WO2007138079A1 - Terminaison de ligne optique et unité de réseau optique - Google Patents

Terminaison de ligne optique et unité de réseau optique Download PDF

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Publication number
WO2007138079A1
WO2007138079A1 PCT/EP2007/055257 EP2007055257W WO2007138079A1 WO 2007138079 A1 WO2007138079 A1 WO 2007138079A1 EP 2007055257 W EP2007055257 W EP 2007055257W WO 2007138079 A1 WO2007138079 A1 WO 2007138079A1
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WO
WIPO (PCT)
Prior art keywords
optical
onu
sending end
register
olt
Prior art date
Application number
PCT/EP2007/055257
Other languages
English (en)
Inventor
Hoshin Lee
Jaehyung Lee
Sangcheol Mun
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Priority to JP2009512587A priority Critical patent/JP2009539290A/ja
Publication of WO2007138079A1 publication Critical patent/WO2007138079A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0226—Fixed carrier allocation, e.g. according to service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0247—Sharing one wavelength for at least a group of ONUs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0088—Signalling aspects

Definitions

  • the invention is related to Passive Optical Network, especially, methods of controlling optical signal sending ends of Optical Network Units (ONUs) and Optical Line Terminal that constitutes a Ethernet-based Passive Optical Network.
  • the device and method of this invention are designed to forcibly cut off the power source of the sending end of an optical signal transmitting and receiving module unless a register request message is received from the OLT for a given time after a register request message is received by the sending end. In so doing, it can resolve the problem that is caused by a bad optical module or laser driver, which paralyze the entire PON (Passive Optical Network) equipment.
  • OPTICAL LINE TERMINATION AND OPTICAL NETWORK UNIT (TN: Literally, Method for controlling sending ends of optical network unit, optical network terminal devices) [Brief Description of Drawings]
  • Drawing 1 shows a generic (G)E-PON structure diagram
  • Drawing 2 is a drawing for explaining discovery handshake message exchange in (G)E-PON
  • Drawing 3 illustrates an ONU configuration based on this invention
  • Drawing 4 is a chart that illustrates the control flow of an ONU sending end based on this invention
  • Drawing 5 illustrates an OLT configuration based on this invention .
  • the invention is related to Passive Optical Network, especially, methods of controlling optical signal sending ends of Optical Network Units (ONUs) and Optical Line Terminal that constitutes a Ethernet-based Passive Optical Network .
  • PON Passive Optical Network
  • OLT Optical Line Termination
  • ONUs Optical Network Units
  • TDM time division multiple access
  • WDM wavelength division multiple access
  • TDM(A)-PON includes ATM-based ATM-PON, (Giga byte) Ethernet-based (G)E-PON, and general frame protocol-based G-PON while wavelength division multiple access PON includes WDM-PON.
  • (G)E-PON is an inexpensive share optical subscriber network that has eliminated such active outdoor elements as regenerators and amplifiers, minimizing optical cable requirements, and reducing optical ports at the central base station.
  • (G)E-PON passive equipment [devices] includes single wavelength optical cable, passive optical splitters, couplers, connectors and splices. As shown in Drawing 1, the network devices like OLT and multiple ONUs are located at the two ends of a PON. Optical signals are delivered to one optic fiber through a PON being divided or combined into multiple optic fibers or loaded on the network by splitters and couplers depending on whether the optical signal is upstream or downstream. In such E-PON system, data may experience collision in upstream transmission.
  • the OLT performs discovery process as illustrated in Drawing 2.
  • the OLT delivers MPCP (Multi-Point Control Protocol) gate messages to all ONUs.
  • ONUs other than those already registered transmit a register_request message at the point of grant start following a random delay.
  • MPCP Multi-Point Control Protocol
  • the OLT receives register_request messages opening its discover window for a preset time duration.
  • the OLT computes RTT (Round Trip Time) for all ONUs located at varying distances using the above-mentioned register_request messages and transmits register messages to them using LLID (Logical Link Identifier) .
  • RTT Red Trip Time
  • LLID Logical Link Identifier
  • an ONU sends a frame with its own LLID as user interface when the OLT sends to the ONU a frame with a preamble containing the registered ONU LLID inserted.
  • the OLT allocates upstream time slots by giving grant to all ONUs dynamically after confirming the queue of each ONU using report messages received from the ONUs periodically.
  • the OLT forcibly deregisters a failing ONU to ensure service by the other ONUs if a given ONU fails to respond to OLT requests for report messages because of an optical cable disconnected in its fiber drop section or a malfunction of the ONU system or if the ONU fails to send report messages to the OLT within the time slot allocated by the OLT to the ONU or sends an upstream MPCP message or user frame at times other than the allocated time slot.
  • the OLT blocks upstream access by deregistering all ONUs deeming that not only the defective ONU but also all the ONUs do not respond properly as one ONU grasps the entire upstream time slots if the optical module laser is turned on constantly because of a specific ONU' s malfunction in laser control signals, the laser control signal and the optical module control signal entry are set up in reverse, or the laser is turned on constantly because of the optical module malfunction, irrespective of the laser control signal.
  • the OLT has to inspect all ONUs as the OLT does not know which ONU has the problem, causing a situation where even normal ONUs cannot can not access service until the failing ONU is located.
  • This invention is designed to provide methods for controlling ONUs, OLT and ONU sending ends which can prevent such network problems as those where the entire PON devices are paralyzed by detecting the malfunction or defective optical module or laser control circuit of a specific ONU on a (G)E-PON.
  • This invention is also designed (or has another purpose) to provide methods for controlling ONUs, OLT and ONU sending ends so that the other ONUs may receive service continuously, apart from the problem-arisen ONU on a (G)E-
  • the ONU based on an example of this invention implementation designed to achieve the said purposes is an optical network unit that constitutes an Ethernet-based PON
  • Passive Optical Network includes such feature devices as: an optical transceiver module; a power source switch that turns on or off power supplied to the said optical transceiver module; and a controller designed to shut off the power source for the sending end of the optical transceiver module by controlling the said power switch depending on register messages received from the OLT after register_request message is received.
  • the said controller features shut off of the power to the said sending end eventually if no register message is received despite register_request messages transmitted repeatedly by a given times while shutting off the power to the said sending end of the said optical transceiver module if the said register message is not received in a given time (Tl) after the said register_request message is transmitted.
  • the power source of the sending end of an optical signal transmitting and receiving module is forcibly cut off unless a register request message is received from the OLT in a given time after a register request message is received, it can resolve the problem that is caused by a bad optical module or laser driver, which paralyze the entire PON equipment. Further, the said ONU controller may shut off power to the sending end by support by the other station even in circumstances where the controller cannot diagnose the situation itself as it is designed to shut off or otherwise control the sending end power source in response to the optical transmission shut-off message transmitted by the OLT.
  • an optical line terminal that constitutes an Ethernet-based PON (Passive Optical Network) also includes such feature devices as an optical transceiver module; a failure detecting device that detects failures by monitoring if signals are constantly transmitted from an ONU through the sending end of the said optical transceiver module; and a controller that is designed to send optical signal shut- off messages to the ONU whose failure has been detected by the said failure detecting device.
  • an optical transceiver module a failure detecting device that detects failures by monitoring if signals are constantly transmitted from an ONU through the sending end of the said optical transceiver module
  • a controller that is designed to send optical signal shut- off messages to the ONU whose failure has been detected by the said failure detecting device.
  • the ONU controller is eventually able to prevent a problem that can paralyze the entire PON equipment by shutting off the power source to the optical transceiver module send end by indirectly obtaining system failure causes that it cannot detect for itself, from the ONU in such a constitution .
  • the methods controlling the sending end of the ONUs that constitute an Ethernet-based PON based on another example of this invention implementation includes : the first stage that transmits messages by supplying power to the said sending end of the ONUs; the second stage that checks if register messages are received between the start and end of the time counter; the third stage that repeats the said first and second stages by a given times after shutting off the power source to the said sending end when the said register messages are not received; and the fourth stage that eventually shuts off the power source to the said sending end if the said register messages are not received after the request messages are repeated by a given times .
  • the methods may also include the fifth stage that shuts off the power source to the said sending end in response to the optical transmission shut-off message transmitted by the
  • this method can also resolve the problem that is caused by a bad optical module or laser driver, which paralyze the entire PON equipment.
  • Drawing 3 illustrates an ONU configuration based on this invention
  • the ONU an optical network unit that constitutes an Ethernet-based PON or more specifically a (G)E-PON, includes an ONU controller (100), optical transceiver module (200), power switch (300), and power source. It would be self-explanatory that, in addition, the ONU includes an interface part identical to those of general optical network units.
  • the optical transceiver module has a concept that it includes optical signal sending ends (210, 220) and receiving ends (230, 240) in a larger sense.
  • the optical transceiver module generates and transmits optical signals over an optical network cable based on control by an ONU controller which is being described below. It also passes optical signals to the ONU controller (100) by transmitting them over the optical network cable after converting them into electrical signals.
  • the sending end of the optical transceiver module (200) is provided with power source through a power switch (300) that is controlled by the ONU controller (100) .
  • WDM Wavelength Division Multiplexer
  • the power switch (300) embodied by FETs turns on or off the power from the power source to the sending or receiving end of the optical transceiver module (200) .
  • the power source path may be turned on or off by the ONU controller (100) being described below.
  • the ONU controller (100) shuts off the power to the sending end of the optical transceiver module (200) by controlling the power switch if no register message is received from the OLT in response to the register_request messages after power is supplied to the sending end of the optical transceiver module (200) .
  • the said controller (100) may eventually shut off power to the said sending end if no register message is received despite register_request messages transmitted repeatedly by a given times while shutting off the power to the said sending end of the said optical transceiver module (200) if the said register message is not received within a given time (Tl) after the said register_request message is transmitted.
  • the said controller (100) may shut off power to the said sending end in response to an optical transmission shut-off message received from the OLT.
  • the said controller (100) may be segmented into such hardware as CPU, EEPROM, MPCP (Multi- Point Control Protocol) processing engine, MAC processing part, packet processing engine, and laser driver control part, and software logic modules.
  • Drawing 4 that illustrates the control flow of the sending end of the ONU as follows :
  • the ONU controller (“controller” hereinafter) (100) checks EEPROM fail state (S2 stage) after setting the time counter and fail counter to ⁇ 0' when the system is initialized. It maintains the power to the sending end of the optical transceiver module (200) in shut off state (S3 stage) if fail data is recorded on the EEPROM through such checking process.
  • the controller (100) transmits register_request messages (S5 stage) by controlling the laser driver (210) after a random delay of 0-14.4 seconds. This is to have the ONU duly registered as the sending end power source is turned off in the below-described method in 4.8 seconds from the time a laser diode is turned on even when all the ONUs are deregistered while the laser diode of a defective ONU remains turned on.
  • the controller starts time count (S6 stage) after turning on the laser diode so that a register_request message may be transmitted. It then checks if any register message is received (S7 stage) before the time count elapses (4.8 seconds) . It can find it out by checking if the register message is received. If a register message is found to have been received through such checking, the controller (100) initializes the timer (S8 stage) and performs its normal processing (S9 stage) . In other words, the ONU transmits frames by obtaining a grant from the OLT.
  • the controller (100) increases the fail counter by 1 increment (SlO stage) deeming the laser driver (210) has failed or is the sending end is defective if no register message is received from the OLT before the time count elapses, based on such checking. If the fail counter increases to a repeat time of 3 as set, the controller returns to Sl stage mentioned above after recording the fail data on the EEPROM (S12 stage) . For your reference, the said fail counter is set to 3 in order to remove any room for a mistaken judgment treating even normal ONUs as defective if laser drivers of both the normal and defective ONUs are, by chance, turned on at the same time within the random delay of 0-14.4 seconds or turned off in 4.8 seconds.
  • the controller (100) shuts of the power source to the optical transceiver module (200) sending end while initializing the timer. It returns to S4 stage after standing by for a time of 14.4 seconds minus the random delay. This is to have normal ONUs duly registered at time other than those when the laser diode of a defective ONU is turned on by setting a standby time so that all ONUs are not registered when the defective ONU repeatedly transmits optical signals without standing by at all .
  • the ONU based on this invention can resolve the problem that is caused by a bad optical module or laser driver, which paralyze the entire PON equipment .
  • an ONU controller cannot shut off power to the sending end in the way in the above-mentioned implementation example, when the ONU controller is unable to diagnose a failure of an optical module or laser driver, for example, if it turns out that an ONU is registered with the OLT in a normal manner though the laser diode of the optical transceiver module (200) remains turned on continuously.
  • Drawing 5 illustrates an OLT configuration based on an example implementation of this invention.
  • An OLT also includes an optical transceiver module (500), OLT controller (400) and failure detecting element (600) .
  • the optical transceiver module (500) generates and transmits optical signals over optical network cable according to control by the OLT controller (400) and passes such optical signal to the OLT controller (400) by converting them into electrical signals.
  • the failure detecting element (600) reports to the OLT controller (400) by monitoring if signals (SD: Signal Detect) from the ONU transmitted through the receiving end amplifier (550) of the optical transceiver module (500) is steadily transmitted for a given time (or more often than a given cycle) .
  • the failure detecting element (600) may be embodied by a CPLD (Complex Programmable Logic Device) .
  • the OLT controller (400) transmits a transmission shut-off message to the ONU that has been detected by the said failure detecting element (600) to have a failure.
  • the OLT controller (400) also includes CPU, DBA (Dynamic Bandwidth Allocation) engine, MPCP engine, MAC engine and packet processing engine.
  • DBA Dynamic Bandwidth Allocation
  • the mechanism or operation of an OLT with the said constitution may be explained as follows: If optical signals are continuously received because of a malfunction of a given ONU sending end, such signals are transmitted as Signal Detect signals through the amplifier (540) of the optical transceiver module (540) receiving end. If such SD signals maintain a given logic level above a given cycle of frequency, the failure detecting element (600) report it to the OLT controller (400) .
  • the OLT controller (400) sends a transmission shut-off message to the ONU that has been detected by the said failure detecting element (600) to have a failure, under such situation, the ONU controller shuts off power to the sending end of the optical transceiver module in response to the transmission shut-off message sent by the OLT controller.
  • signals sent to the OLT are shut off.
  • the ONU controller shuts off power to the sending end of the optical transceiver module in response to the transmission shut-off message sent by the OLT controller, it is possible to shut off power to the sending end with support by the other station under circumstances where self-diagnosis is impossible, duly resolving problems that may paralyze the entire PON equipment .
  • An OLT usually employs DBA (Dynamic Bandwidth Allocation) in order to allocate grant to each ONU based on queue data of the ONUs.
  • DBA Dynamic Bandwidth Allocation
  • the current DBA defines the discovery frequency time to be 50ms, which tells how often the ONUs are to be discovered. It takes at least 1.6 seconds (32 x 50ms) to register one ONU when maximum 32 ONUs are discovered.
  • register_request messages from two or more ONUs collide within a window under such a process they cannot be recognized by the OLT. Therefore, the maximum time required for total 32 ONUs to be registered is set to 4.8 seconds, by multiplying the net required time by 3.
  • this invention features a merit that can resolve the problem that is caused by a bad optical module or laser driver, which paralyze the entire PON equipment .
  • the said ONU controller has a merit that it may shut off power to the sending end by support by the other station even in circumstances where the controller cannot diagnose the situation itself as it is designed to shut off or otherwise control the sending end power source in response to the optical transmission shut-off message transmitted by the OLT, thus providing the effect of resolving problems that may paralyze the entire PON equipment .
  • this invention provides another merit that the system reliability can be enhanced as the remaining ONUs may perform normal service even when an errors takes place with an ONU.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne une unité de réseau optique (ONU) formant un réseau PON (réseau optique passif) Ethernet équipé d'un module émetteur-récepteur optique, d'un commutateur de source d'alimentation activant ou désactivant l'alimentation fournie au module émetteur-récepteur optique, et d'une unité de commande destinée à désactiver la source d'alimentation pour l'extrémité d'envoi du module émetteur-récepteur optique par commande dudit commutateur de puissance en fonction des messages d'enregistrement reçus de l'OLT après la réception du message de demande d'enregistrement.
PCT/EP2007/055257 2006-05-30 2007-05-30 Terminaison de ligne optique et unité de réseau optique WO2007138079A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009512587A JP2009539290A (ja) 2006-05-30 2007-05-30 局側の光回線終端装置（ｏｌｔ）および加入者側の光回線終端装置（ｏｎｕ）

Applications Claiming Priority (2)

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KR10-2006-0048930 2006-05-30
KR1020060048930A KR100765471B1 (ko) 2006-05-30 2006-05-30 광망 종단 장치와 광 회선 단말장치 및 광망 종단장치의 광송신단 제어방법

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WO2007138079A1 true WO2007138079A1 (fr) 2007-12-06

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CN110349380A (zh) * 2019-08-19 2019-10-18 国网江苏省电力有限公司镇江供电分公司 基于通信终端光网络单元的配电网低压线路停电报警方法

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