WO2003017543A1

WO2003017543A1 - Time-division multi-transfer method, apparatus, and system

Info

Publication number: WO2003017543A1
Application number: PCT/JP2002/005001
Authority: WO
Inventors: Akira Tosa
Original assignee: Allied-Telesis, K.K.
Priority date: 2001-08-10
Filing date: 2002-05-23
Publication date: 2003-02-27
Also published as: JP2003060603A

Abstract

Ethernet port data of a plurality of channels each consisting of communication data and control data is time-division-multiplexed (TDM) into a SONET/SDH frame and transmitted. Ethernet port data of each channel is successively read out on byte basis which is communication data or control data and a TDM frame is successively created for containing one byte of a plurality of channels. A plurality of TDM frames are contained in a payload region to create a SONET/SDH frame, which is transmitted via a SONET/SDH network.

Description

Description Time division multiplex transmission method, apparatus and system

The present invention relates to a technology for transmitting a plurality of Ethernet (registered trademark, hereinafter the same) signals by time division multiplexing (TDM), and more particularly to a system for multiplexing and transmitting a plurality of TDM frames into digital synchronous network frames. , Methods and apparatus. Background art

In recent years, data communication traffic has been increasing remarkably, and technology for economically and efficiently transmitting rapidly increasing traffic has become increasingly important. As such a transmission technology, a technology for connecting a gigabit Ethernet LAN using a synchronous optical network such as SONETZSDH has been proposed.

For example, Japanese Unexamined Patent Publication No. 2001-45069 states that a plurality of Gigabit Ethernet signals having a transmission rate of 1.25 Gbps are converted to 1 Gbps by 8B10B encoding conversion, respectively, and are converted to a payload area of an optical path signal. A time-division multiplexing transmission technique is disclosed.

However, the above-described Gigabit Ethernet time division multiplex transmission technology is based on the premise of Gigabit Ethernet signals, and is not a technology for multiplexing and transmitting conventional 1 OZl 00Mbps Ethernet signals. In addition, when multiplexing into optical path signals, it is necessary to convert the transmission speed of multiple Gigabit Ethernet signals from 1.25 Gb ps to IGb ps, and the receiving side converts the optical path signals into multiple Gigabit Ethernet signals. After separation into signals, it is necessary to reverse convert the transmission rate from 1 Gbps to 1.25 Gbps by 8B 10B coding conversion. As described above, in the conventional time division multiplex transmission technology, the system configuration is complicated, and Time-division multiplexing of 100/100 Mbps Ethernet signals could not be transmitted transparently.

An object of the present invention is to provide a time division multiplex transmission system, method and apparatus for transmitting a plurality of transmission signals transparently through a digital synchronization network by time division multiplex.

Another object of the present invention is to provide a time-division multiplexing transmission system, a method and an apparatus having a simple configuration for time-divisionally multiplexing a 100/100 Mbps Ethernet signal and transmitting the signals in a transparent manner. Disclosure of the invention

According to a first aspect of the present invention, a time division multiplex transmission device is a device for performing time division multiplexing (TDM) of transmission signals of a plurality of channels each composed of communication data and control data into a frame of a digital synchronous network and transmitting the signals. The transmission signal of each channel is sequentially read out for each data block of a predetermined length which is a difference between the communication data and the control data, and a TDM frame containing one data block of each of the plurality of channels is sequentially generated. A synchronous network frame generating means for storing a plurality of TDM frames in a payload area and generating a frame of the digital synchronous network.

The transmission signal of each channel is sequentially read out for each data block of a predetermined length, which is either communication data or control data, and a TDM frame containing one data block for each of the plurality of channels is sequentially generated and the payload area is generated. By accommodating the transmission signals, it becomes possible to transmit the exchanged transmission signals transparently through the digital synchronous network. In addition, when time-division multiplexing Ethernet packets, there is no need to use special data conversion, a bucket buffer, or the like as in the related art, and the configuration can be simplified.

According to a second aspect of the present invention, a time division multiplex transmission device A multi-channel physical layer device that connects to each other, and a multi-channel Ethernet signal is input in units of bytes to generate one time-division multiplexing (TDM) frame sequentially, and digitally synchronize multiple TDM frames. TDM assembling means for accommodating in a payload area of a frame of a network, synchronous network transmitting means for adding an overhead portion of a frame of a digital synchronous network in which the TDM frame is accommodated and transmitting the frame to the synchronous network. , And.

Preferably, the data for each of the plurality of channels includes Ethernet communication data and line control data, and a byte of an Ethernet signal included in the TDM frame is one of the communication data and the control data. Features. Further, the TDM frame has a control flag for each of the plurality of channels, and each control flag indicates whether the data byte of the corresponding channel is Ethernet communication data or line control data. desirable. With such a configuration, it becomes possible to transmit the 110 Mbps Ethernet signal transparently and with a simple system configuration through a digital synchronization network. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic block diagram of a time division multiplex transmission system according to the present invention,

Fig. 2 (A) is a format diagram showing the frame structure of the STM-16 generated by the TDIvL standing part, and (B) is the format of one TDM frame multiplexed in its payload area. (C) is a format diagram of the control field in the TDM frame.

Fig. 3 (A) shows an example of the relationship between byte control flags and Ethernet port data. (B) shows the time series of Ethernet port data time-division multiplexed into the payload for any channel. (C) is a control diagram It is a diagram showing an example of a bit definition of data,

FIG. 4 is a block diagram showing a functional configuration of one embodiment of the present invention, and FIG. 5 is a schematic diagram for specifically explaining an assembling / disassembling operation of the time division multiplexing method according to the present invention. It is. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a schematic block diagram of a time division multiplex transmission system according to the present invention. The transmitting side is provided with a TDM assembling unit 10 and a SONET SDH transmitting unit 102, and the receiving side is provided with a SONET / SDH receiving unit 103 and a TDM decomposing unit 104.

The TDM assembly unit 101 has m Ethernet ports corresponding to 100/100 Mb / s Ethernet of m channels (CH1 to CHm), respectively, and inputs the 100/100 Mb / s Ethernet signals of m channels, respectively. I do. As will be described later, m 100-Mbps Ethernet signals are time-division multiplexed in the payload area to assemble a frame corresponding to a predetermined SONET TZ SDH service. Upon input of this frame, the SONETZSDH transmission unit 102 generates a predetermined SONETZSDH frame and sends it out to the optical fiber.

The SONET / SDH receiver 103 receives the optical signal, and the TDM decomposer 104 converts the original m-channel 100/100 Mb ps Ethernet signal from the TDM frame time-division multiplexed into its payload area. To separate.

Next, as an example of the time division multiplex transmission according to the present invention, a 10 / l 00Mb ps Ethernet signal of 20 channels (CH0 to CHI9) is converted to a 2.4883 2Gb ps (OC-48 / STM- 16) SONET / A case where the data is multiplexed into an SDH frame and transmitted will be described.

Fig. 2 (A) is a format diagram showing the frame structure of STM-16 generated by the TDM assembling unit. FIG. 2 (C) is a format diagram of a control field in a TDM frame.

As shown in FIG. 2 (A), the STM-116 frame generated by the TDM assembling unit 101 is a standard format frame including a section overhead and a payload. However, since the operation on the original network is assumed here, only the frame synchronization bit pattern (Al, A2) for section overhead is inserted. In the payload, TDM frames of 24 bytes per slot are multiplexed for 1566 slots and transmitted.

As shown in Fig. 2 (B), the 24-byte TDM frame is composed of 4-byte control data (CNT1 to CNT4) and 20-byte Ethernet port data (CH0 to CH19). Become. In the 20-byte Ethernet port data, each byte corresponds to 20 channels CH0 to CH19. That is, the Ethernet channels CH0, CHI,... Shown in FIG. 1 correspond to the Ethernet port data CH0, CH1,.

In FIG. 2 (C), the last 20 bits of the 4-byte control data CNT1 to CNT4 are defined as byte control flags CO to C19. The byte control flags C0 to C19 correspond to the following Ethernet port data CH0 to CH19, respectively, and depend on whether the byte control flag is "1" (invalid) or "0" (valid). Indicate whether the corresponding Ethernet port data is control data or communication data. Here, the control data is a signal for transmitting the line state of the Ethernet or the like, and the communication data is a signal of the Ethernet frame. A specific example is shown in Fig. 3 (A).

FIG. 3 (A) is a diagram showing an example of a relationship between the byte control flag and the Ethernet port data. When the byte control flag is "1" (invalid), the Ethernet port data of the corresponding channel is the Ethernet control data (Contr). Here, channels CH2, CH3, CH5-CH6, etc. One Ethernet signal is control data. When the byte control flag is "0" (valid), the Ethernet port data of the corresponding channel is Ethernet frame data (D). Here, Ethernet signals of channels CHO, CH1, CH4, CH7, etc. are communication data.

Fig. 3 (B) is a schematic diagram in which Ethernet signals time-division multiplexed into a payload are arranged in time series for an arbitrary channel. In the example shown in FIG. 3 (B), communication data D :! to DEND corresponding to an Ethernet frame is transmitted on a certain channel CH i, followed by control data (Contr).

In this case, in the payload of Fig. 2 (A), the Ethernet port data corresponding to the channel CHi of a certain TDM frame is communication data D1, and the Ethernet port data corresponding to the same channel CHi of the subsequent TDM frame. The Ethernet frame is transmitted byte by byte as shown in communication data D2. Then, when the last communication data DEND of the concerned Ethernet frame is transmitted, the Ethernet port data corresponding to the channel CH i of the subsequent TDM frame becomes control data, and the control data is similarly transmitted sequentially until the next Ethernet frame. Is done.

FIG. 3 (C) is a diagram showing an example of a bit definition of control data. Here, in the 1-byte control data (Contr), the sixth bit is the presence / absence of collision detection (COL) in the Ethernet block, the third bit is the link status of the own channel PHY (PLC), and the second bit is the The duplex mode (PDM) of the channel physical layer device PHY, the first bit indicates the line speed (PLS) of the own channel physical layer device PHY, and the 0th bit indicates whether PA USE propagation in auto negotiation mode (PPA) is possible. .

(TDM assembly and disassembly equipment)

FIG. 4 is a block diagram showing a functional configuration of one embodiment of the present invention. The SON ETZSDH time division multiplex transmission device according to the present embodiment has 20 channels (CH It has 20 Ethernet function slices (CHO to CH19) respectively corresponding to 1 OZl 00Mb ps Ethernet of 1 to CH 19), Ethernet physical layer device (not shown) of each channel and MII (Media Independent) Interface).

The 20-channel Ethernet function slices (CH0 to CH19) are connected to the TDM assembling section 401 and the TDM decomposing section 402, and to the SONETZSDH transmitting section (not shown) via the TDM assembling section 401 and via the TDM decomposing section 402. Connected to S ONETZSDH receiver (not shown).

Each Ethernet function slice (CH0 to CH19) is provided with an SMI I (Serial Mix) 403 for connecting to the corresponding Ethernet physical layer device. The SMI 1403 receives the serial data E_RxD from the corresponding Ethernet physical layer device, converts it into parallel data, and sends it to the FIFO buffer 404. Conversely, the SMI I 403 receives parallel data from the FIFO buffer 405, converts the parallel data into serial data, and sends out the data as E-TxD to the corresponding Ethernet physical layer device. Further, the link control unit 406 is connected to the SMI I 403, and further connected to the TDM assembling unit 401, the TDM decomposing unit 402, and the MII management interface 407. All physical layer devices are controlled through the MII management interface 407. Further, the synchronization generation unit 408 generates a signal for synchronizing the SMI I 403 communicating in units of 10 bits.

Hereinafter, specific operations of the TDM assembling unit 401 and the disassembling unit 402 will be described with reference to FIGS.

(TDM assembly operation)

FIG. 5 is a schematic diagram for specifically explaining the assembling Z decomposition operation of the time division multiplexing method according to the present invention. Here, serial data from the Ethernet physical layer devices of channels CH0 to CH19 enter the Ethernet function slice. Shall be empowered.

First, the first byte of each channel is read from the FIFO buffer 404 into the TDM assembling unit 401, and a TDM frame (1) is generated. That is, since the first byte of channel CH0 is control data (Contr), the byte control flag of CH0 is invalidated to “1”, and the control data is transferred to channel CH0 of the Ethernet port data. Write to the location. Since the first byte of channel CH1 is communication data (D1), enable the byte control flag of CH1 to "0" and write the communication data D1 to the position of channel CH1 of the Ethernet port data. Thereafter, similarly, the data of channels CH2 to CH19 is written to generate a TDM frame (1).

Subsequently, the second byte of each channel is read from the FIFO buffer 404 into the TDM thread setting unit 401, and a TDM frame (2) is generated. That is, since the second byte of channel CH0 is communication data (D1), the byte control flag of CH0 is set to "0", and the communication data D1 is placed at the position of channel CH0 of the Ethernet port data. Write. Since the second byte of channel CH1 is communication data (D2), the byte control flag of CH1 is set to "0", and the communication data D2 is written to the position of channel CH1 in the Ethernet port data. Put in. Thereafter, similarly, the data of the channels CH2 to CH19 is written to generate the TDM frame (2).

The 24-byte TDM frames (1), (2)... Generated in this way are multiplexed in the payload area as shown in FIG. 2, and are transmitted from the SONE TZ SDH transmission unit to the STM— Sent as 16 frames.

(TDM decomposition operation)

It receives the STM-l 6 frames from SONET / ^/ SDH reception unit from its Pays port over de region of each 24 byte shown in FIG. 5 TDM frame (1), shall be sequentially read (2) · · · . First, the TDM decomposing unit 402 recognizes whether the following Ethernet port data is communication data or control data from the 20-bit byte control flag of the TDM frame (1). Here, since the byte control flag of channel CH0 is "1", it is determined that the data is control data, and the 1-byte Ethernet port data at the position of channel CHO is read as control data. Since the byte control flag of channel CH1 is "0", it is determined that the data is communication data, and the 1-byte Ethernet port data at the position of channel CH1 is read as communication data. Similarly, the first byte of the Ethernet port data of each channel is separated and read.

Subsequently, the TDM decomposing unit 402 recognizes from the 20-bit byte control flag of the TDM frame (2) whether the subsequent Ethernet port data is communication data or control data. Here, since the byte control flag of channel CHO is "0", it is determined that the data is communication data, and the 1-byte Ethernet port data at the position of channel CHO is read as communication data. Since the byte control flag of channel CH1 is also "0", it is determined that the data is communication data, and the 1-byte Ethernet port data at the position of channel CH1 is read as communication data. In the same manner, the second-byte Ethernet port data of each channel is separated and read.

In this way, the TDM frames in the payload area (1), (2) are separated into 20 channels of Ethernet signals, each of which is sequentially stored in the FIFO buffer 405, and serial data is transmitted through the SMI1 403. Send as E-TxD to the corresponding Ethernet physical layer device.

In the TDM assembling / disassembling apparatus shown in FIG. 4, the control data as shown in FIG. 3 (C) uses both the line status information on the SMI I 403 and the information from the MII management interface 407. Generated by Line status information on SMI I 403 is recognized when frame data is invalid They are "link state", "line speed", and "duplex mode", and the "PAUSE ability" is read from the MII management interface 407. “Presence / absence of collision detection” is determined by SMII 403 in the Ethernet function slice.

The time division multiplex transmission device shown in FIG. 4 can be formed as a chipset. The 20-channel Ethernet function slice (CHO to CH19), the TDM assembling section 401, and the TDM decomposition section 402 can be configured as a hardware circuit, but a program control processor such as a CPU can be used. By running the program on the above, the same function as software can be realized as a computer system. Such a program may be configured to realize the TDM assembling operation and the disassembling operation described above using an appropriate programming language. Further, such a program may be stored in various recording media in a computer-readable form. Of course, such a program can be transmitted through a communication line.

As described above in detail, according to the present invention, each of a plurality of transmission signals is sequentially read out for each data block of a predetermined length, which is one of communication data and control data, and each of the plurality of transmission signals accommodates one data block. TDM frames are sequentially generated and stored in the payload area of the digital synchronous network frame. This makes it possible to transmit a transmission signal carrying control data transparently through a digital synchronous network by utilizing the communication data of the Ethernet. Moreover, when time-division multiplexing Ethernet packets, special data conversion and bucket

There is no need to use such a method, and the configuration can be simplified.

Claims

The scope of the claims

1. An apparatus for transmitting a transmission signal of a plurality of channels composed of communication data and control data by time division multiplexing (TDM) to a frame of a digital synchronous network, and transmitting the transmission signal of each channel to the communication data or the control data. TDM frame generation means for sequentially reading out data blocks each having a predetermined length, and sequentially generating a TDM frame accommodating one data packet of each of the plurality of channels;

Synchronous network frame generating means for accommodating a plurality of TDM frames in a payload area and generating frames of the digital synchronous network;

A time division multiplex transmission device comprising:

2. A multi-channel physical layer device connecting each of a plurality of Ethernets (registered trademark),

TDM assembling means for inputting signals of a plurality of channels in units of bytes to sequentially generate one time division multiplexing (TDM) frame, and accommodating a plurality of TDM frames in a payload area of a frame of a digital synchronous network;

Synchronous network transmitting means for adding an overhead part of a frame of the digital synchronous network in which the TDM frame is accommodated and transmitting the frame to the synchronous network;

An Ethernet signal time division multiplex transmission device, comprising:

3. Each of the signals of the plurality of channels includes Ethernet communication data and line control data, and a byte included in the TDM frame is one of the communication data and control data. Item 3. An Ethernet signal time division multiplex transmission device according to item 2.

4. The TDM frame has a control flag for each of the plurality of channels, and each control flag indicates whether a byte of a signal of a corresponding channel is communication data or control data. The Ethernet signal according to claim 3 Time division multiplex transmission equipment.

5. In addition,

Synchronous network receiving means for receiving a frame of the digital synchronous network,

TDM demultiplexing means for separating the signals of the plurality of channels from the plurality of TDM frames contained in the payload area of the received frame,

3. The time-division multiplex transmission of an Ethernet signal according to claim 2, wherein

6. In a system that transmits multiple Ethernet signals via a digital synchronization network,

The sender is

A plurality of first physical layer devices that respectively connect the plurality of Ethernets; and a time division multiplexing (TDM) frame sequentially generated by inputting data from the plurality of first physical layer devices in units of bytes. TDM assembling means for accommodating a plurality of TDM frames in a payload area of a frame of a digital synchronous network, and adding an overhead portion of a frame of the digital synchronous network accommodating the TDM frames to achieve the synchronization. Synchronous network transmitting means for transmitting to the network;

Has,

The receiving side

TDM decomposing means for separating each of the plurality of Ethernet data from the plurality of TDM frames contained in the payload area of the received frame, and transmitting the plurality of Ethernet data to the corresponding Ethernet. A second physical layer device for

An Ethernet signal time division multiplex transmission system, comprising:

7. In a method of transmitting a transmission signal of a plurality of channels composed of communication data and control data by time division multiplexing (TDM) to a frame of a digital synchronous network, The transmission signal of each channel is sequentially read out for each data block of a predetermined length, which is a difference between the communication data and control data,

Generating one TDM frame accommodating one data block of each of the plurality of channels;

Generating and transmitting a frame of the digital synchronous network by accommodating a plurality of TDM frames in a payload area,

A time-division multiplexing transmission method comprising:

8. The time division multiplex transmission method according to claim 7, wherein each byte of the signal included in the TDM frame is one of the communication data and the control data.

9. The TDM frame has a control flag for each of the plurality of channels, and each control flag indicates whether a data byte of a corresponding channel is a difference between communication data and control data or a deviation. The time-division multiplexing transmission method according to claim する.

10. In a program for instructing a computer to transmit a multi-channel transmission signal consisting of communication data and control data by time division multiplexing (TDM) to a frame of a digital synchronous network,

A transmission signal of each channel is sequentially read out for each data block of a predetermined length, which is one of the communication data and the control data,

Sequentially generating TDM frames accommodating one data block of each of the plurality of channels,

Generating a frame of the digital synchronous network by storing a plurality of TDM frames in a payload area;

A time-division multiplex transmission program comprising steps.

1 1. A program for instructing a computer to transmit multi-channel signals by time-division multiplexing (TDM) on a frame of a digital synchronous network. And

The signals of the plurality of channels are input in units of bytes, and one time division multiplexing (TDM) frame is sequentially generated,

A plurality of TDM frames are accommodated in the payload area of the digital synchronous network frame,

Adding an overhead part of a frame of the digital synchronous network in which the TDM frame is accommodated,

Transmitting the frame of the digital synchronous network to the synchronous network;

A time-division multiplex transmission program comprising steps.

12. A computer system that executes time division multiplex transmission by the time division multiplex transmission program according to claim 10 or 11.

13 3. A program for instructing a computer to transmit multi-channel transmission signals consisting of communication data and control data in a time-division multiplexed (TDM) manner on a frame of a digital synchronous network is recorded. According to the recorded recording medium, the program:

A transmission signal of each channel is sequentially read out for each data block of a predetermined length, which is one of the communication data and control data,

Generating a frame of the digital synchronous network by storing a plurality of TDM frames in a pay-per-click area;

A recording medium comprising steps.