WO1995026084A1 - Protection scheme for sdh add/drop multiplexer - Google Patents
Protection scheme for sdh add/drop multiplexer Download PDFInfo
- Publication number
- WO1995026084A1 WO1995026084A1 PCT/GB1995/000618 GB9500618W WO9526084A1 WO 1995026084 A1 WO1995026084 A1 WO 1995026084A1 GB 9500618 W GB9500618 W GB 9500618W WO 9526084 A1 WO9526084 A1 WO 9526084A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- card
- tributary
- protection
- faulty
- cards
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
-
- 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
- This invention relates to a telecommunications system protection scheme for
- the system is one which operates on the synchronous digital hierarchy (S.D.H.) and
- the information is transmitted in bit form in a series of bytes of information.
- AdMux add drop multiplexer
- a SDH telecommunications system includes a plurality of tributary cards through which signals are switched, a protection card is included for the tributary cards and a multiplex controller controls the output of a plurality of line termination (LTU's) units there being one unit provided respectively for each tributary card
- LTU's line termination
- the multiplex controller being arranged to switch signals from
- the switching between cards may be done automatically under the control of the multiplex controller or altematively it may be hand controlled. In the latter case it will be controlled via a suitable management interface of the network.
- the arrangement is preferably such that when the faulty tributary card has been replaced, the controller will switch out the protection card and revert to the use of the tributary card.
- switching is preferably
- switch unit protection mechanism or to prevent an indication of switch unit failure in the case of an unprotected switch unit, the maximum duration of any disruption of traffic from the output of the switch unit, due to switching between tributary cards, will be within the
- the figure shows the tributary cards “1” to “n” and a protection card “10".
- Each of the tributary cards is connected to a line termination unit (LTU) respectively "11", "12”,
- the protection card "10” is connected to its own LTU "20".
- Each of the LTU's is connected to a multiplex controller "21”, as shown, and each of the LTU's, apart from the
- LTU 20 has a switching mechanism which is connected to a protection bus "23" so that the
- LTU "20" can be switched through to one of the other appropriate LTU's. Each of the units also has an output port.
- any plesiochronous digital hierarchical signal (P.D.H.) received on an LTU can be routed either directly to the card associated with the LTU or to the protection bus "23". All switching is under the control of the controller "21" and operation of the switch automatically disconnects the rest of the protection bus to the left of the card being protected, as viewed in fig. 1.
- the related protection termination unit is inserted. This unit connects the protection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU19019/95A AU689557B2 (en) | 1994-03-23 | 1995-03-21 | Protection scheme for SDH add/drop multiplexer |
JP7524481A JPH09510589A (en) | 1994-03-23 | 1995-03-21 | Communication system protection scheme |
EP95911448A EP0752178A1 (en) | 1994-03-23 | 1995-03-21 | Protection scheme for sdh add/drop multiplexer |
NO963947A NO963947L (en) | 1994-03-23 | 1996-09-20 | Protection plan for SDH multiplexes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9405771.8 | 1994-03-23 | ||
GB9405771A GB9405771D0 (en) | 1994-03-23 | 1994-03-23 | Telecommunications system protection scheme |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995026084A1 true WO1995026084A1 (en) | 1995-09-28 |
Family
ID=10752383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1995/000618 WO1995026084A1 (en) | 1994-03-23 | 1995-03-21 | Protection scheme for sdh add/drop multiplexer |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0752178A1 (en) |
JP (1) | JPH09510589A (en) |
CN (1) | CN1146836A (en) |
AU (1) | AU689557B2 (en) |
GB (2) | GB9405771D0 (en) |
WO (1) | WO1995026084A1 (en) |
ZA (1) | ZA952347B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996038943A1 (en) * | 1995-06-01 | 1996-12-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Demultiplexer, a protection switch unit, a telecommunication network and a method of demultiplexing |
WO1996038939A1 (en) * | 1995-06-01 | 1996-12-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiplexer, protection switch unit, telecommunications network and a multiplexing related method |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2394849A (en) * | 1999-10-01 | 2004-05-05 | Agilent Technologies Inc | Multi-channel replicating device for broadband optical signals, and systems including such devices |
US6925052B1 (en) | 1999-10-01 | 2005-08-02 | Agilent Technologies, Inc. | Multi-channel network monitoring apparatus, signal replicating device, and systems including such apparatus and devices, and enclosure for multi-processor equipment |
CN101136711B (en) * | 2007-09-29 | 2011-11-23 | 中兴通讯股份有限公司 | Optical terminal service, clock, cross service high integration veneer service smooth switch system of SDH system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2266644A (en) * | 1992-04-25 | 1993-11-03 | Plessey Telecomm | Overhead transmissions in a data communication system |
GB9311106D0 (en) * | 1993-05-28 | 1993-07-14 | Plessey Telecomm | Switch plane maintenance |
-
1994
- 1994-03-23 GB GB9405771A patent/GB9405771D0/en active Pending
-
1995
- 1995-03-20 GB GB9505559A patent/GB2290432B/en not_active Expired - Fee Related
- 1995-03-21 EP EP95911448A patent/EP0752178A1/en not_active Withdrawn
- 1995-03-21 WO PCT/GB1995/000618 patent/WO1995026084A1/en not_active Application Discontinuation
- 1995-03-21 CN CN95192715A patent/CN1146836A/en active Pending
- 1995-03-21 AU AU19019/95A patent/AU689557B2/en not_active Ceased
- 1995-03-21 JP JP7524481A patent/JPH09510589A/en active Pending
- 1995-03-22 ZA ZA952347A patent/ZA952347B/en unknown
Non-Patent Citations (1)
Title |
---|
M. ANDREWS ET AL.: "BT Northern Ireland STAR SDH Network-NISTAR", BRITISH TELECOMMUNICATIONS ENGINEERING, vol. 12, LONDON GB, pages 207 - 215, XP000405932 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996038943A1 (en) * | 1995-06-01 | 1996-12-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Demultiplexer, a protection switch unit, a telecommunication network and a method of demultiplexing |
WO1996038939A1 (en) * | 1995-06-01 | 1996-12-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiplexer, protection switch unit, telecommunications network and a multiplexing related method |
Also Published As
Publication number | Publication date |
---|---|
AU1901995A (en) | 1995-10-09 |
GB9405771D0 (en) | 1994-05-11 |
EP0752178A1 (en) | 1997-01-08 |
ZA952347B (en) | 1995-12-15 |
GB9505559D0 (en) | 1995-05-03 |
GB2290432A (en) | 1995-12-20 |
JPH09510589A (en) | 1997-10-21 |
AU689557B2 (en) | 1998-04-02 |
GB2290432B (en) | 1998-06-10 |
CN1146836A (en) | 1997-04-02 |
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