KR20000046393A - Apparatus for controlling public switched telephone network interface unit in fiber loop carrier-curb system - Google Patents

Abstract

PURPOSE: An apparatus for controlling the PSTN(Public Switched Telephone Network) interface unit in the FLC-C(Fiber Loop Carrier-Curb) system is provided to control the PSTN interface unit to carry out the function between the PSTN and the FLC-C system. CONSTITUTION: Decoding the address signal of a central processing unit(362), an address decoder(351) supplies it to each of the components of a PSTN interface unit as a chip selection signal. A buffer processing unit(352) carries out a buffering function for data address signals, data bus signals and read/write signals. A register unit(353) provides interface means with the central processing unit(362). A multiplexing/demultiplexing unit(354) multiplexes ATM cells outputted from an ATM cell processing unit(320) to transmit to a cell bus connection unit(340) and demultiplexes cells outputted from the cell bus connection unit(340) to transmit to the ATM cell processing unit(320). A performance monitoring unit(355) collects performance monitoring information, counting code violation signals.

Description

A control unit of Public Switched Telephone Network Interface unit in Fiber Loop Carrier-Curb systems

The present invention relates to a control device of a public telephone network matching unit in a demand dense optical subscriber transmission device, and in particular, a host digital of a demand dense optical subscriber transmission device (hereinafter referred to as a Fiber Loop Carrier-Curb System). The present invention relates to an apparatus for controlling a public telephone network matching unit mounted on a terminal (HDT) and performing a matching function between a public switched telephone network (PSTN) and an FLC-C system.

Conventionally, as the use of voice information and a computer has become common, an integrated services digital network (ISDN) using a digital communication method has been proposed and used as a method of integrating and communicating data information. Although coaxial cable has been used, coaxial cable has a problem in that it is not possible to secure a bandwidth required for high-speed data communication or image information communication, which is rapidly expanding demand.

As a solution to this problem, optical communication methods have been devised and used, and optical communication networks have been extended to all sections of the communication section. A device that realizes this is a demand dense optical subscriber transmission device.

1 is a block diagram of a demand-intensive optical subscriber transmission apparatus 200, the demand-intensive optical subscriber transmission apparatus 200 is a service transmission platform of the FTTC (Fiber To The Curb) method, home-shopping, games, movies The service providers 130 that provide various services, such as the host digital terminal 210 and the optical termination device 220, which constitute the ATM switch 100 and the demand dense optical subscriber transmitter 200. Network service) to provide subscribers 140 with a video service.

Here, the host digital terminal (HDT: 210), which is a component of the demand-density optical subscriber transmitter 200, is a device installed in a telephone station, and is asynchronously transmitted through the ATM switch 100 from the DS1 and DS1E signals and the broadband switching network. Asynchronous transfer mode (ATM) -based broadband signals are connected, integrated-multiplexed into a synchronous digital hierarchy, and then optically transmitted to the ONU 220, a power device, and vice versa.

The host digital terminal (HDT: 210) includes two ATM transmit / receive units (211: ATM Transmit Receive Units), an ATM cell bus (213), an optical transmit / receive unit (212), and a public transmit / receive unit (212). It is composed of a public telephone network matching unit 214, a main control unit (215), etc., connected to a telephone network (PSTN) to exchange DS1E level signals.

Here, two ATM transmitting / receiving units 211 are mounted at one host digital terminal (HDT) 210, and four synchronous transport module signals (STM-1: Synchronous) each having a transmission rate of 155.52 Mbps from the ATM switch 100. After receiving the Transport Module-1 and processing the overhead included in the synchronous transport module signal STM-1, the ATM cell is extracted and sent to the ATM cell bus 213 or vice versa. That is, the ATM transceiver unit 211 has four STM-1 ports.

The optical transmission / reception unit 212 is composed of eight, and one optical transmission / reception unit 212 is connected to two optical termination units 220 (ONU), thereby connecting a total of 16 optical termination units (ONU). The optical transmission / reception unit 212 receives ATM cells through the ATM cell bus 213 to make an STM-4 class optical signal (622.08Mbps) and transmits the same to the optical end device (ONU) and its reverse function. .

The public telephone network matching unit 214 receives a DS1E signal having a transmission rate of 2.048 Mbps from a public switched telephone network (PSTN), maps it to an ATM payload space, and then transmits and receives optical signals through an ATM cell bus 213. Sends to unit 212 and vice versa.

The Main Control Unit (215) is an Operation Administration and Maintenance Cell (hereinafter referred to as an OAM cell) to be processed by itself among ATM cells through the ATM cell bus 213. It receives and processes the data, and performs overall control of the host digital terminal (HDT: 210) by performing inter-processor communication (IPC) with the units constituting the host digital terminal.

In addition, the optical termination unit 220 (ONU) is installed in a distribution center in a dense residential area such as an apartment complex to separate the subscriber signal from the STM-4 class optical signal received from the host digital terminal (HDT: 210) according to the service. It is a device that performs the function provided to each subscriber and its reverse function.

Meanwhile, as described above, the public telephone network matching unit 214 receives a DS1E signal having a data rate of 2.048 Mbps from the public telephone network 110 (PSTN), maps it to the ATM payload space, and then maps the ATM cell bus 213. A unit that performs the function of sending to the optical transmission / reception unit 212 and its reverse function. To perform such a function, a line connection unit which is connected to the E1 line and inputs and outputs an E1 signal, and the ATM cell is connected to the ATM cell bus 213. And a cell bus connection unit for inputting and outputting a cell, an ATM cell processing unit for converting an E1 signal and an ATM cell between a line connection unit, and a cell bus connection unit, and a central processing unit for controlling the public telephone network matching unit 214.

Therefore, a public telephone network matching unit needs a control device that operates between these components to effectively control the public telephone network matching unit.

Accordingly, the present invention has been made in order to meet the above necessity, a line connection part that connects to a public telephone network (PSTN) through an E1 line to exchange a predetermined number of E1 data, and an E1 signal received from the E1 line through a line connection part. ATM cell processing unit that converts the ATM cell header into an asynchronous transmission mode cell (ATM cell), or sends an ATM cell received from the cell bus connection to an E1 signal to the line connection, and converts the header of the ATM cell using externally stored routing information. The cell bus connection that accepts the cell and then sends it to the ATM cell bus, or if the routing header value of the ATM cell received from the ATM cell bus matches the cell bus address assigned to it, and the central processing that controls each component. To provide a device for efficiently controlling the public telephone network matching unit of the demand-density optical subscriber transmission device including the device There is a purpose.

In order to achieve the above object, the control device of the public telephone network matching unit in the demand-density optical subscriber transmission device according to the present invention decodes the address signal of the central processing unit, each of the public telephone network matching device An address decoder which supplies a component as a chip select signal (CS); Performs a buffering function for data exchanged with a main control unit (MCU) that manages a host digital terminal of the demand dense optical subscriber transmitter, an address bus signal, a data bus signal, and a bus read / write signal of the central processing unit. A buffer processing unit; A register unit providing interface means with the central processing unit by temporarily storing predetermined alarm state and loopback state information appearing on the operation of the public telephone network matching unit; A multiplexer / demultiplexer for multiplexing ATM cells from the ATM cell processor through a UTOPIA interface and transmitting them to a cell bus connection, and demultiplexing cells transmitted from the cell bus connection to an ATM cell processor; A performance monitoring unit for collecting performance information by counting a Code Violation (CV) state occurring at the line connection unit; An uplink alarm display signal generation unit for generating an alarm display signal (AIS) and transmitting the generated alarm display signal (AIS) to the cell bus connection unit when an error state or a loopback state occurs according to a predetermined rule in a signal input through the line connection unit; And a clock divider for supplying a clock necessary for the line connection unit by using an oscillator (oscillator).

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

2 is a configuration diagram of a public telephone network matching device to which the present invention is applied;

3 is a block diagram of a control device according to the present invention.

* Explanation of symbols for main parts of the drawings

110: public telephone network (PSTN) 200: demand dense optical subscriber transmission device

210: host digital terminal (HDT) 220: optical terminator (ONU)

213: ATM cell bus 214: public telephone network matching unit

215: main control unit (MCU) 310: line connection

320: ATM cell processing unit 330: SRAM

340: cell bus connection 350: controller

361: processor to processor communication processor 362: central processing unit (CPU)

363: ROM 364: RAM

365: clock generator 366: serial channel unit

370: power supply 351: address decoder

352: buffer processing section 353: register section

354: multiplexing / demultiplexing unit 355: performance monitoring unit

356: upward alarm display signal generator 357: clock divider

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

2 is a configuration diagram of a public telephone network matching device 214 to which the present invention is applied, and includes a line connection unit 310, an ATM cell processing unit 320, a cell bus connection unit 340, an interprocessor communication processing unit 361, and a central processing unit. Device 362, ROM 363: ROM, RAM 364: clock generator 365, serial channel 366, power supply 370, and control device 350 according to the present invention. Is done.

First, the function of each component will be described.

The line connection unit 310 receives the E1 data from the public telephone network 110, recovers the clock, recovers the received data, and declares it according to whether a Loss Of signal (LOS) occurs in the received data. Or release it. In addition, it performs a loopback function so as to check the communication state to the line connection unit 310, and performs a function of attenuating jitter of the received data.

The ATM cell processing unit 320 converts the DS1E signal received by the line connection unit 310 through the E1 line into an ATM cell and sends it to the cell bus connection unit 340, or sends an ATM cell to the cell bus connection unit 340 to the DS1E signal. To make a function to send to the line connecting portion 310. In addition, it performs a loopback function to check the communication state to the ATM cell processing unit 320.

The cell bus connection unit 340 uses the routing information stored in the SRAM 330 to output a virtual path identifier (VPI) and a virtual channel identifier (VCI) of the ATM cell output from the ATM cell processing unit 320. The routing header according to the Virtual Channel Identifier) value is added to the ATM cell header and transmitted to the ATM cell bus 213. In addition, if the routing header value of the ATM cell received from the ATM cell bus 213 matches its own address, the cell receives the cell and transmits the cell to the ATM cell processor 320.

The interprocessor communication processor 361 performs inter-processor communication (IPC) with another processor, and the serial channel unit 366 is connected with an operation terminal so that the central processing unit 362 is connected in series. It provides a means for reporting the status of the public telephone network matching device 214 by.

The ROM 363: ROM stores driving programs of the public telephone network matching device 214, and the RAM 364: RAM stores data generated when the public telephone network matching device 214 is driven together with the ROM 363. Temporarily save.

The clock generator 365 provides a clock required for the public telephone network matching device 214, and the power supply 370 supplies power (for example, +3.3 V and +5 V) used in the public telephone network matching device 214. Or detect a power failure.

3 is a block diagram of a control device 350 according to the present invention, which includes an address decoder 351, a buffer processing unit 352, a register unit 353, a multiplexing / demultiplexing unit 354, and a performance monitoring unit 355. And an uplink alarm display signal generation unit 356 and a clock divider unit 357, and among the central processing unit 362, the ATM cell processing unit 320, and the cell bus connection unit 340. Perform the control function of (214).

The address decoder 351 decodes an address signal of the central processing unit 362, supplies the components of the public telephone network matching unit 214 as a chip select signal (CS), and supplies a DSACK (Data). Strobe Acknowledge) Generates a signal.

That is, from the CPU 362, the corresponding address signal, address strobe signal (AS: address strobe), data strobe signal (DS: data strobe), bus read / write signal (WR: read / write), reset signal (RESET) And a processor clock signal to decode and generate a signal for selecting the register unit 353, the RAM 373, the ROM 372, and the like.

The buffer processor 352 performs a buffering function for data, an address bus signal, a data bus signal, and read / write signals to and from the main controller 215 (MCU) of the host digital terminal 210.

The register unit 353 temporarily stores predetermined alarm state and loopback state information appearing on the operation of the public telephone network matching unit 214 to provide an interface means with the central processing unit 362.

That is, the signal loss state (LOS) declared at the line connection unit 310, the 3.3 volt power failure state (Power Fail), the error state of the driving clock supplied from the clock generator 365, the air in which the apparatus of the present invention is used. Control elements such as a unit slot identification number of the telephone network matching device 214, unit version display information, information for distinguishing each interrupt source, and loopback status information instructed by the central processing unit 362.

The loopback function of the line connection unit 310 or the ATM cell processing unit 320 described above is performed by referring to the loopback state information recorded in the corresponding place of the register unit 353. In addition, when a signal loss state (LOS) occurs in the line connection unit 310, this fact is notified to the corresponding place of the register unit 353, and the central processing unit 362 reads this value to determine the current signal loss state (LOS). You can see that is happening.

The multiplexer / demultiplexer 354 multiplexes the ATM cells coming from the ATM cell processor 320 through the UTOPIA interface to the cell bus connector 340, and decodes the cells sent from the cell bus connector 340. Multiplexing is performed to transmit to the ATM cell processing unit 320.

Specifically, the multiplexing / demultiplexing unit 354 multiplexes the ATM cells coming from the ATM cell processing unit 320 and transmits the cells to be transmitted to the cell bus connection unit 340 by the ATM cell processing unit 320. And if the cell bus connection 340 is ready to receive the cell, it sends a corresponding signal to the ATM cell processing unit 320 so that the ATM cell processing unit 320 initiates cell transmission.

In addition, for the function of demultiplexing the ATM cells from the cell bus connector 340 and transmitting them to the ATM cell processor 320, it is monitored whether the cell bus connector 340 has cells to transmit, and the ATM cell processor 320 Is ready to receive the cell, it sends a corresponding signal to the cell bus connection 340 to allow the cell bus connection 340 to initiate cell transmission.

The performance monitoring unit 355 collects Performance Monitoring (PM) information by counting a Code Violation (CV) signal generated by the line connection unit 310. The counted number is recorded in the corresponding place of the register unit 353 so that the CPU 362 can refer to it.

The uplink alarm display signal generation unit 356 may notify the power station by sending an alarm display signal AIS to the cell bus connection unit 340 when the input signal is in a signal loss state (LOS) or in a loopback state. To make sure.

The clock divider 357 divides and supplies a clock (eg, 2.048Mhz / 4.096Mhz) required by the line connection unit 310 by using a clock supplied from the clock generator 365.

The present invention is mounted on the host digital terminal (HDT) of the demand-dense optical loop carrier-Curb System, the public telephone network matching to perform the matching function of the E1 signal between the public telephone network (PSTN) Since it can be generally used in the unit 214, it provides a useful means for matching the demand-density optical subscriber transmission device to the public telephone network.

Claims (1)

A line connection part that connects to a public telephone network (PSTN) through an E1 line to exchange a predetermined number of E1 data, and makes an E1 signal received from the E1 line through the line connection into an asynchronous transmission mode cell (ATM cell), or ATM cell processing unit which sends ATM cell received from bus connection to E1 signal to the line connection, converts header of ATM cell using routing information stored externally and transmits it to ATM cell bus, or from ATM cell bus If the routing header value of the received ATM cell matches the cell bus address assigned to it, a demand-density optical subscriber transmission comprising a cell bus connection to accept the cell and a central processing unit controlling each of the components A device for controlling a public telephone network matching unit of a device, An address decoder which decodes an address signal of the central processing unit and supplies each component of the public telephone network matching unit as a chip select signal (CS); Performs a buffering function for data exchanged with a main control unit (MCU) that manages a host digital terminal of the demand dense optical subscriber transmitter, an address bus signal, a data bus signal, and a bus read / write signal of the central processing unit. A buffer processing unit; A register unit providing interface means with the central processing unit 362 by temporarily storing alarm state and loopback state information appearing in the operation of the public telephone network matching unit; A multiplexer / demultiplexer for multiplexing ATM cells from the ATM cell processor through a UTOPIA interface and transmitting them to a cell bus connection, and demultiplexing cells transmitted from the cell bus connection to an ATM cell processor; A performance monitoring unit for collecting performance information by counting a Code Violation (CV) state occurring at the line connection unit; An uplink alarm display signal generation unit generating an alarm display signal (AIS) and transmitting the generated alarm display signal (AIS) to the cell bus connection unit when an error state or a loopback state occurs in a signal input through the line connection unit; And And a clock divider for supplying a required clock to the line connection unit by using an oscillator (oscillator).