KR100500665B1 - Apparatus for Multiplexing Gigabits Ethernet Signal and Optical Transponder using that - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a gigabit Ethernet signal multiplexing device and an optical transponder using the same.

2. The technical problem to be solved by the invention

The present invention provides an optical transponder that receives a Gigabit Ethernet (GbE) optical signal from an external client system and converts it into a wavelength division multiplex (WDM) optical channel, thereby multiplexing multiple Gigabit Ethernet (GbE) optical signals. It is an object of the present invention to provide a gigabit Ethernet signal multiplexing device and an optical transponder using the same for transmitting over a wavelength division multiplex (WDM) optical channel.

3. Summary of the Solution of the Invention

An optical transponder using a Gigabit Ethernet (GbE) signal multiplexing apparatus, comprising: optical transmission and reception means for converting a GbE optical signal into an electrical signal; Gigabit Ethernet signal multiplexing means for mapping photoelectrically converted multi-channel GbE electrical signals to SDH / SONET (Synchronous Digital Hierarchy / Synchronous Optical NETwork) frames; Synchronization fitting means for performing maintenance signal processing and pointer processing of the SDH / SONET frame; And monitoring control means for controlling the respective functional means and monitoring the performance and the alarm, wherein the Gigabit Ethernet (GbE) signal multiplexing means is transmitted from an optical transmission / reception means for converting a GbE optical signal into an electrical signal. Parallelization means for parallelizing the GbE electrical signals; 8B / 10B decoding means for decoding the electrical signal delivered from the parallelizing means; Signal monitoring means for detecting the presence or absence of an error by monitoring the Ethernet frame transmitted through decoding by the 8B / 10B decoding means; Packetization means for packetizing the Ethernet frame transmitted through the signal monitoring means to a predetermined size; And concatenation means for performing a function of mapping the Ethernet frame packetized by the packetizing means into a virtual container which is a unit constituting an SDH / SONET frame.

4. Important uses of the invention

The present invention is used in optical communication networks and the like.

Description

Apparatus for Multiplexing Gigabits Ethernet Signal and Optical Transponder using that}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transponder used in a wavelength division multiplexing optical transmission system. In particular, the present invention relates to a gigabit ethernet for multiplexing multiple Gigabit Ethernet (GbE) optical signals and allocating them to one wavelength division multiplexing (WDM) optical channel. (Gigabit Ethernet) A signal multiplexing device and an optical transponder using the same.

1 is a block diagram of an embodiment of a general wavelength division multiplexing optical transmission system to which the present invention is applied.

The wavelength division multiplex optical transmission system is a system that can dramatically increase the bandwidth utilization efficiency, that is, the transmission capacity, by splitting and transmitting multiple wavelengths to one optical fiber in an optical transport network (OTN). As shown in FIG. 1, an optical channel unit 120 for receiving a dependent signal 110 transmitted from an external client system and converting it into a wavelength multiplexing (WDM) optical channel having a wavelength specified according to ITU-T recommendation. An optical multiplier 130 for receiving and multiplexing the optical signal transmitted from the optical channel unit 120 and an optical amplification unit 140 for amplifying the optical signal multiplexed by one optical fiber to a predetermined level; The optical multiplexer 150 receives the optical signal transmitted through the optical path 141 and demultiplexes the optical signal transmitted by the optical path 141, and the optical signal demultiplexed by each wavelength multiplexing (WDM) optical channel in the global multiplexer 150. And a sub-client (Client) optical channel portion (121, 122) for converting the signal to the slave (111, 112) for the system.

In FIG. 1, "#N" means the maximum number of optical channels that a wavelength division multiplexing optical transmission system can accommodate. The number of optical channels is "8", "16", "32", "40", "80", and "160". And so on. Each optical channel has a transmission rate of 2.5 Gb / s or 10 Gb / s and the total transmission capacity of the system is obtained by multiplying the transmission rate per channel by the number of channels.

In addition, in FIG. 1, "#M" shows a case in which any of the N optical channels is replaced with a GbE multiplexing (Mux) optical transponder, and "#n" indicates that the GbE multiplexing (Mux) optical transponder is to be multiplexed. It means the maximum GbE dependent signal that can be. Here, n = 2 or more may be possible in case of having a 2.5Gb / s transmission rate per optical channel, and n = 8 or more in case of having a 10Gb / s transmission rate.

2 is a block diagram of an embodiment of an optical transponder for receiving a conventional gigabit Ethernet (GbE) optical signal.

As shown in FIG. 2, a conventional optical transponder that accepts a GbE optical signal receives an external 1.25 GbE optical signal and converts the optical / pre-converted or pre-optical conversion of a 1.25GbE electric signal, which is a reverse process. The clock and data recovery (CDR) is reproduced from the electrical signal converted by the connected optical transmitter 210 and the slave network connected optical transmitter 210 (CDR), and the 1.25 Gb / s serial electrical signal has a low transmission speed. Clock & Data Recovery (CDR) and Serializer & DESerializer (SERDES) 220, CDR and SERDES to Serialize (Deserialize) and vice versa Parallel Signal to 1.25Gb / s Serial Signal (Serialize) The performance monitoring unit 230, which is inputted at 220 and monitors 8B / 10B codes of the GbE signal, determines whether an error has occurred, or converts a parallel signal input from the performance monitoring unit 230 into a 1.25Gb / s serial signal. The reverse process is input from the wavelength multiplexing (WDM) connected optical transmitter 250 Receives 1.25 Gb / s GbE electrical signals from the CDR and SERDES unit 240 and the CDR and SERDES unit 240 for reproducing data and clocks from the serial electrical signals and converting them into parallel signals with low transmission rates. WDM), a wavelength multiple division (WDM) network-connected optical transmitter 250 for optically / preconverting a WDM optical channel, which is pre / optical conversion into an optical channel or vice versa.

As such, the optical transponder belongs to the optical channel unit 120 in the wavelength division multiplexing transmission system and plays an important role in connecting to an external client system. In the conventional wavelength division multiplexing system, the optical transponder is mainly SDH / SONET. Although it is configured to accept signals, in recent years, the explosion of data communication traffic has also increased the demand for various connection standards such as Gigabit Ethernet (GbE), Enterprise Systems Conectivity (ESCON), and Fiber Distributed Data Interface (FDDI). Among them, it is essential to accommodate Gigabit Ethernet (GbE) signals in a wavelength division multiplex optical transmission system, but conventional optical transponders are capable of receiving and transmitting one 1.25Gb / s GbE (hereinafter, referred to as '1.25GbE') signal. Only performed.

Accordingly, as shown in FIG. 1, in the wavelength division multiplexing system having a transmission rate of 2.5 Gb / s or 10 Gb / s, the allocation of one 1.25 GbE signal to an individual optical channel causes a problem of low bandwidth usage efficiency. There is this.

In addition, by allocating one 1.25 GbE signal to an individual optical channel in a wavelength division multiplex system having a transmission rate of 2.5 Gb / s or 10 Gb / s, an individual component increases and a cost burden increases accordingly.

The present invention has been proposed to solve the above problems, and in the optical transponder receiving a gigabit Ethernet (GbE) optical signal from an external client system to convert to a wavelength division multiplex (WDM) optical channel, An object of the present invention is to provide a gigabit Ethernet signal multiplexing device and an optical transponder using the same for multiplexing a Gigabit Ethernet (GbE) optical signal and then transmitting it through a wavelength division multiplex (WDM) optical channel.

That is, in the present invention, instead of the optical transponder having the function of receiving only the existing GbE signal of one channel and transmitting it through the WDM optical channel, multiple GbE signals are multiplexed and then transmitted through one WDM optical channel to improve wavelength operation efficiency. It is an object of the present invention to provide a gigabit Ethernet signal multiplexing device and an optical transponder using the same, so that the height and the area occupied by the optical transponder in the system are reduced. Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention, there is provided an optical transponder using a gigabit Ethernet (GbE) signal multiplexing apparatus, comprising: optical transmitting and receiving means for converting a GbE optical signal into an electrical signal; Gigabit Ethernet signal multiplexing means for mapping photoelectrically converted multi-channel GbE electrical signals to SDH / SONET (Synchronous Digital Hierarchy / Synchronous Optical NETwork) frames; Synchronization fitting means for performing maintenance signal processing and pointer processing of the SDH / SONET frame; And monitoring control means for controlling the respective functional means and monitoring the performance and the alarm, wherein the gigabit Ethernet signal multiplexing means comprises: the GbE electricity transmitted from the optical transmission / reception means for converting a GbE optical signal into an electrical signal; Parallelization means for parallelizing signals; 8B / 10B decoding means for decoding the electrical signal delivered from the parallelizing means; Signal monitoring means for detecting the presence or absence of an error by monitoring the Ethernet frame transmitted through decoding by the 8B / 10B decoding means; Packetization means for packetizing the Ethernet frame transmitted through the signal monitoring means to a predetermined size; And concatenation means for performing a function of mapping the Ethernet frame packetized by the packetizing means into a virtual container, which is a unit constituting an SDH / SONET frame. The present invention further comprises a digital wrapper means for remapping the mapped SDH / SONET frame to an OTN frame and inserting an error correction (FEC) code. A gigabit Ethernet (GbE) signal multiplexing apparatus comprising: paralleling means for parallelizing the GbE electrical signal transmitted from an optical transmission / reception means for converting a GbE optical signal into an electrical signal; 8B / 10B decoding means for decoding the electrical signal delivered from the parallelizing means; Signal monitoring means for detecting the presence or absence of an error by monitoring the Ethernet frame transmitted through decoding by the 8B / 10B decoding means; Packetization means for packetizing the Ethernet frame transmitted through the signal monitoring means to a predetermined size; And concatenation means for performing a function of mapping the Ethernet frame packetized by the packetization means into a virtual container which is a unit constituting an SDH / SONET frame.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of an optical transponder using a gigabit Ethernet (GbE) signal multiplexing apparatus according to the present invention.

As shown in FIG. 3, an optical transponder using a gigabit Ethernet (GbE) signal multiplexing apparatus according to the present invention includes a GbE optical transceiver 310 and a GbE optical transceiver 310 for converting a GbE optical signal into an electrical signal. GbE signal multiplexer 320 for mapping multi-channel GbE electrical signals photoelectrically converted into SDH / SONET frames, and SDH / SONET framers for maintenance signal processing and pointer processing of SDH / SONET frames. 330, a digital wrapper unit 350 for mapping an SDH / SONET frame to an optical transport network (OTN) frame and inserting an error correction (FEC) code, and controlling the functions of the components A monitoring control unit 380 for monitoring the performance and alerts of the functional blocks.

In addition, according to the interface condition between the digital wrapper unit 350 and the SDH / SONET framer 330, data and a clock are input between the digital wrapper unit 350 and the SDH / SONET framer 330 from an input serial electrical signal. It further includes a CDR and SERDES unit 340 for reproducing and converting into a parallel signal having a low transmission rate.

4 is a diagram illustrating an embodiment of an optical transponder multiplexing two channels of a 1.25GbE signal into a 2.5Gb / s signal as an embodiment of an optical transponder multiplexing a GbE signal according to the present invention.

As shown in FIG. 4, an optical transponder for multiplexing two channels of 1.25GbE signals into 2.5Gb / s signals includes a GbE optical transceiver 310, a GbE signal multiplexer 320, and a 2.5Gb / s SDH / SONET. (STM-16: Synchronous Transfer Mode-16) A framer 330, a 2.5Gb / s CDR and SERDES 340, and a 2.5Gb / s digital wrapper 350 are configured.

In particular, GbE signal multiplexer 320 includes 1.25 GbE SERDES (i.e., includes Deserializer 401 and Serializer 406), 8B / 10B Encoder 407 and Decoder 402, GbE Signal Performance Monitor 403 And a packet processing unit (ie, including the packetizing unit 404 and the depacketizing unit 408) and a concatenation unit 405.

Detailed functions and operations of the components are as follows.

When the 1.25GbE signal is input from the external client system, the 1.25GbE optical / electric converter included in the GbE optical transceiver 310 converts the optical / electrical signal, and then regenerates the data and clock in the 1.25GbE Deserializer 401 and serial signal. Is converted into a parallel low speed signal. The parallel-converted GbE signal separates only the actual GbE signal having a capacity of 1 Gb / s in the 8B / 10B decoder 402 and then reads an error by monitoring the Ethernet frame through the GbE signal performance monitoring unit 403. Ethernet frame has a structure in which the frame length is variable according to the amount of data carried in the frame, whereas SDH / SONET frame has a certain size, it is necessary to process the Ethernet frame into a frame of a certain size. Is performed by the packetizer 404. As a method of packetizing Ethernet signals with a constant size, a method using general framing procedure (GFP) frames and a method using high level data link control (HDLC) frames are mainly used. The concatenating unit 405 performs a function of mapping a GFP or HDLC frame into a virtual container, which is a unit constituting the SDH / SONET frame, and the 2.5Gb / s SDH / SONET framer 330 transmits a maintenance signal. It generates overhead to generate a complete STM-16 signal.

In addition, the 2.5Gb / s SDH / SONET framer 330 usually includes a serializer function and is output as a 2.5Gb / s serial signal so that the 2.5Gb / s digital wrapper 350 and the 2.5Gb / s CDR and SERDES interface to the 2.5Gb / s digital wrapper 350. 340 is used to convert the signal back into a parallel signal.

Therefore, if the 2.5Gb / s SDH / SONET framer 330 is output as a parallel signal (typically 155Mb / s, 16bit) rather than a serial signal of 2.5Gb / s speed, the 2.5Gb / s CDR and SERDES 340 You do not need to use it. The 2.5Gb / s digital wrapper 350 inserts an error correction (FEC) code and adds the overhead of transmitting a maintenance signal used in the optical transmission network (OTN) to add the CDR and SERDES 360 shown in FIG. It is converted into a serial signal of 2.67Gb / s through the WDM network connection optical transceiver 370 is transmitted / converted by the optical transmission.

So far, the detailed functions and operations have been described with respect to the process of proceeding from the external client system to the WDM network, and the process of proceeding from the WDM network to the external client system is performed by performing the reverse function of the above function.

5 is an exemplary diagram of an optical transponder for multiplexing a 10 channel 1.25GbE signal into a 10Gb / s signal according to the present invention.

The 10Gb / s optical transponder shown in FIG. 5 has basically the same configuration as the 2.5Gb / s optical transponder shown in FIG. 4 and has the same function and operation.

As illustrated in FIG. 5, an optical transponder for multiplexing 1.25 GbE signals of eight channels into 10 Gb / s signals includes a GbE optical transceiver 310, a GbE signal multiplexer 320, and a 10 Gb / s SDH / SONET (STM). -64: Synchronous Transfer Mode-64) A framer 330, 10Gb / s CDR and SERDES 340, and 10Gb / s digital wrapper 350 are configured.

In particular, GbE signal multiplexer 320 includes 1.25 GbE SERDES (ie, includes Deserializer 501 and Serializer 506), 8B / 10B encoder 507 and decoder 502, GbE signal performance monitor 503. And a packet processing unit (ie, including the packetizing unit 504 and the depacketizing unit 508) and a concatenation unit 505.

Detailed functions and operations of the components are as follows.

When a 1.25GbE signal is input from an external client system, the 1.25GbE optical / electric converter included in the GbE optical transceiver 310 converts the optical / electrical signal, and then regenerates data and clocks in the 1.25GbE Deserializer 501 and serial signal. Is converted into a parallel low speed signal. The parallel-converted GbE signal separates only a real GbE signal having a capacity of 1 Gb / s in the 8B / 10B decoder 502 and then reads an error by monitoring an Ethernet frame through the GbE signal performance monitor 503. Ethernet frame has a structure in which the frame length is variable according to the amount of data carried in the frame, whereas SDH / SONET frame has a certain size, it is necessary to process the Ethernet frame into a frame of a certain size. Is performed in the packetizer 504. As a method of packetizing Ethernet signals with a constant size, a method using general framing procedure (GFP) frames and a method using high level data link control (HDLC) frames are mainly used. The concatenation unit 505 performs a function of mapping a GFP or HDLC frame into a virtual container, which is a unit constituting the SDH / SONET frame, and the 10Gb / s SDH / SONET framer 330 transmits a maintenance signal. Generates overhead to generate a complete STM-64 signal.

In addition, since the 10Gb / s class SDH / SONET framer 330 is usually output as a parallel signal of 622Mb / s, 16bit, the 10Gb / s CDR and SERDES 340 need not be used. The 10Gb / s digital wrapper 350 inserts an error correction (FEC) code and adds the overhead of transmitting a maintenance signal used in the optical transmission network (OTN) to add the CDR and SERDES 360 shown in FIG. It is converted into a serial signal through the WDM network connection optical transceiver 370 is transmitted / converted by the optical transmission.

So far, the detailed functions and operations have been described with respect to the process of proceeding from the external client system to the WDM network, and the process of proceeding from the WDM network to the external client system is performed by performing the reverse function of the above function.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention multiplexes and transmits a plurality of GbE signals in comparison with an optical transponder that receives only one channel of GbE signals and transmits them through a WDM optical channel. Therefore, the present invention has a direct relationship with transmission capacity in a wavelength division multiplexing system. There is an effect that the optical channel (wavelength) can be used more efficiently.

In addition, the present invention can reduce the number of transponder units required by increasing the efficiency of the optical channel (wavelength) operation of the wavelength division multiplexing transmission system, thereby providing economic efficiency for equipment investment for the telecommunication service provider. .

1 is an exemplary view of a configuration of an optical transmission system to which the present invention is applied;

2 is an exemplary diagram of an optical transponder configuration for receiving a conventional GbE signal;

3 is a configuration diagram of an optical transponder using a gigabit Ethernet signal multiplexing apparatus according to the present invention;

4 is an exemplary diagram of an optical transponder for multiplexing two channels of 1.25 Gb / s GbE signal to 2.5 Gb / s signal according to the present invention;

5 is an exemplary diagram of an optical transponder for multiplexing an eight-channel 1.25Gb / s GbE signal into a 10Gb / s signal according to the present invention.

* Explanation of symbols for the main parts of the drawings

310: GbE optical transmitter 320: GbE signal multiplexer

330: SDH / SONET framer 340: CDR and SERDES section

350: Digital Wrapper

Claims (10)

In the optical transponder using a Gigabit Ethernet (GbE) signal multiplexing device, Optical transmission and reception means for converting a GbE optical signal into an electrical signal; Gigabit Ethernet signal multiplexing means for mapping photoelectrically converted multi-channel GbE electrical signals to SDH / SONET (Synchronous Digital Hierarchy / Synchronous Optical NETwork) frames; Synchronization fitting means for performing maintenance signal processing and pointer processing of the SDH / SONET frame; And Monitoring control means for controlling the respective functional means and monitoring their performance and alarms, The gigabit Ethernet signal multiplexing means, Parallelization means for parallelizing the GbE electrical signal transmitted from the optical transmission / reception means for converting a GbE optical signal into an electrical signal; 8B / 10B decoding means for decoding the electrical signal delivered from the parallelizing means; Signal monitoring means for detecting the presence or absence of an error by monitoring the Ethernet frame transmitted through decoding by the 8B / 10B decoding means; Packetization means for packetizing the Ethernet frame transmitted through the signal monitoring means to a predetermined size; And Concatenation means for performing a function of mapping the Ethernet frame packetized by the packetizing means into a virtual container which is a unit constituting an SDH / SONET frame. Optical transponder using a gigabit Ethernet signal multiplexing device comprising a. The method of claim 1, Digital wrapper means for remapping the mapped SDH / SONET frames to optical transport network (OTN) frames and inserting error correction (FEC) codes Optical transponder using a gigabit Ethernet signal multiplexing device further comprising. In Gigabit Ethernet (GbE) signal multiplexing device, Parallelization means for parallelizing the GbE electrical signal transmitted from the optical transmission / reception means for converting a GbE optical signal into an electrical signal; 8B / 10B decoding means for decoding the electrical signal delivered from the parallelizing means; Signal monitoring means for detecting the presence or absence of an error by monitoring the Ethernet frame transmitted through decoding by the 8B / 10B decoding means; Packetization means for packetizing the Ethernet frame transmitted through the signal monitoring means to a predetermined size; And Concatenation means for performing a function of mapping the Ethernet frame packetized by the packetizing means into a virtual container which is a unit constituting an SDH / SONET frame. Gigabit Ethernet signal multiplexing device comprising a. The method of claim 3, wherein The signal monitoring means, And a function of detecting whether a transmission error occurred in the signal transmitted through the 8B / 10B decoding means. The method of claim 3, wherein And monitoring the Ethernet frame by the signal monitoring means processes the data link layer (Layer 2) of the Open Systems Interconnection (OSI) 7 layer model. The method according to claim 1 or 2, The speed of the multiplexed GbE electrical signal is 1.25Gb / s, the number of channels is more than 2 channels, Gigabit Ethernet signal multiplexing device characterized in that the speed of Wavelength Division Multiplexing (WDM) optical channel is 2.5Gb / s Optical transponder using. The method according to claim 1 or 2, The speed of the multiplexed GbE electrical signal is 1.25Gb / s, the number of channels is 8 or more channels, the optical transponder using a Gigabit Ethernet signal multiplexing device, characterized in that the speed of the WDM optical channel is 10Gb / s. The method according to claim 1 or 2, The speed of the multiplexed GbE electrical signal is 10.3125 Gb / s, the number of channels is 4 or more channels, the optical transponder using a Gigabit Ethernet signal multiplexing device, characterized in that the speed of the WDM optical channel is 40Gb / s. The method of claim 7, wherein Instead of using 10Gb / s SDH (STM: Synchronous Transfer Mode-64) framers in optical transponders with 10Gb / s WDM fiber channel speeds, use four 2.5Gb / s SDH (STM-16) framers and 10Gb / s. An optical transponder using a Gigabit Ethernet signal multiplexer, characterized by using a digital wrapper that accepts four 2.5 Gb / s SDH (STM-16) signals instead of a digital wrapper that accepts s SDH (STM-64) signals. The method according to claim 1 or 2, An optical transponder using a gigabit Ethernet signal multiplexing device having a function of controlling traffic of GbE data through flow control with an external client system.