JP2000092525A - Cross connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cross connection system simplifying band changing in a non-band shared area of a framed signal allocated inherent in each storing terminal and a band shared area allocated as a shared area of respective storing terminals. SOLUTION: Relating to a framed signal between an LT 281 for storing plural NTs 2311 to 231L by multipoint connection and an XC 30 to be a spatiotemporal switch, a shared area allowed to be shared by respective NTs is secured following a data area. At the time of sending the shared band to a packet data network 25 the shared band is secured in the front of the data area and sent to the network 25. Although the band allocation of communication data required to be stored on the front side in the network in a conventinal method, a shared area and a non-shared area are temporarily divided into the front side and the rear side at the time of executing cross connection and then their band allocation is independently executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-connect system, and more particularly to a cross-connect system for allocating a band shared by a plurality of network terminators and a non-shared band unique to each network terminator.

[0002]

2. Description of the Related Art Conventionally, a cross-connect system exchanges communication data stored in a pre-allocated band of a frame-structured signal with a destination to be transmitted. Such a cross-connect system accommodates a subscriber telephone terminal and a data communication terminal, and a subscriber telephone network or a data communication network may be connected as its destination.
When making communication data into a frame structure, a terminal-specific band allocated in advance to each terminal is allocated. Then, the bandwidth is saved by separately allocating a terminal shared bandwidth that can be shared by these terminals. This is because, for an amount of data that cannot be communicated in a terminal-specific band, the terminal-shared band is used only when necessary.

FIG. 11 shows an outline of the configuration of such a conventional cross-connect system. In this cross-connect system, a plurality of line terminal devices (Line Terminals: hereinafter, abbreviated as LT) 10 ₁ accommodating a plurality of subscriber telephone terminals and data communication terminals (not shown), respectively.
To 10 _N , a plurality of interfaces (hereinafter, abbreviated as IF) 11 _{1 to} 11 _M connected to a subscriber telephone network or a packet data network (not shown) and interfacing with these networks, and each of these LTs 10. _A cross-connect device (CrossConnect: hereinafter abbreviated as XC) 12 for exchanging data between ₁ to 10 _N and the IFs 111 to 11 _M is provided.

[0004] LT10₁-10_NIs that as mentioned above
Accommodates multiple subscriber telephone terminals and data communication terminals respectively
Communication data for each of these terminals is allocated in advance.
The transmission and reception of framed signals stored in the allocated band
Do with the terminal. Also, IF11 ₁~ 11_MIs as described above
Subscriber network or packet connected to the other end
Data network signal interface
I have. When the subscriber telephone network is connected to the IF,
Can communicate with other subscriber telephone terminals via
When a packet data network is connected,
It can communicate with data communication terminals. Join
Communication data of mobile phone terminals and data communication terminals
Only stored in pre-allocated bandwidth when
Therefore, the signal format in each communication network is
It is possible to make effective use of the bandwidth without depending on
Wear.

[0005] The XC 12 is constituted by a time-space switch, and can switch a frame and a slot previously allocated to each band to a transmission path to a corresponding LT or IF. For this purpose, usually XC
Reference numeral 12 has a path table as a correspondence table indicating which slot or communication data of the slot of the framing signal is transmitted to which LT or IF.

By the way, in order to make a signal having a limited data length into one frame, each of the LTs 101 to _{1 is set} so that the band fixedly allocated to the framed signal is reduced as much as possible.
_Bands that can be shared by 0 _N are separately allocated. The shared bands allocated in this way are LT10 ₁ to LT 10 _N
Is set as a band in which only communication data from any one of the LTs can be used.

FIG. 12 shows an outline of the frame structure of the above-mentioned framed signal. The framing signal 13 is allocated to a predetermined framing signal band 14 with an overhead (OverHead: OH) area 15 in which communication control information of the framing signal is described and a data area 16 in which communication data is stored. Have been. The data area 16 includes a non-bandwidth shared area 17 uniquely assigned to each terminal and a bandwidth shared bandwidth 18 shared by each terminal.
And an unused area 19 as an area to which a band can be further allocated. In the non-band shared area 17 in FIG. 12, for example, the first to third NT-specific band areas 1 uniquely assigned in advance to the first to third NTs, respectively.
Shows that bandwidth is partitioned by 7 _{1-17 3.}

[0008] In the framing signal having such a configuration, each terminal stores communication data of its own terminal in a band or a shared band uniquely allocated to each terminal, and transmits an XC signal via the LT.
12 is sent. The XC 12 refers to a preset path table and divides data of a predetermined slot of the framing signal into a corresponding IF and transmits the divided IF. For example, the data of the first NT-specific band region 17 ₁ of the slot IF 11 _1, the data of the second NT-specific band region 17 ₂ slots IF 11 _2, is transmitted respectively. Also, referring to the destination of the shared band registered in advance in the path table, the band is similarly transmitted to the corresponding IF. On the other hand, the communication data input from each IF is sent to the XC12. Since it also functions as a time-space switch, it is stored in a predetermined slot with reference to the path table of the XC12, and the framing signal as the slot data group becomes N
Sent to LT containing T.

[0009] Further, in the "communication system and communication method using a cross-connect network" in Japanese Patent Application Laid-Open No. 7-99541, a cell in the asynchronous transfer mode is formed by making a transit exchange secure a band for each call. There is disclosed a technology related to a cross-connect system that dynamically allocates a bandwidth without performing it.

[0010]

The bandwidth allocated to each terminal accommodated in such a conventional cross-connect system needs to be appropriately changed according to the communication status of each terminal. And with this change,
The communication processing throughput of the cross-connect system can be improved. For example, when it is known in advance that communication data from the first NT temporarily increases and communication data from a terminal accommodated in the LT 10 _N temporarily decreases, or when a plurality of terminals accommodated in the LT It is desirable that the band allocated to the limited framing signal can be appropriately changed, for example, when the band needs to be reviewed according to the change in the accommodation status.

In the conventional cross-connect system, when such an allocated band is changed, a band change notification is sent to each of the LTs 10 ₁ to 10 _N and each of the IFs 11 ₁ to 11 _N.
Needs to be performed for all the 11 _M and XC12.
In addition, as shown in FIG. 12, the non-band shared area 17 and the band shared area 18 assigned to each band are set to the left justification following the OH 15. Therefore, when the non-bandwidth shared area 17 is changed, the LTs 10 ₁ to 10 _N , I
There is a problem that band change processing is required in all of F11 _{1 to} 11 _M and XC12. FIG.
Thus, even if the bandwidth sharing area 18 and the non-bandwidth sharing area 17 are successively shifted after the OH 15, even when the bandwidth sharing area 18 that normally has a low frequency of change is changed, there is no need to change and the bandwidth is changed. Non-bandwidth shared area 17 with complex processing
The changes _{LT10 1 ~10 N, IF11 1 ~11} M, XC1
In all cases, there is a problem that the band change processing is required. Therefore, in order to be able to appropriately change the band allocated to the limited framing signal so as to obtain the optimum communication throughput by reviewing the band according to the change in the accommodation status of the plurality of terminals to be accommodated,
It is desirable that setting and changing of the non-bandwidth shared area 17 and the bandwidth shared area 18 can be simplified. However, Japanese Patent Application Laid-Open No. 7-99541 does not suggest or disclose any technology relating to this.

An object of the present invention is to provide a cross-connect system which simplifies a band change process in a non-band shared area allocated to each accommodation terminal of a framed signal and a shared band allocated to each accommodation terminal. is there.

[0013]

According to the first aspect of the present invention, (b) a shared transmission band with another terminal and a non-shared transmission band to which a transmission band unique to each terminal is allocated in advance. A plurality of terminals for transmitting and receiving one communication data;
(B) accommodating these terminals and setting the shared transmission band at the first slot position of the second communication data and the non-shared transmission band at the second slot position of the second communication data from the first communication data; A terminal terminator for performing data conversion between the first and second communication data by associating them with each other; and (c) a second terminal converted by the terminal terminator.
A time-space switch for exchanging data according to each slot position in the communication data of (3), (d) each slot position data exchanged by this time-space switch,
The cross-connect system is provided with an interface device for performing data conversion between the data exchanged and the third communication data by associating the communication data with a predetermined data position.

That is, according to the first aspect of the present invention, the first communication data includes: a shared transmission band that can be shared with another terminal;
A non-shared band to which a transmission band is assigned to each terminal is assigned in advance, and a plurality of terminals communicate with the terminal terminating device using the format of the first communication data. The terminal terminating device further includes a shared transmission band of the first communication data at a first slot position in the second communication data, and a non-transmission band of the first communication data at a second slot position in the second communication data. Data conversion between the first and second communication data is performed mutually by associating the shared transmission band with each other. The second communication data thus converted is subjected to data exchange in the time-space switch according to the slot position of the second communication data. Each slot data exchanged by the time-space switch is assigned to a predetermined position of the third communication data by the interface device, and performs data conversion with each other. As described above, the interface device converts the communication data into, for example, the third communication data that requires the prescribed network format configuration. , The bandwidth is secured so as not to depend on, and additional processing accompanying the bandwidth change can be reduced. Furthermore, even when a band is changed in the shared transmission band or the non-shared transmission band, each band can be changed or set independently.

According to a second aspect of the present invention, in the cross connect system according to the first aspect, the first slot position is the second slot position.
The second slot position is a position shifted to the beginning of the data area of the second communication data, and the predetermined data position is a position shifted to the end of the data area of the communication data of the third communication data. The data area is characterized by being shifted to the beginning of the data area.

That is, according to the second aspect of the present invention, in the second communication data between the terminal and the terminal terminating device, the shared transmission band is shifted to the end of the data area and the non-shared transmission is shifted to the head of the data area. Bandwidth was secured before each band. As a result, even when a band is changed in the shared transmission band or the non-shared transmission band, each band can be changed or set independently. Therefore, the processing required at the time of the band change processing is simplified. In addition, since the data is secured at the beginning and end of a predetermined data length, the bandwidth is very easily secured.

According to the third aspect of the present invention, in the cross connect system according to the first aspect, the first slot position is the second slot position.
The second slot position is a position shifted to the end of the data area of the second communication data, and the predetermined data position is a position shifted to the end of the data area of the second communication data. The data area is characterized by being shifted to the beginning of the data area.

That is, according to the third aspect of the present invention, in the second communication data between the terminal and the terminal termination device, the shared transmission band is shifted to the head of the data area and the non-shared transmission is shifted to the end of the data area. The band was secured after each band. As a result, even when a band is changed in the shared transmission band or the non-shared transmission band, each band can be changed or set independently. Therefore, the processing required at the time of the band change processing is simplified. In addition, since the data is secured at the beginning and end of a predetermined data length, the bandwidth is very easily secured.

According to a fourth aspect of the present invention, in the cross-connect system according to the second or third aspect, the first communication data is packet data or communication data of a subscriber telephone, and the third communication data is packet data. It is characterized by being data.

That is, according to the fourth aspect of the present invention, the terminals accommodated in the terminal terminating device are each assigned data of a data communication terminal or a subscriber telephone terminal in a unique manner and stored in a band. We mix with net. For example, in the case where the communication throughput can be greatly improved by flexibly changing the transmission capacity for the Internet network in which the communication capacity increases only for a predetermined time, such a bandwidth change process is simplified. The effect obtained by the conversion is also large.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows an outline of the configuration of a cross-connect system according to an embodiment of the present invention. This cross-connect system is a central equipment (Central Termin
al: hereinafter abbreviated as CT. ) 20. CT20
Are connected to a plurality of optical fiber transmission lines 21 _{1 to} 21 _K , and are respectively connected by optical multiplexer / demultiplexers 22 _{1 to} 22 _K to NT23 ₁₁ to NT23 ₁₁ to which are housed a plurality of subscriber telephone terminals or data communication terminals. _{23 1L, 23 21 ~23 2L,} ··
・_23K1 to _23KL are connected in multipoint.
Further, the CT 20 is connected to a subscriber telephone network 24 and a packet data network 25. The subscriber telephone network 24 is connected to a plurality of subscriber telephone terminals 26 _{1 to} 26 _M. The packet data network 25 includes a plurality of data communication terminals 27 _{1 to} 27 _N
Is connected. Thus CT20 is composed of a plurality of subscriber telephone terminal or communication terminal NT23 ₁₁
-23 _1L , 23 ₂₁ -23 _2L , ..., 23 _K1 -23
_KL and subscriber telephone network 24 or packet data network 25
It is possible to perform data exchange for communication with various terminals connected to the terminal.

[0024] Such CT20 accommodates a plurality of subscriber telephone terminal or a data communication terminal connected to a plurality of optical fiber transmission lines 21 ₁ ~21 _K LT28 ₁ ~2
8 _K. The CT 20 is connected to the subscriber telephone network 24.
I that is connected to the network and interfaces with the network 24
F29 _{1 to} 29 _P-1 are provided. Further, it is provided with a router IF 29 _P connected to the packet data network 25 and having a packet termination function and interfacing with the network 25. Then, each of the LTs 28 ₁ to 28 2
Data exchange between the 8 _K and various IF29 ₁ ~29 _P is to be carried out. Also, the CT 20 has a band setting control unit 31, and a band change process by the NT, LT, or IF is performed according to a band change instruction from the band setting control unit 31.

In the cross-connect system according to the present embodiment, a framing signal having a predetermined data length is transmitted to the X through the LT.
It is transmitted and received between C30 and NT. The band of the framing signal is previously divided into a non-band shared area that can be uniquely occupied by each NT and a band shared area that can be shared by each NT. For example, communication data having a high priority in each NT communicates using a band dedicated to the own NT in the non-band shared area. Further, when it is desired to communicate data that cannot be communicated only with the band dedicated to the own NT in the non-band shared area, communication is performed using the shared band. Since the shared band is a region that cannot be used by the own NT if occupied by another NT, it is generally used as a band used for communication of low priority data as communication data. . Further, as described above, the LT and each NT accommodated by the LT are connected in a point-to-multipoint manner by an optical multiplexer / demultiplexer, and the LT is a destination to the NT for a downstream signal from the LT to the NT. Broadcasting is performed using a framed signal in which NT identification information is described in the OH section. Therefore, each NT extracts communication data from the band previously allocated to the own NT for the non-shared band, and extracts communication data from the band when the own NT is permitted to use the shared band for the shared band. Will be. On the other hand, the upstream signal from the NT to the LT has its own N
The communication data of T is stored and transmitted to LT.

The XC30 is time space switch, each slot corresponding to each band such framing signal, referring to the path table indicating whether sending in advance what IF. Then, a slot as a corresponding band is transmitted to each IF. Conversely, framing is performed for each LT by storing the corresponding slot from each IF in the corresponding band. The slot transmitted to the corresponding IF by the XC 30 is subjected to the respective network interface processing, and is transmitted to the network as data in a predetermined format. In the case of the subscriber telephone network 24, for example, an integrated services digital network (Integrated Services Digital Network)
As a format format conforming to Digital Network (ISDN), if it is a packet data network 25, for example, it is transmitted as a format format conforming to the Internet Protocol (IP).

In the following, a description will be given of the main configuration and operation of each part of the cross connect system in the present embodiment.

FIG. 2 shows an outline of a configuration of a main part of the NT in this embodiment. NT23 in this embodiment
_{11 ~23 1L, 23 21 ~23 2L} , ···, 23 K1 ~23 KL
Is a subscriber telephone terminal or a data communication terminal, but the setting part of the shared band and the non-shared band and the operation thereof in this embodiment are the same. Where N
T23 ₁₁ will be described. The NT 23 ₁₁ includes a terminal ID holding unit 31 ₁₁ for holding identification information (IDentifier: hereinafter, abbreviated as ID) for identifying the own NT, and a band setting unit 32 ₁₁ for setting a communication band of the own NT. Have.
This band setting is performed based on an instruction from the band setting control unit 31.
It is performed according to the bandwidth setting notification from T28 _1. The transfer processing unit 33 ₁₁ refers to the terminal ID holding unit 31 ₁₁ and
The identification ID of the NT as a transmission source to the OH portion and the like describing, performs transmission processing of transmission data from NT23 _11. Further transfer processing unit 33 ₁₁ performs reception processing of the received data from LT28 ₁ with reference to the allocated bandwidth stored in the shared bandwidth holder 34 ₁₁ or non-shared bandwidth holder 35 ₁₁ of the band setting unit 32 ₁₁ . Also, the shared band holding unit 34 _{1 1}
Holds, in addition to the above-mentioned allocated band, shared band use permission information indicating whether or not the use of the shared band is permitted to the own NT. The shared band use permission information is the terminal identification ID of the NT to which the use of the shared band is permitted at that time. The shared bandwidth usage permission information is adapted to be held those described in the OH portion of the transmission data from the LT28 _1.

NT23 which enables such transfer processing
Reference numeral ₁₁ denotes a central processing unit (Central Processing U)
nit: Hereinafter abbreviated as CPU. ), And an external storage device such as a magnetic disk or a read-only memory (hereinafter referred to as RO) provided separately therefrom.
Abbreviated as M. ) Can be executed based on a program stored in a predetermined storage device.

FIG. 3 shows a case where the data is stored in such a predetermined storage device.
NT23₁₁This is an outline of the transfer process of
You. First NT23₁₁Is LT28₁Broadcasters from
It is determined whether a strike has been received (step S40).
0). This broadcast is LT28₁From this to
Multiple NT23s connected in multipoint₁₁~ 23
_1LIs the data sent to
In the OH part, the destination NT indicating the NT which is the destination of the transmission data
Information is described. Then, refer to the destination NT information.
To determine whether it is communication data addressed to the own NT.
Separate. That is, LT28₁Broadcast more
When received (step S40: Y), NT23₁₁Unique
I that stores the identification information assigned to
D holding unit 31₁₁(Step S401), and the own N
It is determined whether or not the received data is addressed to T (step
S402). This received broadcast is addressed to own NT
Is determined (step S402: Y),
Or shared band holding unit 34 ₁₁Shared bandwidth held in
The own NT permits the use of the shared band by referring to the use permission information.
If it is, the shared band holding unit 34₁₁Shared bandwidth
From the pre-allocated band to the own NT.
The received data is extracted (step S403). In addition,
Communication in non-shared band allocated exclusively for NT
Data should be extracted regardless of its allocation status.
Can be. On the other hand, in step S402,
That the broadcast was not addressed to its own NT
(Step S402: Y), and the shared band holding unit 34
₁₁Refer to the shared band use permission information held in
If the NT is not authorized to use the shared band,
And monitor for broadcast reception (return). S
The received data extracted in step S403 is
33₁₁Performs a predetermined receiving process (step S
404). For example, NT23₁₁Is a subscriber telephone terminal
Audio output corresponding to the received data is performed, and data communication is performed.
If it is a terminal, it will be used for the response process.

If no broadcast is received in step S400 (step S400: N), the NT23
It is determined from step ₁₁ whether data to be transmitted has occurred (step S405). For example, from NT23 ₁₁ to C
Via T20, it is possible to detect whether or not data to be transmitted to the network to which the desired destination is connected is stored in a transmission buffer or the like and to determine this. N
When transmitting communication data from T to the LT using the shared band, the client side is NT, the server side is LT, and the NT sends a transmission request to the LT.
This transmission request includes the terminal identification ID of the NT that sent the transmission request. In response to this transmission request, the LT sends its N
The terminal identification ID that sent the transmission request to T
Reply the transmission request response included in the section. In response to the transmission request response, the NT divides the transmission data into packets that are allocated in advance as a shared band and transmits the divided data. On the other hand, when transmitting using the non-shared band allocated to the own NT beforehand,
Transmission is performed using a dedicated band. Therefore, when it is determined in step S405 that data to be transmitted from the NT23 ₁₁ has occurred (step S405: Y),
First, it is determined that a transmission request response has been received from the LT (step S406). Then, when it is determined that the transmission request response has not been received from the LT (step S
406: in N) is, LT28 ₁ sends out a packet transmission request as described above for (step S407), waiting to be received transmission request response again (return, step S400: N, Step S405: N). On the other hand, in step S406, the received packet transmission request response in response to the packet transmission request transmitted in step S407 from LT28 _1, referring to the packet transmission request terminal identification ID of the transmission request sending NT included in the transmission request response when the response is determined to corresponds to the packet transmission request transmitted from the own NT: (step S406 Y), using a band held in the shared bandwidth holder 34 ₁₁ (step S408), transmission A predetermined transmission process of data to be performed is performed (step S409). Thereafter, reception of the broadcast is monitored again (return).

[0032] In step S405, when it is judged that there is no data to be transmitted from NT23 ₁₁ (step S40
5: N), it is determined whether there is a band setting instruction from LT28 ₁ (step S410). When there is a band setting instruction (step S410: Y), predetermined non-shared band securing processing corresponding to each of the shared band and the non-shared band is performed (step S411), and when there is no band setting instruction (step S410: In N), the reception of the broadcast is monitored again (return).

The framed signal transmitted and received by the NT is multiplexed by the XC 30 into a slot to which data from each network is allocated in advance, and is interface-converted by the LT. First, the main configuration of the XC 30 will be described.

FIG. 4 shows an outline of a main configuration of the XC 30 in this embodiment. X in this embodiment
C30 is a switch unit 40 which is a time-space switch as described above, LTs 28 _{1 to} 28 _K, and various IFs 29 ₁ to 29
9 _P path table 4 that have registered switching path
1 and a path setting unit 42 for changing the registered contents of the path table 41. In the path table 41,
The slot corresponding to each band of the framed signal is
Information on whether or not to switch the path to F is stored.
Therefore, the framed transmission signal transmitted from the NT is divided and output to each IF for each corresponding slot. On the other hand, data input from each network via various IFs is multiplexed based on the destination information attached thereto and transmitted as a framed signal to the LT accommodating the corresponding NT by the XC 30. . Also, for communication data transmitted from NT using the shared band,
It may be notified in advance to which NT the shared band is allocated, and correspondingly set in the path table,
Alternatively, the destination of the shared band may be determined and switching to the corresponding IF may be performed. When the shared band is changed, path setting is performed based on the changed shared band, and the path table 41 is changed by the path setting unit 42.

By the way, in the XC 30 of this embodiment,
In communication data transmitted and received with the LTs 28 _{1 to} 28 _K , a non-shared band is left-justified in the data area, and a shared band is right-justified in the data area. In the communication data transmitted / received to / from the various routers 29 _{1 to} 29 _P , the shared band is left-justified to secure a predetermined band. That is, in the data area of the framing signal, the non-shared band or the shared band secures a band at the beginning or end thereof, so that even if a change in one band occurs, it is not necessary to perform a change process on the other band It is characterized by doing so.

The LT connected to such an XC 30 is:
O serving as a control signal for a framed signal with NT
Interface processing such as addition of an H part and predetermined format conversion is performed.

FIG. 5 shows an outline of a configuration of a main part of the LT in this embodiment. LT2 in this embodiment
8 ₁ ~ 28 _K is the same configuration. It will be described here LT28 _1. LT28 ₁ houses NT23 ₁₁ to 2
The OH portion necessary for transmitting and receiving packet transmission request and its response between 3 _1L has a frame processing unit 43 ₁ that performs addition or deletion to the frame data unit. The frame data portion is a data portion in a state where the packet data input via the network is multiplexed by the XC 30. Further LT28 _1, the bandwidth setting section 46 for setting a non-shared bandwidth shared band for a shared band holding unit 44 _1, or for non-shared bandwidth holder 45 ₁ by the band setting instruction from the band setting control unit 31 Has _one .
In addition, the NT table 47 _1, N where LT28 ₁ accommodates
T23 ₁₁ ~ 23 _1L terminal identification ID of the is stored, is referred to when the OH portion in the frame processing unit 43 ₁ is added. The data thus framed in the will be transmitted to the transmission direction from the transfer processing unit 48 _1. Frame processing unit 43 ₁ refers to the shared bandwidth or non-shared bandwidth held in the shared bandwidth holder 44 ₁ or unshared band holding unit 45 _1, the assembly of the data as a frame signal of a predetermined frame structure And extract. The transfer processing unit 48 ₁ has a transmission / reception control unit 49 ₁ , and performs permission control of transmission from the NT by receiving a packet transmission request in the shared band from the accommodated NT and transmitting the request response.

The LT 28 _{1 having} such a configuration is compatible with the NT 23
When receiving a framed signal sent from _11, and outputs the frame processing unit 43 ₁ through the transfer processing unit 48 _1.
Referring to OH portion in the frame processing unit 43 _1, it transmits the frame data portion obtained by removing the OH portion if normal communication data as it is to the XC30. Since this OH section is used for transmission control with the accommodated NT, it is an unnecessary part after the XC30. On the other hand, the frame data inputted from the XC30, when the NT to be the destination to NT Table 47 ₁ by referring to the destination information is stored, broadcasts describes that its NT addressed to OH portion I do. As described above, each NT can receive this broadcast and refer to the OH section to determine whether or not the communication data of the shared band is transmission data addressed to the own NT.

LT that enables such transfer relay processing
28 ₁ has a CPU (not shown), so that it can perform various controls based on a predetermined program stored in the storage device such as provided separately from ROM and external storage device or it, such as a magnetic disk Has become.

[0040] Figure 6 is a diagram showing an outline of the transfer relay processing LT28 ₁ stored in such a predetermined storage device. First LT28 ₁ monitors the reception of frame data from the XC30 addressed one of the plurality of NT accommodating (step S500). This refers to the destination information of the frame data received from the XC 30, and uses the NT table 47.
Self LT ₁ it is determined whether or not the communication data NT addressed to houses. When this reception is detected (step S500: Y), an OH portion including various control information is newly added to the head of the reception and broadcast is performed (step S501), and the reception of frame data from the XC 30 is performed again. Monitor (return). Here, the newly added OH section is communication control information for error detection and for specifying the type of communication data that is predetermined only between the LT and the NT.

On the other hand, in step S500, the
If no reception is detected (step S500: N), LT
28₁NT23 to accommodate₁₁~ 23_1LSend from either
The reception of the communication data is detected (step S502). this
The shared band in the transmission data from NT is set in advance to NT.
During the transmission request and the response control thereof, LT28 ₁
Have been stored in the shared band from only NTs that
Effective communication data is received.
₁In the transmission request and the NT permitted by the response control,
Reception control unit 49₁Remember in. Non-shared zone
The transmission data of each NT in the area is received at any time and X
Send to C30. The transmission data from the accommodated NT
When the data is received (step S502: Y),
Such transmission request and response control with reference to the OH section
The transmission data from the NT where the
Frame, extracted from the shared band
Frame processing section 43₁To delete the OH section.
Step S503), LT to XC and various IFs in advance
A framed signal of a predetermined format
(Step S504).

When the transmission data from the NT is not received in step S502 (step S502: N), the packet transmission request is monitored from the NT (step S505).
That is, as described in FIG. 3, upon receiving the NT is a client-side wishing to transmit using a shared bandwidth is performed on LT28 ₁ by adding the transmission request information to the OH portion request (step S505: Y), a predetermined transmission permission preparation process is performed (step S506). As the permission preparation processing, there is a processing of canceling the transmission permission for the currently permitted NT. When the transmission permission preparation process is completed in this way, a response to the packet transmission request is made with the shared band use permission information of the OH section permitted, so as to respond to the packet transmission request (step S507). Usually, the terminal ID of the NT that is permitted to use is described in the shared band use permission information.

If it is not a packet transmission request from the NT in step S505 (step S505: N), a band setting instruction from the band setting control unit 31 is detected (step S508). And when this is detected: (step S508 Y) changes the respective bands that are held in the shared bandwidth holder 44 ₁ or unshared band holding unit 45 ₁ (step S509). However, when this is not detected (step S508: N), reception from the XC 30 is monitored again (return).

The communication data transmitted and received between the NT and the LT described above is switched by the XC 30 and various IFs are transmitted.
Interface is performed with the network connected by 29 ₁ ~ 29 _P. The IFs 29 _{1 to} 29 _P in the present embodiment are node IFs or router IFs.
Performs interface conversion with the ISDN network, and
F performs interface conversion with the packet data network.
Hereinafter, the router IF will be described.

FIG. 7 shows an outline of a main configuration of the router IF according to the present embodiment. Router IF29 _P
Has a packet processing unit 50 _P for performing format conversion between the packet data network connected. Further, the router IF 29 _P assigns the shared band to the shared band holding unit 51 _P according to the band setting instruction from the band setting control unit 31.
And a band setting unit 53 _P for setting a non-shared bandwidth to or unshared band holder 52 _P. Format converted communication data will be transmitted in the transmission direction by the transfer processor 54 _P. Further, in the accommodated NT table 55 _P , identification information of an NT serving as a destination of communication data from the packet data network 25 accommodated by the CT 20 is stored.
Bands to be stored are stored in association with each other. Therefore, when the inputted communication data from the packet data network 25, determines the destination by referring to the accommodated NT Table 55 _P from OH portion is predetermined in the packet data network 25, it is determined this advance Store in band.

By the way, various IFs 29 ₁ in this embodiment are used.
In ~ 29 _P, in the communication data to be exchanged with the XC30 As described above, in packed after unshared band data area, shared bandwidth in left-justified in the data area, so that a predetermined band are respectively secured It is characterized by having. That is, in the data area of the framing signal, the non-shared band or the shared band secures a band at the beginning or end thereof, so that even if a change in one band occurs, it is not necessary to perform a change process on the other band Like that.

Next, a cross-connect system having such a main configuration will be described in detail with reference to FIG.

FIG. 8 schematically shows a cross-connect system for explaining the band allocation of this embodiment. However, the same parts as those of the cross connect system in FIG.
The maximum transmission band a between the LT 28 ₁ and the XC 30 is LT LT
28 is a maximum _{bandwidth 1} also can be processed. Among these, it is assumed that the non-shared band b and the shared band c are respectively allocated. The shared band c includes a plurality of Ns accommodated by the LT 28 _1.
It indicates that the band shared by T23 ₁₁ ~ 23 _1L. If the shared band c is switched to the router IF 29 _P as it is, the XC 30 and the router IF 2 are switched according to the band switched from each LT.
Shows that can be transmitted up to the maximum transmission bandwidth d between 9 _P.

FIG. 9 shows an outline of a frame structure of a framing signal between the LT and the XC. FIG. 7A is a diagram showing a frame configuration of a framing signal between the LT and the XC in the present embodiment. FIG.
It is a figure which shows the frame structure of the framing signal after changing the band of the non-shared band allocated to 2nd NT with respect to FIG. FIG. 7C is a diagram showing the frame configuration of the framing signal after changing the band of the shared band with respect to FIG. Framed signal 6 in this embodiment
In 0, an OH area 62 in which control information is described for a predetermined framing signal band 61 and a data area 63 are allocated. In the data area 63, a non-bandwidth shared area 64 uniquely allocated to each terminal is secured at the left justification, and a bandwidth shared bandwidth 65 shared by each terminal is secured at the leftmost justification. The band area is an unused area 66 as an area to which a band can be further allocated.

By the way, the second N
When an instruction to change the non-shared band of T is issued, the change is instructed to the LT, XC and various IFs accommodating the second NT. As a result, as shown in FIG.
Only the non-shared band of T is changed (area 67), and only the unused area 68 is reduced, so that no change processing is necessary for the shared band that is ensured by justification. On the other hand, when there is an instruction to change the shared band from the band setting control unit 31, this is instructed to change the band to each LT, XC and various IFs. As a result, only the shared band is changed as shown in FIG. 9C (area 69), and only the unused area 70 is reduced, and no change processing is performed on the non-shared band 64 secured in the MSB. No need. As described above, when changing the band, band change processing independent of each other can be performed.

FIG. 10 shows an outline of a band setting sequence of the cross-connect system in this embodiment. First, the band setting control unit 31 is connected to a management device (not shown), and notifies the LT, the XC 30, and the IFs of a shared band setting instruction by a specific operator such as an administrator (notification 80). This may be achieved by using a dedicated notification signal line, or may be notified via a transmission path as management communication data having a predetermined format configuration. The LT that has received such a shared band setting instruction refers to the NT table and issues a shared band setting instruction to each NT (setting 81). XC30
Changes the path of the path table 41 according to the shared bandwidth to be set when receiving this (path setting 82). In other words, in the LT direction, the securing of the shared band is postponed,
For each of the IF directions, the path setting unit 42 is configured to set the corresponding switching path so that the securing of the shared band is justified. Upon receiving the shared bandwidth setting instruction, the various IFs prepare for securing the bandwidth in the shared bandwidth holding unit (securing 83).

The LT which refers to the NT table and instructs the accommodated NT to set the shared band first sends a shared band securing request 84 to the NT, and a bandwidth securing request response 85 from the NT responds to the request. For the first time after the reception, the shared band holding unit performs a band securing preparation for holding the band value (secure 86). Further, the LT can simultaneously transmit the band change timing 87,
The NTs, XCs, and IFs that have received this are permitted to use the shared band secured at the same time at this timing. As described above, the shared band can be set independently of the non-shared band, and the other band change process required after changing one band as in the related art is unnecessary.

As described above, the cross-connect system according to the present embodiment allocates the bandwidth of communication data, which was conventionally required to be left-justified in the NT or network, and sets the shared area and the non-shared area when performing the cross-connect. Band allocation is performed once for left justification and once for left justification.
As a result, the shared band and the non-shared band can be set or changed independently of each other, so that it is not necessary to perform the other band changing process accompanying the one band setting or changing process. . Further, the band change control of the XC, which has been complicated so far, is greatly simplified.

In the cross-connect system according to the present embodiment, the shared band is shifted to the left between the LT and the XC, the non-shared band is shifted to the front, and the shared band between the XC and each IF is shifted to the justified band. However, the present invention is not limited to this. That is, it is only necessary that the shared area and the non-shared area in the data area can perform band allocation such that the change processing of the other area does not accompany the change of the other area. It is also possible to secure the band by shifting the band to the last and to shift the shared band between the XC and each IF to the first. Also, by securing the data area not at the beginning and end but at a predetermined position, it is possible to obtain a sufficient effect according to the applicable range, although the flexibility of the band change is inferior.

Further, the communication data of the shared band in this embodiment is described as being left-justified or left-justified with respect to a predetermined framing signal band. However, between the LT and the XC 30, this framed signal is left-justified or left-justified with respect to the maximum transmission band of the LT, and the router IF
Switching between the shared bands from a plurality of LTs during the period 0 allows the MSB to be shifted up to the maximum shared band in which the transmission band is determined. In this case, the band change width in the shared band or the non-shared band can be maximized.

[0056]

As described above, according to the first aspect of the present invention, at the time of data exchange, a band is secured so that the shared band and the non-shared band of a plurality of terminals do not depend on each band change. By doing so, it is possible to reduce the additional processing associated with the band change. Furthermore, even when a band is changed in the shared transmission band or the non-shared transmission band, each band can be changed or set independently.

According to the second or third aspect of the present invention, even when a band is changed in the shared transmission band or the non-shared transmission band, each band can be changed or set independently. Become like Therefore, the processing required at the time of the band change processing is simplified.
In addition, since the data is secured at the beginning and end of a predetermined data length, the bandwidth is very easily secured.

According to the fourth aspect of the present invention,
Since it can be applied to the Internet network where the communication capacity increases only for a predetermined time, the transmission capacity can be flexibly changed by the simplified band change processing, and the throughput of the communication processing can be greatly improved. Will be able to

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a configuration of a cross-connect system according to an embodiment.

FIG. 2 is a configuration diagram illustrating an outline of a main configuration of an NT according to the present embodiment.

FIG. 3 is a flowchart illustrating an outline of an NT transfer process in the embodiment.

FIG. 4 is a configuration diagram illustrating an outline of a main configuration of an XC according to the present embodiment.

FIG. 5 is a configuration diagram illustrating an outline of a main configuration of an LT according to the embodiment;

FIG. 6 is a flowchart illustrating an outline of an LT transfer relay process according to the embodiment;

FIG. 7 is a configuration diagram illustrating an outline of a main configuration of a router IF according to the embodiment;

FIG. 8 is an explanatory diagram for explaining band allocation of the cross-connect system in the embodiment.

FIG. 9 is a frame configuration diagram illustrating an outline of a frame configuration of a framing signal according to the present embodiment. (A) A frame configuration diagram of a framing signal according to the present embodiment, (b) a frame configuration diagram of a framing signal after a non-shared band is changed in the present embodiment, and (c) a framing after a shared band is changed in the present embodiment. FIG. 3 is a diagram illustrating a signal frame configuration.

FIG. 10 is a sequence diagram of setting a shared band in the embodiment.

FIG. 11 is a block diagram showing an outline of a configuration of a conventional cross connect system.

FIG. 12 is a frame configuration diagram showing a configuration of a conventional framing signal.

[Explanation of symbols]

Reference Signs 20 CT 21 _{1 to} 21 _K optical fiber transmission line 22 _{1 to} 22 _K optical multiplexer / demultiplexer 23 ₁₁ to 23 _1L ,..., 23 _K1 to 23 _KL NT 24 Subscriber telephone network 25 Packet data network 26 _{1 to} 26 _M Subscriber telephone terminal 27 _{1 to} 27 _N data communication terminal 28 _{1 to} 28 _K LT 29 _{1 to} 29 _P-1 node IF 29 _P router IF 30 XC 31 Band setting controller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 AA11 LL02 LL11 MM12 RR01 RR02 TT01 5K030 GA03 HA08 JA12 KX01 KX04 KX28 LB05 5K051 AA03 DD09 FF11 GG06 GG15 JJ09 5K069 AA18 BA03 CB04 FB08 DB11 DB11

Claims (4)

[Claims] 1. A plurality of terminals for transmitting and receiving first communication data in which a shared transmission band with another terminal and a non-shared transmission band to which a transmission band unique to each terminal is allocated in advance, and these terminals And the shared transmission band is associated with the first slot position of the second communication data and the non-shared transmission band is associated with the second slot position of the second communication data from the first communication data. A terminal terminating device for performing data conversion between the first and second communication data by using the terminal terminating device; a time-space switch for exchanging data according to each slot position in the second communication data converted by the terminal terminating device; The data exchange is performed by associating each slot position exchanged by the time-space switch with a predetermined data position of the third communication data. A cross-connect system comprising: an interface device for performing data conversion between the obtained data and the third communication data. 2. The first slot position is shifted to the end of the data area of the second communication data, and the second slot position is shifted to the beginning of the data area of the second communication data. The predetermined data position is a third position.
2. The cross-connect system according to claim 1, wherein the position of the communication data is shifted to the beginning of the data area of the communication data. 3. The first slot position is a position justified to the head of a data area of second communication data, and the second slot position is a left position of a data area of the second communication data. The predetermined data position is a third position.
2. The cross-connect system according to claim 1, wherein the position of the communication data is shifted to the beginning of the data area of the communication data. 4. The communication system according to claim 2, wherein said first communication data is packet data or communication data of a subscriber telephone, and said third communication data is packet data.
Or the cross-connect system according to claim 3.