KR100314354B1 - A Basic Rate Interface Unit of Integrated Services Digital Network in Fiber Loop Carrier-Curb Systems - Google Patents

Abstract

The present invention relates to a basic speed matching device of an integrated telecommunication network in a demand dense optical subscriber transmission device, comprising: a subscriber terminal (NT) of an integrated information communication network (ISDN) connected to a demand dense optical subscriber transmission device. This is to match the fundamental velocity (2B + D) data with the multiplexed E1 signal.

The present invention receives an E1 signal and separates the signal into two B and D channel units, and performs a function of extracting M bits and D bits, a data bus carrying digital data, and signal matching according to an operation mode. Relay between the M bits extracted from the unit and the M bits loaded on the data bus, or relay between the M bits and D bits received from an external device and the M bits and D bits loaded on the data bus, and analyze the received M bits. A main control unit for outputting monitoring / control data, two separate B-channels for signal matching unit, a D bit, and a pulse code modulation matching control unit for connecting the monitoring / control data to a corresponding place on the data bus, and a NT to the data bus. And a subscriber line matching unit for transmitting and receiving B channel data and M bits. At this time, the main control unit may be more preferably configured by implementing using one microprocessor.

Description

A Basic Rate Interface Unit of Integrated Telecommunication Network in Demand-Density Optical Subscriber Transmitter {A Basic Rate Interface Unit of Integrated Services Digital Network in Fiber Loop Carrier-Curb Systems}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basic speed matching device for an integrated telecommunication network in a demand dense optical subscriber transmission device, and in particular, an optical end unit (ONU: Optical Network Unit) of a demand dense optical subscriber transport device Connection between the network terminal of the Integrated Services Digital Network (ISDN) and the frame processing unit of the E1 class signal used for the optical terminal (ONU) at basic rate. It relates to a device for letting.

1 is a schematic diagram of a demand-intensive optical subscriber transmission device, service providers providing various services such as home-shopping, games, movies, and the like, asynchronous transmission mode switch 110 and demand-intensive optical subscriber transmission device 120. The service is provided to optical subscribers through a host digital terminal 121 (HDT) and an optical terminator (ONU) 122.

The demand-density optical subscriber transmitter 120 is a FTTC (Fiber To The Curb) service transmission platform, and provides an optical end device at a host digital terminal (HDT) 121 to provide telephone and video services to subscribers. (ONU: 122) transmits data through the optical path, and each subscriber from the optical termination unit (ONU) 122 uses standard telephone lines to deliver standard telephone and digital services.

The host digital terminal (HDT: 121) is a device installed in a telephone station, and connects DS1 and DS1E signals with an asynchronous transfer mode (ATM) based wideband signal transmitted from the broadband switching network, thereby providing a synchronous digital hierarchy. After integration-multiplexing, the optical transmission device (ONU) 122, which is a power device, performs the function of optical transmission and vice versa.

The optical terminator (ONU: 122) is installed in a distribution center in a dense residential area such as an apartment complex, and separates the subscriber signal from the optical signal received from the host digital terminal (HDT: 121) according to service and provides it to each subscriber. And a reverse function.

Meanwhile, a frame processing unit (FRU), which is a device for processing a signal in units of E1 frames, is generally used for the optical terminator (ONU) 122, and the frame processing unit is configured from each of the subscribers 131 and 132. The information received through the channel apparatus is aligned according to a predetermined number of E1 frames and transmitted upwardly (from the subscriber side to the network side) or downwardly (from the network side to the subscriber side) from each of the plurality of E1 frames. It is a device that performs the function of extracting the signal and information and transmitting it to the corresponding subscriber channel device.

At this time, a channel unit (CU) is a device that receives data and a clock from a frame processing unit (FRU) and directly connects with a subscriber. Basic Rate Matching Unit (BRIU), which is a channel device for communication network, is used. The channel device for an integrated information communication network is a digital terminal line (NTL) of a subscriber station (NTL) through a digital subscriber line (DSL). : Network Terminal, 132).

On the other hand, as mentioned above, the basic speed matching device (BRIU) is a device for connecting between subscribers of the integrated information communication network and the frame processing device of the optical terminator (ONU) 122, and is the basic of the integrated information communication network (ISDN). In order to provide the speed service, it is necessary to connect the optical terminator (ONU) 122 and the network terminator (NT: 132) of each subscriber station via an E1 signal composed of data having a 2B + D structure.

In addition, in order to perform this connection function, a process of processing the signal information bit (D bit) and the maintenance channel bit (M bit), etc., included in the signal channel D, of the 2B + D structure data is required. In the past, a separate chip (IDEC: ISDN D-channel Exchange Controller) was used for this process. Therefore, when processing the bits of the signal information (D bit) for each timeslot simultaneously, Interrupts occur frequently due to the limitation of the buffer capacity, which causes a problem of slowing down the processing speed.

Accordingly, the present invention has been made to solve the above problems, and is used in the demand-density optical subscriber transmission device to convert the network terminal (NT) of the subscriber side of the integrated information communication network (NTDN) into the basic information of the integrated information communication network. Speed (2B + D) data is matched with the multiplexed E1 signal, but the processing speed is improved by processing the signal information bits (D bits) and the maintenance channel bits (M bits) directly by the microprocessor. It is an object of the present invention to provide a basic speed matching device for an integrated information communication network in a dense optical subscriber transmission device.

In order to achieve the above object, the basic speed matching device of the integrated telecommunication network in the demand-density optical subscriber transmission device according to the present invention receives the E1 signal in units of two bearer channels (B) and signal channels (D). A signal matching unit for separating and extracting a maintenance channel bit (M bit) and the signal information bit (D bit) of the signal channel and a reverse function thereof; A data bus that carries digital data; Depending on the operation mode, a relay between the maintenance channel bit (M bit) extracted from the signal matching unit and the maintenance channel bit (M bit) loaded on the data bus or received from an external device of the basic speed matching device Relay channel bits (M bits) and signal information bits (D bits) and the holding channel bits (M bits) and signal information bits (D bits) carried on the data bus, A main controller for analyzing (M bits) and outputting monitoring / control data; Pulse code modulation matching connecting two separate bearer channels (B), a signal channel (D), and a monitoring / control signal channel of the main control unit with a corresponding place of the data bus under the control of the main control unit. Control unit; And a subscriber line matching unit connected to the data bus and exchanging bearer channel (B), signal channel (D), and maintenance channel bit (M bit) information with the network termination device NT of the subscriber-side terminal. It is characterized in that the configuration.

At this time, the main control unit is configured using one microprocessor, ROM (ROM) for storing the operation program of the microprocessor, and RAM (RAM) for temporarily storing data generated during the operation of the microprocessor and It can be configured more preferably by being configured together.

1 is a schematic diagram of a demand-density optical subscriber transmission device,

2 is a configuration diagram of a basic speed matching device according to the present invention;

3 is a channel structure diagram of an IOM-2 bus;

4 is a loopback schematic diagram of a basic speed matching device.

* Explanation of symbols for main parts of the drawings

120: demand dense optical subscriber transmission device (FLC-C system)

121: host digital terminal (HDT) 122: optical termination (ONU)

132: subscriber station 200: basic speed matching device

210: signal matching unit 220: main control unit

221: microprocessor 222: memory

230: pulse code modulation matching control unit 240: IOM-2 bus

250: subscriber line matching unit

251: Digital Subscriber Line (DSL)

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

2 is a block diagram of the basic speed matching device 200 of the integrated information communication network in the demand-dense optical subscriber transmission device according to the present invention, the signal matching unit 210, the main control unit 220, the pulse code modulation matching control unit 230, an integrated data communication network-based data bus 240 (hereinafter, referred to as an ISDN Oriented Modular-2 Bus), and a subscriber line matching unit 250.

The basic speed matching device 200 of the present invention is used as a general information communication network subscriber device mounted on the optical termination device (ONU) 122 of the demand-dense optical subscriber transmission device, and is a 2B1Q (2 Binary 1 Quaternary) transmission method. Basic Rate Accepts one or more subscriber lines. In addition, the main control unit 220 performs a self-initialization function and a performance monitoring function of the basic speed matching device 200 and transmits the result to an optical management control unit (OMCU) of the optical terminal device (ONU) 122. Report or be controlled by this Management Control Unit (OMCU).

In this case, the plurality of basic speed matching devices 200 used for one optical terminal device (ONU) 122 may be individually selected into a DLC (Digital Loop Carrier) mode or an Integrated Digital Loop Carrier (IDLC) mode. .

First, the operation in the DLC mode and the IDLC mode of the basic speed matching device 200 will be described.

In the DLC mode, the basic speed matching device 200 receives a system clock of 4.096 MHz and a frame pulse signal from a frame processing unit (FRU), receives two lines of E1 data of 4.096 Mbps from the frame processing unit, and receives 3DS0 time division. One line of 2.01 Mbps E1 signal multiplexed by a modulation (TDM) method is extracted. In addition, 10 basic rate accesses are performed for each of 3 timeslots 3DS0 of the 30 allocated time slots among the extracted E1 signals. Bits 6 and 7 are transmitted transparently, and the maintenance channel bits (M bits: bits 5 of the signal channel) are processed by the main control unit 220 and transferred to the subscriber line matching unit 250.

At this time, the line assignment and time slot assignment of the IOM-2 bus 240 in the basic speed matching device are selected by the main control unit 220, and the data of the bearer channel 2B is pulse code modulation matching control unit 230. Through the subscriber line matching unit 250 is transmitted to each subscriber.

In IDLC mode, the basic speed matching device 200 selects E1 data of one line from one or more E1 line data consisting of only information signals in which a time slot exchange (TSI) function is performed in a frame processing unit (FRU). The data is processed and transmitted to the subscriber line matching unit 250 through the pulse code modulation matching control unit 230.

At this time, the maintenance channel bits (M bits) and the signal information bits (D bits) are set by the main control unit 220 in the data format of HDLC (High level Data Link Control) format from the optical control unit (OMCU). After receiving and processing it, it is transmitted to the subscriber line matching unit 250 through the IOM-2 bus 240.

On the other hand, the basic speed matching device 200 and the network termination device (NT: 132) is matched by the U-interface method.

Now, the function of each component of the basic speed matching device 200 of the present invention will be described in detail.

The signal matching unit 210 receives a 4.096 MHz clock, a frame clock, and a multiframe clock from a frame processing unit (FRU) of the optical terminator 122 and uses the same to transmit and receive data. At this time, one frame selects one piece of E1 data from a 2 line 4,096 Mbps signal from the frame processing unit (FRU), and the frame processor (FRU) inserts E1 data to be transmitted to one of the four lines. Send to the side.

More specifically, in DLC (Digital Loop Carrier) mode, 10 basic rate access (Basic Rate Access) are applied for 3 timeslots (3DS0 = 2B + D) for 30 timeslots for the selected E1 signal. Perform. At this time, 8-bit data of B1 byte, B2 byte, and 'xxxxxxDD' are transmitted to the pulse code modulation matching control unit 230. Here, the 'D' bits are bits used for data information as the 6th and 7th bits of the signal channel, and the 'x' bit is a Don't Care Condition.

In addition, the maintenance channel bit (M bit), which is the fifth bit of the signal channel, is extracted while maintaining synchronization, and is sent to the main controller 220. This maintenance channel bit (M bit) is then analyzed by the main control unit 220 and then sent to the subscriber line matching unit 250 via the IOM-2 bus 240.

The signal channel configuration of the 2B + D structure is shown in Table 1 below.

Beat number function One Activation request bit: 1 = disabled, 0 = enabled 2 Unused (set to 1) 3 Unused (set to 1) 4 Unused (set to 1) 5 Maintenance Channel Bit (M bit) 6 D Information (1'st bit) 7 D Information (2'nd bit) 8 Unused (set to 1)

On the other hand, in the down direction in the IDLC mode, one line corresponding to the mounting position of the basic speed matching device 200 among the E1 four-line data of only the information signal 2B of the time slot exchange (TSI) from the frame processing unit (FRU) is changed. The E1 data is selected and transmitted to the pulse code modulation matching controller 230 in units of B1 bytes and B2 bytes. At this time, the bits (D bits) for the signal information is input directly to the main control unit 220 from the management control unit (OMCU) of the optical termination device is processed and then subscriber line matching unit through the IOM-2 bus 240 Is passed to 250.

On the other hand, in the upward direction, the B1 byte and the B2 byte sent from the pulse code modulation matching control unit 230 are passed through the allocated time slot TS, and the signal information bits D1 and D2 are shifted by one bit, which is the original value. Pass to location. At this time, the main control unit 220 is a superframe unit defined in ITU-T G.961 in a predetermined register managed by the signal matching unit 210 for the data received through the subscriber line matching unit 250. The signal matching unit 210 loads the information (synchronization bit and holding channel bit) written in this register in the corresponding position of the signal channel in series.

The main control unit 220 monitors the alarm, performance, provision and test of the basic speed matching device 200, such as initializing the basic speed matching device 200 and allocating a time slot of the IOM-2 bus 240. It is executed under the control of the end-user's management control unit (OMCU), and the result is reported back to the management control unit (OMCU). Provision includes selecting one of a sealing current and a DLC / IDLC mode of a subscriber port, and performs HDLC communication with an OMCU.

The preferred main control unit 220 is configured using a microprocessor, and in this case, may be configured as a Motorola 'MC68302' microprocessor. In this case, the microprocessor 221 constituting the main controller 220 has a memory 222 to mount an operation program to be referred to. At this time, the memory 222 is composed of a ROM (ROM) for permanently storing a program to operate the basic speed matching device 200 and a RAM (RAM) for temporarily storing data generated during operation.

In the DLC mode, the main controller 220 analyzes and processes the maintenance channel bits (M bits) extracted by the signal matching unit 210, and monitors / controls data (Monitor, C / I: Command / Indication). The signal is sent to the pulse code modulation matching controller 230. In addition, in the upward direction, the data of the superframe unit received by the subscriber line matching unit 250 is written in the register of the signal matching unit 210, and the loop back is analyzed by analyzing the channel bit (M bit) for maintaining the received signal. It takes a, and sends the maintenance channel bit (M bit) generated by the logical AND to the signal matching section 210, and relays to the network side in a 3DS0 time division modulation (TDM) method.

In the IDLC mode, the main controller 220 exchanges signal information bit (D bit) and maintenance channel bit (M bit) information with the management control device (OMCU) of the optical terminator using HDLC communication. In addition, it receives a 2.048 MHz clock from an OMCU and uses it to transmit data. At this time, the basic speed matching device 200 operates in a slave mode with respect to the management control device (OMCU).

On the other hand, the main control unit 220 performs the performance and monitoring function of the basic speed matching device 200.

Performs a cyclic redundancy check (CRC) check on the signal received through the digital subscriber line (DSL) 251 (DSL) and monitors it, and outputs the performance monitoring value to the OMC of the optical termination device at regular intervals. do. In addition, the bit error ratio (BER) is measured and output to the management control unit (OMCU).

When the synchronization word of the multi-frame (ITU-T F961) received from the subscriber side is lost as an alarm monitoring function, the controller reports this to the management control unit (OMCU) and checks and reports the transmission delay of the transmission line.

3 is a structural diagram of an IOM-2 bus channel having a bus width of 32 bits.

At this time, 32 bits constituting one channel are 8 bits for B1 byte, 8 bits for B2 byte, 8 bits for monitor channel, 2 bits for signal information (D bit), 4 bits for C / I (Command / Indication) channel, receive M bits (MR), and transmit M bits (MX). At this time, the maintenance channel bits (M bits) are loaded directly to the IOM-2 bus 240 from the main control unit 220, and the signal information bits D1 and D2 among other information are pulse codes in the DLC mode. The modulation matching controller 230 is loaded on the IOM-2 bus 240, and in the IDLC mode, the main controller 220 is directly loaded on the IOM-2 bus 240.

The pulse code modulation matching control unit 230 performs a monitoring / control data (C / I and monitor) channel handling function. That is, the pulse code modulation matching controller 230 loads the B1 byte, B2 byte, and 'xxxxxxDD' data received from the signal matching unit 210 in the corresponding place of the IOM-2 bus 240, and monitor channel and C /. Data of the I (Command / Indication) channel is processed by the main controller 220 and transmitted to the pulse code modulation matching controller 230.

On the other hand, the maintenance channel bits (M bits) are loaded in the corresponding place of the IOM-2 bus 240 directly from the main control unit 220.

The maintenance channel bits (M bits) directed upward through the subscriber line matching unit 250 are extracted from the IOM-2 bus 240 to the main controller 220 and processed. The result is transmitted to the signal matching unit 210 in the DLC mode, and is transmitted from the main control unit 220 to the management control unit (OMCU) of the optical terminator using the HDLC communication function in the IDLC mode. At this time, the monitoring / control channel information (monitor channel information and C / I information) is extracted from the pulse code modulation matching control unit 230 and transmitted to the main control unit 220, and the result is managed by HDLC communication. It is passed to the device (OMCU).

The subscriber line matching unit 250 is connected to the pulse code modulation matching controller 230 and the IOM-2 bus 240, and may be controlled by the main controller 220 through the pulse code modulation matching controller 230. The subscriber line matching unit 250 transmits and receives information on a subscriber station network terminal (NT) and a superframe (Superframe: ITU-T G.961) unit, and uses a 2B1Q (2 Binary 1 Quaternary) transmission method. Basic Rate Accepts one or more subscriber lines.

In the upward direction, the basic speed matching device 200 carries the 2B + D structure subscriber data received from the network termination device NT of the subscriber station to the corresponding place of the IOM-2 bus 240 and is transparent to the signal matching unit 210. In this case, a series of measures such as loopback are taken by dividing the channel bit (M bit) for holding the digital subscriber line (DSL).

In the downward direction, B1 byte, B2 byte, and signal information bit (D bit) of the 3DS0 signal (2B + D) received from the IOM-2 bus 240 are transparently relayed to the network terminal NT of the subscriber station. The channel bit (M bit) for holding the EOC (Embedded Operation Channel) commands and indication signals received from the main controller 220 through the IOM-2 bus 240, or an indication signal generated by the main controller 220. Send with).

FIG. 5 is a loopback function diagram of the basic speed matching device, and a loopback function of the basic speed matching device 200 will be described with reference to the loopback function.

The subscriber line matching unit 250 receives 32-bit data (4DS0) from the IOM-2 bus 240, exchanges data with the subscriber in a superframe structure (ITU-T G.961), and maintains channel bits (M). Bit) to execute the loopback function.

That is, the main controller 220 analyzes the received maintenance channel bit (M bit), and then performs loopback by using an embedded operation channel (EOC) command. If the loopback at the point 200, the time slot of the signal matching unit 210 is controlled to loop back the E1-class signal received from the frame processing apparatus FRU to the power exchange side (LB1).

In addition, when the main control unit 220 sends the test loopback command of the basic speed matching device 200 itself to the subscriber line matching unit 250 through a command / indication (C / I) command, the subscriber line matching unit 250 may be configured to be used. By sending back the signal transmitted to itself, the main control unit 220 to test it (LB2).

On the other hand, if the main control unit 220 analyzes the received maintenance channel bit (M bit) and indicates a loopback in the subscriber network terminator NT, the network termination is performed using a monitor message. A command is sent to the device indicating this (LB3).

When the basic speed matching device 200 according to the present invention is used, the basic speed service of the integrated information communication network (ISDN) is provided to the subscriber connected to the optical terminator (ONU) 122 of the demand-dense optical subscriber transmission device 120. You will be able to deliver quickly.

Claims (2)

It is used in the demand-density optical subscriber transmission system to match the network terminal (NT) of the ISDN subscriber terminal with the E1 signal multiplexed with the basic speed (2B + D) data of the integrated IT network. In the basic speed matching device, the E1 signal is received and separated into two bearer channels (B) and signal channels (D), and the channel bit for maintenance (M bit) and the signal information bit (D bit) of the signal channel are provided. A signal matching unit performing a function of extracting C) and a reverse function thereof; A data bus that carries digital data; Depending on the operation mode, a relay between the maintenance channel bit (M bit) extracted from the signal matching unit and the maintenance channel bit (M bit) loaded on the data bus or received from an external device of the basic speed matching device. Relay channel bits (M bits) and signal information bits (D bits) and the holding channel bits (M bits) and signal information bits (D bits) carried on the data bus, A main controller for analyzing (M bits) and outputting monitor and command / indication data; Under control of the main control unit, a pulse code for connecting two separate bearer channels (B), a signal channel (D) port, and a monitoring / control signal channel of the main control unit with a corresponding place of the data bus A modulation matching controller; And And a subscriber line matching unit connected to the data bus and exchanging bearer channel (B), signal channel (D), and maintenance channel bit (M bit) information with the network termination device NT of the subscriber-side terminal. A basic speed matching device of an integrated information communication network in a demand-density optical subscriber transmission device. According to claim 1, wherein the main control unit is configured using one microprocessor, ROM (ROM) for storing the operating program of the microprocessor, and RAM for temporarily storing data generated during the operation of the microprocessor ( And a basic speed matching device of an integrated information communication network in a demand-density optical subscriber transmission device, characterized in that it comprises a RAM.