US3469035A - Telecommunication switching systems - Google Patents

Telecommunication switching systems Download PDF

Info

Publication number
US3469035A
US3469035A US537838A US3469035DA US3469035A US 3469035 A US3469035 A US 3469035A US 537838 A US537838 A US 537838A US 3469035D A US3469035D A US 3469035DA US 3469035 A US3469035 A US 3469035A
Authority
US
United States
Prior art keywords
terminals
switch
terminal
switches
group
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 - Lifetime
Application number
US537838A
Other languages
English (en)
Inventor
Cecil Frederick John Hillen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3469035A publication Critical patent/US3469035A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0008—Selecting arrangements using relay selectors in the switching stages
    • H04Q3/0012—Selecting arrangements using relay selectors in the switching stages in which the relays are arranged in a matrix configuration

Definitions

  • This invention relates to telecommunication switching systems and in particular to systems employing switches each having a number of inputs and outputs. Each output of each switch is interconnected with an output of one or more other switches, the switches being arranged in a matrix of rows and columns.
  • the term matrix of rows and columns is used herein only as a means of identifying the respective switches which are not necessarily disposed in this manner in a practical layout.
  • each subscribers line is connected to a line switch giving access via a group of outlets to other selectors, the outlets being shared by a number of subscribers greater in number than the number of outlets in the group, according to specified traffic requirements.
  • the subscribers sharing the outlets are so arranged as to assure as far as possible that all groups of outlets are equally loaded, i.e. where subscribers are known to originate large volumes of traflic they do not share the same outlets leaving other outlets to be shared by subscribers generating less trafiic. This entails constant checks on trai'fic loading and the moving of subscribers from one group of outlets to another.
  • the object of the invention is to reduce the possibility of blocking, i.e. the condition when all the outputs of a particular switch are engaged, and to permit incoming circuits to be connected at random to the inputs of any switch, without the need to consider the amount of traffic originated by the incoming circuits.
  • a telecommunication switching system comprises a first group of terminals, a second group of terminals whose number is greater than that of the terminals in the first group, and a plurality of switches each having a first set of terminals connectible by the switch to a second set of switch terminals, the numbers of terminals in the first and second sets being the same for all switches and the terminals of the first set of terminals of each switch being numbered sequentially, the switches being arranged schematically in a matrix of rows and columns, the number of columns being equal to the number of terminals of the first set of terminals of a switch, each terminal of the second set of terminals of the switches being connected to a different one of the terminals of the second group of terminals while each numbered terminal of the first set of terminals of each switch in one row and column is connected to a different terminal of the first group of terminals and to the corre- I; nite States Patent O spondingly numbered terminal of the first set of terminals of
  • the matrix consists of equal numbers of columns and rows and in this specification such a matrix is referred to as a block.
  • a switching system may comprise a number of such blocks each of which may have its own unique first and second groups of terminals, or the corresponding terminals of the first group of terminals of the blocks may be commoned.
  • the system may comprise one or more blocks having their own unique first and second groups of terminals and other blocks of which corresponding first terminals of the first group of terminals are commoned.
  • a block may be enlarged by the addition of one or more switches.
  • Interconnection of the terminals of the first set of terminals of each switch in a block is arranged so that each terminal of the first group of terminals of the block is connected to a terminal of the first set of terminals of at least one switch in each row.
  • the number of rows and columns is a prime number.
  • FIG. 1 is a block schematic of a first embodiment, and, FIGS. 2, 3, 4, 5 and 6 are explanatory tables of connections.
  • FIG. 1 is a block schematic of a first embodiment and shows switches A1 A5, B1 B5, C1 C5, D1 D5 and E1 E5 each switch having a first set of terminals and a second set of terminals equal in number.
  • Each switch may be a crossbar switch, uniselector switches, a co-ordinate array of crosspoint switches or any other suitable form of switch enabling a number of terminals of the first set to be connected to an equal number of terminals of the second set.
  • each switch is in the form of a co-ordinate array of cross-points having 5 terminals in the first and second sets of terminals, the switches being arranged in a matrix, having 5 switches per row and 5 rows per block, making a total of 25 switches per block.
  • the first column comprises switches A1 AS, the second B1 E5, the third C1 .C5, the fourth D1 D5 and the fifth E1 E5.
  • the first set of terminals of a switch are designated 1A1 5A1, 1B1 5B1 and so on.
  • the block has a second group of terminals 1 and a first group of terminals 1 25. These 25 first terminals are divided into 5 groups, i.e. 5
  • each of these terminals of the first group is available to a, different combination of 25 terminals out of the 125 terminals of the first group of terminals.
  • FIG. 1 only the interconnection for the terminals 1A1 A1 from the A1 switch and the terminal 1B1 of the B1 switch are shown.
  • the interconnections shown are of a standardised pattern such that if x designates the number of a switch terminal in the first set it will be connected to the corresponding terminal x of a switch in the next row in a direction away from the terminal in the first set and in a column (x p) in advance which is defined as the direction A1 B1 C1 D1 -E1 A1 B1 p is afactor called the advance factor and has a value of from O to N where N is the number of columns.
  • the embodiment of FIG. 1 uses an advance factor p of 1, connections being made to switches in the next lower row in each case.
  • the first group of terminals is at the top of the matrix and connections are made to the terminals of the first sets of terminals of switches in successive rows moving downwardly. If the first group of terminals was shown at the bottom of the matrix, connections would be made to the first set of terminals of switches in successive rows moving upwardly.
  • switch A1 when x, the number of the switch terminal of the first set of switch terminals is 1, (x p) 1 1 0, i.e. no advance, and the terminal 1A1 of switch A1 is connected to the terminal 1A2 of switch A2.
  • FIG. 2 which lists in columns the interconnected switch first terminals.
  • the block shown in FIG. 1 can be enlarged to accommodate extra second group terminals by adding further switches.
  • the extra switches have their first sets of terminals connected to the first sets of terminals of the block by repeating the interconnection method of the block.
  • FIG. 1 shows a further row of switches A6 .E6 but only the connections to first terminals 1 5 of switch A6.
  • terminal 1A6 of an extra switch A6 schematically disposed beneath switch A5 is joined to terminal 1A5 of switch A5, terminal 2A6 is joined to terminal 2E5 of switch E5, terminal 3A6 is joined to terminal 3D5 of switch D5, terminal 4A6 is joined to terminal 4C5 of switch C5, and terminal 5A6 is joined to terminal 5B5 of switch B5. Further rows of switches could be added, interconnection then simply repeating the pattern of switches A1 E5.
  • switches each comprising a co-ordinate array of 7 x 7 terminals are used.
  • FIG. 3 shows the interconnections for the terminals of the first set of terminals of the A1 switch.
  • the first set of terminals of other switches are interconnected in like fashion.
  • FIG. 4 shows similar interconnections for 9 x 9 switches.
  • FIG. 5- shows the interconnections of the terminals of the first set of terminals of switch A1 of FIG. 1 using an advance factor of 4.
  • FIG. 6 shows similar interconnections using an advance factor of 5.
  • the interconnection of the terminals of the first set of terminals of switches B1, C1, D1 and E1 is similar to that of the terminals of the first set of terminals of switch A1 and that the interconnections between switches in adjacent rows is likewise similar.
  • the interconnections take on a standard pattern and, in practice, a standard preformed connection field would be used.
  • a switching system embodying the invention is suitable for use as a switching stage in an automatic telephone exchange and may be so connected that the second group of terminals are connected to subscribers and the first group of terminals are joined to other switching stages.
  • the system might also be used as the final selector in an automatic telephone exchange in which case the first group of terminals might be junctions from a preceding switching stage and the second group of terminals might be outgoing to subscriber lines.
  • the trafiic from one switch cannot busy all the terminals available to other switches in the same column as the one switch. Further, it will be apparent that the security of the system is relatively high because faults in a block of switches can occur whilst maintaining a minimum grade of service to all or the majority of terminals connected to the block.
  • control equipment to be used with the switching system embodying the invention can take any one of the well-known forms and for this reason will not be described in this specification.
  • a telecommunication switching system comprising in combination a first group of terminals, a second group of terminals whose number is greater than that of the terminals in the first group, and a plurality of switches each having a first set of terminals connectible by the switch to a second set of switch terminals, the numbers of terminals in the first and second sets being the same for all switches and the terminals of the first set of terminals of each switch being numbered sequentially, the switches being arranged schematically in a matrix of rows and columns, the number of columns being equal to the number of terminals of the first set of terminals of a switch, each terminal of the second set of terminals of the switches being connected to a difierent one of the terminals of the second group of terminals while each numbered terminal of the first set of terminals of each switch in one row and column is connected to a different terminal of the first group of terminals and to the correspondingly numbered terminal of the first set of terminals of a switch in a different row and in a column (x-p) relative to the
  • each column contains the same number of switches, that number being a prime number.
  • each row and each column contain the same number of switches, that number being a number which is not a prime number, and in which each numbered terminal of the first set of terminals of a switch is connected to the correspondingly numbered terminal of a switch in each row.
  • a telecommunication switching arrangement having first and second switching systems as claimed in claim 1 and in which each terminal of the first group of terminals of the first system is connected to one terminal of the first set of terminals of each switch of a different combination of switches of the second system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
US537838A 1965-03-29 1966-03-28 Telecommunication switching systems Expired - Lifetime US3469035A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1322365 1965-03-29

Publications (1)

Publication Number Publication Date
US3469035A true US3469035A (en) 1969-09-23

Family

ID=10019062

Family Applications (1)

Application Number Title Priority Date Filing Date
US537838A Expired - Lifetime US3469035A (en) 1965-03-29 1966-03-28 Telecommunication switching systems

Country Status (8)

Country Link
US (1) US3469035A (enrdf_load_stackoverflow)
JP (1) JPS5231683B1 (enrdf_load_stackoverflow)
DE (1) DE1487848C3 (enrdf_load_stackoverflow)
GB (1) GB1146686A (enrdf_load_stackoverflow)
IL (1) IL25466A (enrdf_load_stackoverflow)
MY (1) MY7000173A (enrdf_load_stackoverflow)
NL (1) NL6604137A (enrdf_load_stackoverflow)
SE (1) SE347415B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701112A (en) * 1971-06-04 1972-10-24 Bell Telephone Labor Inc Balanced, incomplete, block designs for circuit links interconnecting switching network stages

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945211A (en) * 1957-12-10 1960-07-12 Itt Non-blocking link-access switching system
GB946673A (en) * 1959-11-25 1964-01-15 Ass Elect Ind Improvements relating to telephone and like switching systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945211A (en) * 1957-12-10 1960-07-12 Itt Non-blocking link-access switching system
GB946673A (en) * 1959-11-25 1964-01-15 Ass Elect Ind Improvements relating to telephone and like switching systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701112A (en) * 1971-06-04 1972-10-24 Bell Telephone Labor Inc Balanced, incomplete, block designs for circuit links interconnecting switching network stages

Also Published As

Publication number Publication date
MY7000173A (en) 1970-12-31
JPS5231683B1 (enrdf_load_stackoverflow) 1977-08-16
DE1487848A1 (de) 1969-10-09
GB1146686A (en) 1969-03-26
DE1487848B2 (de) 1972-05-04
NL6604137A (enrdf_load_stackoverflow) 1966-09-30
DE1487848C3 (de) 1978-08-24
SE347415B (enrdf_load_stackoverflow) 1972-07-31
IL25466A (en) 1971-03-24

Similar Documents

Publication Publication Date Title
US4038638A (en) Efficient rearrangeable multistage switching networks
US4901309A (en) Cross-connect for switch modules
US5631902A (en) Digital cross-connect system
KR950013157B1 (ko) 재배열 가능한 다중접속 스위칭 회로망
JPS6143093A (ja) 再設定可能完全使用可能の多段階切換回路網
US4456987A (en) Digital switching network
US3700819A (en) Time division switching system with time slot interchange
EP0363822A2 (en) Broadcast network
US5103220A (en) Method of expanding a three-stage regular switching array
US3593295A (en) Rearrangeable switching network
US4910730A (en) Batcher-banyan network
US3916124A (en) Nodal switching network arrangement and control
US3980834A (en) Multi-stage connection switch frame
US3469035A (en) Telecommunication switching systems
US5043980A (en) Switching cell for packet switching network
US6087958A (en) Multi-stage routing switchers with sequential and non-repetitive distributive circuit interconnections
US7065076B1 (en) Modular scalable switching networks
JPH01109939A (ja) 交換節点に対する分類ユニット
US3317897A (en) Multi-stage switching network
US4245214A (en) Switching matrix
US4009351A (en) Switching arrangement for telecommunication switching systems
US3400220A (en) Switching network employing a homogeneous matrix
US3536849A (en) Multi-stage crosspoint switching network with homogeneous traffic pattern
US4023141A (en) Efficient one-sided rearrangeable multistage switching network
US3251945A (en) Circuit arrangement constructed in the manner of a coupling multiple for the connection of time multiplex telephone systems