CA1101971A - Trunk control system - Google Patents
Trunk control systemInfo
- Publication number
- CA1101971A CA1101971A CA297,885A CA297885A CA1101971A CA 1101971 A CA1101971 A CA 1101971A CA 297885 A CA297885 A CA 297885A CA 1101971 A CA1101971 A CA 1101971A
- Authority
- CA
- Canada
- Prior art keywords
- microprocessor
- printed circuit
- trunk
- trunk circuits
- circuit board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
- H04Q3/545—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme
Abstract
TRUNK CONTROL SYSTEM
ABSTRACT OF THE DISCLOSURE
A trunk control system which permits use of substantially increased numbers of trunk circuits in a telephone switching system, at reduced cost, and with variability at will of the mix of the kinds of trunks which are provided. A group of trunk circuits are located on a printed circuit board, and are connected identically to a microprocessor mounted on the same card. The microprocessor controls the operation of each trunk circuit individually, converting it into the kind of trunk required. At the same time it is connected to the main system control processor whereby a substantially reduced back plane size is achieved over a system in which each trunk circuit is individually connected to the bus.
ABSTRACT OF THE DISCLOSURE
A trunk control system which permits use of substantially increased numbers of trunk circuits in a telephone switching system, at reduced cost, and with variability at will of the mix of the kinds of trunks which are provided. A group of trunk circuits are located on a printed circuit board, and are connected identically to a microprocessor mounted on the same card. The microprocessor controls the operation of each trunk circuit individually, converting it into the kind of trunk required. At the same time it is connected to the main system control processor whereby a substantially reduced back plane size is achieved over a system in which each trunk circuit is individually connected to the bus.
Description
~ \
11~31~9~1 01 This invention relates to a trunk circuit control system, 02 and in particular to a distributed control system which minimizes 03 the number of conductors interconnecting the trunk circuits with 04 the remainder of the telephone switching system.
05 Telephone switching systems such as PBXs utilize various 06 kinds of trunk circuits, such as outgoing trunks, incoming 07 trunks, special service trunks, etc. In addition, such trunk 08 circuits often utilize special outpulsing circuits, timing cir-09 cuits, signal modification circuits for filtering spurious line signals, control circuits, etc.
11 In a system such as an electronic PBX, typically a stored 12 program computer i5 utilized to control various functions of its 13 operation. In such a case each of the trunk circuits is 14 connected to the computer data and address bus, for instance by 8 individual conductors. In addition, each trunk circuit has 16 connected to it power supply conductors, signal carrying 17 conductors, and other intertrunk or intercircuit conductors.
18 Clearly the number of conductors to be connected to a single 19 trunk circuit is fairly large. With PBXs becoming physically smaller and smaller as the size of the individual electronic 21 components used therein are miniaturized and integrated, the 22 physical size of the interconnecting backplane becomes one of the 23 major factors limiting the the size efficiency of the apparatus.
24 In addition, it will be recognized that due to the requirement for different kinds of trunks as noted above, their 26 control and signal processing features are usually sufficiently 27 different that each kind has its own unique design. Further, 28 while the internal design of the switching system is usually 29 carefully controlled, exterior circuits which interface the B
01 trunks are subject to sometimes uncontrolled forces, such as 02 weathering, the induction of common mode signals, random noise 03 spikes, dropouts etc. Accordingly trunk circuits are often 04 specially designed and optimized to function with existing trunks 05 which are subject to the aforenoted hostile forces, and thus 06 different kinds of trunk circuits have different and special 07 designs for specialized use in such a system.
08 For the above reasons, and due to the physical design of 09 the system, usually a predetermined maximum number of trunks of a particular kind can be used in a PBX. Printed circuit boards 11 carrying certain special trunk circuits are disposed in one 12 physical location and are usually wired into the PBX system with 13 minimum expansion capability. Furthermore, due to the extensive 14 wiring required in the PBX, the total number of trunk circuits used is limited by the speed of operation of the bus for a given 16 address and data bus, and is limited by the length of the bus.
17 Furthermore, the larger the number of wires interconnecting the 18 trunk circuits, the more probability there is for crosstalk to 19 occur, as the wires must increasingly run close together.
The present irlvention, on the other hand, reduces substan-21 tially the length and size of the backplane of a PBX. The above 22 i8 achievable by utilizing a distributed control system, by which 23 an individual microprocessor with associated memory is physically 24 located on a printed circuit board with one or more of the trunk circuits. An electronic signal, stored in an 26 interchangeable memory of the microprocessor causes the 27 microprocessor to operate each of the associated trunks as a 28 particular predetermined kind of trunk.
29 The result of this is to minimize substantially the back-plane communication requirements between the main PBX control , ~
~ .
,~
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---" 1101~9~1 01 processor and each of the printed circuit boards carrying the 02 trunks, since communication is restricted to that required be-03 tween the main PBX control processor and each of the microproces-04 sors. Since the main communication bus to the trunk printed 05 circuit boards is thus physically minimized, substantial increase 06 in the number of trunk-carrying printed circuit boards which 07 might be used in the PBX is facilitated, thus allowing an 08 economical scale up to a large size PBX, for instance of up to 09 2,000 lines, in a small console, for what is believed to be first time.
11 Furthermore, since the determination of each kind of trunk 12 i8 based on stored signals or the equivalent in the microproces-13 sor memory, and since each of the trunk printed circuit boards is 14 otherwise identical physically to each of the others, it is a simple matter to change the quantities of the different kinds of 16 trunks at will, simply by changing a plug-in trunk module in the 17 printed circuit board and the signal content of the ;
18 microprocessor memory. Accordingly the PBX capability can be 19 expanded, contracted or varied according to the needs of the PBX
user with little difficulty.
21 Since all of the printed circuit boards which carry the 22 trunk circuits are identical, the cost of production thereof is 23 reduced due to the economics of scale. The telephone company 24 stocking requirements for replacement trunk circuit printed circuit boards is simplified, since only a single standard trunk 26 circuit printed circuit board need be stocked.
27 The invention is, in general, in a telephone switching 28 system which utilizes central processor operated trunk circuits, 29 a printed circuit board, a microprocessor including a memory, ,, ~
01 apparatus for connecting a plurality of trunk circuits in a 02 standard and similar manner to the microprocessor on the printed 03 circuit board, a switching system control processor for operating ;:
04 the microprocessor, and a data and an address bus interconnecting 05 the central processor and the microprocessor. This results in 06 the number of conductors connecting the printed circuit board 07 being no greater than would be required for a single trunk 08 circuit, and substantially reduces the number of conductors 09 connected to the buses over the number which would be required if a plurality of trunk circuits were all connected to the bus 11 system as in the prior art.
29 .;.
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197~
01 As was noted above, a predetermined signal stored within 02 the memory means causes the microprocessor to operate 03 interchangeable trunk circuits as predetermined types of trunks.
04 It should be noted that when referring to a signal stored within 05 the memory means, it is intended that this can include a variety 06 of storage modes, such as the use of a read-only memory (ROM), 07 which stores information by the use of blown fuse interconnection 08 patterns, by the use of permanently stored charges which are 09 alterable by the use of ultraviolet light, etc. In this respect the memory acts similarily to a plug patchboard with an 11 interconnection pattern of wires which causes the microprocessor, 12 upon accessing the memory, to utilize a particular subroutine 13 which may be standard for particular trunks connected thereto.
14 A better understanding of the invention will be obtained by reference to the single drawing, and to the description below.
16 The single drawing is a block diagram of the apparatus of the 17 invention.
18 In the preferred form of the invention, a switching system 19 such as a PBX has a multiplicity of printed circuit boards 1, each carrying a plurality of trunk circuits 2. A microprocessor 3 21 is physically located on each of the printed circuit boards.
22 Each microprocessor is connected in a similar manner to the trunk 23 circuits 2 which it is to control. A memory 4, preferably 24 interchangeable, is associated with each microprocessor. Each microprocessor is connected via a board-edge connector (not 26 shown) to a data bus 5 and to an address bus 6, which buses are 27 both connected to a control processor 7.
28 It should be noted that in the absence of microprocessor 29 3, with four trunk circuits per printed circuit board, and util-, .
B
L9~.
01 izing an 8 bit control processor, each printed circuit board 02 would have at least 32 terminals, with the accompanying complex~
03 ity of conductor junctions in the PBX interconnection backplane.
04 In the present invention, connection of each printed circuit 05 board requires only 8 terminals for address and data, a reduction 06 of 75%.
07 Further, in the aforenoted prior art system, for a given 08 number of instructions to be transmitted to and received from 09 each trunk circuit by the central processor, either an extremely fast control processor or a large bus must be utilized. In one 11 case, a high operation speed of the control processor must be 12 utilized in order to access the large number of trunks, which in-13 crea~e its vulnerability to crosstalk, while in the large bus 14 type of system, the backplane of the PBX becomes excessively com-plex and large.
16 On the other hand, in the present invention the processing 17 logic is distributed. A minimal size of bus between the control 18 processor and the distributed microprocessors need only be used.
19 Furthermore, the microprocessors need only be accessed by the system control processor at considerably less frequent intervals 21 than would be the case for each of the trunks, since the micro-22 processors themselves contain, with their memories, sufficient 23 control capability for the trunks, and do not require the con-24 stant control as do the trunks themselves. The communication link between the control processor and each of the microproces-26 sors is thereby substantially simplified, as is the physical 27 interconnection pattern of the backplane. The likelihood of ;^
28 crosstalk is thereby reduced, and the required speed of the main 29 control processor is also reduced.
Further, for a given physical size of PBX, the number of 31 trunks which can be accommodated is substantially increased since B
i~O3~7~
01 the backplane is simplified, for reasons which will be 02 explained below.
03 Special kinds of trunk circuits are used for different 04 applications, for instance to handle incoming calls, outgoing 05 calls, etc. In the present invention the connection pattern for 06 each of the trunk circuits 2 is identical to all of the others.
07 Each of the four trunks on each of the printed circuit boards is 08 connected to the corresponding microprocessor 3 in a standard and 09 identical manner.
; 10 Since each of the printed circuit boards is identical, 11 clearly the cost of the trunk circuits is substantially reduced 12 due to the economies of scale of manufacture, standard component 13 purchase requirements, standard stocking requirements for all of 14 the trunk circuit boards, etc.
The trunks are distinguished in their operation under di-16 rect control of the individual microprocessors. Each of the 17 memories 4 is intended to store data which causes the 18 microprocessor to operate each of the individual trunk circuits 19 in a predetermined fashion. For instance, certain trunk circuits plugged into a printed circuit board can be operated as incoming 21 trunk circuits, others as outgoing trunk circuits, etc. The 22 memory 4 can be a read-only memory (ROM), a nonvolotile random 23 access memory (RAM) etc. according to choice of the designer.
24 This memory acts as the equivalent of a plug patchboard, for causing the microprocessor to operate each of the trunk circuits 26 2 in a predetermined manner.
27 As a result the functions of the trunk circuits can be 28 mixed, and they need not be located at physically predefined lo-29 cations to accommodate external wiring as was necessary in the prior art. Furthermore, the numbers and mix of different kinds 31 of trunks can be changed at will, merely by changing the ROM, or 'i, LO:~L97~.
01 by changing the ROM interconnection pattern (i.e. by ultraviolet 02 erasing and reestablishing it using a different memory pattern).
03 Since the connector wiring locations at the backplane of the PBX
04 for individual printed circuit boards carrying different kinds of 05 special trunks are now always the same, in contrast to prior art, 06 the numbers and kinds of trunk circuits are expandable to the 07 maximum physical limits of the PBX cabinet. Substantially 08 increased versatility, and reduced cost of manufacture is thus 09 obtained.
In addition, since prewired but unfilled racks ready for 11 expansion to accommodate specific types of trunk circuits ~
12 are not required in the present invention, but only trunk circuit ;
13 sockets on standard and identical printed circuit boards, more 14 trunk printed circuit boards holding more trunks can be accommodated in a given space than the prior art system. In the 16 alternative, the physical size of the PBX can be reduced.
17 Furthermore, in case of the discovery of a faulty trunk 18 circuit, the control processor 7 need only transmit a signal to 19 the microprocessor associated with the faulty trunk to busy it out or otherwise mark the trunk as being unuseable. In the event 21 this causes intolerably decreased traffic handling capability of 22 the remainder of the trunks which are similar to the one which is 23 faulty, a spare trunk can be activated easily under control of 24 the microprocessor to substitute for the faulty trunk.
Substantially increased redundancy, and therefore increased 26 reliabilty of the PBX is thus achieved.
27 The embodiment shown in the drawing utilizes four trunks 28 on a printed circuit board; the invention should not be 29 considered as being limited thereto, since the number of trunks .
' i~O:197~ 1 01 on a printed circuit board is limited only by the capability of 02 the associated microprocessor and memory which are mounted 03 physically on the same printed circuit board, and by the 04 capability of the printed circuit board to physically accommodate 05 a given number of trunks.
06 A person skilled in the art of understanding this inven-07 tion may now conceive of various modifications and alternatives.
08 All are considered within the sphere and scope of this invention 09 as defined in the appended claims.
~, .-, .
11~31~9~1 01 This invention relates to a trunk circuit control system, 02 and in particular to a distributed control system which minimizes 03 the number of conductors interconnecting the trunk circuits with 04 the remainder of the telephone switching system.
05 Telephone switching systems such as PBXs utilize various 06 kinds of trunk circuits, such as outgoing trunks, incoming 07 trunks, special service trunks, etc. In addition, such trunk 08 circuits often utilize special outpulsing circuits, timing cir-09 cuits, signal modification circuits for filtering spurious line signals, control circuits, etc.
11 In a system such as an electronic PBX, typically a stored 12 program computer i5 utilized to control various functions of its 13 operation. In such a case each of the trunk circuits is 14 connected to the computer data and address bus, for instance by 8 individual conductors. In addition, each trunk circuit has 16 connected to it power supply conductors, signal carrying 17 conductors, and other intertrunk or intercircuit conductors.
18 Clearly the number of conductors to be connected to a single 19 trunk circuit is fairly large. With PBXs becoming physically smaller and smaller as the size of the individual electronic 21 components used therein are miniaturized and integrated, the 22 physical size of the interconnecting backplane becomes one of the 23 major factors limiting the the size efficiency of the apparatus.
24 In addition, it will be recognized that due to the requirement for different kinds of trunks as noted above, their 26 control and signal processing features are usually sufficiently 27 different that each kind has its own unique design. Further, 28 while the internal design of the switching system is usually 29 carefully controlled, exterior circuits which interface the B
01 trunks are subject to sometimes uncontrolled forces, such as 02 weathering, the induction of common mode signals, random noise 03 spikes, dropouts etc. Accordingly trunk circuits are often 04 specially designed and optimized to function with existing trunks 05 which are subject to the aforenoted hostile forces, and thus 06 different kinds of trunk circuits have different and special 07 designs for specialized use in such a system.
08 For the above reasons, and due to the physical design of 09 the system, usually a predetermined maximum number of trunks of a particular kind can be used in a PBX. Printed circuit boards 11 carrying certain special trunk circuits are disposed in one 12 physical location and are usually wired into the PBX system with 13 minimum expansion capability. Furthermore, due to the extensive 14 wiring required in the PBX, the total number of trunk circuits used is limited by the speed of operation of the bus for a given 16 address and data bus, and is limited by the length of the bus.
17 Furthermore, the larger the number of wires interconnecting the 18 trunk circuits, the more probability there is for crosstalk to 19 occur, as the wires must increasingly run close together.
The present irlvention, on the other hand, reduces substan-21 tially the length and size of the backplane of a PBX. The above 22 i8 achievable by utilizing a distributed control system, by which 23 an individual microprocessor with associated memory is physically 24 located on a printed circuit board with one or more of the trunk circuits. An electronic signal, stored in an 26 interchangeable memory of the microprocessor causes the 27 microprocessor to operate each of the associated trunks as a 28 particular predetermined kind of trunk.
29 The result of this is to minimize substantially the back-plane communication requirements between the main PBX control , ~
~ .
,~
~ .
---" 1101~9~1 01 processor and each of the printed circuit boards carrying the 02 trunks, since communication is restricted to that required be-03 tween the main PBX control processor and each of the microproces-04 sors. Since the main communication bus to the trunk printed 05 circuit boards is thus physically minimized, substantial increase 06 in the number of trunk-carrying printed circuit boards which 07 might be used in the PBX is facilitated, thus allowing an 08 economical scale up to a large size PBX, for instance of up to 09 2,000 lines, in a small console, for what is believed to be first time.
11 Furthermore, since the determination of each kind of trunk 12 i8 based on stored signals or the equivalent in the microproces-13 sor memory, and since each of the trunk printed circuit boards is 14 otherwise identical physically to each of the others, it is a simple matter to change the quantities of the different kinds of 16 trunks at will, simply by changing a plug-in trunk module in the 17 printed circuit board and the signal content of the ;
18 microprocessor memory. Accordingly the PBX capability can be 19 expanded, contracted or varied according to the needs of the PBX
user with little difficulty.
21 Since all of the printed circuit boards which carry the 22 trunk circuits are identical, the cost of production thereof is 23 reduced due to the economics of scale. The telephone company 24 stocking requirements for replacement trunk circuit printed circuit boards is simplified, since only a single standard trunk 26 circuit printed circuit board need be stocked.
27 The invention is, in general, in a telephone switching 28 system which utilizes central processor operated trunk circuits, 29 a printed circuit board, a microprocessor including a memory, ,, ~
01 apparatus for connecting a plurality of trunk circuits in a 02 standard and similar manner to the microprocessor on the printed 03 circuit board, a switching system control processor for operating ;:
04 the microprocessor, and a data and an address bus interconnecting 05 the central processor and the microprocessor. This results in 06 the number of conductors connecting the printed circuit board 07 being no greater than would be required for a single trunk 08 circuit, and substantially reduces the number of conductors 09 connected to the buses over the number which would be required if a plurality of trunk circuits were all connected to the bus 11 system as in the prior art.
29 .;.
- 3a -~ . ; , -: , . ;
197~
01 As was noted above, a predetermined signal stored within 02 the memory means causes the microprocessor to operate 03 interchangeable trunk circuits as predetermined types of trunks.
04 It should be noted that when referring to a signal stored within 05 the memory means, it is intended that this can include a variety 06 of storage modes, such as the use of a read-only memory (ROM), 07 which stores information by the use of blown fuse interconnection 08 patterns, by the use of permanently stored charges which are 09 alterable by the use of ultraviolet light, etc. In this respect the memory acts similarily to a plug patchboard with an 11 interconnection pattern of wires which causes the microprocessor, 12 upon accessing the memory, to utilize a particular subroutine 13 which may be standard for particular trunks connected thereto.
14 A better understanding of the invention will be obtained by reference to the single drawing, and to the description below.
16 The single drawing is a block diagram of the apparatus of the 17 invention.
18 In the preferred form of the invention, a switching system 19 such as a PBX has a multiplicity of printed circuit boards 1, each carrying a plurality of trunk circuits 2. A microprocessor 3 21 is physically located on each of the printed circuit boards.
22 Each microprocessor is connected in a similar manner to the trunk 23 circuits 2 which it is to control. A memory 4, preferably 24 interchangeable, is associated with each microprocessor. Each microprocessor is connected via a board-edge connector (not 26 shown) to a data bus 5 and to an address bus 6, which buses are 27 both connected to a control processor 7.
28 It should be noted that in the absence of microprocessor 29 3, with four trunk circuits per printed circuit board, and util-, .
B
L9~.
01 izing an 8 bit control processor, each printed circuit board 02 would have at least 32 terminals, with the accompanying complex~
03 ity of conductor junctions in the PBX interconnection backplane.
04 In the present invention, connection of each printed circuit 05 board requires only 8 terminals for address and data, a reduction 06 of 75%.
07 Further, in the aforenoted prior art system, for a given 08 number of instructions to be transmitted to and received from 09 each trunk circuit by the central processor, either an extremely fast control processor or a large bus must be utilized. In one 11 case, a high operation speed of the control processor must be 12 utilized in order to access the large number of trunks, which in-13 crea~e its vulnerability to crosstalk, while in the large bus 14 type of system, the backplane of the PBX becomes excessively com-plex and large.
16 On the other hand, in the present invention the processing 17 logic is distributed. A minimal size of bus between the control 18 processor and the distributed microprocessors need only be used.
19 Furthermore, the microprocessors need only be accessed by the system control processor at considerably less frequent intervals 21 than would be the case for each of the trunks, since the micro-22 processors themselves contain, with their memories, sufficient 23 control capability for the trunks, and do not require the con-24 stant control as do the trunks themselves. The communication link between the control processor and each of the microproces-26 sors is thereby substantially simplified, as is the physical 27 interconnection pattern of the backplane. The likelihood of ;^
28 crosstalk is thereby reduced, and the required speed of the main 29 control processor is also reduced.
Further, for a given physical size of PBX, the number of 31 trunks which can be accommodated is substantially increased since B
i~O3~7~
01 the backplane is simplified, for reasons which will be 02 explained below.
03 Special kinds of trunk circuits are used for different 04 applications, for instance to handle incoming calls, outgoing 05 calls, etc. In the present invention the connection pattern for 06 each of the trunk circuits 2 is identical to all of the others.
07 Each of the four trunks on each of the printed circuit boards is 08 connected to the corresponding microprocessor 3 in a standard and 09 identical manner.
; 10 Since each of the printed circuit boards is identical, 11 clearly the cost of the trunk circuits is substantially reduced 12 due to the economies of scale of manufacture, standard component 13 purchase requirements, standard stocking requirements for all of 14 the trunk circuit boards, etc.
The trunks are distinguished in their operation under di-16 rect control of the individual microprocessors. Each of the 17 memories 4 is intended to store data which causes the 18 microprocessor to operate each of the individual trunk circuits 19 in a predetermined fashion. For instance, certain trunk circuits plugged into a printed circuit board can be operated as incoming 21 trunk circuits, others as outgoing trunk circuits, etc. The 22 memory 4 can be a read-only memory (ROM), a nonvolotile random 23 access memory (RAM) etc. according to choice of the designer.
24 This memory acts as the equivalent of a plug patchboard, for causing the microprocessor to operate each of the trunk circuits 26 2 in a predetermined manner.
27 As a result the functions of the trunk circuits can be 28 mixed, and they need not be located at physically predefined lo-29 cations to accommodate external wiring as was necessary in the prior art. Furthermore, the numbers and mix of different kinds 31 of trunks can be changed at will, merely by changing the ROM, or 'i, LO:~L97~.
01 by changing the ROM interconnection pattern (i.e. by ultraviolet 02 erasing and reestablishing it using a different memory pattern).
03 Since the connector wiring locations at the backplane of the PBX
04 for individual printed circuit boards carrying different kinds of 05 special trunks are now always the same, in contrast to prior art, 06 the numbers and kinds of trunk circuits are expandable to the 07 maximum physical limits of the PBX cabinet. Substantially 08 increased versatility, and reduced cost of manufacture is thus 09 obtained.
In addition, since prewired but unfilled racks ready for 11 expansion to accommodate specific types of trunk circuits ~
12 are not required in the present invention, but only trunk circuit ;
13 sockets on standard and identical printed circuit boards, more 14 trunk printed circuit boards holding more trunks can be accommodated in a given space than the prior art system. In the 16 alternative, the physical size of the PBX can be reduced.
17 Furthermore, in case of the discovery of a faulty trunk 18 circuit, the control processor 7 need only transmit a signal to 19 the microprocessor associated with the faulty trunk to busy it out or otherwise mark the trunk as being unuseable. In the event 21 this causes intolerably decreased traffic handling capability of 22 the remainder of the trunks which are similar to the one which is 23 faulty, a spare trunk can be activated easily under control of 24 the microprocessor to substitute for the faulty trunk.
Substantially increased redundancy, and therefore increased 26 reliabilty of the PBX is thus achieved.
27 The embodiment shown in the drawing utilizes four trunks 28 on a printed circuit board; the invention should not be 29 considered as being limited thereto, since the number of trunks .
' i~O:197~ 1 01 on a printed circuit board is limited only by the capability of 02 the associated microprocessor and memory which are mounted 03 physically on the same printed circuit board, and by the 04 capability of the printed circuit board to physically accommodate 05 a given number of trunks.
06 A person skilled in the art of understanding this inven-07 tion may now conceive of various modifications and alternatives.
08 All are considered within the sphere and scope of this invention 09 as defined in the appended claims.
~, .-, .
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a telephone switching system which utilizes central processor operated trunk circuits, (a) a printed circuit board, (b) a microprocessor including memory means mounted on the printed circuit board, (c) means for connecting a plurality of trunk circuits in a standard and similar manner to the microprocessor on the printed circuit board, (d) switching system control processor means for operating the microprocessor, and (e) a data and an address bus interconnecting the central processor means and the microprocessor.
2. In a telephone switching system as defined in 1, means for mounting a predetermined memory means for causing said microprocessor to operate said trunk circuits as predetermined types of trunk circuits.
3. In a telephone switching system as defined in claim 1, means for mounting a plurality of individual trunk circuits on said printed circuit board, and connecting them in a standard and similar manner to the microprocessor, and means for mounting predetermined memory means for causing said microprocessor to operate said individual trunk circuits as one or more predetermined types of trunk circuits.
4. In a telephone switching system as defined in claim 1, a plurality of printed circuit boards each carrying means for mounting a plurality of trunk circuits, a microprocessor including memory means mounted on each printed circuit board and connected to each mounting means in a similar manner, and second means for mounting said memory means for causing individual ones of the trunk circuits which may be mounted on the respective circuit boards to operate as predetermined types of trunk circuits.
5. In a telephone switching system, a plurality of printed circuit boards each adapted to carry a plurality of trunk circuits, a central control for the switching system, bus means connecting the central control to each of the printed circuit boards, and a number of conductors connecting the printed circuit board to the bus means which number is no greater than would be required for a single trunk circuit.
6. In a telephone switching system as defined in claim 5, the number of conductors and the pattern of interconnection between the bus means and each of the printed circuit boards being identical.
7. In a telephone system as defined in claim 5 or 6, a microprocessor located on each of the printed circuit boards for operating each of the trunk circuits in a predetermined manner, each of the trunks on the individual ones of the the printed circuit boards being connected to its associated microprocessor in an identical manner, and means for connecting the microprocessor to the bus means.
8. For use in a telephone switching system, a printed circuit board including means for mounting a plurality of trunk circuits, a microprocessor connected to each of the trunk circuit mounting means in an identical manner, and printed circuit board connector means connected to the microprocessor for providing means for connecting the printed circuit board to an operation bus in the telephone switching system.
9. For use in a telephone switching system as defined in claim 8, means for mounting microprocessor memory means on each printing circuit board, connected to a corresponding microprocessor.
10. For use in a telephone switching system which utilizes central processor operated trunk circuits:
(a) a printed circuit board, including first means for connecting said board to a central processor address and data bus means, (b) a microprocessor mounted on a printed circuit board, connected to said first connecting means, (c) means for connecting a plurality of trunk circuits in a standard and similar manner to the microprocessor on the printed circuit board, and (d) means for connecting a memory to the microprocessor whereby the microprocessor can be caused to operate the trunk circuits as predetermined types of trunk circuits.
(a) a printed circuit board, including first means for connecting said board to a central processor address and data bus means, (b) a microprocessor mounted on a printed circuit board, connected to said first connecting means, (c) means for connecting a plurality of trunk circuits in a standard and similar manner to the microprocessor on the printed circuit board, and (d) means for connecting a memory to the microprocessor whereby the microprocessor can be caused to operate the trunk circuits as predetermined types of trunk circuits.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA297,885A CA1101971A (en) | 1978-02-28 | 1978-02-28 | Trunk control system |
| JP10137878A JPS54133007A (en) | 1978-02-28 | 1978-08-18 | Telephone exchange system |
| GB7833898A GB2015302B (en) | 1978-02-28 | 1978-08-18 | Trunk control system |
| FR7827660A FR2418597B1 (en) | 1978-02-28 | 1978-09-27 | INTERCURRENT NETWORK CONTROL SYSTEM |
| DE19782846626 DE2846626C2 (en) | 1978-02-28 | 1978-10-26 | Circuit arrangement for a telephone exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA297,885A CA1101971A (en) | 1978-02-28 | 1978-02-28 | Trunk control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101971A true CA1101971A (en) | 1981-05-26 |
Family
ID=4110880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA297,885A Expired CA1101971A (en) | 1978-02-28 | 1978-02-28 | Trunk control system |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS54133007A (en) |
| CA (1) | CA1101971A (en) |
| DE (1) | DE2846626C2 (en) |
| FR (1) | FR2418597B1 (en) |
| GB (1) | GB2015302B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU537749B2 (en) * | 1980-02-20 | 1984-07-12 | Gec Plessey Telecommunications Limited | Digital telephone exchange with fast control signal processor. |
| DE3017741C2 (en) * | 1980-05-09 | 1984-09-27 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Circuit arrangement for control devices in telecommunications, in particular telephone switching systems |
| DE3129941A1 (en) * | 1981-07-29 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Method for retrofitting subscriber services in a centrally controlled telecommunications system, in particular a telephone PABX system |
| IT1209457B (en) * | 1982-01-28 | 1989-08-30 | Italtel Spa | ELECTRONIC DIRECTION SELECTOR FOR TELEPHONE SWITCHING SYSTEMS. |
| DE3220511C3 (en) * | 1982-06-01 | 1987-03-26 | Telefonbau & Normalzeit Gmbh | CIRCUIT ARRANGEMENT FOR A TELECOMMUNICATION SYSTEM WITH CONNECTION-INDIVIDUAL CABLE TRANSMISSIONS. |
| DE3334766A1 (en) * | 1983-09-26 | 1985-04-11 | Siemens AG, 1000 Berlin und 8000 München | MULTIPROCESSOR CENTRAL CONTROL UNIT OF A SWITCHING SYSTEM, IN PARTICULAR TELEPHONE SWITCHING SYSTEM |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2342611A1 (en) * | 1976-02-27 | 1977-09-23 | Thomson Csf | CONTROL DEVICE FOR A SWITCHING SYSTEM AND PROCESS FOR IMPLEMENTING SUCH A DEVICE |
| JPS52109315A (en) * | 1976-03-10 | 1977-09-13 | Hitachi Ltd | Channel system controlling method |
-
1978
- 1978-02-28 CA CA297,885A patent/CA1101971A/en not_active Expired
- 1978-08-18 JP JP10137878A patent/JPS54133007A/en active Pending
- 1978-08-18 GB GB7833898A patent/GB2015302B/en not_active Expired
- 1978-09-27 FR FR7827660A patent/FR2418597B1/en not_active Expired
- 1978-10-26 DE DE19782846626 patent/DE2846626C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2015302A (en) | 1979-09-05 |
| FR2418597A1 (en) | 1979-09-21 |
| GB2015302B (en) | 1982-02-24 |
| FR2418597B1 (en) | 1986-04-11 |
| JPS54133007A (en) | 1979-10-16 |
| DE2846626C2 (en) | 1984-04-12 |
| DE2846626A1 (en) | 1979-08-30 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |