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
  • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
  • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
  • H04Q3/523—Details
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M7/00—Arrangements for interconnection between switching centres
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L49/00—Packet switching elements
  • H04L49/10—Packet switching elements characterised by the switching fabric construction
  • H04L49/104—Asynchronous transfer mode [ATM] switching fabrics
  • H04L49/105—ATM switching elements
  • H04L49/106—ATM switching elements using space switching, e.g. crossbar or matrix
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L49/00—Packet switching elements
  • H04L49/25—Routing or path finding in a switch fabric
  • H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports

Definitions

• the invention relates to a coupling network for communication devices for the optional connection of input lines combined in a plurality of input line groups with at least one output line group.
• a coupling network is already from "IEEE JOURNAL ON SELECTED AREAS IN COMMUNICA TIONS", Vol. 9, No. 8, October 1991, pages 1299 to 1307.
• the respective coupling element arrangement in the funnel structure is designed in several stages in order to optionally connect an even number of input lines to a number of output lines corresponding to half the number of input lines.
• the number of individual coupling elements for the implementation of the funnel structure of the respective coupling element arrangement thus means that a relatively high outlay on circuitry is required, which is sometimes undesirable.
• FIG. 1 shows a coupling network according to the abovementioned prior art
• FIG. 2 shows in schematic form a coupling network to which the present invention is applied
• FIG. 3 shows a first exemplary embodiment of the coupling element arrangements shown in FIG. 2,
• FIG. 4 shows a second exemplary embodiment for the coupling element arrangements shown in FIG. 2
• FIG. 5 shows an exemplary embodiment for coupling element arrangements according to FIG. 2 distributed over two modules.
• the input lines are labeled El to E128, while the output lines are labeled AI to A128.
• the input lines and output lines are subdivided into input line groups or output line groups, each with a fixed number of input lines or output lines.
• An input line group is formed here from 32 input lines, an output line group, however, from 16 output lines.
• a total of four input line groups and 8 output line groups are formed in the assumed example.
• Each of the 8 output line groups is assigned a separate coupling element arrangement.
• the coupling element arrangements which are designated KAU to KA18, are connected on the input side in parallel to the four input line groups.
• the coupling element arrangements which each have the same structure, are each formed in several stages using coupling elements with 32 inputs and 16 outputs in the form of a funnel.
• the coupling elements are designated SE.
• a first stage has four coupling elements, each of which is connected to one of the input line groups. This is followed by a second stage, which consists of two coupling elements. The outputs of the coupling elements of the first stage are fed to their inputs. On the output side, the coupling elements of the second stage are finally connected to a coupling element forming a third stage. This coupling element with its 16 outputs is connected to one of the output line groups.
• the coupling network shown in FIG. 1 and implemented according to the prior art thus has 7 coupling elements per coupling element arrangement in the assumed example, i.e. a total of 56 coupling elements.
• FIG. 2 shows a switching network according to the present invention, which can be used, for example, in communication devices operating according to an asynchronous transfer mode ("asynchronous transfer mode" ATM), such as ATM switching devices or ATM "cross connects", to be able to forward specified message cells for this transfer mode.
• asynchronous transfer mode ATM
• This coupling network corresponds to the coupling network shown in FIG. 1 except for the implementation of the individual coupling element arrangements.
• the coupling element arrangements are shown in FIG. 2 4 labeled KA21 to KA28. These coupling element arrangements are each formed only in one stage, four coupling elements SE with 32 inputs and 16 outputs each being provided in this single stage. Here, too, one of the input line groups is connected to each of these coupling elements.
• the outputs of the coupling elements are individually assigned to the 16 outputs of an output line group. However, only one of the corresponding four outputs of the coupling elements, which are assigned to one and the same output line, is optionally through
• Switching means can be connected to the relevant output line.
• FIG. 3 shows a first exemplary embodiment for the implementation of the individual coupling element arrangements shown in FIG.
• 64 input lines can optionally be connected to 16 output lines.
• Two coupling elements SE each with 32 input lines and 16 output lines, are provided for this.
• the previously mentioned switching means are designed in such a way that the corresponding two outputs of the coupling elements, which are assigned to one and the same output line, are connected to one another in the manner of a “wired-or” link.
• Each of these two outputs can optionally be controlled in an active or high-resistance state, so that at any given time only one of the two outputs is connected to the output line in question.
• the control takes place via a control bus CB connected to the two coupling elements.
• the outputs of the coupling elements are also controlled in such a way that they operate bit-synchronously. Switching over with the switching means the connected outputs of the coupling elements can take place, for example, after the transmission of a message cell or when a so-called empty cell occurs if periodically repeated empty cells are inserted into the cell stream to be forwarded to the respective output line.
• control signals can be send commands which are sent cyclically to the coupling elements.
• FIG. 4 shows a further exemplary embodiment for realizing the individual coupling element arrangements shown in FIG. This corresponds essentially to the exemplary embodiment previously described with reference to FIG. 3. The only difference is in the configuration of the switching means for connecting the corresponding outputs of the coupling elements SE to one in question
• a multiplex device MUX is connected downstream of the coupling elements.
• the two multiplex devices MUX have eight separate input pairs, each of which is individually assigned an output connected to one of the output lines.
• the multiplex devices each have an 8X2: 1 structure.
• the two corresponding outputs of the coupling elements SE which are assigned to one and the same output line, are connected to an input pair, the multiplex devices being controllable via the control bus CB in such a way that only one input pair at a time Input is connected to the associated output line.
• the sequence of the switching can be carried out by control signals transmitted via the control bus.
• This in The exemplary embodiment shown in FIG. 4 can also be modified in the assumed example in such a way that instead of the multiplex devices individually assigned to the coupling elements, only such a multiplex device is used which in the example has more than 16
• This multiplex device therefore has a 16X2: 1 structure.
• FIG. 5 shows the case in which 128 input lines can optionally be connected to 16 output lines with a coupling element arrangement.
• the four coupling elements SE required for this two may be accommodated on an assembly A, while the remaining two coupling elements may be accommodated on an assembly B.
• the outputs of the two coupling elements present on an assembly are provided with switching means according to one of the exemplary embodiments explained above. Since, due to this separate accommodation of the coupling elements and thus due to different line lengths, transit time differences can occur in the transmission of message cells, the outputs of the two modules (16 per module) are connected to a phase adjustment device PH, which on the output side connects to the 16 output lines connected. This phase adjustment device compensates for the runtime differences mentioned. In the event that the switching means according to the second exemplary embodiment are designed as multiplex devices, the phase adjustment can also be carried out using these multiple devices.
• the coupling network explained above can be used not only in ATM communication devices, but also in general in communication devices which are designed for a transmission principle which differs from the asynchronous transfer mode mentioned.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• Mathematical Physics (AREA)
• Data Exchanges In Wide-Area Networks (AREA)
• Communication Control (AREA)
• Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
• Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (2)

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Family Cites Families (5)

• 1995
  • 1995-09-29 DE DE19536522A patent/DE19536522A1/de not_active Withdrawn
• 1996
  • 1996-09-17 DK DK96942245T patent/DK0852865T3/da active
  • 1996-09-17 AT AT96942245T patent/ATE248472T1/de not_active IP Right Cessation
  • 1996-09-17 ES ES96942245T patent/ES2206612T3/es not_active Expired - Lifetime
  • 1996-09-17 CA CA002233467A patent/CA2233467C/en not_active Expired - Fee Related
  • 1996-09-17 WO PCT/DE1996/001758 patent/WO1997012487A2/de not_active Ceased
  • 1996-09-17 EP EP96942245A patent/EP0852865B1/de not_active Expired - Lifetime
  • 1996-09-17 KR KR1019980701992A patent/KR19990045749A/ko not_active Withdrawn
  • 1996-09-17 JP JP51305897A patent/JP3329824B2/ja not_active Expired - Fee Related
  • 1996-09-17 DE DE59610690T patent/DE59610690D1/de not_active Expired - Fee Related
  • 1996-09-20 IN IN1670CA1996 patent/IN189085B/en unknown
  • 1996-09-23 TW TW085111614A patent/TW312888B/zh active
• 1998
  • 1998-03-03 NO NO980916A patent/NO980916L/no unknown

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