WO1999016216A1 - Kommunikationseinrichtung für die übertragung von nachrichtensignalen - Google Patents
Kommunikationseinrichtung für die übertragung von nachrichtensignalen Download PDFInfo
- Publication number
- WO1999016216A1 WO1999016216A1 PCT/DE1998/002778 DE9802778W WO9916216A1 WO 1999016216 A1 WO1999016216 A1 WO 1999016216A1 DE 9802778 W DE9802778 W DE 9802778W WO 9916216 A1 WO9916216 A1 WO 9916216A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- line
- lic
- communication device
- message
- cell
- Prior art date
Links
Classifications
-
- 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
- H04L49/254—Centralised controller, i.e. arbitration or scheduling
-
- 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
- H04L49/256—Routing or path finding in ATM switching fabrics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5625—Operations, administration and maintenance [OAM]
- H04L2012/5627—Fault tolerance and recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/30—Peripheral units, e.g. input or output ports
Definitions
- the invention relates to a communication device according to the preamble of patent claim 1.
- redundancy structures can be provided for the peripheral line assemblies belonging to it. Examples of this are the "1 + 1", the "1: 1” and the “1: N” line module redundancy, as described in "IEEE Journal on Selected Areas in Communications" VOL. 15, N.5, June 1997, pages 795 to 806.
- a "1 + 1" redundancy structure two line modules are operated in parallel in order to redundantly transmit message signal streams. However, only one of these redundant message signal streams is taken into account for further processing.
- the invention has the advantage that universal redundancy structures can be implemented by designing the conversion logic arrangement without having to access redundancy-specific elements.
- FIG. 1 shows a section of the schematic structure of a communication device according to the present invention
- FIG. 2 shows a section of the schematic structure of a communication device to be explained in more detail below
- FIG. 3 shows the schematic structure of a control device provided in the coupling element shown in FIG.
- the communication device KE shown in FIG. 1 may be an ATM communication device operating according to the asynchronous transfer mode, which enables the transmission of message signals in the form of message cells in the course of virtual connections. Since that
- the message cells belonging to a virtual connection each have an information part ("user part") and a cell header ("header").
- a cell header contains, among other things, a so-called virtual channel number VCI, which designates the respective virtual connection, and possibly a so-called virtual path number VPI, which is valid for the respective virtual connection
- the communication device KE has a central switching network ASN, which is connected to the switching system via a central switching system ASN-C (ASN core) with an associated switching system controller ASN-CC and via at least one ATM multiplexer AMX has.
- ASN-C ASN core
- ASN-CC ASN core
- AMX ATM multiplexer
- This communication device KE can be a so-called “cross connect” for setting up virtual permanent connections or a switching device (“switching node”) for setting up virtual dial-up connections. In both cases, the connections are set up with the aid of the aforementioned coupling arrangement controller ASN-CC and the controller AMX-C. However, since this establishment of virtual connections is not the subject of the present invention, it will not be discussed in more detail below.
- a plurality of line modules are connected to the central switching arrangement ASN via the ATM multiplexing device AMX, for example via bidirectional electrical connections.
- the ATM multiplexing device may, for example, as indicated in FIG. 1, be designed for the connection of 16 line assemblies, which are designated LIC A0 to LIC AI5. These line assemblies are each intended for the connection of at least one peripheral transmission line.
- the transmission lines which may be designed for a bidirectional transmission of message signals, are designated A 1 to A 15 in accordance with their assignment to the line assemblies.
- a plurality of ATM multiplexing devices AMX can also be connected to the central switching arrangement ASN-C.
- the ATM multiplexing device AMX shown in FIG. 1 has at least one separate coupling element SE for both transmission directions, which in the exemplary embodiment each have a structure 16/16, ie have 16 inputs and 16 outputs. These coupling elements are controlled by the AMX-C controller of the AMX ATM multiplexing device.
- the control consists, among other things, in that, in the course of establishing virtual connections, a specific connection path is defined in each case via the respective coupling element.
- a specific routing address is contained in the cell header of the individual message cells for such a connection path set up, in order to be able to forward the respective message cell in a connection-appropriate manner via the coupling element SE in question, in accordance with this routing address.
- respective coupling element control means are provided in order to select a replacement path via the respective coupling element in the event of one of the line modules failing, according to a specific redundancy structure, without having to use the replacement path transmitting message cells must change the respective routing address contained therein.
- FIG. 2 shows a section of the schematic structure of a coupling element SE for the outgoing transmission direction.
- the equivalent switching principle just mentioned is explained in more detail with reference to this figure and FIG.
- the coupling element SE shown like any other of the coupling elements, has a central cell memory ZP, in which the message cells to be forwarded via the line assemblies LIC A0 to LIC AI5 are intermediately stored.
- the line assemblies LIC A0 to LIC AI5 are each individually assigned a logical queue, which are designated Q0 to Q15 in accordance with their assignment to the individual line assemblies.
- These logical queues are in accordance with the in routing addresses contained in the message cells can be individually controlled and are used for the temporary storage of address pointers, by means of which it is indicated where the message cells to be forwarded via the assigned line module are stored in the cell memory ZP.
- These address pointers are provided by the cell buffer ZP.
- the logical queues QO to Q15 are, for example, cyclically processed in succession in a defined order by a scanner which is not specified, with an address pointer being removed from each of the queues per cycle.
- the entered address pointers are read within the respective queue according to the FIFO principle.
- the address pointers provided by the cell memory ZP are entered into the queues in question with the aid of a queue controller QC. For this purpose, each time a message cell arrives, at least the part of the associated cell header is supplied in which the already mentioned routing address RA (FIG. 2) is contained.
- the waiting queue is then determined on the basis of this, into which the address pointer just provided has to be entered.
- the central part of the queue controller QC is a switching logic arrangement LPS, by means of which each routing address RA can be assigned one or more of any of the queues QO to Q15 and thus one or more line modules LIC A0 to LIC AI5.
- a register is kept in the switching logic arrangement LPS for each of the possible routing addresses contained in the message cells.
- Bit position reserved ie in the assumed example 16 bit positions are provided per register.
- a fixed logical level, for example "1”, in one or more bit positions of a register indicates in which of the queues the address pointer determined for this when entering a message cell is to be entered.
- a logic level "0" means that the assigned queue is blocked.
- the individual registers are at least in accordance with the in
- Message cells each containing the above-mentioned routing address RA can be controlled individually.
- the control takes place with the aid of a control logic arrangement designated QA in FIG. 3, to which the routing address contained in the associated cell header is supplied with each arrival of a message cell.
- the register contents of the switching logic arrangement LPS are preset by the AMX-C controller shown in FIG. 1 in a manner not shown in detail when the communication device KE (FIG. 1) is initialized, or if necessary, i.e. for example in an equivalent circuit mentioned at the beginning, individually changed.
- FIG. 3 again indicates that the switching queue arrangement LPS can individually control the individual queues QO to Q15 in accordance with the register contents mentioned, in order to accommodate the address pointers mentioned above for message cells stored in the cell buffer ZP (FIG. 2).
- the cell heads of the message cells each contain, in addition to a routing address, so-called “housekeeping” information, among other things. From this "housekeeping” information, among other things, the type of the respective message cell emerges, i.e. whether the respective message cell is a normal useful cell or a connection-specific control cell or a system-specific control cell.
- a cell filter FIL is provided in the control logic arrangement LPS or upstream of the control logic arrangement LPS. This cell filter is traversed by the "housekeeping" information of received message cells and the determined cell type is displayed.
- connection-specific control cells are forwarded in the manner specified above in accordance with the register contents of the control logic arrangement LPS.
- system-specific control cells are forwarded without changing the respective original connection paths characterized by a specific routing address. This can be done, for example, by directly entering the information (address pointer) required for forwarding such a control cell into the required queue.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98956780A EP1016249A1 (de) | 1997-09-19 | 1998-09-18 | Kommunikationseinrichtung für die übertragung von nachrichtensignalen |
CA002303895A CA2303895A1 (en) | 1997-09-19 | 1998-09-18 | Communication device for transmitting message signals |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19741431A DE19741431A1 (de) | 1997-09-19 | 1997-09-19 | Kommunikationseinrichtung für die Übertragung von Nachrichtensignalen |
DE19741431.1 | 1997-09-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999016216A1 true WO1999016216A1 (de) | 1999-04-01 |
Family
ID=7842977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/002778 WO1999016216A1 (de) | 1997-09-19 | 1998-09-18 | Kommunikationseinrichtung für die übertragung von nachrichtensignalen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1016249A1 (de) |
CA (1) | CA2303895A1 (de) |
DE (1) | DE19741431A1 (de) |
WO (1) | WO1999016216A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10140044A1 (de) * | 2001-08-16 | 2003-03-06 | Siemens Ag | Priorisierung von Verbindungen |
EP1309136A1 (de) * | 2001-11-01 | 2003-05-07 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Vorrichtung und verfahren zur Schutzumschaltung |
US7215664B2 (en) | 2001-11-01 | 2007-05-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Arrangement and method for protection switching |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5327552A (en) * | 1992-06-22 | 1994-07-05 | Bell Communications Research, Inc. | Method and system for correcting routing errors due to packet deflections |
US5331631A (en) * | 1990-10-03 | 1994-07-19 | At&T Bell Laboratories | N+K sparing in a telecommunications switching environment |
US5473598A (en) * | 1990-08-17 | 1995-12-05 | Hitachi, Ltd. | Routing method and apparatus for switching between routing and conversion tables based on selection information included in cells to be routed |
US5600630A (en) * | 1993-08-31 | 1997-02-04 | Hitachi, Ltd. | Path changing system and method for use in ATM communication apparatus |
-
1997
- 1997-09-19 DE DE19741431A patent/DE19741431A1/de not_active Withdrawn
-
1998
- 1998-09-18 CA CA002303895A patent/CA2303895A1/en not_active Abandoned
- 1998-09-18 EP EP98956780A patent/EP1016249A1/de not_active Withdrawn
- 1998-09-18 WO PCT/DE1998/002778 patent/WO1999016216A1/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5473598A (en) * | 1990-08-17 | 1995-12-05 | Hitachi, Ltd. | Routing method and apparatus for switching between routing and conversion tables based on selection information included in cells to be routed |
US5331631A (en) * | 1990-10-03 | 1994-07-19 | At&T Bell Laboratories | N+K sparing in a telecommunications switching environment |
US5327552A (en) * | 1992-06-22 | 1994-07-05 | Bell Communications Research, Inc. | Method and system for correcting routing errors due to packet deflections |
US5600630A (en) * | 1993-08-31 | 1997-02-04 | Hitachi, Ltd. | Path changing system and method for use in ATM communication apparatus |
Non-Patent Citations (1)
Title |
---|
RATHGEB E P ET AL: "THE MAINSTREETXPRESS CORE SERVICES NODE - A VERSATILE ATM SWITCH ARCHITECTURE FOR THE FULL SERVICE NETWORK", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, vol. 15, no. 5, June 1997 (1997-06-01), pages 795 - 806, XP000657033 * |
Also Published As
Publication number | Publication date |
---|---|
CA2303895A1 (en) | 1999-04-01 |
DE19741431A1 (de) | 1999-03-25 |
EP1016249A1 (de) | 2000-07-05 |
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