EP1110343A1 - Wdm ring network - Google Patents
Wdm ring networkInfo
- Publication number
- EP1110343A1 EP1110343A1 EP99952300A EP99952300A EP1110343A1 EP 1110343 A1 EP1110343 A1 EP 1110343A1 EP 99952300 A EP99952300 A EP 99952300A EP 99952300 A EP99952300 A EP 99952300A EP 1110343 A1 EP1110343 A1 EP 1110343A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signals
- network
- ring
- network element
- protection
- 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.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0295—Shared protection at the optical channel (1:1, n:m)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
- H04J2203/006—Fault tolerance and recovery
Definitions
- a ring network with predominantly unidirectional data transport, e.g. for data transport within the Internet or for video distribution services, data from a central network element, e.g. an internet server, transmitted to the participant.
- a central network element e.g. an internet server
- the invention has for its object to provide a circuit arrangement and a method with which the transmission capacity of a ring network with predominantly one-sided data transport can be used.
- the invention has the advantage that the transmission capacity is used with predominantly one-sided data transport on the ring network while the transmission security remains the same.
- the invention has the advantage that data can also be transported from the subscriber to the central network element of the ring. Further advantageous embodiments of the circuit arrangement and the method are ben in the other claims angege ⁇ .
- FIG. 1 shows a structure and the data transport routes of a conventional ring network
- FIG. 2 shows a structure and the data transport routes of a ring network according to the invention
- FIG. 3 shows an embodiment of a central network element
- FIG. 4 shows an embodiment of a network element
- Figure 5 shows an embodiment of network elements, each terminating one half of the ring network
- Figure 6 shows a further embodiment of network elements, each terminating one half of the ring network.
- ring structures are preferably used, in which individual network elements for coupling out or coupling in data are integrated.
- the ring structure enables the transmission of data which, when transmitted directly to the subscriber, are referred to as working signals.
- the data to be transmitted to the subscriber are also transmitted to the subscriber as protection signals on a second transmission path within the ring because of the required high data security. This type of data transmission ensures a high degree of transmission security when the ring is interrupted.
- FIG. 1 an implementation according to the prior art is shown.
- a central network element A and a plurality of network elements B to G are arranged in the ring.
- the data are transmitted with a synchronous transfer mode STM, 16 x STM-1 signals, e.g. fed from a central internet server.
- the data are fed into the ring both clockwise as working signals W on a working path WW and counterclockwise as protection signals P in a protection path PW.
- the working path WW is shown with a continuous line and the protection path PW is shown with a broken line.
- network elements B and C continue to be reached via the working path.
- the network elements D to G are supplied with the protection signals P.
- a subnetwork connection protection SNCP method which is also referred to as a path protection method, is used as the protection method.
- This method is particularly suitable for unidirectional data traffic, since it offers the same transmission capacity in the ring as a shared ring protection method.
- the control of the working and protection signals is easy to implement, since no switchover protocols are required for a switchover in the network elements.
- the switchover in the network elements takes place on the receiving side on the basis of local information.
- 2 shows the data paths within the ring according to the invention.
- the working path WWR, WWL is shown with a continuous line and the protection path PWR, PWL is shown with a broken line.
- the ring is logically divided into two ring halves, starting from network element A.
- the central network element A which can also be referred to as gateway node A
- 32 x STM-1 signals are fed into the ring.
- 16 x STM-1 signals are fed into the ring as working signals WR on the working path WWR clockwise and 16 x STM-1 signals as working signals WL on the working path WWL counterclockwise.
- the protection signals PR, PL are transmitted on separate paths from the central network node A to the final network element pair D, E, between which the first and second parts of the ring adjoin one another.
- data fed into the ring is passed in the left half of the ring or the first part of the ring counterclockwise as protection signals passed on to network elements G and F up to network element E. Only in the firing network element E are the protection signals fed into the ring and run in the opposite direction to the working signals in the right half of the ring or in the second part of the ring to the central network node A. The same procedure is used with the in the left half of the ring or data fed into the first part of the ring.
- FIG. 3 shows an embodiment of the central network node A.
- the core of the central network node A is an add / drop multiplexer A / D-MUX, to which 32 x STM-1 signals are fed.
- the add / drop multiplexer A / D-MUX is designed with a tributary connection T, a switching matrix KF and optical STM-16 line interfaces east and west.
- the line interfaces east and west emit optical signals, formed for example by selective lasers with specific wavelengths ⁇ l and ⁇ 2.
- An optical splitter OSO, OSW and an optical filter OFO, OFW are arranged in series at the line interfaces east and west.
- the optical signal ⁇ l is divided into working signals ⁇ lWL and protection signals ⁇ lPL.
- the optical signal ⁇ 2 is divided into working signals ⁇ 2WR and protection signals ⁇ 2PR.
- the working signals ⁇ lWL of the line interface OST and the protection signals ⁇ 2PR which were formed in the optical splitter OSW at the line interface West, are added in the optical filter OFO and form an optical signal ⁇ lWL and ⁇ 2PR. Accordingly, an optical signal ⁇ 2WR and ⁇ lPL is formed in the opposite direction by the optical filter OFW.
- the working and protection signals ⁇ lWL, ⁇ 2PR or ⁇ 2WR, ⁇ lPL are each forwarded to the next network elements G, F, E or B, C, D.
- FIG. 4 shows an embodiment of the network elements B, C, F and G of the ring.
- the protection signal ⁇ lPL in the optical filters OF of the network elements B, C in the right half of the ring is bypassed the network elements B, C in the right half of the ring.
- the working signal ⁇ 1WL is fed to the add / drop multiplexer A / D-MUX at the line interface west, certain signals TL are coupled out to subscribers TL connected to this network element through the coupling field KF and are fed to the subscriber TL via a tributary connection T.
- Portions of the working signal ⁇ lWL to be forwarded are again coupled via the line interface east with the optical filter OF into the data stream on the working path WWL of the ring, so that an optical signal ⁇ lWL and ⁇ 2PR is produced again.
- the protection and upstream signals can be applied to the A / D MUX at the east line interface.
- a specific signal for a subscriber in network elements B, C is coupled out using the same procedure and the rest of the working signal is coupled in again, and protection and upstream signals are forwarded.
- FIG. 5 shows an embodiment of the final network elements D and E, which each terminate one half of the ring network.
- the working signal ⁇ lWL is decoupled from the final network element E and fed to a line interface east of the final network element E.
- the protection signal ⁇ 2PR is optionally supplied to the line interface east of the final network element D via an optical amplifier OA.
- the protection signals ⁇ 2PR which were previously forwarded to the auxiliary protection path HPWR in the left half of the ring, reach the protection path PWR of the right half R of the ring network RN.
- the protection signals ⁇ lPL which were previously forwarded on the auxiliary detection path HPWL in the right half R of the ring network RN, reach the protection path PWL of the left half via the line interface west, the switching matrix KF and via the line interface east L of the ring network.
- FIG. 6 shows a further embodiment of the network elements D and E, which each terminate one half of the ring network.
- This embodiment differs from that shown in FIG. 5 in that data is sent from a subscriber TL connected to these network elements to other network elements or to the central network element A within the left or right half of the ring.
- the protection signal ⁇ 2PR is fed from the optical filter OF via a tributary connection to the switching matrix KF of the network element E.
- the protection upstream data transport is also supplied in the switching matrix KF.
- the sum signal from the protection signal ⁇ 2PR and protection upstream signal and the sum signal from the protection signal ⁇ lPL and protection upstream signal are emitted between the line interfaces east of the network element D and the line interface west of the network element E.
- the upstream data stream in the ring reduces the capacity of the data fed into the central network element A accordingly.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19839609 | 1998-08-31 | ||
DE19839609 | 1998-08-31 | ||
PCT/DE1999/002442 WO2000013361A1 (en) | 1998-08-31 | 1999-08-04 | Wdm ring network |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1110343A1 true EP1110343A1 (en) | 2001-06-27 |
Family
ID=7879299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99952300A Withdrawn EP1110343A1 (en) | 1998-08-31 | 1999-08-04 | Wdm ring network |
Country Status (7)
Country | Link |
---|---|
US (1) | US6920508B1 (en) |
EP (1) | EP1110343A1 (en) |
JP (1) | JP2002524916A (en) |
CN (1) | CN1315093A (en) |
AU (1) | AU6461799A (en) |
BR (1) | BR9913649A (en) |
WO (1) | WO2000013361A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030147356A1 (en) * | 2002-02-07 | 2003-08-07 | Jan Vandenhoudt | High speed healing ring for optical transport networks |
KR100506206B1 (en) | 2002-10-16 | 2005-08-05 | 삼성전자주식회사 | 2-fiber optical ring network |
FR2856861B1 (en) * | 2003-06-30 | 2007-01-19 | Cit Alcatel | WAVELENGTH MULTIPLEXING RING OPTICAL NETWORK AND SIGNAL TRANSMISSION PROTECTED BY LOCAL STATE SWITCH CONSECUTIVE TO LOCAL INTERRUPTION DETECTION |
US7526197B2 (en) * | 2003-12-29 | 2009-04-28 | Fujitsu Limited | Utilizing the protecting bandwidth in a SONET network |
DE102004055330A1 (en) * | 2004-11-16 | 2006-05-24 | Bosch Rexroth Aktiengesellschaft | Method and device for operating a network |
EP1667374B1 (en) * | 2004-12-03 | 2011-09-21 | Sony Corporation | Apparatus connection interface, apparatus control system and method of controlling apparatus control system |
CN100428726C (en) * | 2006-09-21 | 2008-10-22 | 成都迈普产业集团有限公司 | ATM data transmission system and data transmission method |
JP4991254B2 (en) | 2006-11-17 | 2012-08-01 | 株式会社東芝 | Dual ring network communication control method and dual ring network transmission station |
JP5338400B2 (en) * | 2009-03-13 | 2013-11-13 | 日本電気株式会社 | Optical transmission system |
JP5633469B2 (en) * | 2011-05-11 | 2014-12-03 | 富士通株式会社 | NETWORK, FAILURE RECOVERY METHOD, AND NODE DEVICE |
JP5433671B2 (en) * | 2011-12-09 | 2014-03-05 | 株式会社東芝 | Duplex ring network transmission station and method of rebuilding when anomalies occur in the duplex ring network |
JP6514132B2 (en) * | 2016-02-23 | 2019-05-15 | 日本電信電話株式会社 | Optical concentrator network system, optical transmission apparatus and optical transmission method |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5159595A (en) * | 1988-04-08 | 1992-10-27 | Northern Telecom Limited | Ring transmission system |
US5517498A (en) * | 1993-09-20 | 1996-05-14 | International Business Machines Corporation | Spatial reuse of bandwidth on a ring network |
IT1267645B1 (en) * | 1994-12-09 | 1997-02-07 | Cselt Centro Studi Lab Telecom | RING COMMUNICATION STRUCTURE ON OPTICAL VECTOR AND RELATIVE RECONFIGURABLE NODE. |
DE19506216A1 (en) * | 1995-02-22 | 1996-08-29 | Deutsche Telekom Ag | Method and arrangement for optimal use of the transmission capacity in synchronous bidirectional ring networks |
US6256292B1 (en) * | 1996-07-11 | 2001-07-03 | Nortel Networks Corporation | Self-healing line switched ring for ATM traffic |
US6728205B1 (en) * | 1997-02-19 | 2004-04-27 | Massachusetts Institute Of Technology | Method and apparatus for automatic protection switching |
US6233074B1 (en) * | 1998-05-18 | 2001-05-15 | 3Com Corporation | Ring networks utilizing wave division multiplexing |
-
1999
- 1999-08-04 WO PCT/DE1999/002442 patent/WO2000013361A1/en not_active Application Discontinuation
- 1999-08-04 BR BR9913649-0A patent/BR9913649A/en not_active Application Discontinuation
- 1999-08-04 AU AU64617/99A patent/AU6461799A/en not_active Abandoned
- 1999-08-04 US US09/786,062 patent/US6920508B1/en not_active Expired - Fee Related
- 1999-08-04 JP JP2000568214A patent/JP2002524916A/en not_active Withdrawn
- 1999-08-04 EP EP99952300A patent/EP1110343A1/en not_active Withdrawn
- 1999-08-04 CN CN99810048.XA patent/CN1315093A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO0013361A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6920508B1 (en) | 2005-07-19 |
WO2000013361A1 (en) | 2000-03-09 |
BR9913649A (en) | 2001-06-05 |
JP2002524916A (en) | 2002-08-06 |
CN1315093A (en) | 2001-09-26 |
AU6461799A (en) | 2000-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69531594T2 (en) | Communication network with a ring structure via an optical carrier and reconfigurable nodes for this structure | |
DE69333423T2 (en) | Optical concentrator and optical transmission network with such a concentrator | |
DE19731494C2 (en) | Method and arrangement for data transmission using wavelength division multiplexing in an optical ring network | |
DE69635006T2 (en) | Ring network with wavelength division multiplexing for message transmission | |
DE69632711T2 (en) | Optical, transparent, self-healing news ring network | |
DE69627165T2 (en) | OPTICAL TRANSMISSION SYSTEM | |
DE69131668T2 (en) | METHOD AND DEVICE FOR OPTICAL SWITCHING | |
DE69813606T2 (en) | TELECOMMUNICATIONS NETWORK WITH COMMON PROTECTIVITY ARCHITECTURE | |
DE69228991T2 (en) | SELF-HEALING BIDIRECTIONAL LOCAL RING NETWORK WITH SHUTTER DISTRIBUTORS | |
DE3856531T2 (en) | Time and wavelength division switching system | |
DE69731910T2 (en) | Optical network with protection arrangement | |
WO1991009476A1 (en) | Transmission device with an optical transmission path | |
DE60125638T2 (en) | Efficient network error protection architecture | |
EP1110343A1 (en) | Wdm ring network | |
DE69634149T2 (en) | OPTICAL KNOT IN AN OPTICAL BUS NETWORK | |
EP0969618B1 (en) | Optical two-fibre ring network | |
DE60212558T2 (en) | Optical TDM and WDM switching node | |
EP0651528B1 (en) | Optical transparent ring network with redundant paths | |
DE19832039A1 (en) | Node of a point-to-multipoint network | |
DE10343615A1 (en) | Network node for an optical communications network | |
DE60215566T2 (en) | A method of managing multiple errors of various types in a circular communications network | |
DE69934058T2 (en) | Device for insertion and removal of a wavelength division multiplexed optical signal | |
DE69835579T2 (en) | Method and apparatus for optically transparent transmission in a bi-fiber bidirectional ring network, self-protection and low-priority management | |
EP1371163B1 (en) | Self-healing ring structure for the optical transmission of information by wavelength division multiplexing and corresponding add/drop-multiplexer | |
EP3242425B1 (en) | Method for more effective data transmission in an optical telecommunication network in wavelength multiplex operation of optical wavelengths, wherein the optical telecommunication network has one super ordinate network node, a second superordinate network node and a plurality of network elements, optical telecommunication network, computer program and computer program product |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20010209 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 20070809 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS S.P.A. |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20071220 |