JP3188531B2 - Multiplex communication method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital multiplex communication method and apparatus in which a multiplex hierarchy (layer) such as SDH is standardized.

In digital multiplex communication such as SONET in North America, SDH in Europe, and New Synchronization in Japan, hierarchies, data mapping methods (methods of configuring multiplexed data), and the like are standardized at an international level.

In such a transmission system, a data transfer rate of 1.5M (1.544Mb / s), 2M
(2.048 Mb / s) or the like (tributary side) to high-speed 155 M (139.26 Mb / s) or the like (trunk line system) must be processed for each hierarchy. Therefore, transmission or reception of multiplex communication data (D
In each station that performs (rop / Add), it is necessary to prepare and set a device that conforms to the contents of the data to be processed according to the contents of the data to be processed (such as the data unit transfer speed).

The present invention provides a multiplex communication method and apparatus that can automatically determine the content of a transmitted signal and automatically switch to a required device according to the determined data content.

[0005]

2. Description of the Related Art FIG. 9 shows a hierarchical structure (digital hierarchy) of multiplexing such as SDH. In FIG. 9, C-1,
C-2, C-3 and C-4 are basic data units for multiplexing. C-1 is C-11 (1.5M), C-12 (2M)
There are two types. C-2 is C-21 (6M (6.312M
b / s)), C-22 (8M (8.448 Mb / s))
There are two types. C-3 is C-31 (34M (34.36)
8Mb / s)), C-32 (45M (44.736Mb)
/ S)). C-4 is 155M.

In the configuration shown in FIG. 9, when transferring C-2, VC-2 is constructed by adding path overhead (VC-2 POH), which is data operation and maintenance information, to C-2. A plurality of VC-2s are multiplexed, and a pointer (TU-2 PTR) indicating where the multiplexed data portion (payload) is located is further added to configure the TUG-2. Further, a plurality of data units TUG-2 are multiplexed, and a path overhead (VC-4 POH) is added to
Construct C-4. Then, the T multiplexed into VC-4
Pointer (AU-4) indicating the position of the data unit of UG-2
(PTR) to configure AU-4. AU-
4 are multiplexed to form an AUG. Then, an STM-N is configured by adding a section overhead (SOH) as maintenance operation information and a pointer (PTR) indicating the position of the multiplexed data unit (AU-4) (STM-N).
In N, N represents the number of AUGs to be multiplexed, ie
If the STN is composed of only one AUG, STM
-1).

FIG. 10 shows a mapping method for multiplexing C-1 in a multiplexed hierarchical structure such as SDH shown in FIG. At the C-1 level, 200 represents a C-1 data unit.

At the level of VC-1, 201 (VC
-1 POH) represents a path overhead added to C-1. Reference numeral 202 denotes a path overhead (VC-1) for C-1.
POH) is a data unit VC-1.

At the level of TU-1, 203 is VC
-1 (202) pointer (TU-1 PT
R). TU-1 is configured by adding (TU-1 PTR) to VC-1.

At the level of TUG-2, 202 ',
202 "each represents VC-1. 203 '(TU-
1 PTR) and 203 ″ (TU-1 PTR) are respectively VC-1 (20) in the data unit (TUG-2).
2 '), VC-1 (202 "). Pointers 203', 203", VC-1 (20
2 ′) and VC-1 (202 ″) constitute TUG-2.

At the level of TUG-3, a plurality of TUs
G-2 (204, 204 ') is multiplexed and TUG-3
And At the VC-4 level, multiple TUG-3s
(205, 205 ′) with path overhead (VC-4).
VC-4 is created by adding POH (206).

At the level of AU-4 and AUG, VC
A pointer (AU-4 PTR (208)) indicating the position of each TUG-3 included in the AUG (2
11) is constituted.

At the STM-N level, a plurality of AUs
G (210, 211) has section overhead (21
STM-N is configured by adding 2).

FIG. 11 shows a mapping method from C-32 to VC-4. In FIG. 11, 200 ′ is C-32.
This is the portion that becomes the payload of the VC-32 (201 ′). Reference numeral 201 'denotes a VC-32, which is a data unit of 85 columns and 9 rows. 213 (VC-32 PO
H) is a path overhead. 203 is an undefined area of the path overhead.

204 "(TU-32) is a data unit of 86 rows and 9 rows, and is obtained by adding a pointer (TU-32 PTR) to the VC-32 (201 ').
There are three TU-32s, which are indicated by (1), (2) and (3), respectively. 205 "(TU-32PTR) is a pointer,
TU- is determined by the data of H1, H2, H3 (1 byte each).
32 (204 ″) is multiplexed to form a VC-4
It indicates the start position of TU-32 (1), (2), and (3) in C-4.

Reference numeral 206 denotes a VC-4 having 261 columns and 9 rows. VC-4 (206) is TU-
32 (204 "). H1, H2, and H3 in (1) are pointers to TU-32 (1).
H1, H2 and H3 in (2) are pointers of TU-32 (2). H1, H2, and H3 in (3) are pointers to TU-32 (3). 207 (VC-4 POH) is VC-4
This is the path overhead of (206). In FIG. 11, a dotted area 208 'is an area of a fixed value.
This is an invalid data area filled with 1.

As shown in FIG. 11, C-32 to VC-
4 is mapped to a pointer to VC-32 and TU
-32 is multiplexed with three path overhead VC-4 PO
H (207) is added to configure 261 rows of VC-4.

Further, the pointer AU-4P is assigned to the VC-4.
AU-4 is constructed by adding TR. FIG. 12 shows the VC-4
FIG. 3 is a diagram showing a mapping method from STM-1 to STM-1.

In FIG. 12, reference numeral 220 denotes VC-4, 22
1 is a path overhead (VC-4POH),
This is the path overhead of C-4. 222 is STM-1
(9 rows x 270 columns), VC-4 (220)
One section overhead (RSOH and MSOH)
And a pointer AU-4 PTR (223).

223 (AU-4 PTR) is a 9-byte pointer, and A, B, and C are each VC-3 (1).
, The start position (address) of the VC-3 (2) area, and the start position (address) of the VC-3 (3) area (VC-3 is , For example, VC-32). 224 is the area of VC-3 (1), 225
Is a VC-3 (2) area, and 226 is a VC-3 (3) area. The pointer (AU-4 PTR) 223 is located on the fourth line in the section overhead area.

FIG. 13 is an explanatory diagram of the section overhead and pointer of STM-1. FIG. 13A shows the section overhead and the pointer. It consists of 9 rows x 9 columns, and each column is 1 byte in size. RSOH, MSO
H is a section overhead, and AU-4 PTR is a pointer.

In FIG. 13, areas marked with a circle are areas that can be defined in each country. A1, A2, A3, etc. are areas in which usage methods are defined (however, some areas are not used depending on the country or the manufacturer).
The area marked with “-” is an undefined area.

(B) shows a pointer. 240 (AU-4
(PTR) is a 9-byte pointer, and (1) H1, H
2, H3 are pointers of VC-3 (1), and (2) H1,
H2 and H3 are pointers of VC-3 (2), and (3) H
1, H2 and H3 are pointers of VC-3 (3).

Reference numeral 241 indicates a pointer of the VC-3 (1).
The upper 4 bits of H1 are a new data flag (NDF) for controlling the change of the pointer value. The upper 5th and 6th bits of H1 are SS bits, which give the size of the data area (the size of 1 area of VC-4). Hereinafter, a pointer value (information of the head position of 1 of VC-4) is given by 10 bits, and 8 bits of H3 are used for other information.

[0025]

In the conventional multiplex communication such as SDH, the content (transfer speed, which lower layer data unit is multiplexed) of the signal (data) transmitted in each layer is described. For example, the only way to determine (e.g.) is to estimate the content of the data based on the SS bit. However, the SS bit indicates the size of the data, and its content cannot be specifically determined. For example, in FIG. 9, at the AU-4 level, the data is AU-level by the SS bit of the AU-4 PTR.
-4, but the content of the data is C-4
Whether there is one (140M) basic data unit,
It was not possible to judge the contents of the data up to the lower level, such as whether the data unit of TUG-3 is multiplexed for 3CH.

For this reason, conventionally, when changing the transfer speed, configuration, and the like of data to be transmitted, an operator who is familiar with the configuration of the system has to deal with it by replacing the entire device, such as replacing units. However, it was not possible to automatically determine the type of data based on the received data and automatically change the device configuration. In addition, it is impossible for the maintenance worker to monitor the contents of the transmission signal unless the user knows the data configuration of the system in detail.

An object of the present invention is to provide a multiplex communication method and apparatus which can automatically determine the contents of data in a lower layer of multiplexed data in an upper layer in an upper layer.

[0028]

According to the present invention, the overhead of each layer is provided with lower layer identification information which can determine the contents of the data of the lower layer by utilizing the undefined area of the overhead assigned to each layer. The contents of the data in the lower hierarchy can be easily determined by the overhead of the upper hierarchy.

FIG. 1 shows the basic configuration (1) of the present invention. FIG.
Shows the multiplex communication method of the present invention and the basic configuration of the transmitting apparatus. In FIG. 1, reference numeral 1 denotes a multiplex communication device (transmission side device). A multiplexing unit 2 multiplexes data units. 3 is a basic data unit, 1.5M,
It is a basic data unit of multiplexing such as 2M, 6M, 155M and the like.

Reference numeral 4 denotes an overhead creating unit for creating an overhead, which is maintenance and operation information of multiplexed data, for each multiplexing hierarchy. Each overhead includes lower layer identification information that can identify the contents of data in the lower layer (transfer speed, which lower layer data unit is multiplexed, etc.), and the overhead generator 4 performs overhead processing. When creating a file, lower-layer identification information is created based on the lower-layer identification information included in the overhead created in the lower layer so that the contents of the data can be identified, and the lower-layer identification information is provided in the overhead. . Reference numeral 5 denotes a lower layer identification information creating unit.

Reference numeral 6 denotes a data unit (X), which is obtained by multiplexing the basic data units B or C. The data unit (X) 6 is composed of an overhead (OH) and a payload of multiplexed data (FIG. 1 shows the case of B). 7 is a data unit (Y), which is a basic data unit A
Alternatively, the data unit X (6) is multiplexed.
The multiplexed data Y is composed of an overhead (OH) and a multiplexed data unit X portion (X1, X2 in FIG. 1).

Reference numeral 10 denotes an undefined area of the data unit (Y) overhead. The undefined area 10 indicates whether the data unit (Y) 7 is a multiplex of the basic data unit A or a multiplex of the data unit (X) 6, and the data unit (X) 6 Is multiplexed, lower layer identification information for identifying which of the basic data units B and C is multiplexed is set. 11 is the data unit (X)
Is an undefined area with overhead. In the undefined area 11, lower layer identification information for identifying which of the basic data units B and C is multiplexed is set.

An output unit 12 outputs the multiplex communication data created by the multiplexing unit 2. The operation of the configuration of FIG. 1 will be described later.

FIG. 2 shows the basic configuration (2) of the present invention. FIG.
Indicates the basic configuration of the receiving device of the multiplex communication device. In FIG. 2, reference numeral 20 denotes a receiving side device of the multiplex communication device. 21
Is a receiving unit for receiving the multiplex communication data 30. Reference numeral 22 denotes a separation device that separates multiplexed communication data into multiplexed data of lower layers in a stepwise manner. Reference numeral 23 denotes a separating unit 1 for separating the multiplexed data of the highest hierarchy. A switching unit 24 switches the multiplexed data separated by the separation unit 1 (23) to be output to the basic data unit A or the separation unit 2 (25). Reference numeral 25 denotes a demultiplexer 2, which demultiplexes the multiplexed data separated by the demultiplexer 1 into multiplexed data of the next layer. 26 is a switching unit,
The multiplexed data separated by the separation unit 2 (25) is switched to the basic data unit B or the basic data unit C side.

Reference numeral 27 denotes a lower layer determining unit which determines the type of multiplexed data of the lower layer based on the lower layer identification information of the upper layer, and switches the switching unit 1 (24) and the switching unit 2 (2).
The switching control of 6) is performed.

Reference numeral 30 denotes multiplex communication data, and 31 denotes lower layer identification information in the overhead of the multiplex communication data.
The operation of the basic configuration (2) in FIG. 2 will be described later.

In the above basic configurations (1) and (2), multiplexing is performed in two layers. This is an example, and the present invention is divided into a plurality of layers such as the SDA described in the prior art. This is applied to a multiplex communication method.

[0038]

The operation of the basic configuration shown in FIG. 1 will be described. As an example,
A case where the basic data unit B is multiplexed and output will be described.

The multiplexing unit 2 multiplexes the basic data unit B. At this time, the lower layer identification information creating section 5 of the overhead creating section 4 creates lower layer identification information for identifying that the data unit to be multiplexed is B, and the overhead creating section 4 places the lower layer identification information in the undefined area 11 of the overhead. Create an overhead in which the layer identification information is set. Then, an overhead including the created lower layer identification information is added to the multiplexed data (payload) of the basic data unit B,
A data unit (X) 6 is created.

Next, the multiplexing unit 2 multiplexes the data unit (X) to create multiplexed data (X1, X2). Then, the lower layer identification information creating unit 5 determines that the multiplexed data is a data unit (X), and that the data unit (X) is a multiplexed version of the basic data B, and identifies that. Create lower-level identification information that can be created. Then, the overhead creating unit 4 creates an overhead in which the lower layer identification information is set in the undefined area. And
The data unit (Y) 7 is created by adding an overhead including lower layer identification information to the multiplexed data (X1, X2).

The output unit 12 outputs the multiplex communication data created by the multiplex unit 2 to a line. Basic configuration of Fig. 2
The operation of (2) will be described.

The receiving section 21 receives the multiplex communication data 30. The received data is X1, which is a multiplex of the basic data unit B,
X2. In the demultiplexer 22, the demultiplexer 1 (23) demultiplexes the multiplexed communication data 30 into multiplexed data of the next layer, and transfers the multiplexed data 30 to the switching unit 1. The lower layer determining unit 27 determines that the data of the next layer is a data unit X (X1, X2) based on the lower layer identification information 31 set in the overhead of the multiplex communication data 30, and X further multiplexes the basic data unit B. It is determined that it has been converted. The switching control of the switching unit 1 (24) is performed based on the determination result, so that the data separated by the separation unit 1 (23) is transferred to the separation unit 2 (25). Further, since the data unit X is composed of the basic data unit B, the lower layer determination unit 27 controls the switching of the switching unit 2 (26), and the multiplexed data separated by the separation unit 2 (25) is Switching control is performed so that the basic data unit B is output to the side to be output.

As described above, the multiplexed data separated by the demultiplexing unit 1 (23) is transmitted to the demultiplexing unit 2 via the switching unit 1 (24).
Transferred to (25). Further, the separated data unit is separated by the separation unit 2 (25) and output to the basic data unit B side via the switching unit 2 (26).

[0044]

FIG. 3 shows a system according to an embodiment of the present invention. FIG.
Shows a case where the present invention is applied to a multiplex communication system such as SDH.

In FIG. 3, 49 is a multiplexing section, 50 is an overhead creating section, 51 is a lower layer identification information creating section, 52
Represents the type determination processing of the lower hierarchy. C-1, C-2, C
-3 and C-4 are basic data units. The hierarchical structure of FIG. 3 is the same as that of FIG.

The operation of the configuration shown in FIG. 3 will be described. A case where the basic data unit C-1 is multiplexed will be described. When multiplexing C1, the lower layer identification information creating section 51 determines that the multiplexed data is C-1 (C-11 or C-12), and creates lower layer identification information. Further, the overhead creating unit 50 includes an overhead (VC-1) including lower layer identification information and the number of multiplexed basic data units.
POH).

The multiplexing unit 49 multiplexes C-1 and adds the overhead (VC-1 POH) to create VC-1. Further, a pointer (TU-1 PT
R) to create TU-1. TUG-2 is created by multiplexing a plurality of TU-1s.

Next, the multiplexing unit 49 multiplexes a plurality of TUG-2s to create TUG-3. Based on the lower layer identification information added to the overhead of TUG-2, the lower layer identification information creating unit 51 determines that the type of data to be multiplexed in TUG-3 is C-1 (C-11 or C-12). It determines that there is, and creates lower layer identification information. The overhead creating unit 50 creates an overhead (VC-4 POH) including the lower layer identification information created by the lower layer identification information creating unit 51 and the number of multiplexed data. The multiplexing unit 49 multiplexes TUG-3 for 3 channels and adds overhead (VC-4POH) to create VC-4. Further, the pointer (AU-4 PTR) is changed to VC-4.
To create AU-4.

Next, the lower layer identification information creating section 51 sends the AU
Based on the overhead of G, it is determined that the type of AUG data is TUG-3, and lower layer identification information is created. The overhead creating unit 50 creates an overhead (SOH) including the number of multiplexed data units and lower layer identification information indicating that the type of multiplexed data is TUG-3. The multiplexing unit 49 multiplexes the AUG and adds an SOH and a pointer (PTR) to the multiplexed data of the AUG to create an STM-N (N is the number of multiplexed data of the AUG).

FIG. 4 shows an example of lower layer identification information according to the present invention. In FIG. 4, reference numeral 60 denotes the overhead of VC-1 (V
C-1 POH), 61 is identification information of C-11 and C-12, and the type of data of VC-1 is C-11 or C-
This is information for identifying whether the number is 12. C-11, C-1
2 is the VC-1 overhead (VC-1 P
Any area can be used as long as it is an undefined area of (OH).

Reference numeral 62 denotes the overhead of VC-4 (VC-4
POH), 63 are identification information of C-4 and TUG-3, and whether the data type of VC-4 is C-4
-3. Further, if the content (type) of the data is TUG-3, the content is C-
3 or TUG-2. If the identification information of C-4 and TUG-3 is an undefined area of VC-4 overhead (VC-4 POH),
You can use anywhere.

Reference numeral 64 denotes an STM-N overhead (SO
H) and 65 are identification information of AU-4 and AU-3,
This is information for identifying whether the type of STM-N data is AU-4 or AU-3. The identification information of AU-4 and AU-3 may be used in any undefined area of the overhead (SOH) of STM-N.

FIG. 5 shows a network embodiment of the present invention. In FIG. 5, reference numeral 70 denotes station A, and 34M (C-
31) The multiplex communication data is extracted from the trunk line 75 or 78, and the 34M (C-31) data is multiplexed to 15
5M multiplex communication data is created and trunk line 75 or 78
Is output to

Reference numeral 71 denotes a station B which extracts 2M (C-12) multiplex communication data from the trunk line 75 or 76,
2M (C-12) data is multiplexed to create 155M multiplex communication data and output to the trunk line 75 or 76.

Reference numeral 72 denotes a station C which extracts multiplex communication data of 2M (C-12) and 34M (C-31) from the trunk line 76 or 77, and outputs 2M (C-12) or 3M (C-12).
It multiplexes 4M (C-31) data to create 155M multiplexed communication data and outputs it to the trunk 76 or 77.

Reference numeral 73 denotes a station D which extracts 2M (C-12) multiplex communication data from the trunk line 77 or 78,
2M (C-12) data is multiplexed to create 155M multiplex communication data, which is output to the trunk line 77 or 78.

FIG. 6 shows an example of the configuration of a station apparatus according to the present invention. In FIG. 6, reference numeral 80 denotes a station device, which is a device in the stations A, B, C, and D in FIG. Reference numeral 81 denotes a lower layer identification information detecting unit which receives multiplex communication data (for example, STM-1 (155M)) and checks whether the data multiplexed based on the lower layer identification information is TUG-3. -4. Reference numeral 82 denotes a device switching unit that transfers a signal (multiplex communication data) according to the type of data (TUG-3 or C-4) multiplexed in STM-1 (TUG-3 processing device or TUG-3 processing device). (C-4 processing device).

In FIG. 6, reference numeral 84 denotes a TUG-3 processing unit which processes TUG-3 hierarchical data. The TUG-3 processing device 84 has three devices including a device for processing data of C-12 (C-12 in FIG. 6) and a device for processing data of C-32 (C-32 in FIG. 6).
# 1 is the device of the machine number 1 thereof, # 2 is the device of the machine number 2 thereof, and # 3 is the device of the machine number 3 thereof. 85
Is a C-4 processing device which processes C-4 multiplex communication data.

FIG. 7 shows an embodiment (1) of the station apparatus according to the present invention. 7, reference numeral 81 denotes a lower layer identification information detecting unit;
2 is a device switching unit, 84 is a C-4 processing device, 85 is a TU
This is a G-3 processing device (the above is common to FIG. 6).

Reference numeral 90 denotes a separation unit 1 (DMUX),
AUX multiplexed data of TM-1 (multiplex communication data) is separated into data units. Reference numeral 91 denotes a switching control unit (VC-4 POH MON) which identifies lower layer identification information included in the section overhead of the STM-1, and switches the device switching unit (SW) 82 and the switching unit 3-1.
(101), switching unit 3-2 (104), switching unit 3-
3 (107).

Reference numeral 95 denotes a C-4INF, which is an interface for 155M multiplexed data. A demultiplexer 100 (DMUX) demultiplexes the multiplexed data of TUG-3 into data units. 101 is a switching unit 3
-1 and the multiplexed data separated by the separation unit 2 (100) is converted to C-3INF (102) or C-1INF
It is switched to transfer to (103). 1
02 is a C-3INF, which is an interface for multiplexed data of C-3. 103 is a C-1INF, an interface of the multiplexed data of C-1. T
UG-3 (# 1) is a switching unit 3-1 (101), C-3
INF (102) and C-1 INF (103).

Reference numeral 104 denotes a switching unit 3-2 which converts the multiplexed data separated by the separation unit 2 (100) into C-3INF.
(105) or C-1INF (106). Reference numeral 105 denotes a C-3INF, which is an interface for C-3 multiplexed data. Reference numeral 106 denotes a C-1 INF, which is an interface for multiplexed data of C-1. TUG-3 (# 2) is a switching unit 3-2 (104), C-3INF (105), C-3
-1INF (106).

Reference numeral 107 denotes a switching unit 3-3 which converts the multiplexed data separated by the separation unit 2 (100) into C-3INF.
(108) or C-1INF (109). Reference numeral 108 denotes a C-3 INF, which is an interface for C-3 multiplexed data. Reference numeral 109 denotes a C-1 INF, which is an interface for C-1 multiplexed data. TUG-3 (# 3) is a switching unit 3-3 (107), C-3INF (108),
-1INF (109).

The operation of the configuration shown in FIG. 7 will be described. Separation unit 1
(90) separates multiplexed data of AU-4 or AU-3 of STM-1 into data units. Hereafter, STM-1
Is a multiplexed version of AU-4.

When AU-4 is multiplexed data of C-4 (155M), switching control section 91 controls apparatus switching section 82 based on lower layer identification information included in overhead (VC-4POH). I do. As a result, the device switching unit 82 converts the multiplexed data of C-4 separated by the separation unit 1 (90) into C-4 IN which is an interface of C-4.
The switch is switched to the side of F (95). And 1c
The 155M (C-4) multiplexed data of h is processed by the C-4 processor 84.

When the AU-4 is obtained by multiplexing TUG-3 on three channels, the switching control unit 91 determines whether the multiplexed data is TUG-3 based on the lower layer identification information included in the overhead (VC-4POH). It is further determined whether the content is C-32 or C-12 in the lower hierarchy. According to the determination result, the switching control unit 91 switches the device switching unit 82 to the side of the TUG-3 processing device 85, and at the same time, the multiplexed data included in the TUG-3 is
Switching unit 3-1 according to whether the number is 32 or C-12
(101), switching unit 3-2 (104), switching unit 3-
3 (107) is switched to the side of each processing device.

For example, when the TUG-3 is obtained by multiplexing C-32, the multiplexed data of TUG-3 for three channels separated by the separation unit 1 (90) is transmitted to the device switching unit 8.
2 and is transferred to the separation unit 2 (100). In the demultiplexing unit 2 (100), the multiplexed data of C-32 is
h through the switching unit 3-1 (101), the switching unit 3-2 (104), and the switching unit 3-3 (107), respectively, the C-3INF (102) and the C-3INF (10).
5), transferred to C-3INF (108). And
Each processor processes C-32 data one channel at a time.

When the TUG-3 is obtained by multiplexing C-12, the TUG-3 demultiplexed by the demultiplexer 1 (90)
The multiplexed data of the channel TUG-3 is transferred to the demultiplexing unit 2 (100) via the device switching unit 82. Separation unit 2
In (100), multiplexed data of C-12 is 3ch
And C-1 INF (103) and C-1 INF (10) via the switching unit 3-1 (101), the switching unit 3-2 (104), and the switching unit 3-3 (107).
6), transferred to C-1 INF (109). And
In each processing unit, C-1 of 21 ch
The two multiplexed data are separated into one channel.

FIG. 8 shows an embodiment (2) of the station apparatus according to the present invention. The embodiment (1) of the station apparatus shown in FIG.
5M) for all channels (155M1ch, 34M × 3ch, 2M × 63c)
h). However, one station transmits and receives all channels (Dro
p / Add) is rare, except in special cases.
Therefore, the number of channels to be prepared is 255M1ch, 34M2c.
h, 2M 42ch, 34M channel device, 2M
No distinction is made between device numbers # 1 and # 2 for
It is possible to reduce the device scale by selecting a vacant channel.

FIG. 8 shows an embodiment in such a case. 8, reference numeral 81 denotes a lower layer identification information detecting unit;
2 is a device switching unit, 84 is a C-4 processing device, 85 is a TU
G-3 processing apparatus. 90 is a separation unit 1 (DMUX),
91 is a switching control unit (VC-4 POH MON), 9
5 is C-4INF, 100 is a separation unit 2 (DMUX), 1
01 is the switching unit 3-1, 102 is the C-3INF, 103
Is a C-1INF, 104 is a switching unit 3-2, 105 is a C-3INF, and 106 is a C-1INF.

The above reference numerals are the same as those of the station apparatus according to the embodiment (1) of the present invention shown in FIG. Reference numeral 110 denotes a vacant channel selection unit which converts the multiplexed data demultiplexed into three channels transferred from the demultiplexing unit 2 (100) into a vacant switching unit 3-1 (101) for selecting a vacant channel. It is distributed to the section 3-2 (104).

The operation of the station configuration according to the embodiment (2) of the present invention shown in FIG. 8 is the same as that of the station configuration according to the embodiment (1) of the present invention shown in FIG.

[0073]

According to the present invention, with respect to the layered multiplexed communication data, the type of data (transfer speed, number of multiplexing, etc., etc.) of the lower layer multiplexed data due to the overhead of the upper layer in the transmission / reception apparatus of each station. ) Can be known, so that the equipment of each station can automatically process the equipment configuration necessary for separating the received data. Therefore, maintenance and operation of the device in each station becomes easy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration (1) of the present invention.

FIG. 2 is a diagram showing a basic configuration (2) of the present invention.

FIG. 3 is a diagram showing a system configuration according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of lower layer identification information of the present invention.

FIG. 5 is a diagram showing a network embodiment of the present invention.

FIG. 6 is a diagram illustrating a configuration example of a station device according to the present invention.

FIG. 7 is a diagram showing an embodiment (1) of a station device of the present invention.

FIG. 8 is a diagram showing an embodiment (2) of the station device of the present invention.

FIG. 9 is a diagram illustrating a hierarchical structure of multiplexing such as SDH.

FIG. 10 is a diagram showing a mapping method when multiplexing C-1.

FIG. 11 is a diagram illustrating a mapping method from C-32 to VC-4.

FIG. 12 is a diagram showing a mapping method from VC-4 to STM-1.

FIG. 13 is an explanatory diagram of a section overhead and a pointer of STM-1.

[Explanation of symbols]

 1: multiplex communication device (transmission side device) 2: multiplexing unit 3: basic data unit 4: overhead creating unit 5: lower layer identification information creating unit 6: data unit (X) 7: data unit (Y) 10: not yet Defined area (lower layer identification information) 11: Undefined area (lower layer identification information) 12: output unit

Continuation of the front page (56) References JP-A-6-97955 (JP, A) CCITT Blue Book, Volume 3, Volumes 3-4, 5 G Series Recommendations, Foundation Japan ITU Association, November 1991 1st (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00-3/26

Claims (3)

(57) [Claims] In a multiplex communication method for performing communication by hierarchizing and multiplexing data units, a transmitting device (1) includes a multiplexing unit (2) for multiplexing data units of a lower hierarchy. The unit (2) has an overhead creation unit (4) that creates an overhead that includes lower layer identification information representing the contents of the lower layer data unit. By adding the lower layer identification information to the overhead for each multiplexing layer, A multiplex communication method characterized in that the contents of a lower layer data unit can be determined by overhead of an upper layer. 2. A multiplex communication apparatus for multiplexing and communicating data by layering and multiplexing data units, comprising: a multiplexing unit for multiplexing data units.
(2), and the multiplexing unit (2) is an overhead creation unit that creates the overhead including the maintenance and operation information of the multiplexed data.
The overhead creating section (4) includes a lower layer identification information creating section (5) for creating lower layer identification information representing the contents of the multiplexed lower layer data unit, and the overhead creating section (4). )
A multiplex communication apparatus for creating an overhead including lower layer identification information. 3. A multiplex communication apparatus for multiplexing and communicating data in a hierarchical manner, wherein a receiving side device (20) includes lower layer identification information (31) indicating the contents of lower layer data in the overhead of each layer. And a demultiplexer (22) for demultiplexing the received multiplexed communication data. The demultiplexer (22) separates the separated multiplexed communication data into respective contents. A switching unit (24, 26) for switching to a lower-level device that processes the data unit, and a switching unit (24, 26) for determining lower-layer identification information of the overhead of the multiplex communication data.
26. A multiplex communication apparatus comprising: a lower layer determining unit (27) for controlling (26).