JPS63138899A - Automatic exchange of decentalized control system - Google Patents

Abstract

PURPOSE:To attain the exchange of channels on a digital multiplex communication line by activating a digital multiplex exchange switch means, a port means, a control means and a transfer path means in common. CONSTITUTION:A port means 33(33A - 33D) issues various requests such as a call connection request to a control means 34 through a control signal path 36 and a transfer path means 35. The control means 34 gives a connection command to a digital multiplex exchange switch means 32 in response to the requests, sets a channel on the digital multiplex channel between relevant port means 33 to apply the control such as setting of call connection and transfer of transfer data. The digital multiplex exchange switch means 32, the port means 33, the control means 34 and the transfer path means 35 are operated together in this way to apply the exchange between channels on the digital multiplex communication line.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to automatic switching equipment, more specifically, a digital line switching system using a storage program control method, a packet switching system, and an integrated switching system that integrates both. This paper relates to a distributed control system for automatic exchanges.

(Conventional technology) Distributed control methods in conventional circuit switching systems include:
There is a 070 type automatic exchange machine. For example, Okita et al.
Overview of D7070 type automatic exchange book fee)” Oki Electric Research and Development,
Volume 52, No. 1, pp. 45-52 (January 1985)
This is shown schematically in FIG. 8 in order to increase call processing capacity.

It uses a distributed control method using a multiprocessor configuration. For switching processing, call control processor GNP,
Functional distribution control is performed by the subscriber line signal processor LIP and medium line signal processor TSP, and load distribution control is performed by a plurality of call control processors. Communication between each processor is performed via an interprocessor communication control device IPC and a processor communication bus 10.

Control system equipment such as switched communication line equipment, call control processor, subscriber line signal processor and trunk line signal processor, and software functions in each processor are divided as shown in FIG. 1θ.

For example, in the system shown in FIG. 8, subscriber telephone 4!
When a call is made from 112A, the subscriber line signal processor LI
P, a joint operation of the call control processor GNP and the interprocessor communication control device IPC establishes a connection from the calling subscriber 12A to the subscriber line signaling device LsE via the concentrator switch LC9W, the intra-office highway 14 and the time division switch TDSW. The selected digits are received from the calling subscriber 12A by the subscriber line signaling device LSE and the subscriber line signal processor LIP.

The received selection digits are interpreted in the call control processor GNP. As a result of the IN translation, for example, if the call is within the local station to subscriber 12B, subscriber line signal processor LNP, call control processor GNP, and interprocessor communication control unit δ
Through the joint operation of the IPG, from the calling subscriber 12A to the line concentrator switch tcsw, the intra-office highway 14, the time division switch TDSW, the intra-office highway 14 and the solid line switch LC.
A connection to the called subscriber 14b is established via the SW. This allows communication between the originating subscriber 12A and the terminating subscriber 12B.

On the other hand, as a distributed control method in a conventional packet switching system, there is a 051 type packet switch.

For example, "rD51 type packet switch by Niwa et al.," Oki Electric Research and Development, Vol. 53, No. 4, pp. 77-82 (1
(October 988), whose configuration is schematically shown in FIG.
A distributed control method using a multiprocessor configuration is used. Regarding packet switching processing, load distribution control is performed by a plurality of processing processors PPu. Packet transfer and communication in each processor 1m is performed via an inter-processor communication link 20 and a communication link control unit LSCT.

(Problem to be solved by the invention) But in such a traditional exchange system.

There were two main problems as follows.

That is, firstly, in both the above-mentioned function distribution and load distribution, each control processor has a wide range of functions, and therefore the software of each control processor is large-scale and has a complicated configuration. Furthermore, when introducing a new terminal type, line type, signal system, or service to an existing system, a large amount of man-hours and time are required to develop software that must be added.

Second, the processing capacity of the switching system is limited by the processing capabilities of the processors and the communication capabilities of the interprocessor communication controllers, interprocessor communication buses, and communication links due to the multiprocessor configuration. Therefore, these are factors that hinder the increase in the capacity of switching equipment. In addition, when trying to increase processing capacity, inter-processor communication control devices,
The complicated configuration of the inter-processor communication bus and communication links has led to a particularly complicated hardware configuration.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic switching system using a distributed control system that can overcome these drawbacks of the prior art and easily adapt to changes in service conditions and/or increases in the scale of stations.

More specifically, the first objective is to provide a decentralized automatic switching system that has a simple software configuration and can easily change service conditions such as new terminal types, line types, signaling systems, or services. shall be.

In addition, without using a complex interprocessor communication control device, interprocessor communication bus, or communication link,
An object of the present invention is to provide an automatic switching system using a distributed control method that can increase switching capacity.

(Means for Solving the Problems) The distributed control type automatic switching system according to the present invention accommodates a plurality of digital multiplex communication channels having a digital multiplex channel configuration in which channels in which digitized communication information is arranged are multiplexed. A digital multiplex exchange switch means that exchanges between channels on a multiplex communication path in response to a connection instruction, and a digital multiplex communication path from the digital multiplex exchange switch means.
port means for autonomously controlling and managing the service-oriented unit; and a bus connection between channels on the digital multiplex communication path in the exchange switch means, which is connected to the digital multiplex exchange switch means and provides the connection instruction to the exchange switch means. and transfer path means for transferring a control signal between the control means and the digital multiplex switching means, and the digital multiplex switching means includes at least one control signal on the digital multiplex communication path. A control signal path for transferring control signals between the transfer path means and the port means using the channel is semi-solidly established, and the port means.

transmitting and receiving control signals to and from the control means using the control signal path;
The control means and the transfer path means cooperate to exchange channels on the digital multiplex communication path.

(Function) According to the present invention, the port means issues various requests such as a call connection request to the control means through the control signal path and the transfer path means. The control means gives connection instructions to the digital multiplex exchange switching means in response to these requests, sets up channels on the digital multiplex communication path between the related port means, and controls the setting of call connections and the transfer of transferred data. Let's do it.

In this way, the digital multiplex switch means, the port means, the control means and the transfer path means work together to perform inter-channel exchange on the digital multiplex communication path.

(Embodiment) Next, an embodiment of a distributed control automatic switching system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of an automatic switch using a distributed port control method according to the present invention, that is, an example of a system configuration.
It has a digital multiplex exchange switch or bearer switch 32 in which a bearer switch 32 is accommodated. The universal port interface 31 has a digital multichannel configuration in which bearer channels, that is, channels in which digitized communication information can be arranged, are multiplexed. The bearer switch 32 is a digital multiplex switch that is controlled by the control processor 34 and has a function of performing exchange operations between bearer channels on a communication path in response to a connection instruction from the processor 34.

The control processor 34 has a bearer switch/control processor interface 35. and is connected to the bearer switch 32 by a connection order interface 38 that provides a connection order to the bearer switch 32;
This is a control processor that has the function of controlling 2 and controlling connections between pairer channels. interface 3
5 is a transfer path for transferring control signals between the control processor 34 and each port 33A to 33D, and is accommodated in the bearer switch 32.

The bearer switch 32 includes a control signal path for transferring control signals between the ports 33A to 330 and the control processor 34, as shown by a dotted line 3B.
It is set semi-fixed according to instructions from Bearer switch 32 also includes port 33A, as shown by line 37.
.about.33D are connected to the control processor 34 at each stage of the call connection process.
It is set according to instructions from.

Various ports 33A to 33D are connected to the universal port interface 31. Port 33A~3
Among switching functions, 3D is an autonomous function of controlling and managing subscriber lines, an autonomous function of controlling and managing trunk lines, an autonomous function of controlling and managing signals between subscriber lines and trunk lines,
In this specification, a subscriber line, a trunk line, among various exchanges realized by an exchange, is a device having an autonomous function of service control and management, or a function that combines these functions.

Signals between subscriber lines and trunk lines, and functions such as service control and management are referred to as line and service oriented functions, that is, ``line/service oriented functions''. In this case, "line" is broadly interpreted to include subscriber lines, trunk lines, and subscribers themselves, and "service" is defined as "service".

For example, it is interpreted as a broad concept that includes not only conference call services, but also subscriber terminal type, data speed, etc.

The ports 33A to 33D are connected to the bearer switch 32 via a digital communication path with a digital multichannel configuration. The ports 33A to 33D transmit and receive control signals to and from the call control processor 34 through the interface 35 and the semi-fixed path 36 using one or more of the bearer channels on this communication path.
has f=.

Port 33A is a subscriber line port that accommodates subscriber fi 313A, and port 33B is an intermediate line port that accommodates trunk line 39B. In addition, port 33C is a signal port, and port 330 is a service port.Although not shown, a merged port that selectively combines multiple functions of these four types of ports is used as a bearer port. 411 functions in this embodiment of these four types of ports 33A to 33Ω that may be accommodated in the switch 32,
The control unit and the structural unit are illustrated in FIG. Although only one port 33A to 33t1 is shown in FIG. 1, a plurality of ports 33A to 33t1 may be provided depending on external conditions such as traffic, route, and service.

The bearer multiple channel on the universal port interface 31 has a configuration as shown in FIG. 2 in this embodiment. Ports 33A to 33D and bearer switch 3
The bearer multiplex channel transmitted in the upstream and downstream directions between the two
, bearer channel number (H
a, Nb) 42. Effective data length (!a
, lb), and data 44 indicating its effective length.

These are only examples of specific bearer multichannel configurations on the universal port interface 31 in this embodiment, but one bearer multichannel configuration applicable in the present invention is that the ports 33A to 33D and the bearer switch 32 Any configuration can be used as long as the data placed on a particular bearer channel can be completely identified; for example, a frame-synchronized time-division multiplexing channel configuration used in conventional circuit switching can be used. Alternatively, a frame asynchronous time division multiplex channel configuration is also applicable. Further, the bearer switch 32 used in the method according to the present invention is one that can connect any channel in the applied bearer multichannel configuration.
Any configuration is applicable.

FIG. 12 shows an example of the division of functions among the various ports 33A to 33D, the bearer switch 32, and the control processor 34 in the system according to the present invention, in comparison with that of the conventional distributed control circuit switching system described above.

Referring to FIG. 3, there is shown an embodiment in which the scheme according to the invention is applied to a circuit switching system, and in subsequent figures similar elements to those shown in FIG. 1 are designated with the same reference numerals. In the same embodiment, the bearer switch 32 includes an analog subscriber line port 33Al and an analog trunk line port 33.
B1. A PB signal port 33CI and an IIF signal port 33C2 are accommodated.

Analog subscriber line port 33A1 is for analog subscriber 1
It accommodates the i39A1 and has built-in analog subscriber circuitry with so-called BOR9CHT functionality. BOR9C
The RT functions include communication current supply, overvoltage protection, calling signal transmission, monitoring, digital encoding/decoding, 2-wire/4-wire conversion, and testing functions. The subscriber circuit 33A1 controls and manages this subscriber circuit by storage program control or firmware control.

It has a function of converting information from the subscriber line 38A1 and digital communication information placed in the bearer channel on the universal port interface 31.

3381 is analog trunk line 3
It houses an analog trunk circuit with functions such as call current supply, monitoring, digital encoding/decoding, and 2-wire/4!51 conversion. Same hoard 33B
This trunk circuit is also controlled by storage program control or firmware control, and the middle Jl line 3981
It has a function of converting information from the terminal and digital communication information placed in the bearer channel on the universal port interface 31.

The 33CI receives digitized pushbutton dialing (PB) signals and subscriber monitoring information placed on the bearer channel on the universal port interface 31 and generates a dial tone and a callback or ring tone. It has a built-in signal processing device that has a sending function. The 33CI also has the function of controlling and managing the i processing device through stored program control or firmware control.

IF signal port) 33C2 has a built-in signal processing device that has the function of receiving and transmitting digitized multi-frequency (MF) signals and monitoring information placed in the bearer channel on the universal port interface 31, and has a storage program control function. Alternatively, it has a function of controlling and managing this signal processing device through firmware control.

These ports 33A1 to 33C2 are accommodated in the bearer switch 32 by the universal port interface 31. Voice, subscriber monitoring and control information are transported by bearer channels 5A-5G thereon, respectively. The symbols of the universal port interface 31 and the bearer channels 5A to 5G are shown in FIG. 4. The bearer switch 32 has a communication interface for interconnecting the bearer channels 5A to 5G under the control of the control processor 34 according to the call signaling process. Paths 5H to 5M are set.

In this embodiment, a contact bA operation based on a call from a PB telephone will be explained as an example.

(1) Call detection operation The analog subscriber line port 33^l detects the PR telephone 51 connected to it through the analog subscriber line 39A1.
When a call is placed, it is detected and notified to the control processor 34 via the control signal path 36 of the analog subscriber line port 33A1. The control processor 34 thereby performs an outgoing service analysis and provides information on whether outgoing calls are allowed or not.
Return to 3A1.

If the transmission is possible, the originating subscriber line port 33A1 captures the bearer channel 5A and requests the control processor 34 to select the PB signal port 33CI via the control path 3B. The control processor 34 selects one of the plurality of PB signal ports (33CI) accommodated in the bearer switch 32 and instructs resource acquisition via the control signal path 3B.

The PR signal port 3301 checks the availability of PB signal resources, and if there is availability, captures the bearer channel 5B. Control processor 34 reports its results to originating subscriber line 33A1 via control signal path 3B.

Therefore, the originating subscriber line port 33A1 is connected to the control signal path 3.
6 to the control processor 34 via the Pa signal port 33C.
Request for setting communication path 5H with I, Pa signal port 3
The communication path 5H that transfers the activation request and operation mode designation information of 301 has a communication capacity that can transfer voice information, subscriber circuit control information, and monitoring information. In response, the control processor 34 sends a connection order for the communication path 5H to the bearer switch 32, and
The activation request and operation mode designation information are transferred to the 33CI via the Pa signal (Pa signal port).

(2) PB dial reception operation (Pa signal port) 3301 is the originating subscriber port (33A1) via the communication path 5H according to the specified operation mode
In addition to transmitting a dialable signal, that is, a dial tone,
Monitoring of the Pa signal sent from the same subscriber (Pa) 33A1 via the same path 5H and monitoring of the line monitoring information is started. When the Pa signal port 33CI starts receiving the first Pa signal, it stops sending out the dial tone and displays the required digit P.
After receiving all the a signals, it requests the control processor 34 via the control path 38 to translate the dialed digits.

Control processor 34 translates the dialed digits and notifies Pa signal port 3301 of the result. If the Pa signal path 3301 determines that continuous reception of the Pa signal is unnecessary based on the translation result, the control signal path 3B
from the outgoing subscriber line port via the control processor 34)
Transfer the translation result to 33A1.

(3) Incoming call operation within the eye office The originating subscriber line port 33A1 requests the control processor 34 to analyze the incoming call service via the control signal path 3B.

When the control processor 34 determines that the call is to a subscriber within its own office as a result of service analysis, the analog subscriber line port 33A1 corresponding to the called subscriber telephone 52, that is, the called subscriber line port 33A1, receives the called number. investigate and notify the results to 33Al (1 originating subscriber line port).

Next, the originating subscriber line port 33Al connects the control signal path 36
and sends the activation request to the incoming subscriber line port 33A1 via the control processor 34. Therefore, the terminating subscriber line port 33A1 checks whether the terminating telephone 52 is available in response to this activation request. If it is vacant, the bearer channel 5C is captured, a paging signal transmission control order is given to the subscriber circuit of the incoming subscriber line port 33A1, and the incoming telephone set 5
2. along with the outgoing subscriber line baud via control signal path 3B and control processor 34) 33A.
Notify 1 of activation confirmation.

Originating subscriber line port 33A1 then sends a callback tone transmission request to Pa signal port 33CI via control signal path 3B and control processor 34. The Pa signal port 33C1 then sends a callback tone or ringing tone to the originating subscriber line 33A1 via one communication path 5H.

(4) Internal tangential line operation When the incoming telephone 52 answers, R subscriber line baud) 3
3A1 detects this and sends a ring stop order to its subscriber circuit. Along with this, the outgoing subscriber line baud via control signal path 3B and control processor 34)
3A1 is notified of the called subscriber's response.

In response to this response notification, the originating subscriber line baud) 33A1 disconnects the communication path 5H to the control processor 34 through the control signal path 3B and disconnects the Pa signal port 33C.
Request the release of 1. The control processor 34 then issues an order to the bearer switch 32 to disconnect the communication path 5H and issues a resource release request via the control signal path 3B. The Pa signal port 33C1 then releases the resource and the bearer channel 5B.

Next, the originating subscriber line port 33A1 issues a call start order to the originating subscriber circuit and requests the control processor 34 to set up the communication path 5. The control processor 34 gives a connection instruction to the bearer switch 32, thereby establishing a communication path between the originating telephone 51 and the terminating telephone 52 in the bearer switch 32, and starting a mutual conversation.

(5) Disconnection Operation When the originating telephone 51 requests disconnection of the call, the 1 originating subscriber line port 33^1 requests the control processor 34 to restore the communication path 5■ via the control signal path 3B. The control processor 34 sends a restoration order to the bearer switch 32 to restore the communication path 5I.

Next, the originating subscriber line baud) 33A1 makes the subscriber circuit of the originating telephone 51 vacant, and transmits the bearer channel 5A.
to release. At the same time, it instructs the incoming subscriber line port 33A1 to release via the control signal path 38 and the control processor 34. This allows incoming subscriber line port 33
A1 also releases its bearer channel 5C and monitors the recovery of the incoming phone 652. Once restored, the subscriber circuit is returned to its idle state.

The above is an example of the operation of local connection in this embodiment.
Outgoing connection operations to other stations are performed in the same manner. More specifically, for outgoing connections, analog subscriber line ports 33A1. P
R signal port 3301, analog trunk line baud) 338
1 and liver signal port 33Q2 are activated.

i'
are connected by communication paths 5H15J and 5L. Also for incoming connections, analog trunk line port) 33B1% correction signal port 33C2 and analog subscriber board port) 33Al
is operated, and the control processor 34 controls the bearer switch 32 to connect each bearer channel 5G, 5F and 5C to the communication path needle 5, so that the control processor 34 controls the bearer switch 32 to connect each bearer channel 5G, 5F and 5C to the communication path needle 5, thereby performing a similar process and referring to FIG. In an embodiment in which the method is applied to a packet switching system, the bearer switch 32
packet subscriber line port) 33A2. packet trunk line port) 33B2, X25 signal port 33C3 and X? 5 signal port 33C4 is accommodated. In this embodiment, the packet subscriber line port 33A2 is CCIT?
Recommendation x, subscriber line 39A2 with 25 interfaces
It has a built-in packet line interface circuit that has the following functions: current supply, overvoltage protection, bit synchronization, frame synchronization based on high-speed data link control procedure (HDLC), error control and sequence control, and retransmission control. ing.

The port 33A2 controls and manages this subscriber circuit through stored program control or firmware control, and provides a function for transmitting and receiving layer 3 packet information specified in Recommendation X25 to the bearer channel on the universal port interface 31. have

Similarly, the packet trunk line port 33B2 has a CGIT recommendation x, 75 interface.
It has a built-in packet line interface circuit that has the following functions: current supply for this line, overvoltage protection, bit synchronization and frame synchronization based on HDLC procedures, error control and sequence control, and retransmission control. The port 33A2 controls and manages this interface circuit through storage program control or firmware control, and has the function of transmitting and receiving layer 3 packet information specified in Recommendation x575 to the bearer channel on the universal port interface 31. .

X25 signal baud) 3303 is the X2 signal baud located in the bearer channel on the universal port interface 31.
Send and receive information in 5-packet format and support logical channels with virtual times 1! It controls and manages l connections (VC) and fixed virtual connections bA (pvc), and communicates communication data requested to be transferred in data packet format to bearer channels captured in correspondence with logical channels on the above-mentioned universal port. It is a packet signal port that has Layer 3I capability in packet switching by arranging data.

X75 signal port 33C4 is a similar packet signal port and has layer 3 functionality for X75 packets. These functions are again achieved through stored program control or firmware control.

These ports 33A2 to 33c4 are accommodated in the bearer switch 32 by the universal port interface 31. universal port interface 3
On X?1, packets in ×25 packet format are transferred by bearer channels OA, 8B, 8F and 6G, and 5 packet format packets are on bearer channel 8I.
and forwarded by 8J. Communication data is also transferred by bearer channels 8G, 8D, 8E and 8H on the universal port interface 31. The bearer switch 32 includes bearer channels 8A-8 under the control of the control processor 34 depending on the signaling process of the call.
~BO is set in the communication path 6 that connects J to each other.

In this embodiment, an intra-station tangential operation between subscriber units having an X25 interface will be explained as an example.

(1) Data link establishment packet subscriber line baud) When the data link establishment request frame is received from the packet terminal connected to it through the packet subscriber line 39A2, the data link establishment request frame is detected and the bearer channel 8A is captured.

packet subscriber line port (originating subscriber line port)
Control processor 3 via control signal path 3B of 33A2
(X25 signal port to 4) Request selection of 33C3.

The originating subscriber line port 33A2 selects one of the multiple X25 signal bauds 33C3 accommodated in the bearer switch 32 and instructs resource acquisition via the control signal path 3B. Captured X25 signal port or originating X25
The signal port 33C3 checks the availability of resources,
If there is space, the bearer channel 6B is captured. Control processor 34 reports its results to originating subscriber line port 33A2 via control signal path 3B.

Therefore, the originating subscriber line port 33A2 is connected to the control signal path 3.
6, the control processor 34 is requested to set the communication path 8 for layer 3 information transfer. In response, the control processor 34 sends a connection order to the communication path 6 to the bearer switch 32, and transfers the activation request to the originating X25 signal port 33C3 via the control signal path 3B.

(2) Calling operation When the calling terminal makes a call, an X25 format call control packet arrives at the subscriber line port 33A2 via the data link.

The same port 33A2 is not involved in the contents of the packet, and
The originating X25 signal port 3303, which transfers the X25 signal port on the originating side to the X25 signal port 33C3 in the X25 packet format via the communication channel BK, checks the CR packet, which is the first packet of the call, and sends it to the control processor via the control signal path 3B. 34 to analyze the originating service and translate the destination address.

The control processor 34 checks whether the call is possible, translates the destination address, and notifies the originating X25 signal port 33C3 of the result via the control signal path 38.

(3) Incoming call operation The originating side X25 signal port 33C3 is connected to the control processor 34
If the analysis result indicates that the call is incoming within the local station, the control processor 34 is requested to analyze the incoming call service via the control signal path 3B. The control processor 34 investigates the number of the packet subscriber line port accommodating the terminating subscriber terminal, ie, the terminating subscriber line port 33A2, from the terminating address, and notifies the originating side X25 signal baud 33C3 of the result.

The originating X25 signal port 3303 then captures the bearer channel 6D and then sets the correspondence between the originating logical channel and the bearer channel in its memory. Thereafter, the activation request is sent via control signal path 38 and control processor 34 to terminating subscriber line port 33A2.

Therefore, in response to this activation request, the terminating subscriber line port 33A2 captures the bearer channel 6G if the data link with the 1 terminating terminal is not established, and sends the signal to the control processor 34 via the control signal path 3B. to request selection of the X25 signal port.

The control processor 34 selects one of the plurality of X25 signal ports (33C3) accommodated in the bearer switch 32 and instructs resource acquisition via the control signal path 3B.

The captured X25 signaling port, ie, the destination X25 signaling port 33C3, captures free resources and captures the bearer channel 8F. This allows the incoming subscriber line baud via control signal path 3B and control processor 34) 33
Report the results to A2.

Next, the incoming subscriber line port 33A2 requests the control processor 34 to connect the communication path 6M for layer 3 information transfer via the control signal channel 36. Control processor 34 provides connection instructions to bearer switch 32.

The terminating subscriber line port 33A2 establishes a data link with the terminating terminal, and then passes the control signal path 3B to the terminating side! 25 signal port 33C3.

The terminating side x25@ port 33C3 selects the bearer channel 6E and the logical channel of the terminating line, and then stores the correspondence between the logical channel and the bearer channel BH on its memory. Along with this, the destination side X25 signal port 33C
3 is 1 communication path 8M and incoming subscriber line port) 33A
2, a 0M packet indicating an incoming call is sent to the called terminal.

After the above, the destination side X25 signal port) 33C3 transmits the originating side
25 signal port) Notify activation confirmation to 3303.

Next, the X25 signal port 33C3 requests the control processor 34 to connect the communication path 8L via the control signal path 3B, and the control processor 34 sends a connection order for the communication path 8L to the bearer switch 32.

(0 response operation When the called terminal responds, a GA packet is sent.

The terminating X25 signal port 3303 receives the terminating X25 signal port 3303 from the terminating subscriber line port 33A2 via the communication path 8N. Based on the correspondence with the bearer channel number, the originating side x 25 signal port is sent via the control signal path 3B and the control processor 34.
Notify C3 of the response of the called terminal.

At the originating X25 signal port 3303, based on the correspondence between the bearer channel 8D number stored in memory and the logical channel number of the originating line, the communication path 6 is routed to the originating subscriber line baud) 33A2. and then press C on the calling terminal.
Send C bucket. This enables communication between the calling and receiving terminals.

(5) Communication operation Data sent from the originating subscriber terminal to the terminating subscriber terminal is transmitted from the originating subscriber line port 33A2 to the communication path 8.
0 originating X25 signal port 33C3 received as a DT packet to originating X25 signal port 3303 via K
is based on the correspondence between the logical channel number of the originating line and the number of bearer channel 8D stored in the memory,
Calling side X25 signal port via communication path 6L) 33C
3, only transfer data other than the packet header is transferred.

terminating side
Data is transferred from the terminating subscriber terminal to the originating subscriber terminal by converting it into a DT packet format and transmitting the DT packet via the communication path 6M and the terminating subscriber line port 33A2.

(8) Disconnection operation When the originating terminal performs a disconnection operation, the originating subscriber line baud)
33A2 and communication path 8K to the originating side X25 signal port) 33C3 is the originating side X2 which receives the CQ packet.
5 signal baud) 3303 is transmitted to the destination X25 via the control signal path 3B and the control processor 34 based on the correspondence between the logical channel number of the originating line and the number of the bearer channel 80 stored in the memory. signal baud) 330
3, sends a release request.

The destination X25 signal port 33C3 uses the communication path 6N and the destination subscriber line port 33A2 based on the correspondence between the bearer channel BH number stored in the memory and the logical channel number of the previous line. and sends a CI packet to the destination terminal.

Recovery from the terminating terminal is via the terminating subscriber line port 33A2 and communication path 6M to the terminating side X25 signal port 33.
The destination X25 signal port 3303, which is performed by receiving the CF packet
Based on the correspondence with the number E.

The release confirmation is notified to the originating X25 signal port 53303 via the control signal path 3B and the control processor 34.

The logical channel and bearer channel are released and the corresponding stored information on the memory is also erased.

Therefore, the originating X25 signal port 33C3 requests the control processor 34 to restore the communication path 8N via the control signal path 3B. The control processor 34 sends the 0-side X 25 which gives a restoration order to the communication path 8L of the Vera switch 32.
Based on the correspondence between the bearer channel 8D number and the logical channel number stored in the memory, the signal port 3303 sends the signal to the communication path 8 and the outgoing subscriber line baud).
Sends the CF packet to the originating terminal via 33A2,
The logical channel and Vera channel 8D are released, the corresponding memory contents are also erased, and the layer 3 procedure is completed.

As described above, an example of the operation of inter-station interpolation in packet switching has been described, but outgoing connections to other stations and incoming connections from other stations can be realized in the same way. i.e., packet subscriber line baud) 33A2, X25 signal port) 33C3, packet trunk line baud) 33B2 and X75 signal port)
33C4 and the control processor 34 connects each bearer channel 8A, 88.8C, 1liH16 and 8'' to a communication path 8 on the bearer switch 32.
This is done by connecting ON and BO.

Referring to FIG. 6, in an embodiment in which the method according to the present invention is applied to an integrated switching system, the bearer switch 32 has analog subscriber line baud) 33A1, packet subscriber line baud) 33A2 . I interface subscriber line port 33
A3. An X25 signal port 33C3 and an I interface signal port 33C5 are accommodated.

■Interface subscriber line port) 33A3 accommodates an I interface subscriber m39A3 having an integrated subscriber line interface to which an integrated terminal 71 including a single line switching terminal and a packet switching terminal is connected, and provides current supply, monitoring, Bit synchronization, frame synchronization, 2-wire/4-wire conversion,
Test 1 It incorporates an I-interface subscriber circuit that has the following functions: separation of communication B channel and signal D channel, HDLC-based D channel frame synchronization, error control and sequence control, and retransmission control. In this embodiment, the port 33A2 controls and manages this subscriber circuit by storage program control or firmware control, and controls and manages the subscriber circuit on the D channel! It has a function of placing packet information in the X.25 format on separate bearer channels on the universal port interface 31 and transmitting and receiving it.

■Interface signal port) 3305 is layer 3 on the D channel specified in CCI Mushroom Recommendation 1.451.
A signal port that transmits and receives signal information and controls circuit switching operations of the B channel. These functions are again achieved through stored program control or firmware control.

These ports 33A1 to 33C5 are accommodated in the bearer switch 32 via the universal port interface 31. universal port interface 3
In this example, f34Kb/s line-switched B
Channel communication information is transferred by bearer channels 7A and 7E, and I451 format signals are sent and received by bearer channels 7C and 7D. Also, X25 packet format packets are on bearer channels 7B, 7F, ?
1 communication data transferred by
Transferred by G and 7H.

to the bearer switch 32, depending on the signaling process of the call.

Under the control of the control processor 34, the bearer channels 7A~
~7P is set in the communication path 7 that connects the 7'' to each other.

The circuit switching connection operation in the integrated switching system of this embodiment will be explained as an example.

(1) Data link establishment originating terminal 71 on D channel
When a signal D channel data link establishment frame is sent from 1, the interface subscriber line port, that is, the originating subscriber line port 33A3 detects this and captures the bearer channel 7c.

to the control processor 34 via the control signal path 36! Requests selection of interface signal port 3305.

(outgoing subscriber line port) 33A3 is a plurality of I interface signal ports 33 accommodated in the bearer switch 32
C5 and directs resource acquisition via control signal path 36. Captured I interface signal port (or originating signal baud) 33C5 checks resource availability and captures bearer channel 7D if available. Control processor 34 reports its results to originating subscriber line port 33A3 via control signal path 38.

Therefore, the originating subscriber line port 33A3 requests the control processor 34 to set up the communication path 7 for layer 3 signal frame transfer via the control signal path 3B. In response, the control processor 34 sends a connection order to the communication path 7 to the bearer switch 32, and
The activation request is transferred to the 1 interface signal port 33G5 via B.

(2) Calling operation When the calling terminal 71 makes a call, a layer 3 call control message arrives at the subscriber line port 33A3 via the D channel.

33A3 is not concerned with the contents of the message, and forwards the interface signal to 33C5 via communication channel 7K in Layer 3 format. (2) The interface signal port 33C5 checks the 5ETUP message, which is the first message of the call, and requests the control processor 34 to analyze the originating service and translate the destination address via the control signal path 3B.

The @control processor 34 checks whether the call is possible or not, translates this destination address, and sends the result via the control signal path 3B to the interface signal port 33C.
Notify 5. The I interface signal port 33C5 notifies the originating subscriber line port 33A3 of the result via the control signal path 3B and the control processor 34, and also sends the result to the originating subscriber terminal 5 via one communication path 7K.
ETIIP AC) Sends a C message.

(3) Termination Operation Originating Subscriber Line Port 33A3 causes control processor 34 to perform termination service analysis via control signal path 38. If the analysis results indicate an incoming call to the local subscriber, e.g., the terminal 72 accommodated in the analog subscriber line port 33A1, the control processor 34 transmits the call to the analog subscriber line port, i.e., the terminating subscriber line port 33A1. 33A3, the originating subscriber's line.

Next, the originating subscriber line port) 33A3 is the control signal path 3
6 and the control processor 34 to the incoming subscriber line port 33A1.

From then on, the incoming subscriber is called in the same way as the incoming call and connection operations in the circuit switching system described above. 33C5 is connected to the communication path 7 and the outgoing subscriber line is connected to the outgoing subscriber via 33A3. It sends an ALERT message to the subscriber terminal 71 when confirming the incoming call, and a GOWN message when responding to the called subscriber.

After the terminating subscriber responds, communication within the own station becomes possible via the communication path 7L connected between the originating subscriber line port 33A3 and the terminating subscriber line port 33A1.

Further, the packet switching connection operation in the integrated switching system shown in FIG. 6 proceeds as follows.

First, when a D channel data link establishment frame for packet communication is sent from the first originating terminal 71, the interface subscriber line port, that is, the originating subscriber line port 33A3 detects this, captures the bearer channel 7B, and establishes the control signal path. 3B to control processor 34 to request selection of 33C3 (X25 signal port). This establishes a data link on the D channel. The subsequent connection operation proceeds in the same manner as the operation example in the packet switching system described above.

FIG. 7 shows an embodiment in which a conference call service is provided by a line switching system to which the method according to the present invention is applied. In this embodiment, the bearer switch 32 has an analog subscriber line port 33A1. A PB signal port 33C1 and a conference service port 33 old are accommodated.

In this embodiment, the conference service circuit 3301 has a built-in conference service circuit that has a function of synthesizing the voice of the champion placed on the three bearer channels on the universal port interface 31, and is controlled by the storage program or firmware. It has the function of controlling and managing this conference service circuit.

These bauds) 33A1 to 3301 are connected to the bearer switch 32 by the universal port interface 31.
is housed in. Voice, subscriber monitoring and control information is transferred by bearer channels 8A-8G thereon. Depending on the signaling process of the call, the bearer switch 32 includes:
Under the control of the control processor 34, the bearer channels 8A~
Communication paths 8H to 8K are set to interconnect 8G.

In this embodiment, an example of connection operation of a conference call service will be explained.

The calling operation and the PH dial receiving operation are similar to the calling operation detection in the circuit switching system described above for the embodiment of FIG.

The conference service connection operation proceeds as follows.

For example, the analog subscriber line port 33A1, to which the originating telephone fi81 is connected, is the originating subscriber line port 3.
3Al connects control processor 2 and 3 via control signal path 3B.
4 to analyze the incoming call service. Control processor 34 determines that the analysis indicates a conference call request;
The originating subscriber line port 33A1 is notified to that effect. The originating subscriber line port 33A1 then requests the control processor 34 via the control path 36 to select the conference service port 33D1.

The control processor 34 selects one of the plurality of conference service ports (3301) accommodated in the bearer switch 32 and instructs resource acquisition via the control signal path 36.

The captured conference service port 33 checks the availability of conference call resources, and if there is availability, captures bearer channels 8G, 8D, and 8E. Control processor 34 connects originating subscriber line port 3 via control signal path 3B.
Report the results to 3A1.

The originating subscriber line baud) 33A1 then sends the communication path 8H restoration 1 to the control processor 34 via the control signal path 3B.
Communication path 8! connection, request for release of PB signal port 33CI, and conference service port) 17) Wake up to 3301!
Submit a request. The control processor 34 has one communication path 8H.
The communication path 8I is restored and the communication path 8I is connected, and the PB signal port 33C1 is requested to release resources via the control signal path 3B. 82 and 83
Send the port number and its activation request. PB signal port 33CI releases signaling resources and Vera channel 8B.

The conference service port 33[11 then sends a ringback tone to the originating subscriber telephone a81 via the bearer channel 8C and then to the control signal path 3B and the control processor 3.
4, a request to activate the second communication partner telephone 82 and the third communication partner telephone 983 is sent.

Thereafter, the second and third party telephones 82 and 82 are called by operations similar to the incoming call operation and connection operation described above for the circuit switching system shown in FIG.
When the other party's telephone 82 answers, the conference service port 33
01 stops sending the callback tone and calls the originating subscriber phone a81.
Enables communication with. When the third communication partner telephone terminal Ia 83 responds, the conference service port 33[+1 enters the champion call.

In these embodiments of the present invention, line/service oriented functions such as control and management of subscriber lines, trunk lines, subscriber line signals, trunk line signals, and services, which were traditionally handled by a control processor, are performed. The ports 33A to 33D distributed and accommodated in the bearer switch 32 are configured to share the load. Therefore, the configuration of the software that implements each of these functions is simplified and reduced in size.

Further, each of the ports 33A to 330 has a configuration in which hardware control and software control and management are integrated. This determines the line type.

Addition of signaling system and service functions can be easily accommodated by adding and accommodating port types. Furthermore, it is possible to appropriately respond to conditions such as line types, signaling systems, and services that are not standard or unique to a particular user.

Furthermore, a control processor 34 and a decentralized port 33
Control signals between A and 330 are also carried out via the bus 3B between bearer channels connected on the bearer switch 32. Therefore, not only the configuration of the control system is simplified, but also the processing capacity of the switching system is no longer limited by the communication capacity of the inter-processor communication bus or communication link, as was the case in the past. Therefore, a large capacity switching system can be realized.

(Effects of the Invention) As described above, in the present invention, the line/service oriented functions, which were conventionally handled by a control processor, are shared by the distributed accommodation ports of the digital multiplex switch. Therefore, the configuration of those software becomes simple. Furthermore, each port is controlled and managed by hardware and software in an integrated manner, and therefore functions can be added by accommodating additional ports. In other words, it is possible to easily respond to changes in service conditions and/or increases in station size.

Further, control signals between the control processor and the distributed port are also transmitted via the inter-bearer channel path 3B set on the bearer switch. Therefore, the configuration of the control system is simplified, and the processing capacity of the exchange system is not limited by the communication capacity of the interprocessor communication bus or communication link.

Therefore, a high-capacity switching system is realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a basic embodiment of an automatic switching system using a distributed port control method according to the present invention, and FIG. 2 shows an example of the configuration of bearer multiple channels on a universal port interface in the embodiment shown in FIG. FIG. 3 is a block diagram showing an embodiment in which the method according to the present invention is applied to a circuit switching system. FIG. 4 is an explanatory diagram showing symbols of a universal port interface and a bearer channel used in the figures from FIG. 3 onwards. FIG. 5 is a block diagram similar to FIG. 3, showing an embodiment in which the method according to the present invention is applied to a packet switching system. FIG. 6 is a block diagram similar to FIG. 3, showing an embodiment in which the method according to the present invention is applied to an integrated switching system. FIG. 7 is a block diagram similar to FIG. 3, showing an embodiment in which a conference call service is provided by a circuit switching system to which the method according to the present invention is applied. Fig. 8 is a relay system diagram schematically showing a configuration example of a circuit switching system using conventional distributed control, Fig. 9 is a block diagram schematically showing a configuration example of a packet switching system using conventional distributed control, and Fig. 1O. is an explanatory diagram showing an example of the division of functions of each component device in the conventional circuit switching system shown in FIG. 8, and FIG. FIG. 12 is an explanatory diagram illustrating an example of division of functions among various ports, bearer switches, and control processors in the method according to the present invention in comparison with that of a circuit switching system using conventional distributed control. It is. Main ' code Yukimei 31, Universal port interface 32, Bearer switch 33A to 33D, Port 34, Control processor 3B, Control signal bus 37, Communication bus patent Applicant Oki Electric Industry Co., Ltd. Representative Takao Maruyama Structure measurement of distributed port control switching system Figure 3 Figure 4 Application example to packet switching system Application example to service control PPU: Packet processing Processor LLJ: @Tracking unit 5LCT: Communication link control unit Conventional packet switching system configuration Figure 9 Functional division in conventional line switching system Figure 10 Port functions, control units, structural units Conventional one-pack switching system
Distributed port control method according to the present invention Conventional method and functional division of the present invention

Claims (1)

[Scope of Claims] 1. A plurality of digital multiplex communication paths having a digital multichannel configuration in which channels in which digitized communication information is arranged are multiplexed, and in response to a connection instruction, a plurality of digital multiplex communication paths are accommodated. A digital multiplex exchange switch means for performing exchange between channels; and a port means connected to the digital multiplex communication path from the digital multiplex exchange means and autonomously controls and manages line and service-oriented functions among switching functions. and a control means connected to the digital multiplex exchange switch means for giving the connection instruction to the exchange switch means to control path connections between channels on the digital multiplex communication path in the exchange switch means; and transfer path means for transferring a control signal between the digital multiplex switching means and the digital multiplex switching means, the digital multiplex switching means using at least one channel on the digital multiplex communication path. A control signal path for transferring control signals between the transfer path means and the port means is semi-fixed, and the port means uses the control signal path to transfer the control signals to and from the control means. An automatic switching system of a distributed control type, characterized in that the digital multiplex exchange switch means, the port means, the control means, and the transfer path means jointly operate to perform mutual exchange between channels on the digital multiplex communication path. . 2. In the automatic switching machine according to claim 1,
The line/service oriented functions include at least one of subscriber lines, trunk lines, signals, and services among switching functions.
An automatic switching machine characterized by including two functions.