KR20110129658A - On-line device of W-PON system for WDM ｈｙｂｒｉｄ-ＰＯＮ - Google Patents

Abstract

An OLT device of a G-PON system for a WDM Hybrid-PON according to an embodiment of the present invention includes a Gigabit PHY capable of accommodating 1000BASE-FX ports, a 10 Gigabit PHY capable of accommodating 10 Gigabit fiber ports, and a 2.5 Gigabit interface. A gigabit switch module including a packet switch fabric supporting a 1 Gigabit interface with the Gigabit PHY and a 10 Gigabit interface with the 10 Gigabit PHY; A MAC providing a GEM interface to accommodate a G-PON Encapsulation Method (GEM) port, and a GEM frame that is connected to the MAC to identify a service of subscribers through the GEM port, and transmits and receives the GEM frame for each subscriber or the A channel module including a transceiver connected through a plurality of optical network units (ONUs) and a plurality of optical links using a Wavelength Division Multiplexing (WDM) scheme for multiplexing wavelengths for each service; And a management processor unit having a central processing unit (CPU) for executing the L2 and L3 protocols to control the gigabit switch module and the channel module.

Description

OPTICAL LINE TERMINATION APPARATUS OF GIGABIT-PASSIVE OPTICAL NETWORK SYSTEM FOR WDM HYBRID-PON}

Embodiments of the present invention relate to an Optical Line Termination (OLT) apparatus of a WDM over G-bit Hybrid Optical Network (G-PON) Hybrid PON system.

FTTH (Fiber To The Home) technology for efficient service of packet network such as Internet access, Voice over Internet Protocol (VoIP), IP-TV, etc. Network operators are expanding their reach locally.

PON connects only passive devices that do not require a power supply between the optical line termination (OLT) located at the operator's management station and the optical network terminal (ONT) provided to the subscriber.The Active Optical Network (AON) As it does not incur administrative costs like the method, it is a very economical service method for the operator.

PON is classified into A / B PON, E-PON, G-PON, and WDM-PON according to the method of transmitting protocol. Among them, G-PON is the most recently completed standardization work. (WDM-PON) is an optical subscriber network using wavelength division multiplexing (WDM). The wavelength division multiplexing technique widely used in the core backbone is applied to the optical subscriber network. An embodiment of the present invention proposes an OLT device of a G-PON system for a WDM Hybrid-PON in which a transmission method is implemented as a WDM-PON in a basic configuration of a G-PON system.

In one embodiment of the present invention, by implementing the transmission method in the basic configuration of the G-PON system with WDM-PON, it is possible to solve the problem of the interface limitation of the upper metro end, WDM Hybrid-PON G for large capacity, long distance transmission -Provide OLT device for PON system.

One embodiment of the present invention is a G-PON system for a WDM Hybrid-PON capable of accommodating up to 2,048 subscribers by accommodating four or more 1000Base-FX, one or more 10G fiber ports, and up to 32 GEM ports. Provide an OLT device.

The problem to be solved by the present invention is not limited to the above-mentioned problem, another task (s) not mentioned will be clearly understood by those skilled in the art from the following description.

An OLT device of a G-PON system for a WDM Hybrid-PON according to an embodiment of the present invention includes a Gigabit PHY capable of accommodating 1000BASE-FX ports, a 10 Gigabit PHY capable of accommodating 10 Gigabit fiber ports, and a 2.5 Gigabit interface. A gigabit switch module including a packet switch fabric supporting a 1 Gigabit interface with the Gigabit PHY and a 10 Gigabit interface with the 10 Gigabit PHY; A MAC providing a GEM interface to accommodate a G-PON Encapsulation Method (GEM) port, and a GEM frame that is connected to the MAC to identify a service of subscribers through the GEM port, and transmits and receives the GEM frame for each subscriber or the A channel module including a transceiver connected through a plurality of optical network units (ONUs) and a plurality of optical links using a Wavelength Division Multiplexing (WDM) scheme for multiplexing wavelengths for each service; And a management processor unit having a central processing unit (CPU) for executing the L2 and L3 protocols to control the gigabit switch module and the channel module.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and / or features of the present invention and methods for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

According to an embodiment of the present invention, by implementing the transmission method in the basic configuration of the G-PON system with WDM-PON, it is possible to solve the problem of interface limitation of the upper metro end, and to increase the capacity and long distance transmission.

According to one embodiment of the present invention, by accommodating four or more 1000Base-FX, one or more 10G fiber ports, and up to 32 GEM ports, up to 2,048 subscribers can be accommodated.

According to an embodiment of the present invention, by having a packet switch fabric supporting 1G interface and 10G interface, it may have a switching capacity capable of processing up to 100Gbps or more.

1 is a block diagram illustrating an OLT device of a G-PON system for a WDM Hybrid-PON according to an embodiment of the present invention.
2 is a diagram illustrating a signal system of an OLT device of a G-PON system for a WDM Hybrid-PON according to one embodiment of the present invention.
FIG. 3 is a detailed configuration diagram illustrating the gigabit switch module of FIG. 1.
4 is a detailed block diagram illustrating the channel module of FIG. 1.
FIG. 5 is a detailed configuration diagram illustrating the management processor unit of FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

1 is a block diagram illustrating an OLT device of a G-PON system for a WDM Hybrid-PON according to an embodiment of the present invention.

Referring to FIG. 1, an OLT device 100 of a G-PON system for a WDM Hybrid-PON according to an embodiment of the present invention may include a gigabit switching module (GSW) 110 and a channel module (CHannel). module 120, and Management Processor Unit (MPU) 130.

The gigabit switch module 110 supports a gigabit PHY capable of accommodating a 1000BASE-FX port, a 10 gigabit PHY capable of accommodating a 10 gigabit fiber port, and a 2.5 gigabit interface and supports the gigabit PHY. And a packet switch fabric supporting a 1 Gigabit interface with and a 10 Gigabit interface with the 10 Gigabit PHY.

Here, the Gigabit PHY may accommodate four or more 1000BASE-FX ports, and the 10 Gigabit PHY may accommodate one or more 10 Gigabit fiber ports. The gigabit PHY and the 10 gigabit PHY may be provided in the form of Small Formfactor Pluggable (SFP).

The gigabit switch module 110 may have a form of a line card, and the line card may include a DC-DC converter for converting a DC input voltage into a DC output voltage.

The channel module 120 includes a media access control (MAC) that provides a GEM interface to accommodate a G-PON Encapsulation Method (GEM) port. Here, the MAC may provide a 4 port GEM interface to accommodate 32 GEM ports.

In addition, the channel module 120 is connected to the MAC transmits and receives a GEM frame that can identify the service of the subscribers through the GEM port and WDM (Wavelength Division Multiplexing) scheme for multiplexing the wavelength by the subscriber or the service It further comprises a transceiver (transceiver) connected via a plurality of optical network units (ONU) and a plurality of optical links by using.

The transceiver generates optical signals having different wavelengths, routes, multiplexes, and demultiplexes the generated optical signals using passive optical devices such as an arrayed waveguide grating (AWG). Can transmit to ONU.

The channel module 120 may have a form of a line card, and the line card may include a DC-DC converter for converting a DC input voltage into a DC output voltage.

The management processor unit 130 includes a central processing unit (CPU) for controlling the gigabit switch module 110 and the channel module 120 by executing a layer 2 (L2) and layer 3 (L3) protocol.

The CPU may include a 64-bit 400Mbps high-performance Reduced Instruction Set Computer (RISC) CPU capable of accommodating 2048 or more subscribers.

The management processor unit 130 may have a form of a line card, and the line card may include a DC-DC converter for converting a DC input voltage into a DC output voltage.

When a failure occurs in the fan module, the management processor unit 130 may receive an alarm signal from the fan module and transmit a trap message to the control center.

The management processor unit 130 includes a hard disk for recording function when using the system log and voice protocol, a management port so that the control center can be remotely accessed from the control center at all times regardless of the service network, and initial setting or network disconnection of the system. It may further be provided with a console port for remote access is not possible from the control center.

2 is a diagram illustrating a signal system of an OLT device of a G-PON system for a WDM Hybrid-PON according to one embodiment of the present invention.

Referring to FIG. 2, main signals that can be accommodated in the backplane 140 are as follows.

-DC-48V power supply: Since a separate power supply module 150 cannot be included in the OLT device 100 of the G-PON system for the WDM Hybrid-PON, all line cards, that is, the gigabit switch module 110 and the channel module The 120 and the management processor unit 130 may receive a power supply of DC-48V and generate necessary power through a DC-DC converter implemented on each line card.

Fan / Power Alarm: A separate external fan module 150 is used, which, when a failure occurs, receives an alarm signal from it and sends a trap message to the control center for the fan module 150. You can monitor.

Line card control signal: A signal for controlling each line card in the management processor unit 130, and the signal line includes a Peripheral Component Interconnect Bus (PCI), a Management Data Clock (MDC) / Management Data Input / Output (MDIO). ), A SPI (Serial Peripheral Interface) and a local bus may be considered. The PCI bus is for the gigabit switch module 110 and is mainly used in a packet switch chip.

2.5G data bus: G-PON systems support speeds up to 2.488Gbps up and down, using a 2.5G interface with a packet switch fabric (see "111" in Figure 3) per port for OLT devices in the G-PON system. Can be connected. To support the 32 G-PON ports, it is desirable to design 32 2.5G data buses.

3 is a detailed configuration diagram illustrating the gigabit switch module 110 of FIG. 1.

Referring to FIG. 3, the gigabit switch module 110 includes a packet switch fabric 111, a gigabit PHY 112, a 10 gigabit PHY 113, a DC-DC converter 114, and a DDR SDRAM (Double Data Rate Synchronous Dynamic). Random Access Memory (115), and Light Emitting Diode (LED) 116.

The packet switch fabric 111 may support 16 or more 2.5G interfaces, 4 or more ports of Gigabit Ethernet, and 1 or more ports of 10G interfaces.

The packet switch fabric 111 is a part controlling in real time in the L2 / L3 protocol on the management processor unit (see "130" in FIG. 1), and can use the control and data path through the PCI bus. have.

The gigabit PHY 112 may be provided in the form of Small Formfactor Pluggable (SFP) in a structure capable of accommodating 1000Base-FX ports.

The 10 Gigabit PHY 113 may be provided in the SFP form in a structure capable of accommodating a 10G Fiber Module.

The DC-DC converter 114 may convert the DC-45V power supplied from the power module into power required for the system and output the converted power.

The DDR SDRAM 115 may be implemented with a capacity of about 128 Mbytes as a main memory of the gigabit switch module 110, but may be developed in a scalable form as needed.

The LED 116 may display an operation state of the gigabit switch module 110, and the like.

4 is a detailed block diagram illustrating the channel module 120 of FIG. 1.

Referring to FIG. 4, the channel module 120 may include a MAC 121, a transceiver 122, a DC-DC converter 123, a DDR SDRAM 124, and an LED 125.

The MAC 121 may provide a 4-port GEM interface in each line card to accommodate 32 GEM ports. Since the major chipset makers (Chipset Makers) are releasing chips in the form of 1-port 1 chip, the structure of such MAC 121 may be suitable.

The transceiver 122 may be connected to the MAC 121 to transmit / receive data such as a GEM frame for identifying a service of subscribers through the 32 GEM ports. Since the G-PON OLT optical module is still only a pig-tail type, a circuit design can be made in consideration of this.

In addition, the transceiver 122 is connected to a plurality of ONUs through a plurality of optical links using a WDM scheme for multiplexing wavelengths by subscriber or service. In this case, the transceiver 122 generates an optical signal having a plurality of different wavelengths, and after routing, multiplexing and demultiplexing the generated optical signal using a passive optical device such as an arrayed waveguide grating (AWG), It can transmit to the ONU via an optical link.

The DC-DC converter 123 may convert the DC-45V power supplied from the power module into power required for the system and output the converted power.

The DDR SDRAM 124 may be implemented as a main memory of the gigabit switch module 110 with a capacity of about 128 Mbytes, but may be developed in a scalable form as needed.

The LED 125 may display an operation state of the gigabit switch module 110, and the like.

FIG. 5 is a detailed configuration diagram illustrating the management processor unit 130 of FIG. 1.

Referring to FIG. 5, the management processor unit 130 may include a RISC CPU 131, a DDR SDRAM 132, a hard disk 133, a flash memory 134, and a boot ROM. ) 135, management port 136, and console port 137.

The RISC CPU 131 is a main processor that controls operations of the management processor unit 130, switches, and all other I / O interfaces. The RISC CPU 131 is an L3 device capable of accommodating 2048 subscribers and may be implemented with high performance of 64-bit 400Mbps. The RISC CPU 131 operates as a main module that performs the L2 / L3 protocol.

The DDR SDRAM 132 is a main memory of the RISC CPU 131 and may have a storage capacity of at least 256 Mbytes, but may be developed in an expandable form if necessary.

The hard disk 133 is required for a recording function when using a system log and a voice protocol. The hard disk 133 functions as a backup memory in the equipment separately from the NMS (Network Management System) control server, thereby providing an environment that can cope with a server failure.

The flash memory 134 may be used to store an operating system (OS) image and configuration information. In this case, the flash memory 134 preferably has a storage capacity of about 32 Mbytes in consideration of duplication of the OS image.

The boot ROM 135 is used at system boot-up time, and its storage capacity is preferably about 512 Kbytes.

The management port 136 is a port for a network management system (NMS) of 10/100 / 1000Base TX, and is used for the purpose of accessing the control center at all times regardless of the service network. The management port 136 may be used for remote access through, for example, Telnet, Secure Shell (SSH), or the like.

The console port 137 may be used as a console for a case where remote access is not possible due to system configuration and network disconnection.

As such, the OLT device of the G-PON system for the WDM Hybrid-PON according to an embodiment of the present invention accommodates four or more 1000Base-FX, one or more 10G fiber ports, and up to 32 GEM ports, thereby allowing a maximum of 2048. Subscribers, or 2048 Optical Network Terminals (ONTs).

In addition, the OLT device of the G-PON system for the WDM Hybrid-PON according to an embodiment of the present invention may have a switching capacity capable of processing up to 100 Gbps by having a packet switch fabric supporting 1G interface and 10G interface. have.

In addition, the OLT device of the G-PON system for the WDM Hybrid-PON according to an embodiment of the present invention may be configured in a 19-inch rack-mountable module detachable form, and each component may be implemented in a line card form. have. Accordingly, the OLT device of the G-PON system for the WDM Hybrid-PON according to an embodiment of the present invention may have a line card slot.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

110: Gigabit Switch Module
111: packet switch fabric
112: Gigabit PHY
113: 10 Gigabit PHY
114, 123, 138: DC-DC converters
115, 124, 132: DDR SDRAM
116, 125, 139: LED
120: channel module
121: MAC
122: transceiver
130: management processor unit
131: RISC CPU
133: hard disk
134: flash memory
135: Bootrom
136: management port
137: console port

Claims (10)

It supports Gigabit PHYs that can accommodate 1000BASE-FX ports, 10 Gigabit PHYs that can accommodate 10 Gigabit fiber ports, and 2.5 Gigabit interfaces, and supports 1 Gigabit interfaces with the Gigabit PHYs and 10 Gigabit interfaces with the 10 Gigabit PHYs. A gigabit switch module having a packet switch fabric;
A MAC providing a GEM interface to accommodate a G-PON Encapsulation Method (GEM) port, and a GEM frame that is connected to the MAC to identify a service of subscribers through the GEM port, and transmits and receives the GEM frame for each subscriber or the A channel module including a transceiver connected through a plurality of optical network units (ONUs) and a plurality of optical links using a Wavelength Division Multiplexing (WDM) scheme for multiplexing wavelengths for each service; And
A management processor unit having a central processing unit (CPU) for executing the L2 and L3 protocols to control the gigabit switch module and the channel module.
OLT device of the G-PON system for WDM Hybrid-PON comprising a.
The method of claim 1,
The gigabit switch module, the channel module, and the management processor unit is in the form of a line card OLT device of the G-PON system for the WDM Hybrid-PON.
The method of claim 2,
Wherein each line card includes a DC-DC converter for converting a DC input voltage into a DC output voltage.
The method of claim 1,
The management processor unit receives an alarm signal from the fan module when a failure occurs in the fan module, and transmits a trap message to the control center OLT device of the G-PON system for WDM Hybrid-PON.
The method of claim 1,
The management processor unit further comprises a hard disk for recording function when using the system log and voice protocol OLT device of the G-PON system for WDM Hybrid-PON.
The method of claim 1,
The management processor unit further comprises a management port to be remotely accessible from the control center at any time regardless of the service network OLT device of the G-PON system for WDM Hybrid-PON.
The method of claim 1,
The management processor unit further comprises a console port for remote access is not possible from the control center due to the initial configuration of the system or network disconnection OLT device of the G-PON system for WDM Hybrid-PON.
The method of claim 1,
The gigabit and 10 gigabit PHY OLT device of the G-PON system for WDM Hybrid-PON, characterized in that provided in the form of Small Formfactor Pluggable (SFP).
The method of claim 1,
The OLT device of the G-PON system for WDM Hybrid-PON, characterized in that the CPU is a 64-bit 400Mbps high-performance Reduced Instruction Set Computer (RISC) CPU that can accommodate more than 2048 subscribers.
The method of claim 1,
The gigabit PHY can accommodate four or more 1000BASE-FX ports,
The 10 Gigabit PHY can accommodate one or more 10 Gigabit fiber ports,
The OLT device of the G-PON system for the WDM Hybrid-PON, characterized in that the MAC provides a four-port GEM interface to accommodate 32 GEM ports.

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