KR100223366B1 - Apparatus for selecting communication channel in data communication system - Google Patents

Abstract

A circuit for selecting data on a data communication channel includes a first receiving data communication channel processing section for receiving and demultiplexing data received on a first link and a second receiving data communication processing section for receiving and demultiplexing data received on a second link, A first transmission data communication channel processing unit for multiplexing the received data and outputting the multiplexed data to the first link, a second transmission data communication channel processing unit for multiplexing the received data and outputting the multiplexed data to the second link, And a first transmitting unit and a second transmitting unit for generating transmission data, wherein the data communication channels of the data communication channels are divided into a plurality of data communication channels, And a second reception data communication channel processing unit of the monitoring and control apparatus, A first controller for controlling the output of the first reception data communication channel processing unit and the first reception unit and the third controller of the monitoring control apparatus, A second controller for controlling the output of the first receiving data communication channel and the second receiving data communication channel by a second control signal, A second controller which is connected between the output terminals of the first and second transmission units and the first and second transmission data communication channel processing units and forms an output path of transmission data by a third control signal, And a fourth controller for turning on the third controller and the fourth controller at the time of the root diversity to transmit the data communication channel information output from the received data communication channel processing units to the first and second control signals And transmits the first and second transmission data to the first and second transmission data communication channel processing units, respectively. Otherwise, the third controller and the fourth controller are turned off to perform the operation of the loop diversity Stop.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a data communication channel selection circuit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transmitting data under a synchronous multiplexing structure, and more particularly, to a circuit for selectively switching a data communication channel in a data transmission apparatus configured with root diversity and operated with a spare channel and an operation channel.

Generally, digital data is transmitted through the path, the player section, the multiplexer section, and the physical media step by step. Applying the layered concept to the digital transmission process can be divided into a path layer, a multiplexer section layer, a player section layer, and a physical medium layer. At this time, the physical media layer used in the optical transmission system becomes the optical layer.

The synchronous multiplexing structure adopts the layered concept as described above and performs a systematic spatial arrangement. FIG. 1 is a diagram illustrating a format for distinguishing STM-n frames according to their functions. The overhead of the player section and the overhead of the multiplexer section are overheads applied to the player section and the multiplexer section respectively. Path overhead is overhead applied to the path layer, and overheads for other low paths are in the STM payload space.

The overhead used in the synchronous multiplexing is divided into a section overhead (SOH) and a path overhead (POH) according to the layered concept described above. Of these, SOH includes relay interval overhead and multiplexer interval overhead. The SOH is inserted into the last stage in which the STM-n signal is to be constructed, and the POH is inserted every time a virtual container signal is constructed.

SOH is an overhead that is inserted and extracted in a regenerator or a multiplexer section for the purpose of indicating, operating, and maintaining transmission performance of an STM-n signal. As shown in FIG. 1, an SOH on a pointer (PTR) is used for a player section and a lower SOH is used for a multiplexer section.

FIGS. 2A and 2B show the structure of the segment overhead SOH and path overhead POHs in the STM-1 frame. The function of each byte in FIG. 2A is as follows. A data communication channel (hereinafter referred to as DCC), E1-E2: another line, F1-F2: a data communication channel K1-K2: Atomic Protection Switching (APS), Z1: -Z5: Reserved overhead for other purposes.

Among the SOHs, the DCC is data essential for the operation, maintenance, and maintenance of the transmission apparatus. That is, the system for transmitting data transmits data for monitoring and controlling the apparatus using the DCC. The method of operation of the DCC is recommended in G.783, G.784 and G.707 of ITU-T. 3 shows a connection state between the multiplexing apparatus 30 and the monitoring control apparatus 20 in the optical transmission system. Here, the multiplexer 30 multiplexes transmission data and demultiplexes the received data (Multiplexing Demultiplexing). In the embodiment of the present invention, this is referred to as a multiplexer. 3, the transmission system of the DCC is output from the DCU 21 of the supervisory control device 20, multiplexed through the transmission DCC processor 31 and the MUX 32 of the multiplexer 30, and then converted into an electronic to optical converter (E / O) And is output to the optical transmission line. The overhead received by the optical transmission line is converted into an electrical signal by an O / E (O / E) converter 34, demultiplexed by a DEMUX 35, and then transmitted to a receiving DCC processor 36 And output to the DCU 21 of the monitoring control device 20. At this time, the MPU 22, which is the control unit of the monitoring control device 30, generates the control signal CTL for selecting the output of the receiving DCC processing unit 36.

In general, the DCC processing unit is designed to use a redundant channel as a spare and operation channel, and to select a good line among the constituent networks to transmit the DCC. Therefore, the configuration for transmitting the DCC is composed of a standby channel and an operating channel as shown in FIG. 4. The network configuration is such that a 1 + 1 switching ratio is provided as shown in FIG. 5 . Referring to FIGS. 4 and 5, in the conventional DCC process, two optical transmission lines for transmitting digital data of a spare channel and an operation channel are located on the same route that is not regionally separated, And is used for switching to a spare channel when an error occurs in the operating channel. That is, when the optical transmission line of the operating channel is disconnected, data can be transmitted through the spare channel. At this time, in the network having the 1 + 1 change ratio as described above, the DCC connection processing is performed as shown in FIG. Here, it is assumed that the configuration in which the reference A is added in the multiplexer 30 is a configuration of the spare channel and the configuration in which the reference code B is added is the configuration of the operation channel.

5, the transmission unit 25 of the DCU 21 outputs the clock and data to the transmission DCC processing units 31A and 31B of the multiplexing device 30 in common, and the MUXs 32A and 32B, respectively, And outputs multiplexed data to the corresponding optical transmission line. That is, the transmitter 25 of the DCU 21 commonly uses the clock and data for the spare and operation channels when transmitting the DCC. Upon reception, the DEMUXs 35A and 35B demultiplex the received data, and the corresponding receiving DCC processors 36A and 36B process and output the received DCC, respectively. The outputs of the receiving DCC processors 36A and 36B are connected to the tri-state buffers 37A and 37B controlled by the control signals CTL1 and CTL2, respectively, and these outputs are connected to the receiver 26 of the DCU 21. [ The control signals CTL1 and CTL2 are switching information that can selectively receive the received DCC and are output from the MPU 22 of the monitoring control device 20. [ Therefore, the received DCC selects and inputs a good DCC by the control signals CTL1 and CTL2 output from the monitoring control device 20. [

As shown in FIG. 5, it is possible to select a line that transmits relatively good data among the two channels to continuously perform communication without loss of data. However, when route diversity is configured, It becomes. That is, as shown in FIG. 6, in the root diversity network, the operation channel and the spare channel are transmitted separately in a geographical area, and two networks are managed in one terminal TM. In general, optical transmission lines are installed along roads and railways. For example, assuming that the spare channel of the A site is the central high-speed light and the operation channel of the B site is the high-speed light of the B site, And high-speed optical fiber. When the spare channel and the operation channel are operated through the root diversity, the data transmitted and received through the spare channel and the operation channel can use independent data. In this case, since the conventional DCC selection circuit can select only one good channel data among the two channels, information on the operating channel and the spare channel can not be simultaneously selected. Therefore, under the control of the supervisory control device 20, it is possible to selectively receive mutually independent data received on the working channel and the spare channel in the root diversity network respectively as valid information, or to select and receive a good DCC in the DCC received on both channels Should be able to.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a circuit capable of selectively switching a data communication channel according to switching information in a data transmission apparatus configured with root diversity and operating on a redundant channel and an operating channel.

According to an aspect of the present invention, there is provided a circuit for selecting data communication channel data, comprising: a first receiving data communication channel processor for receiving and demultiplexing data received from a first link; A first transmission data communication channel processing unit for multiplexing the received data and outputting the multiplexed data to the first link, and a second transmission data communication channel processing unit for multiplexing the received data to generate a second transmission data communication channel, And a second transmission data communication channel processing unit for outputting the transmission data to the first transmission data communication channel processing unit, a first reception unit and a second reception unit for receiving and processing the output of the received data communication channel processing unit, a first transmission unit for generating transmission data, 2 transmission processing unit for processing data communication channel data of the data communication channels; A third controller connected to the second reception data communication channel processing unit and controlling the formation of the output by the third control signal; a second controller for controlling the output of the first reception data communication channel processing unit and the first reception unit of the monitoring control apparatus, A first controller coupled between the output of the first receiving data communication channel processing unit and the output of the first receiving data communication channel processing unit and forming an output path of the first receiving data communication channel processing unit by a first control signal, A second controller coupled between the output of the first and second transmission units and the first and second controllers to form an output path of the first receiving data communication channel processing unit by a second control signal, And a fourth controller connected between the second transmission data communication channel processing units and forming an output path of the transmission data by the third control signal, And a fourth controller to transmit the data communication channel information output from the reception data communication channel processing units to corresponding reception units set by the first and second control signals and to transmit the first and second transmission data To the first and second transmission data communication channel processing units, respectively. Otherwise, the third controller and the fourth controller are turned off to stop the operation of the loop diversity.

1 is a diagram showing an STM-n frame structure

FIG. 2A is a diagram showing an interval overhead structure in FIG. 1, FIG. 2B is a diagram showing a path overhead structure

3 is a diagram showing a configuration for processing a data communication channel between a monitoring control device and a multiplexing device in an optical transmission system

4 is a diagram showing a configuration in which multiplexing devices having spare channels and operating channels are connected to other remote multiplexing devices and perform 1 + 1 switching;

5 is a diagram for explaining an operation of selecting a data communication channel between the multiplexing apparatus and the monitoring control apparatus as shown in FIG.

6 is a diagram showing a form in which the multiplexing apparatuses having the spare channel and the operation channel are connected in the form of root diversity with other remote multiplexing apparatuses

7 is a diagram for explaining an operation of selecting a data communication channel according to an embodiment of the present invention between a multiplexing device connected in a root diversity form and a monitoring control device as shown in FIG.

The apparatus for processing data communication channel data according to an embodiment of the present invention processes DCC in a root diversity manner as shown in FIG. 5, and in this case, DCC of two independent channels can be processed according to a control mode, So that a good line can be selected according to the DCC processing method of FIG. 7 is a diagram showing a configuration of a data communication channel selection circuit according to an embodiment of the present invention. Here, it is assumed that the transmission unit 111-112 and the reception unit 211-212 are LAPD controllers, and the data format output from the DCU 21 has a LAPD frame structure.

Here, the buffers 215, 216, and 217 constitute a first controller that controls the output of the first receiving DCC processing unit 213 to be output to the first receiving unit 211 or the second receiving unit 212 according to the state of the first control signal CTL1 . In addition, the buffers 218, 219, and 220 have a configuration of a second controller that controls the output of the second receiving DCC processor 213 to be output to the second receiver or the first receiver 211 according to the state of the second control signal CTL2. The buffer 221 is connected between the output terminal of the buffer 216 of the first controller and the buffer 218 of the second controller and the second receiver 212 to control the performance of the root diversity function according to the state of the third control signal CTL3. Controller.

Referring to FIG. 7, the transmission operation of the DCC will be described. The first transmission unit 111 and the second transmission unit 112 are located in the DCU 21, and generate and output a DCC to be transmitted. At this time, it is possible to output the same DCC by dividing into the spare channel and the operation channel, or output the independent DCC by the root diversity configuration. To this end, the MPU 22 of the monitoring control device 20 generates a third control signal CTL3 for selecting the DCC processing method. The third control signal CTL3 is a signal that controls the DCC of two independent channels or can process the DCC in a conventional manner. In the embodiment of the present invention, when the CTL3 is output as a low logic, it is assumed that the DCC is processed by the former method, and when the CTL3 is outputted as the high logic, the DCC is processed by the latter method.

The first transmission DCC processing unit 121 receives and processes the DCC output from the first transmission unit 111, and outputs the DCC to the MUX 32. The second transmission DCC processing unit 122 receives and processes the DCC output from the tri-state buffer 117, and outputs the DCC to the MUX 32. State buffer 117 is connected between the second transmission unit 112 and the second transmission DCC processing unit 114 and is controlled by the third control signal CTL3. The tri-state buffer 115 is connected between the first transmission unit 111 and the second transmission DCC processing unit 114 and is switched and controlled by the third control signal CTL3 outputting the inverter 116. [

Therefore, when the third control signal CTL3 is output as a logic high, the buffer 115 is turned on and the buffer 117 is turned off, so that the DCC output of the second transmitting unit 112 is interrupted and the output of the first transmitting unit 111 is output to the second transmitting DCC processing unit . In this case, the first transmission DCC processing unit 113 and the second transmission DCC processing unit 114 process the same DCC output from the first transmission unit 111 and transmit the same. However, when the third control signal CTL3 is outputted as a logic low, the buffer 117 is turned on and the buffer 115 is turned off. The DCC output of the first transmitter 111 is interrupted and the DCC output path of the second transmitter 112 is formed. Then, the first transmission DCC processing unit 113 processes the DCC output from the first transmission unit 111, and the second transmission DCC processing unit 114 processes the DCC output from the second transmission unit 112. Therefore, the first transmission DCC processor 113 and the second transmission DCC processor 114 process DCC of independent channels, respectively.

The first receiving DCC processing unit 213 and the second receiving DCC processing unit 214 receive and process the DCC that is demultiplexed and output by the multiplexer 30, and outputs the DCC. The 3-state buffer 215 is connected between the output terminal of the first receiving DCC processor 213 and the first receiver 211, and is switched and controlled by the first control signal CTL1. The 3-state buffer 216 is connected to the output terminal of the first receiving DCC processor 213 and is switched and controlled by the first control signal CTL1 inverted through the inverter 217. The 3-state buffer 218 is connected to the output terminal of the first receiving DCC processing unit 214 and is switched and controlled by the second control signal CTL2. The tri-state buffer 219 is connected between the second receiving DCC processor 214 and the first receiving unit 211 and is switched and controlled by the second control signal CTL2 inverted through the inverter 220. [ State buffer 221 is connected between the output terminals of the tri-state buffers 218 and 216 and the output terminal of the second receiving section 212, and is controlled by the third control signal CTL3.

First, the MPU 22 generates control signals CTL1-CTL3 according to the set DCC processing method. At this time, in the case of the route diversity, the MPU 22 outputs 0 as CTL1-CTL3. The tri-state buffers 216 and 219 are then turned off and the tri-state buffers 215, 218, and 221 are turned on. The DCC output from the first receiving DCC processor 213 is output to the first receiver 211 through the buffer 215 and the DCC output from the second receiving DCC processor 214 is output to the second receiver 212 through the buffers 218 and 229. Then, the first receiving unit 211 and the second receiving unit 212 process independent signals to perform a root diversity function.

If not the second, the third control signal CTL3 is output as a logic high. Since the tri-state buffer 221 is turned off, the output path of the DCC output to the second receiving unit 212 is blocked. In this case, control signals CTL1-CTL2 are generated to enable the first receiving unit 211 to select and output a DCC of good quality from the DCC output from the first receiving DCC processing unit 213 or the second receiving DCC processing unit 214. [ At this time, when the DCC of the first receiving DCC processor 213 is selected and output, the control signals CTL1-CTL2 are output as a low logic (0). Then, the tri-state buffers 215 and 218 are turned on, so that the DCC outputted from the first receiving DCC processor 213 is transmitted to the first receiver 211, but the tri-state buffer 221 is turned off and outputted from the second receiving DCC processor 214 The DCC can not be delivered to the second receiving unit 212. When the DCC of the second receiving DCC processor 214 is selected and output, the control signals CTL1-CTL2 are output as high logic (0). Then, the tri-state buffers 216 and 219 are turned on so that the DCC output from the second receiving DCC processor 214 is transmitted to the first receiving unit 211, but the tri-state buffer 221 is turned off and outputted from the first receiving DCC processor 213 The DCC can not be delivered to the second receiving unit 212.

As described above, the operation of selecting the DCC according to the embodiment of the present invention is performed as shown in the following table. Here, when the third control signal CTL3 is a logic low, CTL2-CTL1 uses only 0, and other logic signals (001,010,011) are not used. When the third control signal CTL3 is high logic, the CTL2-CTL1 uses only 0 and 11, and the other logic signals 101 and 110 are not used. Therefore, the code used for the combination of CTL3-CTL1 uses three codes of 000, 100, and 111, and the five codes of 001, 010, 011, 101, and 110 are not used. The results are shown in Table 1 below.

Control signal buffer Remarks CTL3 CTL2 CTL1 215 216 218 219 221 0 0 0 ON OFF ON OFF ON Performs the root diversity function. Independently of each other, the A link data is applied to the first receiver and the B link data is applied to the second receiver. One 0 0 ON OFF ON OFF OFF If the A link data is better than the B link data, the A link data is applied to the first receiver and the B link data is blocked by the buffer 221. One One One OFF ON OFF ON OFF When the B link data is better than the A link data, the B link data is applied to the first receiver and the A link data is blocked by the buffer 221. [

As described above, in a data transmission apparatus having an operation channel and a spare channel, it is possible to independently process DCCs independently transmitted and received in the configuration of a root diversity network. Also, when the same DCC is transmitted, DCC Can be selected and received.

Claims (1)

A circuit for selecting data of a data communication channel, A first receiving data communication channel processing unit for receiving and demultiplexing data received in a first link and a second receiving data communication channel processing unit receiving and demultiplexing data received in a second link; A first transmission data communication channel processing unit for multiplexing the received data and outputting the multiplexed data to the first link, a second transmission data communication channel processing unit for multiplexing the received data and outputting the multiplexed data to the second link, A first receiving unit and a second receiving unit for receiving and processing the output of the received data communication channel processing unit, a first transmitting unit for generating transmission data, and a second transmitting unit for processing data communication channel data of the data communication channels A control device, A third controller which is connected to the second reception data communication channel processing unit of the monitoring control device and controls formation of an output by a third control signal, A first receiving data communication channel processing unit connected to an output terminal of the first receiving data communication channel processing unit and a first receiving unit of the monitoring control device and the third controller and configured to form an output path of the first receiving data communication channel processing unit by a first control signal, 1 controller, A second receiving data communication channel processing unit connected to the output terminal of the second receiving data communication channel processing unit and a first receiving unit of the monitoring control device and the third controller, 2 controller, And a fourth controller connected between the output terminals of the first and second transmission units and the first and second transmission data communication channel processing units and forming an output path of the transmission data by the third control signal, The third controller and the fourth controller are turned on at the time of the root diversity to transmit the data communication channel information output from the reception data communication channel processing units to the corresponding reception units set by the first and second control signals, And transmits the first and second transmission data to the first and second transmission data communication channel processing units, respectively. Otherwise, the third controller and the fourth controller are turned off to stop the operation of the loop diversity. Data selection circuit of communication channel.