KR101484267B1 - Optical Network Termination with detect error, reset, power off, and storing the information - Google Patents

Abstract

The optical communication terminal apparatus having the fault detection / restoration / blocking and information storage function of the present invention includes an uplink for performing a communication function with an upper system, a communication port for distributing or integrating the communication, And a system power supply for supplying power to the uplink, the communication port, and the CPU, wherein the uplink includes: an optical module for performing optical communication with the upper system; And a failure detection / recovery / blocking module for detecting the optical output of the optical module outside the MAC module, restoring the failure, and blocking the optical output. According to the present invention, it is possible to solve a fast and accurate failure through a low-cost microprocessor and its storage medium.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical network terminal,

The present invention relates to an optical communication terminal device having a fault detection / recovery / blocking function and an information storing function. In particular, when optical output of an optical module continuously occurs and one ONT interrupts Internet service of another ONT, The present invention relates to an optical communication terminal device which detects abnormal light output by only a microprocessor installed in the optical module, cuts off the power of the optical module, stores the information in a storage medium, and further displays it on the outside.

2. Description of the Related Art A passive optical network (hereinafter, referred to as " ONT ") is generally composed of an optical line termination (OLT) and a plurality of optical communication terminals (Optical Network Terminals) Hereinafter, referred to as PON), a plurality of ONTs can transmit optical signals, i.e., upstream data only at a time allocated to the ONTs in the OLT.

If at least one ONT among a plurality of ONTs transmits an optical signal outside the time allocated to the ONT or transmits the optical signal to the OLT beyond the time allocated to the ONT, A collision may occur and the whole network may become incommunicable.

Hereinafter, a case where a failure occurs in the entire network when a failure occurs in one ONT in the related art will be described.

As shown in FIG. 1A, the PON system 2 is an optical subscriber establishing system that provides optical fiber-based high-speed services to an enterprise or a general household. The PON system 2 includes a splitter 20 To allow a plurality of ONTs 30-1 to 30-n to be connected to each other.

The PON system 2 includes a TDM-PON using a TDM (Time Division Multiplexing) method and a WDM-PON using a WDM (Wavelength Division Multiplexing) method. The PON system 10 of the time division multiplexing system includes an ATM-PON that uses an asynchronous transfer mode (ATM), an Ethernet-based E-PON, and a G-PON that uses a general frame protocol.

The operation of the PON system 2 using the time division multiplexing method is as follows. In the downstream case where data is transferred from the OLT 10 to the ONTs 30-1 to 30-n, the identifier of the ONTs 30-1 to 30-n to which the OLT 10 is registered is inserted into the preamble of the frame And ONTs 30-1 to 30-n receive only frames having their own identifiers.

1B, in the case of an upstream in which data is transmitted from the ONTs 30-1 to 30-n to the OLT 10, when the OLT 10 is connected to all the ONTs 30-1 to 30-n, , And each ONT 30-1 to 30-n can transmit data to the OLT 10 only during the time slot assigned to it.

In the upstream process as described above, when a failure occurs in the ONT 10 and the laser diode continuously emits light as shown in FIG. 1C, the ONT 30-1 in which the failure occurs is the upstream time Not only makes it impossible for the other ONTs 30-2 to transmit data to the OLT 10 while taking over the entire slot, but also allows the ONTs 30-2 to 30-n, It may cause a problem that it is determined that an accurate response is not made.

Therefore, the present invention can prevent the PON system 2 from being turned on by quickly detecting that the laser diode is continuously emitting light due to the failure of the ONT 30 and shutting down the optical module of the ONT 30, So that it can be operated smoothly.

The ONT 30 may include an optical transmission module 32, a light reception module 34, and a control unit 36. [

The optical transmitter module 32 transmits the optical signal to the OLT 10 in response to a command from the controller 36. The optical transmission module 32 may include a laser diode for outputting an optical signal and a laser driver for driving the laser diode. The light receiving module 34 receives the optical signal from the OLT 10. The light receiving module 34 may be implemented as one module together with the optical transmitting module 32. The control unit 36 may perform a function of blocking the optical transmission module 32 when there is an optical signal transmission stop command from the OLT 10. [

The OLT 10 may include an optical transmission module 12, a light reception module 14, and a control unit 16. [

The light receiving module 12 receives an optical signal from a plurality of ONUs 30. The light receiving module 12 may include a photodiode for receiving an optical signal and converting the optical signal into an electrical signal, and an amplifier for amplifying the converted electrical signal. The control unit 16 provides the transmitted data and the optical activation signal to the optical transmission module 12 or receives the photoelectric conversion data of the optical signal received by the optical reception module 14 from the optical reception module 14 And controls the OLT 10 as a whole.

The control unit 16 may further include a Recieved Signal Strength Indicator (RSSI) 16a and a failure determination unit 16b.

The RSSI 16a detects the received signal strength of the received optical signal. The failure determination unit 16b determines whether or not the abnormal ONT 30-1 has occurred. The failure determination unit 16b determines that the optical power level detected by the RSSI 16a does not exceed the reference value, and determines that the optical power level is abnormal if the optical power level exceeds the reference value.

If the optical power level is a set of optical signal intensities of the ONTs 30-1 to 30-n sharing the same optical line as that of the OLT 10, And the optical power level generated when the optical transmitter module 32 emits light. That is, the steady state maintains the received optical power level equal to the reference value when no abnormality occurs in the ONT 30-1. However, if an abnormality occurs in the ONT 30-1, The received optical power level is inevitably larger than the reference value.

When the failure determination unit 16b detects a failure, the failure determination unit 16b transmits a failure message to the ONT 30-1 through the optical transmission module 12 to resolve the failure. Each ONT 30 corresponding to the ONT 30 includes a Transmitted Signal Strength Indicator (TSSI).

As described above, an optical module showing a continuous optical output state through a TSSI signal has been introduced, but the cost of the equipment installed in the host system and each subsystem is high, which causes the overall cost increase. In addition, the number of occurrences is stored or blocked only without attempting recovery. There is no function to store the number of faults such as hang-up, overvoltage, etc. of the so-called PON MAC chip, so the cause of the fault can not be grasped and it is difficult to deal with the fault quickly.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an optical communication terminal device which is capable of preventing abnormal optical output, hang-up of a PON MAC chip, The present invention also provides an optical communication terminal device that automatically detects an error in a configuration setting value of an Internet network and attempts to recover it, and permanently blocks the Internet network from causing a failure if the failure is not solved.

Another object of the present invention is to store the number of times of overvoltage applied to the terminal, the number of times of power on / off (On / Off), the number of abnormal optical output, the number of hangups of the PON MAC chip, To identify the installation environment and operating habits of the terminal device, and to provide a light communication terminal device that satisfies the customer's desire through faster trouble handling and troubleshooting.

According to an aspect of the present invention for achieving the above-mentioned object, the present invention provides a method for managing an uplink, a communication port for distributing or integrating the communication, And a system power supply for supplying power to the uplink, the communication port, and the CPU, wherein the uplink includes: an optical module for performing optical communication with the upper system; And a failure detection / recovery / blocking module for detecting the optical output of the optical module outside the MAC module, restoring the failure, and blocking the optical output.

As described above, according to the configuration of the present invention, the following effects can be expected.

First, it is economical to solve the problem of the optical communication terminal device by using a microprocessor dedicated for low-cost failure detection / recovery / interception without using expensive equipment such as RSSI / TSSI.

Secondly, by storing failure information such as the number of continuous abnormal light output times, the number of hang-ups of the MAC module, and the number of times of overvoltage applied to the optical communication terminal device by using a storage medium inside or outside of the microprocessor, Accurate recovery is possible.

1A and 1B are block diagrams showing the configuration and function of a conventional PON system.
2 is a block diagram showing the configuration of a PON system according to the present invention;
3 is a block diagram showing a configuration of an optical communication terminal apparatus according to the present invention;

Brief Description of the Drawings The advantages and features of the present invention, and how to achieve them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. The dimensions and relative sizes of layers and regions in the figures may be exaggerated for clarity of illustration. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an optical communication terminal apparatus and a PON system including the same will be described in detail with reference to the accompanying drawings. do.

In a typical PON system, when a failure occurs in a PON MAC chip that is responsible for communication of a terminal, or when an optical module fails and continuous abnormal light is output, all the optical communication terminal devices connected to one optical line are connected to the Internet service A fault condition can not be generated.

It is determined that there is no function of automatically detecting the continuous light output state in the optical communication terminal device currently in service. In order to solve the problem that the Internet service of all the terminals connected to the optical line is not performed in the present invention, The user wants to solve the problem by easily finding the terminal that generates the failure.

 2, the PON system 100 of the present invention includes one optical line termination (OLT) 110 corresponding to an upper system, a plurality of optical signals corresponding to a subsystem An optical network unit (hereinafter, referred to as ONT) 120, and an optical distribution network (hereinafter, referred to as " ONUs ") that allow the one OLT 110 to connect with a plurality of ONTs 120 (Hereinafter referred to as " ODN ") 130.

The PON system 100 uses a passive distributor or a wavelength division multiplexing device between a subscriber access node such as an FTTH network or a Fiber To The Curb and a network terminal, You can configure a network in the form of a bus or tree structure. The PON system 100 of the present invention may have the form of an APON (ATM: Asynchronous Transfer Mode, PON) or an EPON (Ethernet PON) or a GPON (Gigabit PON).

According to the embodiment of the present invention, the PON system 100 is not limited to the FTTH network but can be interpreted in a broad sense including an HFC network. For example, when a HFC (Hybrid Fiber Coaxial) network that performs CATV broadcasting and Internet communication is used, broadcasting and data from the head end (H / E) of the upper system can be transmitted to the modem of the wired subscriber corresponding to the subsystem have.

Referring to FIG. 3, the ONT 120 may include an uplink 200, a CPU 300, a communication port 400, and a system power source 500.

The uplink 200 is in communication with the OLT 110, which is an upper system.

The communication port 400 distributes or integrates the communication under the control of the CPU 300. [ For example, it is intended to implement a wired Ethernet connection for each office or house so that an Ethernet cable can be connected to the office or home (or to each desk or each room). The communication port 400 may be composed of two, four, or eight.

The CPU 300 manages the distribution and integration of the communication. The central processing unit of the ONT 120 is responsible for managing and controlling each module in the ONT 120. In particular, the ONT 120 manages and controls each module in the ONT 120, Network state management and data transmission time adjustment for communication.

The system power supply 500 supplies power to the ONT 120. [ That is, the power is supplied to the uplink 200, the communication port 400, and the CPU 300 using an adapter. In particular, the power can be turned on / off according to a signal from a microprocessor to be described later (for example, a power supply initialization signal).

The uplink 200 includes an optical module 210 for performing optical communication with the OLT 110, a MAC module 220 for controlling optical communication with the OLT 110, and a MAC module 220, And a failure detection / recovery / blocking module 230 that detects the optical output of the module 210, restores the failure, and blocks the optical output.

The optical module 210 performs optical communication using the optical transmission TX power source 212 and the optical reception RX power source 214. The optical transmission TX power supply 212 E / O converts the electric signal into an optical signal. The light reception RX power supply 214 O / E converts the optical signal into an electric signal.

The MAC module 220 manages optical communication by controlling the optical output of the optical module 210. For example, when each ONT 120 performs data communication with the OLT 110, an up-stream time slot can be allocated to avoid duplication of uplink data.

The failure detection / recovery / blocking module 230 determines the operation state of the optical module 210 with the output voltage of the voltage detection sensor resistor 232 connected to the optical module 210 and the voltage detection sensor resistance 232 / RTI > microprocessor 234, which may be coupled to the system bus 238. The < RTI ID = 0.0 > For example, the output voltage of the voltage sense resistor 232 may be coupled to the ADC pin of the microprocessor 234 and output.

The uplink 200 includes a power control logic 222 that is installed inside or outside the MAC module 220. Or the power control logic 222 may be provided in the CPU 300 outside the uplink 200 to control the power supply of the optical module 210. [

The power control logic 222 controls the current applied to the TX power supply 212 and the RX power supply 214 in a circuitous manner. There is no change in the sensor output voltage in a steady state when a constant current (e.g., 100mA) is applied from the power control logic 222 to the TX power supply 212, but when the current applied to the TX power supply 212 increases , 200 mA). Since the resistance value is constant but the current value increases, a voltage drop occurs due to the voltage sensor resistance 232, and a change occurs in the sensor output voltage.

When the sensor output voltage is measured at a low level in the microprocessor 234, it is possible to grasp the continuous optical output state and to control the power supply control logic 222 to recover the failure of the optical module 210. To restore a continuous light output state, the power control logic 222 is controlled to perform a reset of the TX power supply 212. Subsequently, when the failure of the optical module 210 is not restored and a failure occurs repeatedly at predetermined intervals, and continuous optical output continues despite the reset (Off / On), the power control logic 222 is controlled to permanently The TX power of the optical module 210 can be shut down to fundamentally block the failure.

At this time, an LED or other display device (not shown) may be installed on the uplink 200 to indicate a permanent power-off state of the optical module 210 for quick recovery. For example, the display device may be installed outside the uplink 200 of the PON system 100 or outside the ONT 120.

≪ Embodiment 2 >

MAC  Of the module Hangup ( Hang - up Status detection, recovery ( reset ), And blocking Off ) function

The L2 switch or the ONT 120 located at the subscriber side as a subsystem of the PON system 100 can not operate the function of the MAC module 220 due to a defect in the internal switch S / This can be hang-up. When the MAC module 220 hangs up, the subscriber service becomes impossible.

The microprocessor 234 detects and restores the hang-up state of the MAC module 220, which is one of the obstacles to the optical communication terminal apparatus. A hang-up state can be detected through a serial interface (e.g., UART, I2C, etc.) between the MAC module 220 and the microprocessor 234. [ If a hang-up condition is detected, the microprocessor 234 may be able to either permanently reset the system power supply 500 by, for example, resetting a fault by hardware reset or performing an off / Can be blocked.

For example, the UART interface (I / F) allows the microprocessor 234 to monitor the outage of the MAC module 220 and to perform reporting and management functions at the outage.

In this case, for quick recovery, hardware initialization or power off / on reboot status can be displayed through LED or other display device.

≪ 3 Examples &

Identification and initialization of configuration setting error of optical communication terminal device

When the configuration setting value is broken, the optical communication terminal apparatus is not connected to the optical link and can not provide the Internet service. The microprocessor 234 detects the optical signal as a signal loss warning (LOS) signal of the optical module 210 and if the optical link is not connected for a certain time, Initializes the configuration values of the MAC module 220, and performs hardware reset of the terminal.

<Example 4>

Overvoltage detection function

The microprocessor 234 measures the voltage level of the voltage input to the optical communication terminal device through the ADC pin. When the ADC value becomes a specific value or more, the microprocessor 234 recognizes the overvoltage applied state and displays the state with the LED.

When the TSSI / RSSI is used to measure the voltage level, the ONT 120 receives the optical power level of the ONT 120 from the RSSI of the OLT 110. When the received optical power level exceeds the reference value, The OLT 110 is provided with the RSSI and the ONT 120 is provided with the TSSI. This causes a rise in the overall cost.

Therefore, in the present invention, when the overvoltage state of the terminal is measured by using the microprocessor 234 dedicated to fault detection / restoration / interruption, the fault can be easily detected and solved at the terminal level.

&Lt; 5 Embodiment &

Power-off and power failure detection

The microprocessor 234 measures the voltage input to the optical communication terminal device, that is, the ONT 120, through the ADC pin, and when the ADC value becomes a specific value or less, the microprocessor 234 recognizes the power failure and the system power supply 500 as OFF And sends a power fail signal to the MAC module 220 to send a Dying GASP message.

&Lt; 6 Embodiment &

Remote reset function

The MAC module 220 interprets the remote reset command through the OAM message and connects the GPIO pin of the MAC module 220 to the microprocessor 234 and the microprocessor 234 performs hardware reset Or performs power on / off (Off / On).

&Lt; Seventh Embodiment &

Storing the number of occurrences for each failure cause

The microprocessor 234 detects the main cause and obstacle of the optical communication terminal device or the ONT 120 by using the microprocessor 234 and the microprocessor 234 can detect the presence or absence of a flash or DDR or EEPROM, (238). When a user requests repair, the cause can be analyzed and repaired more quickly, and the quality can be improved by eliminating the cause of the failure by analyzing the installation environment.

The cause of failure and the items of failure stored in the storage medium 238 as described above are as follows.

A) Number of consecutive unsteady light outputs

B) The number of MAC-module hang-ups

C) the number of times of overvoltage applied to the optical communication terminal device

D) Number of Power Off / On

E. Number of configuration settings initialization

F) Number of remote reset

As described above, according to the present invention, it is possible to implement a function of detecting failure of the optical communication terminal device using a low-cost microprocessor 234, attempting recovery, and preventing a failure in the Internet network if recovery is not possible have.

In addition, by storing the cause of failure and the frequency of occurrence of the failure, it is possible to improve the reliability of the customer through faster failure recovery and repair by analyzing the environment where the optical communication terminal device is installed and the operating habits of the user's optical communication terminal device.

As described above, it is understood that the present invention is based on the technical idea of a configuration of an optical network terminal device having an independent fault detection / restoration / interception and information storage function. Many other modifications will be possible to those skilled in the art, within the scope of the basic technical idea of the present invention.

100: PON system 110: OLT
120: ONT 130: ODN
200: uplink 210: optical module
212: TX power 214: RX power
220: MAC module 222: power control logic
230: Fault detection / recovery / blocking module 232: Voltage detection sensor resistance
234: Microprocessor 238: Storage medium
300: CPU 400: communication port
500: System Power

Claims (11)

An uplink for communicating with an upper system;
A communication port for distributing or integrating the communication;
A CPU for managing distribution and integration of the communication; And
A system power supply for supplying power to the uplink, the communication port, and the CPU; / RTI &gt;
The uplink includes:
An optical module for performing optical communication with the host system;
A MAC module for controlling optical communication with the upper system; and
A failure detection / recovery / blocking module for detecting the optical output of the optical module outside the MAC module, for restoring the failure, and for blocking the optical output; / RTI &gt;
The fault detection / recovery /
A voltage sensing sensor resistor serially connected to the optical module; And
A fault detection / recovery / shutdown microprocessor connected to the ADC pin for determining an operation state of the optical module directly from an output voltage of the voltage detection sensor resistor; / RTI &gt;
And power control logic for controlling the current applied to the optical module in a circuit manner,
Since the resistance of the voltage sensing sensor is connected between the power control logic and the optical module, when the current applied from the power control logic to the optical module increases, the resistance of the voltage sensing sensor is constant, The output voltage drop of the resistor occurs,
Wherein the microprocessor determines that the output voltage drop occurs in an abnormal continuous optical output state and turns off the power of the optical module by controlling the power control logic. And a storage function. delete delete delete The method according to claim 1,
The microprocessor controls the power control logic,
The failure of the optical module is primarily restored through a reset,
If the continuous optical output state continues, the power of the optical module is permanently cut off,
The optical communication terminal device according to claim 1, further comprising an LED for indicating a cut-off state of the optical module power source outside the uplink. The method according to claim 1,
The fault detection / recovery /
And a failure detection / recovery / interception microprocessor for performing a serial interface with the MAC module,
Wherein the microprocessor detects a hang-up state of the MAC module through the serial interface. The method according to claim 6,
Wherein the microprocessor performs a hardware control of the MAC module when it detects a hang-up state, and initializes the system module and permanently blocks the system power. Optical communication terminal apparatus. 8. The method of claim 7,
Wherein the microprocessor is configured to initialize a configuration value of the MAC module through the serial interface when it is determined that the optical link is not connected for a predetermined time through the LOS signal of the optical module. An optical communication terminal device having an information storage function. 9. The method of claim 8,
The microprocessor,
And the overvoltage state is indicated by an LED when the voltage level of the optical module is detected to be equal to or greater than a predetermined value. 10. The method of claim 9,
The microprocessor further includes a storage medium, either internally or externally,
Wherein the storage medium stores information on the number of initialization times and the number of times the system power is turned off. 11. The method of claim 10,
The storage medium comprising:
Information on the number of hang-ups in the hang-up state of the MAC module;
Information on the number of initialization of the configuration setting value; And
Information on the number of times of the overvoltage; The optical communication terminal device having a fault detection / restoration / interruption and information storage function.

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