JPS5816798B2 - Distribution control device for digital switching system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] A uniformly fabricable solid-state module distribution controller for use in a digitally switched branch or central office serving an increasing number of subscribers is described. communicates to the group switch via standard hardware interfaces.

The system is distributed according to line-by-line service class and is not limited to a storage program control system;
Moreover, it provides an individual microprocessor for each call control device with software that can be expanded without adversely affecting existing software.

The switching control signals are conveyed through the same path that couples the call signals between the subscriber subsets and the group switch, thereby eliminating a cumbersome and expensive separate control path.

In accordance with another aspect of the invention, a subscriber's calls are divided into an outgoing call half and an incoming call half under the control of the subscriber and separated by a group switch, thereby eliminating undesirable interactions between them. Be prepared for simplified software requirements.

The present invention relates generally to the field of digitally switched multi-subscriber communication systems, and more particularly to systems implemented on a one-microprocessor-per-line or per-Erlang or security-block basis. , concerning a distributed control device centered around a digital switching matrix.

A telephone central office or branch office implementing the above distribution control apparatus and method is described.

In modern telephone switching systems, a large amount of data indicating line and trunk conditions is accumulated that is processed by the switching system along with actions requested by the switching equipment in response to various line and trunk condition conditions. It is now necessary to

Typical data includes subscriber service class, trunk call class, subscriber limitations, age of telephone subscription number to machine number, translation of machine number to telephone subscription number, translation of number code to switch operation. conversion, i.e., converting area and station codes by alternating routes.

In prior art centralized control schemes, this data is available in a common storage, which is duplicated for reliability and accessed by a common control computer to sequentially manipulate the extracted data. It is now possible to do so.

In this prior art multiprocessing common control system, two or more processing units must simultaneously access a common storage device to obtain data.

There are various interference problems with such schemes that result in effective throughput losses that increase as the number of computers increases.

Distributed control schemes incorporating distributed control functions have been developed in the prior art.

A prior switching system in which storage program controllers are distributed throughout the system is disclosed in U.S. Pat. No. 39,743.
It is explained by No. 43.

Another conventional switching system is a progressive control switching system that utilizes register control, rather than the outgoing caller and the incoming caller as described by the present invention.
U.S. Patent No. 38607 for combining entire calls at once
No. 61.

Traditional systems have focused on increasing the efficiency of processing functions.

Multiprocessing was introduced to increase processing power, but the objective remained the same: not to provide more power than necessary.

This has contributed to undesirable interactions between software packages where changing or adding one feature interferes with the current functioning of other features in a completely unpredictable manner.

Conversely, it envisions thorough testing (also known as regression testing) of software packages whenever features or traffic-sensitive quantities are changed.

The larger the software package, the more testing it must do and the constant retesting of old features to make sure they still work.

The main reason why this problem occurs in the conventional technology is that the storage program control processing function is time-divided between a large number of tasks that occur in response to traffic requests that are randomly sent and received. In the control system configuration.

Such a configuration also allows for software errors or temporary hardware errors that cause the computer's program to "jump" to undesirable or unpredictable storage locations, thus impairing the correct operation of the entire software package. disrupt.

In accordance with the present invention, this cycle of regression testing is eliminated by providing a system configuration that allows processing functions to be assigned to each call for the duration of the call.

According to the invention, each call in progress has its own dedicated computing device, a microprocessor, that handles the call independently of other calls being processed at the same time.

Thus, an arrangement is achieved in which a dedicated processing unit is provided for each call.

This method of having a dedicated processor for each call allows the software package to be interrupted to handle other calls.

It can be designed so that it does not occur.

The present invention goes beyond allocating one processing unit function for each active call in progress and uses the principle to provide each terminal (line or trunk) with dedicated processing capacity at the central office.

It's expanding.

The processing functionality may be located far away from the central office, at a remote concentration point or even in a telephone set.

Additionally, the expense traffic as well as for call signals created by the requirement for individual processing functions to communicate with each other and from time to time with some centralized functions such as centrally stored data, maintenance modules, human-machine interfaces, etc. A central communications exchange path is also provided for use.

When a plethora of processing functions work independently but interact with each other in a completely asynchronous manner, this represents the distribution of control functions from a central location to each individual line and/or trunk terminal. .

Communication between processing functions occurs via hardware interfaces.

Each processing function is assigned a specific line/
It concerns only the characteristics of the trunk.

Therefore, once thoroughly tested, it will continue to work with similarly tested functions through a common interface.

Adding a new feature to the processing functionality associated with a particular line will not work correctly with another existing line that does not have that new feature (until it has been thoroughly tested); Since it is never affected by the connection of calls between existing lines, it cannot prevent two such existing lines from interacting with each other.

There are sufficient hardware safeguards at the communication interfaces to detect erroneous transmissions between processing packages and to alert maintenance personnel to erroneous transmissions.

Furthermore, one processing function may not be able to change the operating instructions for any other processing function.

In the present invention, all a processing function can do is provide data via a hardware interface from which a remote processing function can choose to operate according to its own set of storage instructions.

One such hardware communication interface was developed by K. Geisken and J.K.

Ge1sken-J, Cotton) and assigned to the same assignee as the present application, U.S. Patent Application No. 766396 (also filed in Japan on February 7, 1978, Japanese Patent Application No. 12016-1971, JP Showa 53-12140
This is a ``switching network that can be continuously expanded'' described in the publication (see Publication No. 9).

By using a processing unit in each terminal, functions that required hardware/logic equipment, electrical equipment, and audio equipment in the prior art can be performed under software control by the processing unit.

In the present invention, these functions include line calling,
Tone detection and generation, line testing, A-to-D conversion, etc. are performed on a line/trunk by line/trunk basis to time division multiplex (TD) the transmission and exchange of information.
M) Make it possible in a format.

As is well known, current time division multiplexed (TDM) transmissions transmit analog amplitude information as digital values using, for example, delta modulation (ΔM) or sampling of the amplitude information at periodically consecutive time points. This is done by pulse code modulation (PCM), which is expressed in binary terms.

Such binary words are transferred as data bytes in periodically successive time slots which, when assigned to a communication link, form a time channel.

Switching time slots between channels by a time switch using time slot exchange is known and is described in detail, for example, in US Pat. No. 3,770,895.

U.S. Patent Application No. 773713 by R1 Treiber, which is a pending patent application assigned to the same assignee as the present invention (also filed in Japan on March 2, 1978, Japanese Patent Application No. 53-22889; Kaisho 53-134
A- in the line circuit interface or digital subset as described in Publication No. 308)
The D translation logic is controlled by microprocessor logic that is also adaptable to control the central office switch to the central office database.

Each such subset or group of subsets is controlled by a dedicated microprocessor containing programmable memory with storage update capability via a digital channel to the central office.

A common program, although a single microprocessor may be dedicated to each subscriber set.

A local distribution multiplexer using a microprocessor is used to service a group of subscribers with each microprocessor so that the RAM storage can work and be accessed by, for example, 30 to 60 subscribers.

According to the invention, the aforementioned control functions determine whether the programmed line and switching equipment control functions are located at branch offices, at the central office, or distributed to lines further down, a and at the time of the central office. Distributed to the individual 2-ins and trunks to the extent determined by the functional elements of the space exchange device.

The distributed technology of the present invention not only switches voice and data traffic (revenue traffic), but also handles various databases such as translator input, man-machine interface data, uplink and traffic collection devices, etc. It is most advantageously used in conjunction with essentially non-blocking switched networks that also switch accessing "expense traffic".

Although a number of digital electronic switching devices can be used with the present invention, a particularly suitable switching device is described in the aforementioned K. Kaisukun and J. A. Cotton patent application.

According to yet another aspect of the invention, the digital switch connects the call signal because the call path is the only valid path through which the remote subscriber can send said control data. Exchange control commands are connected through the same path.

Thus, digitized calls and digital control signals are multiplexed on a common communications path through the group switch to establish, maintain, and terminate communications between calling and called subscribers. .

According to another aspect of the invention, for example, the l line is
The technology is described as a half call consisting of a wired public phone line, and another line consisting of a business line to a PABX.

Each processing function associated with each such line is programmed to know its own class of service and line signaling interface, and to know how to communicate via the group switch to the common central interface and to another half-call station. be done.

Thus, connections between two lines can be made without having to know how to handle all possible call combinations.

In some cases, it may be necessary to pass the signal through or to transmit it in the forward and backward directions.

These signals must be connected to a standard interface in a way that is transparent to other half-call devices.

SUMMARY OF THE INVENTION The present invention comprises an apparatus and method for providing subscriber control distribution microprocessor control of individual subscriber lines served by a telephone central office or branch office, and which uses communication channels for the transmission of control data. I try to use it for

A standardized hardware interface to the digital switching matrix is provided to the distributed subscriber controller to further perform the function of isolating the outgoing call halves and the incoming call halves to prevent interaction between them.

multiple subscriber lines corresponding to security block levels share a common storage and are connected to the switching matrix class via multiple lines of terminals to transmit data in both directions between the subscriber lines; Simultaneously and via multiple lines of the same terminal, data is transmitted between the subscriber lines from a memory dedicated to the microprocessor of the individual subscriber line controllers to effect distributed control over the communication channel.

The digital switching matrix also uses simple software to receive, switch, and transmit half of the outgoing calls and half of the incoming calls between subscribers interconnected by the aforementioned networks.

Accordingly, a primary object of the present invention is to provide a scalable branch or central office distributed control switching system in which subscriber lines and trunks communicate through standardized hardware interfaces or group switches.

Another object of the present invention is that each distribution control device
It is an object of the present invention to provide a distributed control circuit that can be manufactured uniformly for each subscriber line or group of subscriber lines so as to provide control to a large number of subscriber lines less than the block level.

Another object of the present invention is to provide a digital switching system that does not use duplication of switching circuits and control circuits of conventional common control devices, and that protects lines other than the line where the fault may be occurring. be.

Another object of the present invention is to provide a modular, robust, and long-life Norirad state or LSI distributed control device for a multiple subscriber switching system without the throughput limitations of a stored program type common control system. It is to be.

Another object of the invention is to provide a one-per-call microprocessor controller in a multi-subscriber system.

Another object of the invention is that adding additional subscriber lines or additional features to equipment can be easily accomplished without adversely impacting existing equipment, and that the software It is an object of the present invention to provide a distributed control device for a multi-subscriber system that is distributed, thereby providing simple software and simple hardware.

It is still another object of the present invention to provide a distribution control system for outgoing call halves and incoming call halves which are under subscriber control and separated by a switching matrix to eliminate undesirable interactions between the two. That's true.

Yet another object of the present invention is to provide a multiplex system in which all communication between the subscriber line controller and the system database is through a common group switch with no discrimination in the group switches between e.g. line-to-line calls and calls to translators. The purpose of the present invention is to provide a fault-resistant distributed control device for a subscriber system, thereby eliminating the need for expensive multiline control buses.

Other objects and advantages of the invention will become apparent from the following detailed description of the preferred embodiments and drawings.

Figure 1 schematically shows the configuration of the distributed control exchange system.
0 is shown.

A group switch matrix 102, of the type described in detail in Kay Geisken's aforementioned pending patent application, serves as the switching center for all systems.

Typically such switches are non-blocking in nature.

The group switch matrix 102, which may alternatively be configured as a concentrator or splitter or any other type of PCM switch, is capable of switching any time slot on any incoming multiplex line to any other provides space switching and time slot exchange for interconnection to any other time slot on any outgoing multiplex line.

The switch 102 has an internal path selection controller to adjust traffic in an essentially non-blocking manner using the call paths to accommodate distribution control on subscriber lines.

A diagnostic program capable of locating faults down to the level of a single replacement item, ie, PC board or module, is included distributed within the subscriber line's microprocessor-controlled IT having one security block and 91 microprocessors. ing.

Incidentally, a security block may contain from 1 to 60 lines.

This distributed diagnostic programming serves to suppress interactions between fault locations on one line and traffic on other lines.

With this technique of switching diagnostics from the central controller to the individual microprocessors, processor throughput does not need to be maximized; the distributed software can be configured to provide any level of maintenance and testing capability. can.

The multi-level group switch 102 is simply written as 1
04.1 in 106, 108 and 110 respectively,
A first tier consisting of 2 and 3 to n subgroups is shown.

The internal path selection controllers for each subgroup of the first tier of switches are shown at 112, 114, 116 and 118, respectively.

At floor 92221020M, switching subgroups 1 through n are shown at 120 and 122 with respective path selection controllers at 124 and 126.

Switching matrix 102 includes a common hardware switch provided by multiplexing group 148 of subscriber line circuitry 128.
The individual subscriber lines are connected to subscriber line circuits connected by interfaces and switched at the central office or branch offices.

Each multiplexed subgroup 148 is converted after A-to-D conversion by a microprocessor-controlled line circuit 128.
Line circuitry 128 couples traffic from individual subscriber lines and also performs DA conversion on the 2M analog lines it handles and traffic returning to trunks 132 and 134.

Line circuit 128 includes a microprocessor, such as an 8080 microprocessor, or other suitable microprocessor, and serves the subscriber line.

Elements of subscriber line circuit 128 are manufactured by Rl Treiber, assigned to the same assignee as the present invention.
), US Application No. 773,713.

Individual digital subscriber lines 130, subscriber transport system lines 136 and digital trunk groups 138 are
It is connected to a central office digital terminator 140 which is switched directly in accordance with the requirements of the group switch 102 for bumper ringing.

Required databases and translators shown at 142, storage of other digital data such as pilling information storage 144 and service circuitry 146 are connected to the group switch.

The translator at 142 transcodes the digits dialed or keyed by the subscriber like a normal translator would do, but here also 20
4 is used to help perform distribution control functions by operating on the only data communication path between the line circuit 128 and the group switch 1020 provided by the speech paths, one of which is shown in FIG.

The configuration of the translator will be explained in more detail using FIG.

In this way, the same switching network provides both data communication paths and speech paths between subscriber lines.

Because the individual line circuits 128 control the establishment of paths to the switching network, the central processing unit functionality previously required is effectively eliminated.

In FIG. 2, the subscriber line own costs achieved by the invention in comparison with prior art systems are illustrated by curves a to d.

The system allows for modular expansion to handle increasing numbers of subscriber lines, for example from 1,000 to 100,000 lines, with significant savings over known prior systems.

It uses multiple micro-line controllers with distributed controllers, rather than central multiple-line controllers with the necessary redundancy and large, expensive wiring or program logic associated with traditional controllers to prevent catastrophic failures. This is due to the savings that can be achieved with mass production techniques for making the seven source control line circuits.

Curve a is shown for an electrical step-by-step switch known in the prior art, which connects each subscriber directly through the call path using a line-finding device controlled directly by the subscriber dial. It can be controlled.

This system is scalable as the station grows, and as the system grows, the cost/line increases slowly over a wide range as the system becomes inefficient and inflexible.

Song ab is illustrative of a prior art step-by-step exchange system register/translator controller in which register senders and translators are used to add flexibility in numbering scheme and features.

The overlap in register sender and translation functions raises the per line cost curve at the low line count end.

Curve c is shown for a conventional hardwired logic common control system, such as the No. 5 crossbar switch.

Such a system not only suffers from the equipment duplication problem discussed above, but can also scale over a relatively small range, 8 times as opposed to the 1000 times or more of the present invention.

Additionally, the hardwired logic common control system prevents direct subscriber control of switching through the call path.

Curve C also represents the cost/line versus number of lines characteristic of the prior art storage program controlled electronic switching system.

As can be seen, at some maximum number of lines, there is a sharp cutoff because the expansion of the system is limited by the throughput capabilities of the processing unit.

Curve d then shows the cost/line versus number of lines characteristic of the system.

One control element, such as a microprocessor per line or group of lines, is used, and as discussed below, the system is modular, uniformly manufacturable, and provides standardized hardware interfaces as in the prior art. The system uses e.g. 10
It can be easily expanded from 00 subscribers to 100,000 subscribers at almost uniform cost.

As the switching system expands, throughput capacity is automatically added.

Adding to this a similar modular extension of the group matrix removes the upper limit of extensions normally found in common controllers and storage program common centers without any loss of flexibility of character.

This modularity also allows new features and services to be added to one module or to many modules without the need for extensive retesting of existing features, which are currently limiting in storage program common control systems. I have to.

The call control device, divided storage device, and distribution control device will be described with reference to FIGS. 3, 4, and 5.

The call controllers are provided on a per-call terminal circuit 128, including one call controller 302 per terminal, and handle control of both the originating and terminating sides of the call at different times.

The call control unit (CCU) includes a microprocessor 402 with dedicated storage 516, an interface 512 to shared program storage, an interface 518 to the power supply, and a one-byte address shared by other microprocessors and approximately 256 One of the interface ports to the switched network 102 with capacity
Includes paired interface ports 212 and 214 and digital filtering capacity.

Apparently, the CCU 302 described with respect to FIG.
Equipped with DC and 300 Hz low frequency control device, storage battery feeding and calling current function, 300-3800H
Provide audio frequency processing and call processing in z.

Audio frequency processing is performed by audio frequency processing device 500 under the control of microprocessor 402 .

Each two-wire subscriber line 132 has a high voltage interface 510 and an A-D converter 502 and a D-A converter 5.
04.

The digital output of the A/D converter 502 is digitally filtered by a processing unit 500 and converted to a bit stream, such as a sequential 14-bit linear PCM code supplemented with additional bits, to control the group switch 102 and to Performs communication between CCU and translator.

Digital filtering provides a 2-wire to 4-wire conversion to compensate for the loss characteristics of a particular subscriber line or trunk 132.

Microprocessor 402 is programmable to provide for geometric and loss/gain control equivalent to pad switching.

Additionally, the 300-3800 Hz output of the A/D converter 502 is digitally filtered to allow tone detection.

Processor 500 also generates a digital signal and connects it to D-A 504 to generate an audio signal in the 300-3800 Hz range to transmit busy tone, ring tone, etc. to the return subscriber line 132.

The dial pulse and the equivalent audio signal are sent to the microprocessor 4.
02 to determine when access to a common database and translator is needed to obtain further data.

A set of instructions belonging to a line/trunk service option for an individual line is accessible from shared storage 200 via storage port 512 and data/address bus 306.

Such access is limited to a single security block or bus and does not use switch matrix 102 to obtain this data.

As such, this refers to the distribution of software control instructions to individual lines/trunks, so that different in/trunk blocks can freely contain different combinations of software instructions, allowing different lines/trunks to Represents service class and feature bits.

Therefore, there is no need to store all software instructions in their entirety on a distributed basis, resulting in storage savings.

Also standard interface lines 212 and 214
The interaction of different combinations of software instructions with each other via the group switch 102 is prevented by the group switch 102.

This facilitates changing, adding, and deleting features.

Also, certain microprocessors only access the calling or called side of the software as dictated by the direction of call setup.

Channel clock line 506, data address bus 306 and request/grant line 308 are line 5
storage port along with master clock on 14) 51
2 to provide the aforementioned inter-module communication.

The interface ports to switching network 102 consist of output switches 520 and 522 and input switches 524 and 526.

A distributed controller is provided by distributing the call control processor so that each call can dedicate a microprocessor for its duration, allowing a single processor to be shared among several calls. removes the existing requirement for complex shared algorithms.

The distributed controller may be provided using one microprocessor per Erlang, per terminal, or per security block.

According to the invention, one microprocessor is provided per terminal or per line/trunk, which includes, for example, one microprocessor per subscriber line.

In any case, some microprocessors are dedicated to a line at least for the time that a call is placed through that line.

Figure 3 shows one security block.

Sixty possible terminal common program arrangements are shown.

Each terminal circuit 128, which interfaces the subscriber lines to the group switch as described above, provides two-wire to four-wire conversion, digitizes the incoming analog signal, and digitally filters it.

and other digital audio frequency processing and call control.

A microprocessor, including dedicated storage for call control, translation, path selection control signal generation, and various diagnostic functions, is coupled to shared storage 200 through a storage port in circuit 128.

In FIG.
00 is shared.

Each line from the terminal circuit 128, such as line 212, is multiplexed into a group of 32 channels 204, a common communication path that sequentially carries a 14-bit linear PCM at a sampling rate of 8 kHz, two of which are , the shared storage 200 and the system clock to communicate with other system modules according to timing signals from the system clock.

Each end-processor typically contains one in four bytes of private storage and has access to shared storage used by multiple microprocessors.

The shared storage device typically has an address capacity of 256 bytes.

Both the program and persistent data storage are shared, but the dedicated data storage, which also provides each microprocessor with a "bootstrap" initiation instruction, is not shared to minimize microprocessor interaction.

In any shared storage system, there are potential problems with processing unit contention for storage, the call time required to call a particular segment of shared storage, and the hardware and software complexities involved in overcoming the foregoing. It exists.

Shared storage 200 may consist of a multiport storage device as shown in FIG. 4, where each microprocessor 402 of call control unit 302 has multiple connections to other memory ports at multiple points 318. Data/Address Bus 306 and Memory Port 5
12 makes the call through its own memory port, such as port 512, with access through request/grant line 308 to which only 12 is connected.

As shown in the figure, only lines below 60 compete for shared storage.

Arbitrator circuit 316 allows shared storage to be accessed by only one microprocessor at a time, eliminating processing unit contention problems.

A data/address bus 306 where the shared storage controller 312 is bidirectional with the addressing of the shared storage 200.
The transfer of data to the memory port 512 via the memory port 512 is controlled.

Parity is generated for both data and addresses at memory port 512 and checked by controller 312.

Shared storage 200 may include semiconductor RAM chips organized into 32-bit words to provide the aforementioned 256 byte addressing capacity.

A master clock in clock distribution circuit 314 generates various synchronization timing signals required by arbitrator 316, memory ports such as port 512, controller 312, and shared storage 200.

Translator 202, terminal controller 128 (60 as shown in FIG. 3) and shared storage 200 are connected to line 2.
04, 206, 208 and 210 to interface the group switch.

A typical switch Y is its outlet)
04 and its outlet x+i is interfaced by line 208.

Another exemplary switch Y+1 has its outlet X interfaced by line 206 and its outlet X+1 interfaced by line 210.

As previously discussed, each of lines 204-210 multiplexed 32 time slots.

As can be seen, each terminal circuit 128 has 30 channels, with the terminal circuit outlets and the inlets of the group switch 102 synchronously providing the necessary parallel-to-serial and conversely series-to-parallel conversions therebetween. Two terminals with synchronized timing are connected to the multiplex.

The dedicated memory 516 of the microprocessor 402 may consist of masked programmed ROM or FROM.

Dedicated storage is also used for variable data, including classes of resident software and service data.
contains correction storage capacity on the order of bytes.

A translator 202 is shown in FIG.

Translator 202 is particularly advantageous when used in distributed controller configurations, where it operates only on the data communication path between the security block module and other subsystems of the exchange defined by call switch 102. The shortcomings of conventional translators in centralized storage program exchange systems that deal with and user 1 data changes are overcome by this system.

Translator '202 includes a storage device 550, a microprocessor 554 and its associated program storage device 55.
a control processor 552 including 6 and 3 of the 8
The three access ports include translator access ports to group switch 102 shown at 558, 560 and 562.

Transraking may be repeated as necessary to increase station traffic, reliability, and longevity.

The translator provides service information classes in various formats,
rate data, statistical information, etc., but also performs normal translation functions, i.e., translation from telephone number to equipment number (DN) by indexing a table in storage 550.
/EN), equipment number to telephone number translation (EN/DN)
), performs translations from area or station codes to trunk routes and from trunk routes to equipment numbers.

Each terminal circuit 128 has two
connected to one terminal multiplex line.

Each of the terminal multiplex lines has 32 channels and is coupled to a terminal switch outlet which in turn is coupled to an inlet of group switch 128.

As an example, a circuit with 960 terminals similar to circuit 128 is coupled to a group switch at a typical location station.

The 30 terminal circuits coupled to each terminal multiplex have a second interface connected to a second terminal multiplex, so that two terminals sharing the 30 terminal circuits The multiplex is connected to the same numbered outlets of two consecutive first floor switches.

One path of 60 terminals sharing a program storage device is 4
Each pair of switches in the first floor will be connected to four sets of four terminal multiplexes.

Therefore, each terminal circuit 128 contains two equipment numbers, and the DN/EN translator function constantly monitors the availability of each originating and terminating terminal circuit. do.

The response to the request for DN translation will include the equipment number of the free terminal and an indication as to whether the alternate equipment number is busy, free, or reserved.

If both terminals are on a call, this information is returned to the microprocessor 552, and the microprocessor controlling the originating caller selects a network path to the terminating equipment number and signals the information necessary to set up the call. Send by.

The microprocessor that controls the terminating part of the call is
To confirm that the terminal is currently talking to the DN/EN translator or other translator functions, and
Sends an acknowledgment signal to identify the device making the call.

Translator storage 550 is a CCD memory or magnetic bubble memory or other device capable of having a storage of at least 90 words, with 80 words for translation storage and IOK words for translator program backup storage. It may also consist of NoriRad state memory.

In this case, the word length is, for example, 16 depending on the data structure.
．． 24 or 32 bits.

The access ports 558-562 are electrically identical to the call terminal circuits to the switching matrix and are identifiable and selectable by equipment number in the same manner as the terminal circuits.

The distribution of access ports described above is such that failure of a switch module does not cause failure of more than one port, and failure of any switch in the first floor does not cause failure of more than half of the ports.

The instrument numbers assigned to the access ports are such that an algorithm in program storage 556 can derive any other instrument number from any given instrument number.

Functionally, each access port has a mechanism for selecting the contents of the channel specified by its equipment number from the PCM multiplex line, a mechanism for identifying microprocessor-to-microprocessor control messages within the channel, 1 one buffer register for holding one or more such messages, an output buffer, a mechanism for inserting such messages into the correct channel on the outgoing terminal multiplexes 564, 566, and 568, and a translator microprocessor 554; Includes a mechanism for outputting messages that leave the transmission path idle while generating output data.

Access ports 558, 560 and 562 are also
An input line is provided as shown.

Data is extracted from translator storage 550 in response to messages received at input ports, and reloading and modification of data in storage 550 is performed by the microprocessor according to programming in program storage 556. controlled by

Processor 554 may be the same microprocessor used in terminal circuitry 128 and is also shown at 402 as part of call controller 30201.

Translator storage 550 contains the necessary translation tables.

For example, the probability of a translation access that takes more than 4 milliseconds is less than 1 in 1000, and the average time to complete a translation access is less than 2 milliseconds.

User data changes and station data changes are accomplished by reprogramming storage 556 to provide for expansion of the number of lines or trunks serviced by a given station or additional user features.

Although the invention has been described in terms of preferred embodiments, it is intended that additional embodiments, modifications and adaptations that become apparent to those skilled in the art are within the spirit and scope of the invention as set forth in the claims. Not even.

[Brief explanation of drawings]

1 is a simplified block diagram of a distributed control switching system according to the present invention; FIG. 2 is a series of curves illustrating the economics of the present invention compared to prior art systems; FIG. 3 is a simplified block diagram of a distributed control switching system according to the present invention; Relationship with other system elements; FIG. 4 shows a shared storage arrangement according to the invention; FIG. 5 shows a call control and line terminal arrangement according to the invention; and FIG. 6 shows an arrangement of a translator subsystem according to the invention. 102...Group switch, 104,106°10
8.110,124,126...Subgroup, 112,114,116,118,120°122・
...Internal path selection control device, 128...
Subscriber line circuit (interface), 130...
... Digital subscriber line, 132 ... 2-wire analog line, 134 ... 2-wire analog trunk, 136 ... Subscriber transport system line, 140 ... ... Central station digital terminator, 142 ... Database, 144 ...
...man-machine interface, 146...
...Service DO Road, 2000. . ... Shared storage device, 202 ... Translator, 302 ... Call control unit, 306 ...
...Data/address bus line, 308...Request/grant line, 312...Controller, 314...
... Clock distribution device, 316 ... Arbitrator, 500 ... Audio frequency processing device,
502...A-D converter, 504...
D-A converter, 506... Channel clock line, 510... High voltage interface, 5
12...Memory port, 514...
Master clock, 516... Dedicated storage device,
518...Interface to the music power supply unit, 5
20, 522... Interface port output switch, 524゜526°゛°°... Interface port input switch, 550... Translator storage device, 552... Control processing device, 554
...Microprocessor 556...Program storage device, 558,560°562...
・Access, port.

Claims (1)

Claims: 1. For use in conjunction with a continuously expandable switch matrix of a multi-level group switch structure, such that the switch matrix configures communications between a plurality of individual subscriber lines. In a distributed control system for an operating communication system, each communication path handled by a switching system is provided with its own processor to minimize the likelihood and extent of errors during operation of the system. a first plurality of interfaces 128 each having a separate processor and each connected to a different subscriber line 132; and a plurality of first plurality of interfaces 128 connected to output terminals of the first plurality of interfaces 128. A plurality of output lines 204 having input terminals of
a multiplexer 148 having a multi-level group switch 102, and the first plurality of interfaces 12.
A translator 142 connected to one input terminal group of the first floor of the group switch 102 in association with the group switch 102 and a shared storage device 200 are provided.
In 02, the first level is the subgroup (1 to N
) 104, 106°ioa, iio, each having an internal path selection circuit 112, 114, 116, 118, and the final floor has a corresponding subgroup 120°12
2, each of which also has an internal path selection circuit 12.
4,126, the output terminal of the lower floor is coupled to the input terminal of the higher floor, the output line 204 is connected to the other input terminal of the first floor, and the output terminal of the lower floor is coupled to the input terminal of the higher floor; 200 is connected to said interface 128 together with a translator 202, said interface 128 and said shared storage 200 are all connected to said first floor of said group switch 1.02 via common output lines 204, 205, 206.210. A distribution control system for a communication system, characterized in that the system is connected to a communication system. 2. The interface 128 further includes a dedicated storage device 516 assigned to each of the groups of n subscriber lines.
The distribution control system according to claim 1, characterized in that said shared storage device 200 is allocated to said first plurality of subscriber lines. 3. The distribution of claim 1, wherein the translator 202 has a microprocessor 554 and a memory 556 associated therewith for performing the control on a call-by-call or line-by-line basis. control system. 4. The distribution control system of claim 1, wherein the interface 128 comprises a converter 502 for digitizing and encoding the audio signal. 5. The distribution control system according to claim 1, wherein the interface 128 includes an audio frequency processing device 500 to which the digitized audio signal is serially coupled to the common path 306. 6. The distributed control system of claim 1, wherein the interface 128 has a plurality of output terminals for coupling digitized audio signals in parallel to the common path 306. 7 a plurality of interfaces 128 and switch matrix 1 with translator 202 coupled thereto;
2. The distributed control system of claim 1, wherein the distributed control system is connected to the interface 128 and the switch matrix 102 and configured to convert between 0.02 and 0.02. 8. Separate means 520-526 for interface 128 to independently switch switch matrix 102 for each of the outgoing and incoming call halves.
7. The distribution control system according to claim 6, comprising: 9. Switch matrix 102 includes a plurality of common paths 306 coupled thereto from said plurality of interfaces 128 for switching calls between subscriber lines in accordance with digital pulse selection control signals. Distribution control system statement described in Section 1. 10 configured such that additional subscriber lines or trunks can be added to the system without disconnecting existing subscriber lines by providing an additional standardized interface 128 for the additional lines or trunks. The distribution control system according to claim 9, characterized in that: 11. The subscriber lines are analog lines or trunks, the calls are in the form of subscriber calls on those lines or trunks, each of which includes an outgoing call and an incoming call half, and the system has a common path. 306 with separate output and input terminals for respectively coupling the outgoing call half and receiving the incoming call half from the common path 306 and configured so that the outgoing and incoming call halves are individually controlled. A distribution control system according to claim 9. 12. Distribution control according to claim 9, characterized in that the subscriber line is an analog line or trunk and is provided with a converter 502 for digitizing the voice signal onto the common path 306. system. 13. The distribution control according to claim 11, wherein the translator 202 is provided with a selection device 552 that operates to provide a digital pulse selection control signal on a per line basis, per call basis, or per erlang basis. system. 12. The distribution control system according to claim 11, wherein the 14 translator 202 includes a selection device 522 that operates to provide a digital path selection control signal on a security block basis. 15 Translator 202 operates to provide a digital pulse selection control signal on an incoming call basis.
Claim 1 characterized in that it comprises 22.
Distribution control system according to item 1. 12. The distribution control system according to claim 11, further comprising access ports 558-562 for coupling both revenue traffic and overdraft trough traffic to a common path. 17 Database 1 that generates service data
12. The distribution control system of claim 11, wherein the multiplexer 148 is also operative to couple the data to the common path 306. 18 A distribution control system is located remotely from a telephone terminal or central office and is connected to it for connection to X other distribution control systems, and the distribution control performed by the system A distribution control system as claimed in claim 11 for use with a telephone terminal or central office, characterized in that the translator 202 divides the outgoing and incoming calls into half 12. The distributed control system of claim 11, further comprising a processor 552 operative to separate each subscriber call and individually control each half. 19. The distribution control system of claim 18, wherein the number of subscriber lines is at most equal to the number of subscriber lines.21. The distribution control system according to claim 19, characterized in that it is a microprocessor having a storage device 556 for accumulating related data. η is provided for each terminal. A distribution control system according to claim 18.