JP2003134139A - Transmission unit and transmission network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission network in which inter-group communications with high transmission efficiency can be performed. SOLUTION: A transmission unit is provided with: a group address storing part for storing the group address of one or a plurality of groups to which the transmission unit belongs; a unit address storing part for storing the transmission unit address; a header preparing part for preparing a header including a transmission source address field, a transmission destination address field and an identifier field for identifying whether a value set in the transmission destination address field is a group address or a unit address on the basis of addresses stored in the group address storing part and the unit address storing part; and a header analyzing part for deciding whether the transmission destination address field is a group address or a unit address according to the identifier field of the header of frame data and decides reception/relay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission unit for performing exchange processing between asynchronous frames and synchronous frames. In particular, the synchronous transfer mode (Synchro
The present invention relates to accommodation of asynchronous frames such as Ethernet (registered trademark) in a transmission device adopting the nous Transfer Mode (STM) method.

[0002]

2. Description of the Related Art Generally, asynchronous frame data such as Ethernet is accommodated in a LAN for communication between terminals. Ethernet frames are used as a method for expanding a communication area in a corporate network. ST
There is a method of accommodating in an M frame and transmitting.

FIG. 42 is a block diagram of a network that accommodates a conventional Ethernet. As shown in FIG. 42, the conventional network includes a plurality of terminals 8 # ij (i = 1 to 3, j = 1, 2) connected to the Ethernet and a plurality of child units 2 # i (i = 1 to 3). ), Relay units 4 # A, 4 #
B, parent unit 6, 0-system STM transmission line 3 # 0 and 1-system S
It is composed of the TM transmission line 3 # 1. Each child unit 2 # i
(I = 1 to 3) accommodates a plurality of terminals 8 # ij (j = 1, 2) for transmitting / receiving Ethernet frames. The band of the STM frame is assigned to each child unit 2 # i in advance.

FIG. 43 is a conventional STM frame structure diagram. As shown in FIG. 43, the STM frame is composed of an overhead (SOH) and a payload. As for the payload, a band (path #i) indicated by the head position and the transmission rate (the number of time slots) is assigned in advance to each child unit 2 # i (i = 1 to 3). For example, the child unit 2 # 1 has the band indicated by the path # 1, the child unit 2 # 2 has the band indicated by the path # 2, and the child unit 2
Bands indicated by path # 3 are allocated to # 3.

FIG. 44 is a block diagram of a conventional child unit 2 # i. The physical interface unit 10 # i is the terminal 8 # i.
0 from the Ethernet frame sent from j
It is output to the 1-system and 1-system transmission path inserting sections 12 # 0 and 12 # 1.
The transmission line inserting unit 12 # ij (j = 0, 1) receives the Ethernet frame from the physical interface unit 10 # i, and the Ethernet frame is assigned to the STM frame, which is indicated by the path #i in FIG. It is inserted into the band and output to TSW13 # ij (j = 0,1). TS
W13 # ij (j = 0, 1) is the STM transmission line 3 # j
(J = 0, 1) and the transmission path insertion unit 12 # ij (j = 0,
The STM frame is received from 1), multiplexed into the STM frame, and transmitted to the STM transmission line 3 # j (j = 0, 1).

Thus, for example, the terminal 8 # 3j (j =
The Ethernet frame transmitted from the first and second units 1 and 2) is inserted into the time slot corresponding to the path # 3 of the STM frame by the child unit 2 # 3, and the STM transmission line 3 # j (j =
0, 1). The STM frame transmitted from the child unit 2 # 3 is inserted into the path # 3 of the STM frame by the child unit 2 # 2. Also, the terminals 8 # 21, 8
The Ethernet frame transmitted from # 22 is inserted into the path # 2 of the STM frame by the child unit 2 # 2. Similarly, the Ethernet frames transmitted from the terminals 8 # 11 and 8 # 12 are inserted in the path # 1 of the STM frame. In this way, the terminal 8 # ij (i = 1 to 3,
The Ethernet frame transmitted from j = 1, 2) is
It is inserted in the path i (i = 1 to 3) of the STM frame.
The relay unit 4 # A uses the STM transmission line 3 # j (j = 0,
The STM frame is received from 1) and the STM frame is relayed to the STM transmission line 3 # j (j = 0, 1).

FIG. 46 is a block diagram of a conventional parent unit 6. The TSW 20 # j (j = 0, 1) is the STM transmission line 3 #
Receive the STM frame from j (j = 0,1) and output it to the transmission path extraction unit 24 # j (j = 0,1) connected to the output terminals corresponding to the paths # 1, # 2, and # 3. To do. The transmission path extraction unit 24 # j (j = 0, 1) uses the corresponding path #i (i
= 1 to 3), the data is extracted from the time slot accommodated in (1 to 3) and output to the system selecting unit 26. The system selection unit 26 is AC
The time slot data of each path #i (i = 1 to 3) output from the T-system 0-system transmission path extraction unit 24 # 0 or the 1-system transmission path extraction unit 24 # 1 is selected, and the Ethernet frame switch unit is selected. It is output to 20 corresponding terminals Pi (i = 1 to 3). The Ethernet frame switch unit 20 assembles the time slot data input from each input terminal Pi (i = 1 to 3) into an Ethernet frame. Then, from the MAC DA address of the header of the Ethernet frame, the output terminal Pi corresponding to the destination child unit 2 # i
(I = 1 to 3). Transmission line insertion unit 22 # j (j
= 0, 1) inserts the data output from each output terminal Pi (i = 1 to 3) of the Ethernet frame switch unit 20 into the corresponding STM frame, and the TSW20 # j (j
= 0, 1). TSW20 # j (j = 0,1)
Is an STM transmission line 3 # j that multiplexes the STM frame input from the transmission line insertion unit 22 # j (j = 0, 1).
Send to (j = 0,1).

The relay unit 4 # C is the STM transmission line 3 # j.
The STM frame is received from (j = 0, 1), and the STM frame is received.
It is transmitted to the transmission line 3 # j (j = 01,). Each child unit 2 # i (i = 1 to 3) has an STM transmission line 3 # j (j = 0,
1), the corresponding path #i (i = 1 to 1) of the STM frame
3) The time slot data inserted in 3) is assembled into an Ethernet frame, and the terminal 8 # ij (j = 1 to 1)
Send to 2). The terminal 8 # ij (j = 1 to 2) has the MAC DA address of the Ethernet frame of its own MA.
If it matches the C address, the Ethernet frame is received. As a result, the terminal 8 # ij and the terminal 8 # kl (i ≠
Communication between i) can be performed by Ethernet frame.

[0009]

However, the conventional network containing Ethernet has the following problems.

(1) The STM network is a completely synchronous network,
It is necessary for each child unit to predetermine a head position and a width for inserting and extracting data with respect to a time slot (bandwidth) determined in a fixed cycle. That is, it is necessary to construct a fixed path. Therefore, the bandwidth used by one unit cannot be used by another unit for another purpose. When Ethernet communication is performed between three or more units, a parent unit that has a role of cross-connecting (aggregating) paths from each child unit to other paths is required. In order for the parent unit to aggregate the paths of the child units, a transmission line insertion unit and a transmission line extraction unit are required for each path, and since the ports of the Ethernet frame switch unit increase as the number of paths increases, The circuit size becomes large, and the paths that can be aggregated in the parent unit are limited due to physical restrictions (circuit size, etc.). That is,
The number of child units that can communicate is limited. When communicating between more child units, it is necessary to increase the number of parent units and build a path between parent units. Therefore, the number of communication paths is limited due to the increase of the circuit scale, the path construction is complicated, the bandwidth for the number of paths is required, and the parent-child relationship is required for the unit, and the management by increasing the unit type is required. There are problems above.

(2) From the viewpoint of improving reliability, the STM transmission line has a double structure. However, the transmission side to the STM transmission line sends the STM frame accommodating the Ethernet frame transmitted from the accommodating terminal to the STM transmission line of 0 system and 1 system, and the reception side operates normally based on the alarm information of the transmission line. I am choosing a different route. However, switching is done only on a system-by-system basis, and frames are not selected / switched based on the distance of the source transmission unit, and even for the selected system, the frame of the route that passes through the circuit that makes a detour is selected. Even if the frame of the route passing through the close system happens to be selected and it is not necessary to switch, the frame of the route passing through the detour system is selected, and the delay becomes a problem.

The applicant applied for Japanese Patent Application No. 2000-230667 to solve the above-mentioned problem (1).
An object of the present invention is to improve and add the invention described in Japanese Patent Application No. 2000-230667 to provide efficient operation of a network and a transmission network with less delay.

[0013]

FIG. 1 shows the principle of the present invention. As shown in FIG. 1, the unit includes a group address storage unit 30, a unit address storage unit 32, a header creation unit 34, a frame data creation unit 36, and a data transmission unit 3.
8, a frame data receiver 40 and a header analyzer 42. The group address storage unit 30 stores the group address of one or a plurality of groups to which the own transmission unit belongs. The unit address storage unit 32 stores its own unit address. Upon receiving the frame transmitted from the terminal, the header creation unit 34, based on the addresses stored in the group address storage unit 30 and the unit address storage unit 32, a source address field, a destination address field, and a destination address field. A header including an identifier field for identifying whether the value set in the group address is a group address or a unit address is created. The frame data creation unit 36 creates frame data by adding the header to the frame transmitted from the terminal. The data transmission unit 38 maps the frame data into a synchronization frame and transmits it to the transmission path. As described above, since the group address field and the unit address field are not separately provided but distinguished by the identifier field, it is possible to suppress an increase in header length and suppress an increase in traffic.

On the other hand, the frame data receiving section 40 receives the synchronization frame from the transmission line and takes out the frame data mapped to the synchronization frame. Header analysis unit 4
2 determines whether the destination address field is a group address or a unit address from the identifier field of the header of the frame data extracted from the frame data receiving unit 40, and determines the source address, the own unit address, and the destination address. The reception / relay is judged by comparing with the self unit address or the self group address.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIG. 2 is a block diagram of a transmission network accommodating Ethernet according to a first embodiment of the present invention. In this embodiment,
It is applied to corporate networks. Further, the present invention can be applied not only to Ethernet but also to a network that accommodates asynchronous frames, but in the present embodiment, as an example, a network configuration that accommodates Ethernet frames is adopted.
As shown in FIG. 2, the transmission network includes a plurality of units 50 # i (i = 1 to 6) and an Ethernet cable 60.
#Ij (i = 1 to 6, j = 1, 2), 0-system transmission line 62 #
It is composed of the 0 and 1 system transmission lines 62 # 1. Each unit 50 # i has the following functions.

An own unit address and one or a plurality of group addresses to which it belongs are set from a management terminal (not shown) or the like. In this embodiment, the plurality of units 50 #
It is possible to define a plurality of groups composed of i (i = 1 to 6) and belong to one group or a plurality of groups. There is no particular limit to the number of groups that can be assigned. What is a unit address? Unit 50 #
It is an identifier uniquely assigned to i in the transmission network.

FIG. 3 is a diagram showing a group of transmission networks. As shown in FIG. 3, groups A, B, and C are defined in the transmission network. Group A
Is composed of units 50 # 1, 50 # 3, 50 # 4. Group B has units 50 # 1, 50 # 5, 5
0 # 6. Group C is unit 50 #
1, 50 # 2, 50 # 3. Unit 50
# 1 belongs to a plurality of groups A, B and C, and has unit 50
# 2 belongs only to group C, unit 50 # 3 belongs to two groups A and C, unit 50 # 4 belongs only to group A, and units 50 # 5 and 50 # 6 belong only to group B.

Ethernet cable 60 # ij (j
= 1, 2) connected to the terminal 52 # ijk (k = 1 to 1)
When the Ethernet frame sent from n) is received, the following processing is performed. (i) It is divided into fixed-length data, and a header such as control information described later is added to the fixed-length data to form a cell (IT (Integrated Transfer) cell). (ii) Insert an IT cell into any STM time slot in the common band. A common band is a plurality of units 50
#I (i = 1 to 6) accommodates the terminal 52 #ijk (i =
1 to 6, j = 1, 2, k = 1 to n) is a common band of all the units 50 # i (i = 1 to 6) allocated to transmit the Ethernet frame.

STM transmission line 62 # j (j = 0, 1)
The STM frame is received and the following processing is performed. (i)
For timeslots assigned to the common band,
From the header of the IT cell accommodated in the time slot,
Drop (reception) / discard is determined on the side of the relay / Ethernet cables 60 # i1 and 60 # i2 in accordance with the criteria described later. (i-1) When the IT cell is relayed, the cell is inserted in the common band of the STM frame, and the transmission path 62 # 0,
62 # 1. (i-2) When receiving the IT cell, the STM received from the transmission line 62 # j (j = 0, 1)
The IT cell extracted from the frame is decelled into a frame in which a header is added to the Ethernet frame (hereinafter, IT frame). For the same Ethernet frame of 0 system and 1 system, select the IT frame of one of the decellularized 0 and 1 system IT frames, remove the header from the selected IT frame, and add the necessary header part. Convert to Ethernet frame. Ethernet frame 60 # ij (j =
1) to 2).

Each terminal 52 # ijk has a MAC address and is accommodated in the unit 50 # i through the Ethernet cable 60 # ij. Ethernet cable 60
#Ij (i = 1 to 6, j = 1, 2) is a transmission medium for transmitting an Ethernet frame, and is 10BASE-5,
10BASE-2, 10BASE-T and the like. The number of Ethernet cables 60 # ij (j = 1, 2) accommodated in the units 50 # i (i = 1 to 4) is not particularly limited, but in the present embodiment, it is two. Transmission line 62 # j
(J = 0, 1) is a transmission medium that transmits the STM frame. The transmission path 62 # 0 is the 0-system, and the transmission path 62 # 1 is the 1-system.

FIG. 4 shows the unit 50 # i (i =
It is a block diagram of 1-4). As shown in FIG. 3, each unit 50 # i includes a transformer 70 # ij (j = 1, 2), a physical interface unit 72 # ij (j = 1, 2), an Ethernet switch unit 74 # i, and an Ethernet frame process. Section 78 # i, processor section 80 # i, boot ROM 8
2 # i, work RAM 84 # i, processor bus 86
#I, dual port RAM 90 for transmission #ij (j =
0, 1), cell conversion section 92 # ij (j = 0, 1), selection section 94 # ij (j = 0, 1), transmission control section 96 # ij (j
= 0, 1), relay buffer 98 # ij (j = 0,
1), STM frame insertion unit 100 # ij (j = 0,
1), band setting unit 102 # ij (j = 0, 1), STM
Frame extraction unit 104 # ij (j = 0,1), cell analysis unit 106 # ij (j = 0,1), decellization unit 108 # i
j (j = 0, 1), dual port RAM 110 for reception
#Ij (j = 0,1) and TSW112 # ij (j =
0, 1).

The transformer 70 # ij interfaces between the Ethernet cable 60 # ij and the physical interface unit 72 # ij. Physical interface unit 72 # i
j performs processing at the Ethernet frame level and checks the normality of the frame and the status of various alarms.
The Ethernet switch unit 74 # i uses the buffer 76 # i to switch the Ethernet frame. In this embodiment, the Ethernet switch unit 74 # i
Is switching 3 ports (A, B, C).

The Ethernet switch unit 74 # i is a hub that simply multiplexes Ethernet frames input from ports A and B and outputs them to port C, and multicasts the Ethernet frames input from port C to ports A and B. It may have a function. Further, the MAC SA address set in the Ethernet frame is stored, the MAC address of the terminal 52 # ijk to be accommodated is learned, and the terminal 52 # ijk (j = 1, 2, k = 1 to 1) is learned.
The Ethernet frame communicated between n) may have a bridge function of transmitting to the corresponding Ethernet cable 60 # ij without transmitting to the STM transmission lines 62 # 0 and 62 # 1.

The Ethernet frame processing unit 78 # i has an Ethernet frame interface function with the processor unit 80 # i. Ethernet switch unit 74
When the Ethernet frame is received from #i, the processor unit 80 # i is notified to request the reading of the frame. When the Ethernet frame is received from the processor 80 # i, the Ethernet switch 74 #
send to i.

FIG. 5 is a functional block diagram relating to Ethernet frame transmission of the processor section 80 # i in FIG. As shown in FIG. 5, the block related to the Ethernet frame transmission is the Ethernet frame receiving unit 120 #.
i, unit SA address acquisition unit 122 # i, group address acquisition unit 124 # i, unit DA address acquisition unit 128 # i, DA, SA, CNT addition unit 130 # i,
CRC adding unit 132 # i, 0-system writing unit 134 # i, 1-system writing unit 136 # i, unit SA address definition register 138 # i, group address definition register 140 # i
And unit DA address definition register 142 # i. The Ethernet frame receiving unit 120 # i receives the Ethernet frame from the Ethernet frame processing unit 78 # i.

FIG. 6 is a diagram showing an Ethernet frame, an IT frame, an IT cell and an STM frame. As shown in FIG. 6, the IT frame is composed of an Ethernet frame and a header part. Here, some header parts such as the preamble, SFD, etc. of the Ethernet frame are deleted from the IT frame, but since these are fixed values, these are deleted from the IT frame to efficiently transfer the Ethernet frame to the IT cell. This is because it is housed in. The IT frame is divided into fixed-length data and accommodated in an IT cell to which a header is added.

The header of the IT frame includes an address field composed of a unit DA and a unit SA, CNT,
It consists of LENGTH and HEC. The CNT, the unit DA, and the unit SA are set in the header of the IT cell that accommodates the IT frame. This is because it is necessary to determine the relay / reception / discard of the IT cell. Unit SA
Indicates the source unit address, which is required to control the revolving cell. The unit DA indicates a destination unit address / group address / broadcast address. The broadcast address is an address designated in the case of broadcast communication with all the units 50 # i (i = 1 to 6) as communication partners, and is ALL '1', for example. The CNT is control information for controlling the relay / reception of the Ethernet frame, and is composed of, for example, USD, DL, RE, GP. USD is a field indicating whether the IT frame is a valid frame or an invalid frame. For example, USD = '1' is a valid cell and USD = '0' is an invalid cell. DL indicates the number of cells in which the IT frame is accommodated. RE is a field for instructing whether the unit that has received the cell relays. For example, RE
If = '1', relay is performed even after receiving the cell. GP is D
This is a field indicating whether the A address field is a unit address or a group address.
LENGTH is a field that specifies the length of the IT frame. TIME is a field indicating time information. CRC is the CRC of the IT frame.

Unit SA address acquisition unit 1122 # i
Acquires its own unit address from the unit SA address definition register 138 # i. The own unit address is set by a management terminal (not shown). The group address acquisition unit 124 # i acquires a group address from the group address definition register 140 # i.
The unit DA address acquisition unit 128 # i is the unit D
The unit DA address is acquired from the destination MAC address of the Ethernet frame by referring to the A address definition register 142 # i.

The DA, SA, and CNT adding section 130 # i are
Perform the following processing. (i) Set the unit SA address in the unit DA address field. (ii) When performing inter-group communication, when the own unit belongs to a plurality of groups, the broadcast address (ALL'1 ') is set, and when the own unit belongs to a single group, the group address is set to the unit DA. (iii) In the case of point-to-point (PP) communication, the unit DA
Set the address in the DA address field. In addition, which communication between the group communication and the PP communication is performed is set by the system administrator during operation and stored in a register (not shown). (iv) USD = '1', DL = number of cells, RE = '1' if broadcast frame, RE = '0' if not broadcast frame,
If the DA address field is a group address / broadcast address, GP = '1', unit D
If it is an A address, GP = '0'.

The CRC adding section 132 # i calculates the CRC of the IT frame and sets the CRC at the end thereof.
The 0-system writing unit 134 # i0 writes the IT frame in the transmission dual-port RAM 90 # i0. 1-system writing unit 1
34 # i1 is a dual port R for transmitting an IT frame
Write to AM90 # i1. The unit SA address definition register 138 # i is a register that stores its own unit address. The unit SA address definition register 138 # i is a register for storing its own unit address.

FIG. 6 is a block diagram of the group address definition register 140 # i in the figure. As shown in FIG. 6, the group address definition register 140 # i stores the group address of one or more groups to which the own unit 50 # i belongs. The unit DA address definition register 142 # i is a register that stores the MAC address of the destination terminal and the unit address of the unit that accommodates the terminal, and is set by the management terminal or the like.

The boot ROM 82 # i shown in FIG. 4 is an RO for storing programs executed by the processor section 80 # i.
It is M. The work RAM 84 # i is a work RAM. The processor bus 86 # i includes a dual port RAM 90 # ij for transmission (j = 0, 1) and the like and a processor set 80 #.
It is a bus for connecting i. Dual port RAM for transmission
90 # ij (j = 0, 1) is a dual port RAM for accumulating IT frames. The dual port RAM is used so that writing from the processor unit 80 # i and reading from the cell assembling unit 92 # ij (j = 1, 2) can be performed at the same time.

The cell assembling section 92 # ij (j = 0, 1) performs the following processing. (i) When receiving the notification of writing the IT frame from the processor unit 80 # i, the IT frame is read from the dual port RAM 90 # ij for transmission (j = 0, 1). (ii) The read IT frame is divided into fixed lengths. (iii) Create an IT cell with a header added to each fixed length part. The cell header is, as shown in FIG. 6, a CNT field, a DA address field, an SA.
It is composed of an address field, a LIFE field and an HEC field. The CNT field, DA address field, and SA address field are the same as those of the IT frame header. For example, the maximum number of relays is set in the LIFE field. Unit 50 #
i (i = 1 to 4) decrements the value each time the IT cell is relayed. The IT cell is discarded when the relay is performed for a certain amount or more, for example, when the field value becomes 0. HEC is set in the HEC field. (iv) According to the instruction from the transmission control unit 96 # ij (j = 0,1), the IT cell is output to the selection unit 94 # ij (j = 0,1).

The selecting unit 94 # ij (j = 0,1) receives an instruction from the transmission control unit 96 # ij (j = 0,1), and the cell assembling unit 92 # ij (j = 0,1) or Relay buffer 9
The IT cell output from 8 # ij (j = 0, 1) is selected. If the transmission buffer 96 # ij (j = 0, 1) has an IT cell in the relay buffer 98 # ij (j = 0, 1), the transmission controller 96 # ij preferentially relays the buffer 98 # ij (j = 0, 1). 1)
IT cell is read from the relay buffer 98 # ij
If there is no IT cell at (j = 0,1), the cell assembling unit 92 is provided at the transmission dual port RAM 90 # ij (j = 0,1).
Instruct #ij (j = 0, 1) to output the IT cell.

STM frame inserting section 100 # ij (j =
0, 1), when the common band information, that is, the start address and band (number of time slots) of the STM frame is acquired from the band setting unit 102 # ij (j = 0, 1), the selecting unit 9
The IT cell output from 4 # ij (j = 0, 1) is inserted into the time slot designated by the bandwidth information at the bit rate indicated by the bandwidth to create the STM frame, and the TSW is generated.
112 # ij (j = 0, 1). Band setting unit 1
02 # ij (j = 0,1) is all terminals 52 # ijk (i =
Common band information for accommodating Ethernet frames 1 to 6, j = 1, 2, k = 1 to n) is output. STM
The frame extraction unit 104 # ij (j = 0,1) is TSW1.
The band setting unit 102 # ij (j = 0,1) receives the STM frame output from 12 # ij (j = 0,1).
The data of the common band set by is extracted.

FIG. 8 shows the cell analysis unit 106 # ij in FIG.
It is a block diagram of (j = 0, 1). As shown in FIG. 8, the cell analysis unit 106 # ij includes a cell input unit 150 # ij, a cell header extraction unit 152 # ij, and an HEC check unit 154.
#Ij, unit DA address determination unit 156 # ij, cell relay unit 158 # ij, and cell drop unit 160 # ij.
Have. The cell input unit 150 # ij inputs the IT cell from the STM frame extraction unit 104 # ij. The cell header extraction unit 152 # ij extracts a cell header. The HEC check unit 154 # ij calculates the HEC of the cell header and determines whether or not there is an HEC error.

FIG. 9 is a diagram showing criteria for receiving / relaying / discarding cells. The unit DA determination unit 156 # ij
IT cell reception / relaying / discarding is determined according to the determination criteria shown in FIG. (1) If USD = "0", the IT cell is discarded. (2) Discard the IT cell if the HEC error occurs. (3) If LIFE = '0', IT cell is discarded.
(4) If SA = unit address of the own unit 50 # i, since it is a revolving cell, the IT cell is discarded. (5) DA
If = 0, it is determined that the cell is invalid and the IT cell is discarded. (6) If USD = '1' and SA ≠ own unit address and GP = '0' and DA = own unit address and RE = '0' and LIFE ≠ '0', IT cell reception and relay are performed. Decide not to. (7)
USD = '1' and SA ≠ own unit address and GP
= '0' and DA = own unit address and RE = '
If 1'and LIFE ≠ '0', IT cell reception and relay are determined. (8) When USD = '1' and SA ≠ own unit address and GP = '0' and DA ≠ own unit address and RE = '0' and LIFE ≠ '0',
It is decided not to receive the IT cell and the relay of the IT cell. (9) USD = “1” and SA ≠ own unit address and GP = “0” and DA ≠ own unit address and R
When E = '1' and LIFE ≠ '0', it is determined that the IT cell is not received and relayed. (10) USD
= '1' and SA ≠ own unit address and GP = '
If 0'and DA = 0 or All'F 'and RE =' 0 'and LIFE ≠' 0 ', IT cell reception is determined. (11) USD = '1' and SA ≠ own unit address and GP = '0' and DA = 0 or All'F 'and R
If E = '1' and LIFE ≠ '0', IT cell reception and relay are determined. (12) USD = '1' and SA ≠
If the own unit address and GP = '1' and DA = 0 or All'F 'and LIFE ≠' 0 ', the IT cell is discarded because it is an invalid cell. (13) USD = '1' and SA
≠ own unit address and GP = '1', DA = own group address and RE = '0' and LIFE ≠ '0'
In case of, it is decided not to receive the IT cell and to relay it. (14) If USD = '1' and SA ≠ own unit address and GP = '0' and DA ≠ own group address and RE = '1' and LIFE ≠ '0', IT
Determines cell reception and relay. (15) USD = “1” and SA ≠ own unit address and GP = “1” and DA
≠ own group address and RE = '0' and LIFE
When ≠ '0', it is decided not to receive the IT cell and to relay it. (16) When USD = '1' and SA ≠ own unit address and GP = '1' and DA ≠ own group address and RE = '1' and LIFE ≠ '0', IT cell is not received and relayed Decide to do.

In the case of a relay cell, the cell relay unit 158 # ij decrements the LIFE field value of the relay cell by 1 and then updates the HEC, and the relay buffer 98 # ij.
Write the relay IT cell to ij. Cell drop section 160
#Ij outputs the IT cell to the decellizing unit 108 # ij. The decellization unit 108 # ij (j = 0,1) inputs the IT cell from the cell analysis unit 106 # ij (j = 0,1) and deletes the header of the IT cell. The IT frame is assembled according to the DL field of the header of the IT frame. The CRC check of the IT frame is performed, and if it is normal, the receiving dual port RAM 110 # ij (j =
Write the IT frame to 0, 1). When the writing is completed, the processor unit 80 # i is notified via the processor bus 86 # i.

Receiving dual port RAM 110 # ij
(J = 0, 1) is a dual port RAM that stores IT frames. The dual port RAM is used so that writing from the decellization unit 108 # ij (j = 0, 1) and reading from the processor unit 80 # i can be performed at the same time. TSW112 # ij (j =
0, 1) has the following functions. Transmission line 62 # j (j
= 0, 1), the STM frame is received and output to the STM frame extraction unit 104 # ij (j = 0, 1) and other band separation units. STM frame insertion unit 100 # i
common band data of the STM frame output from j (j = 0, 1) and data output from other band inserting units are multiplexed into the STM frame, and the transmission line 62 # j (j
= 0, 1).

The operation of the network shown in FIG. 2 will be described below.

(1) When P-P communication is performed P between the terminal 52 # 111 accommodated in the unit 50 # 1 and the terminal 52 # 311 accommodated in the unit 50 # 3.
A case will be described as an example where -P communication is performed. Terminal 52 # 111
Is the MAC SA address of its own terminal,
The MAC address of the terminal 52 # 311 is the MAC DA address, LENGTH, DATA, FCS, and Premb.
le, SFD, etc. are set in the Ethernet frame and transmitted to the Ethernet cable 60 # 11. When performing PP communication, the unit 50 # 1 is set to perform PP communication and the relationship between the MAC address and the unit address. The unit 50 # 1 receives the Ethernet frame sent from the terminal 52 # 11, and
= '0', SA = own unit address, DA = DAMA
Unit DA address corresponding to C address, LIFE
An IT frame having a header in which "etc." is set is created.
The IT frame is converted into an IT cell, and the STM frame accommodating the IT cell in the common band is transmitted to the transmission paths 62 # 0 and 62 # 1.

The unit 50 # 2 determines whether to receive / relay / discard the IT cell according to the above-mentioned criteria. Here, the DA unit address of the IT cell is unit 5
Since it is 0 # 3, the IT cell is relayed to the unit 50 # 3. The unit 50 # 3 determines reception / relay / discard of the IT cell according to the above-described determination criteria. Here, the DA unit address of the IT cell is the unit 50 #.
3, the IT cell is received, the IT cell is assembled into an Ethernet frame, and the Ethernet 60 # 31 is received.
Send to. The terminal 52 # 311 receives the Ethernet frame addressed to itself.

(2) In case of group communication Terminal 52 accommodated in unit # 4 belonging to group A
A case where # 411 performs group communication will be described as an example. The terminal 52 # 411 uses the MAC address of its own terminal as the MAC address.
The SA address, the MAC address of the terminal belonging to the group A, for example, the terminal 52 # 111 is the MAC DA address, LENGTH, DATA, FCS, and Preamble.
e, SFD, etc. are set in the Ethernet frame and transmitted to the Ethernet cable 60 # 41. When performing group communication, the unit 50 # 4 is set to perform group communication. The unit 50 # 4 is the terminal 5
2 # 411: Ethernet frame transmitted, GP = '1', SA address = own unit address, DA address = group address of group A to which own group belongs, IT frame having header with LIFE set To create. The IT frame is converted into an IT cell, and the STM frame accommodating the IT cell in the common band is transmitted to the transmission paths 62 # 0 and 62 # 1.

The unit 50 # 5 determines whether to receive / relay / discard the IT cell according to the above-mentioned criteria. Here, GP = '1', the DA address of the IT cell is the group address of the group A, and since the own unit does not belong to the group A, the IT cell is set to the unit 50 # 6.
Relay to. Unit 50 # 6 has GP = '1', IT
Since the DA address of the cell is the group address of group A and the own unit does not belong to group A, the IT
Relay the cell to unit 50 # 1. Unit 50 # 1
Since GP = '1', the DA address of the IT cell is the group address of group A, and the own unit belongs to group A, the IT cell is received and the terminal 52 #
1jk (j = 1, 2, k = 1 to n) (for example, DA
MAC address as broadcast address)
Assemble into an Ethernet frame. The Ethernet frame is transmitted to the Ethernets 60 # 11 and 60 # 12. Further, the IT cell is relayed to the unit 50 # 2. The terminal 52 # 1jk receives the Ethernet frame.

The unit 50 # 2 has GP = '1', IT
Since the DA address of the cell is the group address of group A and the own unit does not belong to group A, the I
Relay the T cell to unit 50 # 3. Unit 50 #
3 indicates that GP = '1', the DA unit address of the IT cell is the group address of the group A, and the own unit belongs to the group A, the IT cell is received,
It is assembled into an Ethernet frame addressed to the terminal 52 # 3jk (j = 1, 2, k = 1 to n) (for example, the DA MAC address is used as the broadcast address). Then, the Ethernet frame is transferred to the Ethernet 60 # 31,
60 # 32. The terminal 52 # 3jk receives the Ethernet frame. Further, the IT cell is relayed to the unit 50 # 4. The unit 50 # 4 determines that the IT cell is a revolving cell because the SA address of the IT cell is its own unit address, and discards the cell.

(3) In the case of broadcast communication The terminal 52 # 111 accommodated in the unit 50 # 1 belonging to the plurality of groups A, B, C uses the MAC address of its own terminal as the MAC SA address and the groups A, B, C. Of the terminal belonging to any of the above, for example, the MAC of the terminal 52 # 111
Address is MAC DA address, LENGTH, DA
Set TA, FCS, Preamble, SFD, etc. in the Ethernet frame, and use the Ethernet cable 60 #.
Send to 11. Unit 5 for group communication
Group communication is set to 0 # 1. When the unit 50 # 1 receives the Ethernet frame sent from the terminal 52 # 111, GP = '
1 ', SA address = own unit address, since own unit belongs to a plurality of groups A, B, C, D
A address = multicast address (ALL '
1 '), GE =' 1 ', LIFE, etc., and an IT frame having a header is set. The IT frame is converted into an IT cell, and the STM frame accommodating the IT cell in the common band is transmitted to the transmission paths 62 # 0 and 62 # 1.

The unit 50 # 2 has GP = '1', GE
= '1', since the DA address of the IT cell is the broadcast address, the IT cell is received and the terminal 5
2 # 2jk (j = 1, 2, k = 1 to n) (for example,
Assemble the Ethernet frame of the DA MAC address as the broadcast address). Then, the Ethernet frame is transferred to the Ethernet 60 # 21, 60 #.
22 to 22. The terminal 52 # 2jk receives the Ethernet frame. Further, the IT cell is relayed to the unit 50 # 3. Units 50 # 3, 50 # 4,5
0 # 5 and 50 # 6 receive the IT cell and set GP
= '1', GE = '1', the DA unit address of the IT cell is the broadcast address, so the IT
After receiving the cell, the terminal 52 # ijk (i = 3, 4, 5,
6, j = 1, 2, k = 1 to n) (for example, DA MA
(C address as broadcast address) is assembled into an Ethernet frame. Then, the Ethernet frame is transferred to the Ethernet 60 # i1, 60 # i2 (i =
3, 4, 5, 6). Terminal 52 # ijk (i =
3, 4, 5, 6) receive the Ethernet frame.

As described above, according to the first embodiment, by setting either the group address or the unit address in the GP field, the inter-group communication and the PP communication can be performed. Furthermore, it is possible to define a plurality of groups, and a plurality of VLANs can be configured.

Second Embodiment FIG. 10 is a block diagram of a transmission network accommodating Ethernet according to the first embodiment of the present invention. The same reference numerals are given to substantially the same components as those in FIG. Attached. The unit 200 # i is the unit 50 # in FIG.
It is different from i in the following points. (i) The unit address must be unique within the group. (ii) The address field is divided into a group address field and a unit address field.

FIG. 11 is a block diagram of the address field. As shown in FIG. 11, the address field of the header of the IT frame is a group SA address field, a unit SA address field, a DA group address field, and a DA unit address field. This is to increase the variation of communication modes.

(Iii) The address field has a fixed length, but the group SA address field and unit SA
The address field, the group DA address field, and the unit DA address field have variable lengths. This is because the number of groups and the number of units in the group defined in the transmission network for the group address and the unit address are made variable, and the address field length is suppressed to efficiently express the address. (iv) The lengths of the group address and unit address are specified by the address space variable specification bits.

FIG. 12 is a diagram showing an example of address space variable designation bits. As shown in FIG. 12, the address field includes a group address field and a unique address field. For example, when the address field is composed of 10 bits, when the group address is 4 bits and the unique address field is 6 bits, the address space variable designation bit = '11110
It becomes 00000 '. In this case, the maximum number of groups is 15
Up to individual items can be defined. Up to 63 units can be defined.

(V) In-group 1: 1 communication, in-group all-broadcast communication, each group-unit communication, and all-broadcast communication are possible. Within group 1:
One communication refers to PP communication. All broadcast communication within a group refers to communication between groups. All-broadcast communication refers to broadcast communication. Each group unit communication is to communicate with a unit of a certain unit address in all groups. (vi) The RE field and GE field of the IT frame header are abolished. This is because various communication modes shown in (v) can be designated by the new address field.

FIG. 13 is a diagram showing a group address and a unit address of the transmission network. As shown in FIG. 13, two groups A to B are defined in the transmission network. Units 200 # 1, 200 # 3
Three units of 200 # 4 belong to group A. Three units 200 # 2, 200 # 5, 200 # 6 belong to the group B. The group address is 4 bits, the unit address is 6 bits, and the address space variable designation setting bit = '1111000000'. The group address of group A is '1110',
The unit address of the unit 200 # 1 is' 00000
It becomes 1 '. For example, unit 200 # 1 is unit 2
When performing P-P communication with 00 # 3, intra-group one-to-one communication can be performed by setting '1110000001' in the DA address field.

FIG. 14 shows the unit 200 # i in FIG.
It is a block diagram of (i = 1-4), and the same code | symbol is attached | subjected to the substantially same component as the component of FIG. Figure 1
5 is a functional block diagram related to the Ethernet frame transmission of the processor unit 210 # i in FIG. 14, and the substantially same constituent elements as those in FIG. 5 are designated by the same reference numerals. The DA, SA, and CNT addition unit 230 # i
It has the following functions. The bit lengths of the group address field and the unit address field are determined by referring to the address space variable designation register 222. I
The following is set in the address field of the T frame header. (i) In the case of 1: 1 communication within a group, the group address to which the own unit belongs to the group SA address field, the own unit address to the unit SA address field, the group address to which the own unit belongs to the group DA address field, and the unit DA address field Set the unit address of the other party. (ii) In the case of all broadcasts in the group, the group address to which the own unit belongs in the group SA address field, the own unit address in the unit SA address field,
A group address to which the own unit belongs is set in the group DA address field and ALL'1 'is set in the unit DA address field. (iii) When addressed to the unit of each group, the group address to which the self unit belongs in the group SA address field, the unit address of the self unit in the SA unit address field, ALL'1 'in the group DA address field, unit DA
Set the other unit's address in the address field. (iv) Group SA for all broadcast communication
Group address to which own unit belongs in address field, unit address of own unit in unit SA address field, ALL '1' in group DA address field, AL in unit DA address field
Set L'1 '. USD in the IT frame header,
Set LIFE etc. The address space variable designation register 222 stores address space variable designation bits.

The cell analysis section 212 # ij (j =
0, 1) has the following functions. The group address field length and the unit address field length are determined from the address space variable designation bit pattern. FIG. 16 is a diagram showing the criteria for receiving / relaying / discarding cells, and the cell's reception / relaying / discarding is determined as follows according to the criteria shown in FIG. (1) If it is an HEC error, discard it. (2) If USD = '0' and HEC is normal, it is discarded as an idle cell. (3) USD = '
If 1'and LIFE = '0', it is discarded as a life cell. (4) If USD = '1' and LIFE = '1', it is determined as a semi-life cell and not relayed. A semi-life cell is a cell with LIFE = 1. LIFE is decremented each time a unit is relayed, and when a cell with LIFE = 1 is received, LIFE =
Although the cell is relayed by subtracting to 0, the adjacent unit receiving LIFE = 0 has LIFE = 0 = lifetime cell (reception discard operation), so the relay processing of the unit receiving LIFE = 1 is useless. Therefore, the relay operation is not performed when LIFE = 1 is received.

(5) USD = '1', group SA address = '0', unit SA address = '0' and L
If IFE> 0, it is an invalid address and is discarded.
(6) USD = '1' and group SA address = AL
If L'1 'and LIFE> 0, the address is invalid and is discarded. (7) If USD = '1' and unit SA address = ALL'1 'and LIFE> 0, it is an invalid address and is discarded. (8) If USD = '1', the group SA address is its own group, the unit SA address is its own station, the group DA address is '0', and the unit DA address is '0', it is a revolving cell and is discarded. (9) If USD = '1' and the group SA address is another group and the unit SA address is another station, group DA address and unit DA address = '0', it is an invalid address and is discarded.

(10) If USD = '1', the group SA address is another group, the unit SA address is another station, the group DA address is another group, and LIFE> 1, it is determined not to receive and relay. (1
1) If USD = '1', group SA address is another group, unit SA address is another station, group DA address is own group, unit DA address is own station and LIFE> 0, PP communication (own station) Therefore, it is decided to receive and not relay. (12) USD
= '1', group SA address is another group, unit SA address is another station, group DA address is own group, unit DA address is another station, LIF
If E> 1, since it is PP communication (other station), it is decided not to receive and to relay. (13) USD = '1'
And the group SA address is another group and unit S
A address is another station, group DA address is own group, unit DA address is ALL'1 'and LIF
If E = 1, it means broadcast communication, but LIF
Since E = '1', it is determined to receive and not relay.

(14) If USD = '1', the group SA address is another group, the unit SA address is another station, the group DA address is its own group, the unit DA address is ALL'1 ', and LIFE> 1, broadcast communication is performed. Therefore, it is decided to receive and relay. (15) USD = '1', group SA address is another group, unit SA address is another station, group DA address = ALL'1 'and unit D
If the A address is its own station and LIFE = 1, it is a group broadcast communication, but since LIFE = 1, it is decided to receive and not relay. (16) USD
= '1', group SA address is another group, unit SA address is another station, group DA address =
ALL '1' and unit DA address is own station and LI
If FE> 1, since it is group broadcast communication, it is decided to receive and relay. (17)
If USD = '1', the group SA address is another group, the unit SA address is another station, the group DA address = ALL'1 ', the unit DA address is another station, and LIFE> 1, then group broadcast communication (other station) is performed. Therefore, it is decided not to receive and to relay. (18) USD = '1', group SA address is another group, unit SA address is another station, group DA address = ALL'1 'and unit DA
If address = ALL'1 'and LIFE = 1, all broadcast communication is performed, but since LIFE = 1, it is determined to receive and not relay.

The operation of FIG. 2 will be described below.

(1) In the case of intra-group PP communication: Group A with a group address of "1110", unit 200 # 1 with a unit address of "000001" to unit 20 with a unit address of "000010"
When performing P-P communication with 0 # 3, the unit 200
# 1 is the group SA address = 'in the IT cell header
1110 ', unit SA address =' 00000
1 ', group DA address =' 1110 ', unit DA address =' 000010 ', etc. are set and transmitted to the unit 200 # 2. Since the unit 200 # 2 is not a cell addressed to its own station, the unit 200 # 2 sets the IT cell to the unit 200 # 2.
Relay to # 3. Since the unit 200 # 3 is a cell addressed to itself, it receives the cell but does not relay it.

(2) For out-of-group P-P communication From group A with group address "1110", unit 200 # 1 with unit address "000001" to group B with group address "1100", unit address is '000010' unit 200 #
When performing P-P communication with the unit 5, the unit 200 # 1
Shows the group SA address = '11 in the IT cell header.
10 ', unit SA address =' 000001 ', group DA address =' 1100 ', unit DA address =' 000010 ', etc.
Send to # 2. The unit 200 # 2 relays the IT cell to the unit 200 # 3 according to the above-mentioned determination criteria. Since the unit 200 # 3 is an IT cell addressed to another station, it is relayed to the unit 200 # 4. Unit 200
# 4 relays the IT cell to the unit 200 # 5. The unit 200 # 5 sends an I to its own station of the own group.
Receives T cells but does not relay.

(3) In-group broadcast communication When the group A having a group address of "1110" and the unit 200 # 1 having a unit address of "000001" perform in-group broadcast communication, the unit 200 # 1 has an IT cell header. Group SA address = '1110', unit SA address = '0000
01 ', group DA address =' 1100 ', unit DA address = ALL'1', etc. are set and transmitted to the unit 200 # 2. The unit 200 # 2 relays the IT cell to the unit 200 # 3 because the unit 200 # 2 is broadcast communication in another group. Unit 200 #
3 is broadcast communication within its own group, so IT
The cell is received and relayed to the unit 200 # 4.
The unit 200 # 4 receives the IT cell as well as the unit 20 # 4 because it is the broadcast communication within its own group.
Relay to 0 # 5. The unit 200 # 5 relays the IT cell to the unit 200 # 6 because it is a broadcast communication in another group. Unit 200 # 6
Is a broadcast communication in another group, so
The IT cell is relayed to the unit 200 # 1. Since the unit 200 # 1 is a revolving cell, it is discarded.

(4) In the case of unit communication of each group, the group A having the group address "1110" and the unit 200 # 1 having the unit address "000001"
However, when performing unit communication to the unit whose unit address is '000010', the unit 200 # 1 is
Group SA address = '1110' in the cell header,
Unit SA address = '000001', Group D
A address = ALL'1 ', unit DA address ='
0000 'and the like are set and transmitted to the unit 200 # 2. Since the unit 200 # 2 is not a cell addressed to its own station, the IT cell is relayed to the unit 200 # 3. Since the unit 200 # 3 is a cell addressed to its own station, I
The T cell is received and relayed to the unit 200 # 4. Since the unit 200 # 4 is a cell addressed to another station, I
Relay the T cell to unit 200 # 5. Unit 20
Since 0 # 5 is a cell addressed to its own station, it receives the IT cell and relays it to the unit 200 # 6. Since the unit 200 # 6 is a cell addressed to another station, the IT cell is relayed to the unit 200 # 5. Since the unit 200 # 1 is a revolving cell, it is discarded.

(5) In the case of all-broadcast communication When the unit 200 # 1 of the unit address of the group A whose group address is "1110" is "000001", all-broadcast communication is performed.
1 is the group SA address = '1 in the IT cell header
110 ', unit SA address =' 000001 ',
Group DA address = ALL'1 ', unit DA address = ALL'1', etc. are set, and unit 200 #
Send to 2. Since the unit 200 # 2 is all broadcast communication, it receives the IT cell and relays it to the unit 200 # 3. Unit 200 # 3 is
Since it is all broadcast communication, the IT cell is received and relayed to the unit 200 # 4. Since the unit 200 # 4 is all broadcast communication, it receives the IT cell and relays it to the unit 200 # 5. Since the unit 200 # 5 is all broadcast communication, the unit 200 # 5 receives the IT cell and the unit 2
Relay to 00 # 6. Since the unit 200 # 6 is all broadcast communication, it receives the IT cell and relays it to the unit 200 # 1. Unit 200 #
Since 1 is a circulating cell, the IT cell is discarded.

According to the second embodiment described above, by making the group address field and the unit address field variable, it is possible to set the group address field length and the unit address field length according to the operation. Can be effectively used, and an increase in traffic can be suppressed. Communication of various communication forms such as PP communication, group-to-group broadcast communication, and all-broadcast communication can be performed without using the RE field and the GP field.

Third Embodiment FIG. 17 is a block diagram of a transmission network accommodating an Ethernet according to a third embodiment of the present invention. The same reference numerals are given to substantially the same components as those in FIG. Attached. In the second embodiment, in the broadcast communication, it was not possible to exclude all the units as communication targets and exclude a specific group from communication targets. However, in the operation, inter-group communication between a certain group and another group is not possible. You may want to limit it. Therefore, the present embodiment provides a filtering function that limits inter-group communication between a certain group and another group.

FIG. 18 is a diagram showing the filtering function. As shown in FIG. 18, in the transmission network, the address space variable designation bit is '1110000000', the group address is 3 bits, and the unit address is 7 bits. Unit 250 # 1, Unit 250
# 4 belongs to groups A and B. Unit 250 # 2
250 # 3 belongs to group A. Unit 250 # 5
Belong to group B. The unit 250 # 6 belongs to the group C. Units 250 # 1, 250 # 4 want to perform intergroup communication with groups A and B, but do not want to perform intergroup communication with group C.
# 1 and 250 # 4 designate the broadcast communication in the address DA field, but the unit 250 # 6 belonging to the group C is equipped with a reception filtering function so as not to receive the broadcasts from the groups A and B. , B can perform inter-group communication only.

FIG. 19 shows the unit 250 # i in FIG.
It is a block diagram of (i = 1-4), and the same code | symbol is attached | subjected to the substantially same component as the component in a figure. Filtering section 260 # ij (j = 0, 1) has the following functions. It has a filter rig register in which a group address which is set by a management terminal (not shown) and which does not perform communication is stored. For example, the unit 250 in FIG.
In the filtering register # 6, the group address “001” of the group A and the group address “010” of the group B are stored. IT cell group DA
When the address field and the unit DA address field indicate broadcast communication, the IT cell is not received when the group SA address of the IT cell is registered in the filtering register, and the IT cell is received when the group SA address of the IT cell is not registered. .

The operation of FIG. 19 will be described below.

Unit 250 # belonging to groups A and B
When group 1 performs group-to-group communication between groups A and B, unit 250 # 1 adds group SA to the IT cell header.
Address is group address of group A / B, unit SA address = '0000001', group DA address = ALL'1 ', unit DA address = AL
L'1 'and the like are set and transmitted to the unit 200 # 2. Since the unit 200 # 2 is all broadcast communication and the group address is not set in the filtering register, the unit 200 # 2 receives the IT cell and relays it to the unit 250 # 3. Unit 250 # 3
Is all broadcast communication, and since the group address is not set in the filtering register,
The IT cell is received and relayed to the unit 200 # 4. Since the unit 200 # 4 is all broadcast communication and the group address is not set in the filtering register, the unit 200 # 4 receives the IT cell and relays it to the unit 200 # 5. Unit 200 #
Since 5 is all broadcast communication and no group address is set in the filtering register,
The IT cell is received and relayed to the unit 200 # 6. The unit 200 # 6 is all broadcast communication, but the group A / group which is the group SA address.
Since the group address of B is stored in the filtering register, the IT cell is not received. According to the embodiment described above, by using the filtering function, it is possible to perform inter-group communication between desired plural groups.

Fourth Embodiment FIG. 20 is a block diagram of a transmission network accommodating Ethernet according to a fourth embodiment of the present invention. The same reference numerals are given to substantially the same components as those in FIG. Attached. In the present embodiment, the entire bandwidth of the Ethernet frame flowing on the transmission network is determined as a common bandwidth, but the unit 300 # i uses it to accommodate the Ethernet frames transmitted by the terminal 52 # ijk without limitation. If you do, another unit 300 # l
The Ethernet frame transmitted by the terminal 52 # ljk accommodated by (l ≠ i) cannot be accommodated in the common band. Therefore, in the present embodiment, each unit 300 # i
Is allocated in advance, and each unit 300 # i performs flow control when there is traffic exceeding the allowable band from the terminal 52 # ijk.

FIG. 21 is a diagram showing allocation of a common band. STM overall bandwidth is 150 Mbps, common bandwidth is 1
00 Mbps, other bands (telephone etc.) 50 Mbps
Then, as the allowable band, 1 is set to the unit 300 # 1.
0 Mbps, 20 Mbps for unit 300 # 2, 30 Mbps for unit 300 # 3, 10 Mbps for unit 300 # 4, 10 Mbps for unit 300 # 5, and 20 Mbps for unit 300 # 6. However, 100 Mbps = 10 Mbps + 20 Mbp
s + 30 Mbps + 10 Mbps + 10 Mbps + 20
Mbps.

FIG. 22 shows the unit 300 # i in FIG.
It is a block diagram of (i = 1-4), and the same code | symbol is attached | subjected to the substantially same component as the component in FIG. When the traffic of the Ethernet frame transmitted from the terminal 52 # ijk exceeds the allowable band, the inflow amount limiting function unit 312 # i transmits a back pressure signal so as not to transmit the Ethernet frame to the terminal 52 # ijk, thereby performing flow control. I do.

FIG. 23 shows an inflow quantity limiting function unit 3 in FIG.
It is a block diagram of 12 # i. As shown in FIG. 23, the inflow amount limiting function unit 312 # i includes the inflow amount limiting threshold setting unit 318.
#I, inflow monitoring counter 320 #i, transmission stop unit 32
2 # i, flow control unit 324 # i, and selector 326 #.
have i.

FIG. 24 is a diagram showing the inflow amount limit threshold setting unit 318 # i in FIG. As illustrated in FIG. 24, the inflow amount threshold value setting unit 318 # i stores a subtraction timer value (monitoring section), a register value, and a band setting value.
The subtraction timer value is a monitoring section in which the frame length (unit byte) corresponding to the bandwidth in the monitoring section is subtracted, and 1
6.384 ms. The register value is a value corresponding to the permitted band, and is, for example, 0: inflow amount limitation disable (inflow amount is not monitored), 1 to 100 (unit: Mbp).
Values up to s) are set. The band setting value is a frame length (unit byte) corresponding to the permitted band in the monitoring section, and is a register value × 2048. 2048 is 1 Mb in this monitoring section when the monitoring section is 16.384 ms.
It is a byte length when a frame flows in at a transmission rate of ps.

The inflow monitor counter 320 # i has the following functions. Every time an Ethernet frame is input, the frame length is added to the inflow counter. The bandwidth setting value is subtracted from the inflow amount counter for each monitoring section. When the inflow amount counter exceeds the band setting value, the inflow amount excess signal is activated and output to the transmission stop unit 322 # i. When the inflow amount counter falls below the band setting value, the inflow amount excess signal is made inactive. The transmission stop unit 322 # i has the following functions. When the inflow amount excess signal becomes active, the Ethernet data output stop control frame generation request signal (stop request signal) is output to the flow control unit 324 # i and the selector 326 # i. When the inflow amount excess signal becomes inactive, the inflow amount restriction release signal control frame generation request signal (release request signal) is sent to the flow control unit 324 #.
i and the selector 326 # i. When the inflow excess signal does not change to active and inactive,
Nothing is output.

The flow controller 324 # i has the following functions. When the stop request signal is input, the IEEE802.
According to the X flow control, an Ethernet data output stop on control frame is generated. When the cancellation request signal is input, the IEEE802. An Ethernet data output stop control frame is generated according to the X flow control. The selector 326 # i has the following functions. When the stop request signal and the release request signal are not input, the Ethernet frame output from the Ethernet frame processing unit 78 # i is selected. When the stop request signal is input, the Ethernet data output stop on control frame output from the flow control unit 324 # i is selected. When the release request signal is input, the Ethernet data output stop on control frame output from the flow control unit 324 # i is selected.

The figure is a time chart of flow control.
The case where the allowable band is 1M is shown. At time t1, when the inflow amount monitoring counter value is 0 and the frame data of the frame length 500 is input, the inflow amount counter value = 500. At the time t2, when the monitoring section elapses, the inflow amount counter value-4086 is performed and (inflow amount value counter-4086) <0. Therefore, the inflow amount counter value = 0. Inflow amount counter value at time t4 =
It will be 1000. Inflow amount counter value = 25 at time t5
It becomes 00. At time t6, the inflow amount counter value = 452. At time t7, the inflow amount counter value = 1952.

At time t8, the inflow amount counter value = 3452
Becomes At this time, since the inflow amount counter value> 4086, the inflow amount excess signal is activated. As a result, the Ethernet data output stop on control frame sent to the terminal 52 # ijk side is transmitted, and the terminal 52 # ij
k stops sending Ethernet frames. Time t9
Then, the inflow amount counter value = 1404, and the inflow amount excess signal is made inactive. As a result, the terminal 52 # i
The Ethernet data output stop off control frame sent to the jk side is transmitted, and the terminal 52 # ijk releases the stop of the Ethernet frame transmission. In this way, the band of each unit 300 # i is controlled so as not to exceed the permitted band. As described above, according to this embodiment,
Since the bandwidth control is performed by each unit, the permitted bandwidth of each unit is guaranteed.

Fifth Embodiment FIG. 26 is a block diagram of a transmission network accommodating Ethernet according to a fifth embodiment of the present invention, in which the components substantially the same as those in FIG. Attached. In a transmission network, it is desirable to reduce transmission delay and perform high-speed communication. On the other hand, the transmission network has a duplex structure from the viewpoint of improving reliability. Conventionally, each unit transmits and receives frames in the clockwise / counterclockwise direction determined by the transmission network. When each unit receives a frame, each source unit must receive from the transmission direction with less delay. I can't
Frame delay was a problem. Therefore, in the present embodiment, in each unit 400 # i, the IT cell is selected from the transmission direction with less delay for each unit 400 # j that is the transmission source.

The unit 400 # i includes the 0-system transmission line 62 #.
It has the following functions related to the selection of the cell received from the 0, 1 system transmission path 62 # 1. Each unit 400 # j (j ≠
For each i), a route with a small delay is measured in advance and the corresponding transmission path 62 # 0 or 62 # 1 is selected. The following methods can be considered as system selection methods. (i) Unit 40
The request packet is broadcast from 0 # i. (ii)
When the unit 400 # j receives the request packet, it returns a response packet. (iii) For each unit 400 # j, a system in which the response packet arrives early or a system in which the number of times the response packet is relayed is small (a system in which the LIFE value is large) is selected. The unit SA address is I of the unit 400 # j
For T cells, receive cells from the selected system for unit 400 # j. Failure related to the unit 400 # j, for example, when the unit SA address of the cell in which the HEC error of the cell is detected is the unit address of the unit 400 # j, the system for receiving the cell having the unit SA address of the unit 400 # j Switch. For IT cells with other unit SA addresses,
Do not switch the receiving system.

FIG. 27 shows the unit 400 # i in FIG.
It is a block diagram of (i = 1-6), and the same code | symbol is attached | subjected to the substantially same component as the component in FIG. The unit 400 # i includes a control frame transmission buffer 412 # i, an Ethernet frame buffer 414 # i, a MUX 416 # i, and D in addition to the components of the unit in FIG.
MUX 418 # i, route selection table 420 # i, route selection unit 422 # i, control frame reception buffer 424 #
i and an Ethernet frame buffer 426 # i. Since control frames such as request packets and response packets are necessary for route control, in this embodiment, I
A field for distinguishing a control frame from an Ethernet frame is provided in the T frame header.

FIG. 28 is a diagram showing a format of an Ethernet frame and cell data. As shown in FIG. 28, FTPY is added to the CNT field of the IT frame header.
E field is added. The FTYPE field identifies a control frame such as a request packet or a response packet and an Ethernet frame packet. For example, FTYPE = '0' for a control frame and FTYPE = '1' for an Ethernet frame. .

The processor section 410 # i has the following functions. A control frame is set in which its own unit address is set in the SA address field, a broadcast address is set in the DA address field, a control frame is set in FTYPE, and a request packet is set in the DATA section, and is written in the control frame transmission buffer 412 # i. .
Write the Ethernet frame to the Ethernet frame buffer 414 # i. The response packet is read from the control frame reception buffer 424 # i, and it is judged for each unit 400 # j (j ≠ i) whether the system to which the response packet arrives earlier is the 0 system / 1 system, The system that has reached the area corresponding to the unit address of the unit 400 # j in the route selection table 420 # i earlier is written as route information. When a failure related to the unit 400 # j is notified, for example, when the HEC error of the IT cell whose unit SA address is the unit 400 # j is detected from the cell analysis unit 106 # i1, The unit 4 in the selection table 420 # i
The route information corresponding to 00 # j is changed. The Ethernet frame is read from the Ethernet frame buffer 426 # i and output to the Ethernet frame processing unit 78 # i.

The control frame transmission buffer 412 # i is a buffer for holding a control frame for transmission, and the Ethernet frame buffer 414 # i is a buffer for holding an IT frame of an Ethernet frame for transmission. The MUX 416 # i has a control frame transmission buffer 412 # i and an Ethernet frame buffer 414 #.
i packet is multiplexed and dual port RA for transmission
Write to M90 # i0, 90 # i1. DMUX418
#I performs the following processing. (i) Dual port R for reception
Frames are read from the AMs 110 # i0 and 110 # i1. (ii) It is determined from FTYPE whether the frame is a control frame or an Ethernet frame. At the time of a control frame, the control frame reception buffer 424 # 1 is written in the corresponding system area. When the frame is an Ethernet frame, it is output to the route selection unit 422 # i.

The route selection table 420 # i is a table for holding route information about the system selected for each unit 400 # j. The route selection unit 422 # i acquires the route information corresponding to the unit SA address of the frame header from the route selection table 420 # i, selects the frame of the corresponding system, and selects the Ethernet frame buffer 42
Write to 6 # i.

The operation of FIG. 26 will be described below.

(1) Creation of Route Selection Information FIG. 29 is a diagram showing the creation of route selection information, and illustrates the case where the unit 400 # 1 creates route selection information. As shown in (1) of FIG. 29, the unit 400 # 1
Transmits a request packet to the unit 400 # 6 through the 1-system transmission path 62 # 1. When the unit 400 # 6 receives the request packet, the unit 400 # 6 relays (2) as shown in (2).
As shown in 1), the response packet is transmitted to the 0-system transmission path 62 # 0. The unit 400 # 1 receives the response packet shown in (21). At this time, the response packet from the unit 400 # 6 arrives at the unit 400 # 1 earlier than the 0-system transmission path 62 # 0. Therefore, for the frame whose unit SA address is the address of the unit 400 # 6, The route information instructing to select is written in the route selection table 420 # i. Similarly, the request packet transmitted to the transmission path 62 # 1 of the 1-system is (3), (4), (5)
Unit 400 # 4, unit 400 #
3, relayed to the unit 400 # 2, (22), (23), (24) (2
As shown in 5), the response packet is transmitted to the 0-system transmission path 62 # 0. Then, the response packet is relayed and transmitted to the unit 400 # 1.

On the other hand, as shown in (11), the unit 400
The request packet transmitted to the # 0 system transmission path 62 # 0 in # 1 is the unit 400 as shown in (12), (13), (14) and (15).
# 3, 400 # 4, 400 # 5, 400 # 6 are relayed to the 1-system transmission path 62 # 1 as shown in (31), (32), (33), (34), (35). The response packet is transmitted, relayed, and transmitted to the unit 400 # 1. Unit 400 # 2
Writes the route information instructing the units 400 # 2 to 400 # 5 to select the system in which the response packet arrives earlier in the route selection table 420 # i.

(2) Route selection in normal case If the line quality is normal, each unit 400 # i sets each unit 400 set in the route selection table 420 # i.
The frame of the relevant system is selected according to the route information for #j (j ≠ i).

(3) Route selection in the case of abnormality FIG. 30 shows switching of the system when the line quality of the 0-system transmission line 62 # 0 connecting the units 400 # 3 and 400 # 4 deteriorates. It is a figure. The switching in the unit 400 # 5 will be described. When the line quality of the 0-system transmission line 62 # 0 between the unit 400 # 3 and the unit 400 # 4 deteriorates, the unit 400 # 5 connects the unit 400 # 3 and the unit 400 # 4 due to the deterioration of the line quality. The quality of the cell passing through the system transmission path 62 # 0 deteriorates, and the cell becomes an HEC error. Therefore, for example, in the unit 400 # 5, the unit 400 # 2
Or the unit address of the unit 400 # 4 to the unit S
The HEC error occurs in the cell transmitted from the 0-system transmission path 62 # 0 as the A address.

The unit 400 # 5 selects a route selection table 420 # 5 to change the route information to the 1st system when the 0th system is selected for the units 400 # 2 and 400 # 3 having the HEC abnormality. To update. The route information is not changed for the cell in which the HEC error has not occurred and the unit for which the 1-system transmission path 62 # 1 is selected. For example,
Regarding the unit 400 # 4, the 0-system transmission path 62 # 0 is selected, but the units 400 # 4 and 40
Since the line quality of the transmission line 62 # 0 between 0 # 5 is not deteriorated, the HEC error does not occur for the cell having the unit address of the unit 400 # 4 as the unit SA address. Does not switch. As a result, when the line quality deteriorates, the route information is changed only for the unit for which the system related to the quality deterioration is selected, so that the delay due to switching can be minimized.

Sixth Embodiment FIG. 31 is a block diagram of a transmission network accommodating Ethernet according to a sixth embodiment of the present invention. The same reference numerals are given to the substantially same components as those in FIG. Attached. The unit 450 # i of this embodiment is different from the unit 400 # i and the like in the following points. It has a function of learning the relationship between the destination MAC address and the unit address of the unit 450 # l accommodating the terminal 52 # ljk having the MAC address (the correspondence relationship between the MAC address and the unit address), and registers the correspondence relationship. What you do not need. When the unit address corresponding to the destination MAC address of the Ethernet frame has not been learned, the broadcast address is set as the unit DA address to I.
Set in T frame header. When the unit address corresponding to the destination MAC address of the Ethernet frame has been learned, the corresponding unit address is set as the unit DA address in the IT frame header to perform traffic.

FIG. 32 shows the unit 450 # i in FIG.
It is a block diagram of (i = 1-6), and the same code | symbol is attached | subjected to the substantially same component as the component in FIG.
FIG. 33 is a block diagram relating to Ethernet frame transmission in the processor 460 # i in FIG. 32, and the components substantially the same as the components in FIG. 5 are designated by the same reference numerals. The MAC address acquisition unit 470 # i acquires the source MAC address from the Ethernet frame reception unit 120 # i. The control frame creation unit 472 # i uses the unit SA address as its own unit address and unit D
A broadcast packet or the like is set in the A address in the frame header, and a notification packet in which the transmission source MAC address is set in DATA is created.

The control frame writing unit 476 # i writes the control frame in the control frame transmission buffer 412 # i. The control frame reading unit 478 # i reads the control frame from the control frame reception buffer 426 # i. M
The AC address pair unit table creation unit 480 # i
The correspondence between the MAC address and the unit address is acquired from the control frame, and the MAC address + unit address is written in the MAC address-to-unit address table 482 # i in ascending order of the MAC address. The MAC address-to-unit table 482 # i is a memory that stores MAC addresses and unit addresses in ascending order of MAC addresses.

FIG. 34 is a diagram showing a process for acquiring a unit DA address. Unit DA address acquisition unit 484 #
When i receives the Ethernet frame, it performs the following processing as shown in FIG. (i) The destination MAC address is extracted from the Ethernet frame. (ii) Destination MAC
Using the address as a key, the MAC address-to-unit table 482 # i is searched for a match by a two-branch search.

FIG. 35 is a diagram showing a two-branch search. MA
The C address-to-unit table 482 # i contains
As shown in, it is assumed that 16 MAC address-to-unit records are registered. The source MAC address is compared with the MAC address of the ninth MAC address correspondence record. If the comparison result shows that the source MAC address is smaller, the MAC address of the fifth MAC address correspondence record is compared. If the comparison result indicates that the source MAC address is larger, the MAC address of the thirteenth MAC address correspondence record is compared. Similarly, 3
It is a high-speed search for a match by comparing the MAC address of the second, second, first / second, etc. MAC address corresponding records. The comparison searches for a match / no match. Thus, the MAC address can be searched with a small number of times by the two-branch search,
High-speed search can be realized.

The DA, SA, and CNT addition unit 484 # i is
It is different from the DA, SA, and CNT adding unit 130 # i in FIG. 5 that the following processing relating to the unit DA address setting is performed. (i) When the unit DA address acquisition unit 128 # i can acquire the unit DA address, the unit D in the header
The unit DA address acquired in the A address is set in the header. (ii) When the unit DA address cannot be acquired, the broadcast address is set.

The operation of FIG. 31 will be described below.

(1) The unit address learning unit 450 # i uses the transmission source MA in the MAC header of the Ethernet frame transmitted from the terminal 52 # ijk.
The C address is extracted, the own unit address is set as the unit SA address, the broadcast address is set as the unit DA address in the header, and the transmission source MAC is set in DATA.
Send the notification packet with the address set. When the unit 450 # j (j ≠ i) receives the notification packet, the unit 450 # j receives the unit DA address and the source MAC from the notification packet.
The addresses are extracted, sorted and written in the MAC address pair unit table 482 # j in the ascending order of the MAC addresses.

(2) The Ethernet frame transmission unit 450 # i uses the transmission source MA in the MAC header of the Ethernet frame transmitted from the terminal 52 # ijk.
The C address is extracted, the two-branch search is performed to search the MAC address-to-unit table 482 # i, and the unit DA address corresponding to the source MAC address is searched. When the corresponding unit DA address can be retrieved, the unit SA address is set to its own unit address and the unit DA address is set to the unit DA address in the header. When the corresponding unit DA address is not retrieved, the unit SA address is set to the self unit address. The unit address, the unit DA address, the broadcast address, etc. are set in the header, and the IT frame is transmitted.

As described above, by learning the unit address, it is not necessary to register the relationship between the MAC address and the unit DA address in the MAC address-to-unit table, and the PP communication is performed after the learning. It is possible to suppress an increase in traffic.

Seventh Embodiment FIG. 36 is a block diagram of a transmission network accommodating Ethernet according to a seventh embodiment of the present invention. The same reference numerals are given to the substantially same components as those in FIG. Attached. Although the own unit address is set by the management terminal or the like, the same unit address may be set in the transmission network due to a setting error, which causes an operational problem. Therefore, the unit 500 # i of the present embodiment
Notifies other units of the set unit address, and the unit notified of the unit address compares its own unit address with the notified unit address, and if they match, sends alarm information to the management terminal. To do.

FIG. 37 shows the unit 500 # i in FIG.
It is a block diagram of (i = 1-6), and the same code | symbol is attached | subjected to the substantially same component as the component in FIG. 38 is a functional block diagram relating to the unit address check of the processor 510 # i in FIG. The unit address control is performed by the control frame creating unit 520 # i, the control frame writing unit 522 # i, and the control frame reading unit 524.
#I and unit address determination unit 526 # i.
The control frame creation unit 520 # i sets the unit SA address to its own unit address, the unit DA address to the broadcast address, etc. in the frame header, and D
A notification packet in which a unit individual identifier (unit MAC address) is set in ATA is created. The solid identifier is a unit-specific MAC address that is set in advance in a ROM, a register or the like at the time of manufacture, and there is no setting error.

The control frame writing unit 522 # i writes the control frame in the control frame transmission buffer 412 # i. The control frame reading unit 524 # i reads the control frame from the control frame reception buffer 426 # i. When the unit SA address of the control frame is equal to the own unit address and the unit individual identifier of the control frame is different from the own unit individual identifier, the unit address determination unit 526 # i determines to the management terminal that there is a unit address setting error. Output an alarm. The cell analysis units 512 # i0 and 512 # i1 in FIG. 36 determine the reception / relay / discard of the control frame in addition to the determination of the reception / relay / discard of the Ethernet frame.

FIG. 39 is a diagram showing criteria for judging reception / relaying / discarding. FTYPE = '1' in FIG. 39 indicates that the frame is an Ethernet frame, and the judgment criteria (1) to (18) in the case of the Ethernet frame are the judgment criteria in FIG.
It is the same as (1) to (18). FTYPE = '0' indicates that the frame is a control frame. At this time, the reception / relay / discard of the control frame is determined according to the following criteria. (19) If USD = '1', the group SA address is its own group, the unit SA address is its own station, the group DA address is '0', and the unit DA address is '0', it is an invalid address and is discarded. (20)
If USD = '1', the group SA address is its own group, the unit SA address is its own station, the group DA address is another group, and LIFE> 1, it is discarded.
(21) USD = '1', group SA address is own group, unit SA address is own station and group DA
If the address is its own group and the unit DA address is its own station and LIFE> 0, it is determined to receive and not relay.

(22) If USD = '1', group SA address is own group, unit SA address is own station, group DA address is own group, unit DA address = other station and LIFE> 1, Decide not to relay. (23) USD = '1' and group SA address is own group and unit SA
Address is own station and group DA address is own group and unit DA address is ALL '1' and LIFE
If = 1, it means broadcast communication, but LIFE
Since = 1, it is determined to receive and not relay. (24) USD = '1', group SA address is own group, unit SA address is own station, group DA address is own group and unit DA address =
If ALL'1 'and LIFE> 1, then it decides to receive and not relay.

(25) If USD = '1', the group SA address is its own station and the unit SA address is its own station, and the group DA address = ALL'1 'and the unit DA address = own station and LIFE = 1, then group broadcast Although it is communication (own station), since LIFE = '1', it is determined to receive and not relay. (26)
USD = '1', group SA address is own group and unit SA address, group DA address is ALL'1 ', unit DA address is own station and LI
If FE> 1, it decides to receive and not relay. (27) If USD = '1', the group SA address is its own group, the unit SA address is its own station, the group DA address is ALL'1 ', the unit DA address is another station, and LIFE> 1, then group broadcast communication (other Station), so it decides not to receive and not to relay.

(28) USD = '1', group SA address is own group, unit SA address is own station, group DA address is ALL'1 ', unit DA
If the address is ALL'1 'and LIFE = 1, all broadcast communication is performed, but since LIFE = 1, it is determined to receive and not relay. (29) USD
= '1', group SA address is own group, unit SA address is own station, group DA address is ALL'1 ', and unit DA address is ALL'1'
If LIFE = 1, it is determined to receive and not relay. The reason why the group SA address is not discarded as a revolving cell even in its own group and the unit SA address is its own station is because an error is output to the management terminal when the same unit address is set redundantly. Item numbers (30) to (39) in the case of FTYPE = '0' are the same as the item numbers (9) to (18). (41) If USD = '1', the group SA address and the unit SA address are other stations, the group DA address is ALL'1 ', the unit DA address is ALL'1', and LIFE> 1,
Although it is all broadcast communication, since LIFE = 1, it is decided to receive and relay.

The unit address control in the transmission network will be described below.

FIG. 40 is a flow chart of unit address check, FIG. 40 (a) is a control frame transmission flow, and FIG. 40 (b) is a control frame reception flow.
FIG. 41 is a diagram showing a unit address check. The unit address control in the transmission network will be described below with reference to these drawings. Here, the unit 500 # 1 is the unit address A, the unit individual identifier 1 is the unit 500 # 2 is the unit address B,
The unit individual identifier 2 and the unit 500 # 3 are the unit address C, the unit individual identifier 3, and the unit 500.
# 4 is a unit address D, a unit individual identifier 4,
The unit 500 # 5 has a unit address E and a unit individual identifier 5. The unit 500 # 6 is the unit individual identifier 6, and it is assumed that the unit address A is erroneously set where the unit address should be F.
It is assumed that the unit 500 # 6 is started up in step S2. The unit 500 # 6 starts up
This is performed when the operation of the transmission network is started, a unit is added, or a unit is replaced. In step S2, the unit 500 # 6, as shown in the control frame configuration image in FIG. 41, has its own unit address A as the unit SA address (SA) and the broadcast address (ALL'1 ') as the unit DA address (DA). , Own unit individual identifier (MAC) 6, FTYPE = '0', information indicating a unit address notification frame (IN
The control frame in which F) and the like are set is transmitted.

In step S10, the unit 500
# 1,500 # 2,500 # 3,500 # 4,500 #
Reference numeral 5 determines whether the control frame is received / relayed / discarded according to the above determination criteria. Here, the reception and relay of the control frame are determined, and the process proceeds to step S12. Step S
12, the units 500 # 1, 500 # 2, 50
0 # 3, 500 # 4 and 500 # 5 relay the control frame. In step S14, the unit 500 #
1,500 # 2,500 # 3,500 # 4,500 # 5
Is the unit S whose own unit address is in the control frame.
It is determined whether it is equal to the A address. If they are equal,
If not equal to step S14, step S14
Return to 10. Here, since the unit SA address is A, the units 500 # 2, 500 # 3, 500 # 4,5
The unit address of 00 # 5 is different from the unit SA address A because the unit addresses are B, C, D, and E, so step S
Return to 10. However, since the unit 500 # 1 has the unit SA address A and is equal to the unit SA address A, the process proceeds to step S16.

In step S16, the unit 500
# 1 determines whether or not the own unit individual identifier is equal to the unit individual identifier of the control frame. If they are equal,
It returns to step S10. If not equal, step S
Proceed to 18. Here, since it is the unit individual identifier 1 of the unit 500 # 1 and the unit individual identifier 6 of the control frame, the process proceeds to step S18. Step S18
In, the unit 500 # 1 outputs an alarm indicating that the duplicated unit address is set to the control terminal.
The control terminal receiving the notification of the alarm resets the unit address in the unit 500 # 6. As described above, according to the present embodiment, the setting error of the unit address is checked, so that the malfunction due to the setting error can be prevented.

The present invention includes the following supplementary notes.

(Supplementary Note 1) In a transmission unit that accommodates a terminal and transmits to the first transmission line, receives from the second transmission line, and relays to the first transmission line, one or a plurality of units to which the own transmission unit belongs A group address storage unit that stores the group address of the group, a unit address storage unit that stores the own unit address, and a source address field based on the addresses stored in the group address storage unit and the unit address storage unit, A header creation unit that creates a header including a destination address field and an identifier field that identifies whether the value set in the destination address field is a group address or a unit address; and a frame transmitted from the terminal. A frame that is added to the header to create frame data A data creation unit, a data transmission unit that maps the frame data to a synchronization frame and transmits the synchronization data to the first transmission line, and a frame data that receives the synchronization frame from the second transmission line and is mapped to the synchronization frame. From the frame data receiving unit that extracts the frame address and the identifier field of the header of the frame data extracted from the frame data receiving unit to determine whether the destination address field is a group address or a unit address. A transmission unit comprising a header analysis unit that compares a unit address and a destination address with the own unit address or the own group address to determine reception / relay.

(Supplementary Note 2) The transmission unit according to Supplementary Note 1, wherein the header creation unit sets a broadcast address in a destination address field when the own transmission unit belongs to a plurality of groups.

(Supplementary Note 3) The identifier field is eliminated, the destination address field has a fixed bit length, and is composed of a group address field for setting the group address and a unit address field for setting a transmission unit address. Further comprising an address space variable designation storage unit that stores an address field designation bit pattern that designates the lengths of the group address field and the unit address field,
The header creation unit sets a group address and a unit address having field lengths specified in the group address field and the unit address field based on the address field specification bit pattern, and the header analysis unit specifies the address field specification. The group address and unit address set in the group address field and unit address field of the header are extracted based on the bit pattern, and the source address is compared with the own unit address, and the destination address is compared with the own unit address and the own group address. Note 1 characterized by determining reception / relay
The described transmission unit.

(Supplementary Note 4) A filtering information storage unit for storing filtering address information of a transmission source group address and a transmission source unit address not to be received is further provided, and the header analysis unit is set in the transmission source address field. The transmission unit according to appendix 2, wherein when the address matches the filtering address information, the frame data is excluded from being received by the terminal.

(Supplementary Note 5) In a transmission network including a plurality of transmission units, each of which accommodates a terminal and performs transmission to the first transmission path, reception from the second transmission path, and relay to the first transmission path, The transmission unit determines whether or not the traffic of the frame transmitted from the terminal exceeds a preset band allocated to the own transmission unit, and when it exceeds the preset band, stops transmission of the frame to the terminal. A flow control unit for instructing, a cell conversion unit for dividing the frame transmitted from the terminal into fixed length cells, a frame insertion unit for accommodating the cells in a synchronization frame, and the synchronization frame for the first transmission path. A frame transmitting unit for transmitting, a frame receiving unit for receiving a synchronous frame from the second transmission path, and a cell contained in the synchronous frame are analyzed to receive / medium cell reception. A transmission network, comprising: a cell analysis unit that determines connection, and a decellization unit that assembles the cells into frames.

(Supplementary Note 6) When the flow control unit receives the frame from the terminal, it adds the frame length to the cumulative total value, and when the monitoring period elapses, the flow controller monitors the inflow amount corresponding to the set band from the cumulative total value. When the threshold value is subtracted and the result value of the subtraction becomes 0 or less, the cumulative addition value is set to 0, and when the cumulative addition value exceeds the inflow amount monitoring threshold value,
6. The transmission network according to appendix 5, wherein it is determined that the traffic volume exceeds a set band.

(Supplementary Note 7) In a ring-shaped transmission network including a plurality of transmission units and configured by duplication of a 0-system transmission line and a 1-system transmission line, each transmission unit has its own unit address as a source address. , A request frame transmitting unit that transmits a request frame in which a broadcast address is set as a destination address to the 0-system and 1-system transmission paths, and when the request frame is received, the request unit is set as a source address and the request is set as a destination address. When a request packet is received, a response frame transmitting unit that returns a response frame in which the source address set in the frame is set to a transmission path different from the system that received the request frame, and a transmission of the system that received the request packet Request frame relay unit that relays to the road and sends when a response frame is received When the destination address is not the own unit address, the response frame relay unit that relays the response frame to the transmission path of the system that received the response frame and the source transmission unit address of the response frame whose transmission unit address is the own transmission unit A route selection table creating unit for registering route selection information indicating which system of the 0-system transmission line and the 1-system transmission line is to be selected in the route selection table based on A header creation unit that creates a header in which the address of the transmission unit that is the destination is set in the destination address; a frame data creation unit that creates frame data by adding the header to the frame transmitted from the terminal; A data transmission unit for mapping frame data into a synchronization frame and transmitting the same to the 0th system and 1st system transmission paths A frame data receiving unit for receiving a synchronization frame from the 0-system and 1-system transmission lines and extracting frame data mapped in the synchronization frame; and a sender of a header of the frame data extracted by the frame data receiving unit. A route selection unit that obtains route selection information corresponding to a transmission unit address from the route selection table and selects frame data received from the 0-system or 1-system transmission route based on the route selection information; And a transmission network.

(Supplementary Note 8) A route selection information switching unit is provided for changing the route selection information corresponding to the source transmission unit address of the frame data when an error occurs in the frame data. The transmission network according to appendix 7.

(Supplementary Note 9) In a transmission network including a plurality of transmission units to which their own unit addresses are set, each transmission unit collects the source terminal address set in the frame transmitted from the terminal side, and is a terminal address. The control unit transmits a control unit that transmits a control frame in which the collection unit and the source unit address as the source unit address and the source terminal address are transmitted, and when the control frame is received, the source unit address set in the control frame is transmitted. An address table registration unit that registers the relationship of the source terminal address in the terminal address-to-unit address table, a control frame relay unit that relays the control frame when the control frame is received, and a destination of the frame transmitted from the terminal side. From the terminal address to the terminal address Destination address determining unit that determines the corresponding unit address by referring to the address table, and the own unit address in the source address field,
When the corresponding unit address is determined in the destination address field, when the unit address and the corresponding unit address are not determined, a header creating unit that creates a header in which a broadcast address is set, and a message are transmitted from the terminal. A frame data creation unit that creates frame data by adding the frame to the header and a data transmission unit that maps the frame data to a synchronization frame and sends the frame to the first transmission path;
A frame data receiving unit that receives a synchronization frame from a transmission line and extracts frame data mapped to the synchronization frame, a source address set in a header of the frame data extracted from the frame data receiving unit, and the self-address. A transmission network, comprising: a unit address, a destination address, and a header analysis unit for judging reception / relay by comparing the own unit address.

(Supplementary Note 10) The address table registration unit sorts the source terminal addresses and registers them in the terminal address-to-unit address table, and the destination unit determination unit performs a two-branch search for the source terminal addresses and applies Note 9 characterized in that the unit address to be determined is determined
The described transmission network.

(Supplementary Note 11) In a transmission network including a plurality of transmission units, a solid-state identifier storage unit that stores the individual identifier of the self-unit, a unit address setting unit that sets the unit address of the self-unit, and the source address as the source address. A control frame transmitting unit that transmits a control frame in which the unit address of the own unit and the individual identifier are set, and an extracting unit that extracts the source unit address and the source individual identifier set in the control frame when the control frame is received. And when the source unit address is equal to the unit address of the own unit and the source individual identifier is not equal to the own individual identifier,
An alarm output unit that outputs an alarm, and a control frame relay unit that relays the control frame when the control frame is received,
A transmission network comprising:

[0127]

As described above, according to the present invention,
Since the group field communication and the PP communication are switched by the identifier field, the frame data can be efficiently accommodated in the synchronization frame. Further, since the optimum route is selected and switched for each unit, the transmission delay can be suppressed. In addition, communication between groups can be performed with a plurality of groups. Further, since the traffic of the frame is monitored and the flow is controlled in each unit, the band of each unit can be guaranteed. Further, since a unit address setting error is detected, it is possible to prevent the occurrence of a defect in the transmission network.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of a transmission network according to the first embodiment of the present invention.

FIG. 3 shows a group of transmission networks.

FIG. 4 is a unit configuration diagram in FIG.

FIG. 5 is a functional block diagram related to Ethernet frame transmission of a processor unit in FIG.

FIG. 6 is a diagram showing an Ethernet frame and cell data.

7 is a configuration diagram of a group address definition register in FIG.

FIG. 8 is a configuration diagram of a cell analysis unit in FIG.

FIG. 9 is a diagram showing criteria for receiving / relaying / discarding cells.

FIG. 10 is a configuration diagram of a transmission network according to a second embodiment of the present invention.

FIG. 11 is a configuration diagram of an address field.

FIG. 12 is a diagram showing address space variable designation bits.

FIG. 13 is a diagram showing a group address and a unit address of a transmission network.

14 is a unit configuration diagram in FIG.

FIG. 15 is a functional block diagram related to Ethernet frame transmission of the processor unit in FIG.

FIG. 16 is a diagram showing criteria for receiving / relaying / discarding cells.

FIG. 17 is a configuration diagram of a transmission network according to a third embodiment of the present invention.

FIG. 18 is a diagram showing a filtering function.

19 is a unit configuration diagram in FIG. 17. FIG.

FIG. 20 is a transmission network configuration diagram according to a fourth embodiment of the present invention.

FIG. 21 is a diagram showing allocation of a common band.

22 is a unit configuration diagram in FIG. 20. FIG.

FIG. 23 is a configuration diagram of an inflow amount limiting function unit in FIG. 22.

FIG. 24 is a diagram showing an inflow amount limit threshold setting unit in FIG. 23.

FIG. 25 is a diagram showing flow control.

FIG. 26 is a transmission network configuration diagram according to the fifth embodiment of the present invention.

27 is a unit configuration diagram in FIG. 26. FIG.

FIG. 28 is a diagram showing an Ethernet frame and cell data.

FIG. 29 is a diagram showing generation of route selection information.

FIG. 30 is a diagram showing system switching.

FIG. 31 is a transmission network configuration diagram according to a sixth embodiment of the present invention.

FIG. 32 is a unit configuration diagram in FIG. 31.

33 is a functional block diagram related to Ethernet frame transmission of the processor unit in FIG. 32.

FIG. 34 is a diagram showing a unit DA address acquisition process.

FIG. 35 is a diagram showing a bifurcated search for a MACDA address.

FIG. 36 is a transmission network configuration diagram according to the seventh embodiment of the present invention.

37 is a unit configuration diagram in FIG. 36. FIG.

38 is a functional block diagram related to a unit address check of the processor unit in FIG. 37.

FIG. 39 is a diagram showing criteria for receiving / relaying / discarding cells.

FIG. 40 is a flowchart of unit address check.

FIG. 41 is a diagram showing a unit address check.

FIG. 42 is a network configuration diagram accommodating a conventional Ethernet.

FIG. 43 is a conventional STM frame configuration diagram.

FIG. 44 is a configuration diagram of a conventional child unit.

FIG. 45 is a configuration diagram of a conventional parent unit.

[Explanation of symbols]

30 group address storage 32 unit address storage 34 Header creation section 36 Frame data creation section 38 Data transmitter 40 frame data receiver 42 Header analysis unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Osamu Sato             Hokkaido Kita-ku Kita-Shichijo Nishi 4-chome 3-1, 1               Fujitsu East Japan Digital Technology Co., Ltd.             Inside the company (72) Inventor Nobuyuki Gouchi             Hokkaido Kita-ku Kita-Shichijo Nishi 4-chome 3-1, 1               Fujitsu East Japan Digital Technology Co., Ltd.             Inside the company (72) Inventor Takahiro Oba             Hokkaido Kita-ku Kita-Shichijo Nishi 4-chome 3-1, 1               Fujitsu East Japan Digital Technology Co., Ltd.             Inside the company (72) Inventor Junya Mikami             Hokkaido Kita-ku Kita-Shichijo Nishi 4-chome 3-1, 1               Fujitsu East Japan Digital Technology Co., Ltd.             Inside the company (72) Inventor Masaaki Suzuki             Hokkaido Kita-ku Kita-Shichijo Nishi 4-chome 3-1, 1               Fujitsu East Japan Digital Technology Co., Ltd.             Inside the company F term (reference) 5K031 AA02 CA08 CB16 CB21 CC03                       DA12 DB10 EC05                 5K033 AA04 CA11 CB08 CB11 CB15                       DA05 DB18

Claims (5)

[Claims] 1. A transmission unit for accommodating a terminal, which transmits to a first transmission line, receives from a second transmission line, and relays to the first transmission line, in one or a plurality of groups to which the own unit belongs. A group address storage unit that stores a group address, a unit address storage unit that stores a self unit address, and a source address field and a destination address based on the addresses stored in the group address storage unit and the unit address storage unit. A header creation unit that creates a header that includes a field and an identifier field that identifies whether the value set in the destination address field is a group address or a unit address; and the header in the frame transmitted from the terminal. Create frame data by adding to frame data A data transmission unit that maps the frame data to a synchronization frame and transmits the synchronization data to the first transmission line; and a frame that receives the synchronization frame from the second transmission line and extracts the frame data mapped to the synchronization frame. A data receiving unit, and determines whether the destination address field is a group address or a unit address from the identifier field of the header of the frame data extracted from the frame data receiving unit, the source address and the own unit address, A transmission unit, comprising: a header analysis unit that compares a destination address with the own unit address or the own group address to determine reception / relay. 2. A filtering information storage unit for storing filtering address information of a transmission source group address and a transmission source unit address which are not received,
The transmission unit according to claim 1, wherein the header analysis unit excludes the frame data from being received by the terminal when the address set in the source address field matches the filtering address information. . 3. A transmission network including a plurality of transmission units that accommodate terminals and perform transmission to a first transmission line, reception from a second transmission line, and relay to the first transmission line, Determines whether the traffic of the frame transmitted from the terminal exceeds a preset band assigned to the own transmission unit in advance, and when the preset band is exceeded, instructs the terminal to stop the transmission of the frame. A flow control unit, a cell conversion unit that divides the frame transmitted from the terminal into fixed-length cells, a frame insertion unit that accommodates the cells in a synchronization frame, and transmits the synchronization frame to the first transmission path. A frame transmission unit, a frame reception unit that receives a synchronization frame from the second transmission path, and a cell contained in the synchronization frame is analyzed to perform cell reception / relay. A cell analyzer for disconnection, transmission network, characterized by comprising a and the deceleration unit assembling the cells into a frame. 4. A ring-shaped transmission network including a plurality of transmission units, wherein the transmission network comprises a 0-system transmission line and a 1-system transmission line, and each of the transmission units has its own unit address and a transmission address. A request frame transmitting unit that transmits a request frame in which a broadcast address is set as a destination address to the 0-system and 1-system transmission lines, and when the request frame is received, the own unit address is set as the source address and the request frame is set as the destination address. When a request packet is received, a response frame sending unit that returns a response frame in which the set source address is set to a transmission path different from the system that received the request frame is sent to the transmission path of the system that received the request packet. The request frame relay unit that relays, and the destination adder when a response frame is received. When the address is not its own unit address, the response frame relay section that relays the response frame to the transmission path of the system that received the response frame and the source transmission unit address of the response frame whose transmission unit address is the own transmission unit A route selection table creation unit for registering route selection information indicating which system of 0-system transmission line and 1-system transmission line is selected in the route selection table, and a source unit address and a transmission source address. A header creation unit that creates a header in which the address of the transmission unit that is the destination is set in the destination address, a frame data creation unit that creates frame data by adding the header to the frame sent from the terminal, and the frame A data transmission unit for mapping data to a synchronization frame and transmitting the data to the 0th system and 1st system transmission paths; Receiving a synchronization frame from the 0-system and 1-system transmission lines,
A frame data receiving unit that extracts frame data mapped to the synchronization frame, and route selection information corresponding to a source transmission unit address of a header of the frame data extracted from the frame data receiving unit from the route selection table. And a route selecting unit that selects frame data received from the 0-system or 1-system transmission line based on the route selection information. 5. A transmission network including a plurality of transmission units having own unit addresses set, wherein each transmission unit collects a source terminal address set in a frame transmitted from a terminal side. And a control frame transmitting section that transmits a control frame in which the own unit address and the source terminal address are set as the source unit address, and a control frame transmitting section that receives the control frame and the source unit address and the source set in the control frame. An address table registration unit that registers the relationship between terminal addresses in the terminal address-to-unit address table, a control frame relay unit that relays the control frame when a control frame is received, and a destination terminal address of a frame transmitted from the terminal side. From the terminal address to unit add The destination unit determining unit that determines the corresponding unit address by referring to the address table, and the own unit address in the source address field and the corresponding unit address in the destination address field. When a unit address to be determined is not determined, a header creating unit that creates a header with a broadcast address set, a frame data creating unit that creates frame data by adding the header to the frame transmitted from the terminal, and A data transmission unit that maps frame data to a synchronization frame and transmits the synchronization data to the first transmission line, and a frame data reception unit that receives the synchronization frame from the second transmission line and extracts the frame data mapped to the synchronization frame And receiving the frame data A header analysis unit that compares the source address set in the header of the frame data extracted from the self-unit address and the destination address with the self-unit address to determine reception / relay. Characteristic transmission network.