transmission first-in, first-out means for temporarily storing cells transmitted from the outside, and transmission cell counting means and transmission first-in, first-out means. A port transmission cell control means for receiving the transmitted signal and outputting a cell start command signal and a strobe signal to the outside; and a link state signal transmission means for providing a link status signal according to an operation state of the port transmission cell control means. Independent communication port link device for easy expansion of communication ports, including. The cell receiving means according to claim 1, wherein the cell receiving means comprises: a port receiving cell control means for receiving a cell start command signal and cell data received from the outside and outputting an asynchronous transfer mode cell and a control signal; Receiving cell counting means for counting the received cell, receiving first-in, first-out portion for temporarily storing and asynchronously storing the asynchronous transfer mode cell, and controlled by the port receiving cell control means, and the other side according to the link state signal received from the outside. An independent communication port link device for easily expanding a communication port including a link state signal receiving means for outputting a fault signal indicating a fault state of a medium to the outside.