CN1146836A - Protection scheme for add/drop multiplexer - Google Patents
Protection scheme for add/drop multiplexer Download PDFInfo
- Publication number
- CN1146836A CN1146836A CN95192715A CN95192715A CN1146836A CN 1146836 A CN1146836 A CN 1146836A CN 95192715 A CN95192715 A CN 95192715A CN 95192715 A CN95192715 A CN 95192715A CN 1146836 A CN1146836 A CN 1146836A
- Authority
- CN
- China
- Prior art keywords
- card
- protection
- ltu
- outpost
- tributary
- 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.)
- Pending
Links
- 230000003213 activating effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012795 verification Methods 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
Abstract
An SDH telecommunications system includes a plurality of tributary cards through which signals are switched, a protection card can protect the tributary cards and a multiplex controller controls the output of a plurality of line termination (LTU's) units there being one LTU unit provided respectively for each tributary card including the protection card, the multiplex controller being arranged to switch signals from a faulty tributary card to the protection card through the LTU associated with the faulty tributary card but without involving any switching taking place within the faulty tributary card so as to effectively replace the faulty tributary card.
Description
The present invention relates to a telecommunication system protection scheme, it is used for protecting an an outpost of the tax office of this system and when breaking down it being changed.
Protected system works in Synchronous Digital Hierarchy (SDH) mode; information wherein is that a series of byte information are transmitted with bit form; the grade of transmission rate is 34/45 and 140 megabits, and includes the add-drop multiplexer system, and this add-drop multiplexer usually is called as AdMux.The objective of the invention is protection scheme as the branch road card failure; and make the branch service during the branch road card replacement interrupt reducing to minimum as a kind of maintenance tool; this mechanism should not influence the external business interface and only provide protection to an an outpost of the tax office; and the front and back of switching between an outpost of the tax office, signal all is sent to same port or receives from same port.
According to the present invention as can be known, the SDH telecommunication system comprises some an outpost of the tax offices, a block protection card and a multiplex controller.An outpost of the tax office is used for switching signal; protection card is used for a protection an outpost of the tax office; multiplex controller then is used to control the output of some LTU Line Termination Units (LTU ' s); be respectively each an outpost of the tax office and comprise that protection card provides a LTU Line Termination Unit; multiplex controller switches to protection card by the LTU relevant with the fault branch card with the signal of this fault branch card, and does not cause that any switching of fault branch card inside is so that change the fault branch card effectively.
The realization of protection switching does not relate to the fault card like this, so no matter prop up an outpost of the tax office what's wrong, and the present invention can protect the normal operation of protection system.When the protection operation relates to some function of fault branch card, just do not belonged to this situation.
Switching between the card can be finished under the control of multiplex controller automatically, also can manually control and finish.Manually under the control situation, can control by an appropriate managerial interface of network.
This arrangement is preferred, and promptly after the fault branch card was replaced, controller can disconnect protection card, and recovers to use a new an outpost of the tax office.
In the present invention, switch by following inner detection criteria operation for automatic ruuning situation protection and be necessary, be the example of some criterions below:
(a) the non-odd-even check mistake of internal interface
(b) response of control inquiry is failed
(c) control bus agreement check failure
(d) WatchDog Timer overflows on the card
(e) program checksum error on the card
(f) ASIC inquiry circulation failure on the card
(g) overflow on the ASIC internal buffer/descend to overflow
No matter under the automatic or manual state, can correctly carry out for protection is switched, must follow following sequence incident:
1. the switch card protection for protection card must be under an embargo
2. business is copied to protection card
3. protection card is made download configuration
4. the output state on the fault card is under an embargo, and switches relevant LTU
5. start the protection output state on the buffer memory card subsequently
Be appreciated that from the fault branch card to protection card between transfer period, message transmission has some time delays.If system works in automatic control state under multiplex controller control, in general should finish this switching in 3 seconds after an an outpost of the tax office detects fault, yet for manual operation, switch and preferably within 8 seconds, can finish, be meant from suitable interface input command to the time of giving operator's the affirmation in these 8 seconds.
Be appreciated that container bytes can produce mistake during selected incoming traffic is switched.For with switch unit protective device compatibility; or prevent that the switch unit faulty indication from appearring in not protected switch unit, should be within the lasting check-verifying period that switches the diagnostic message verification by switching the maximum duration that causes between an outpost of the tax office from any interruption of switch unit outgoing traffic.
For easy to understand the present invention, embodied an example of the switched system structure of inventive concept below with reference to description of drawings, the single legend of accompanying drawing provides being connected between protected an outpost of the tax office and the multiplex controller with the block diagram form.
Described an an outpost of the tax office " 1 " among the figure and arrived " n " and a protection card " 10 ", each an outpost of the tax office is connected with " 1n " with corresponding LTU Line Termination Unit " 11 ", " 12 " respectively, and protection card " 10 " is connected with its LTU " 20 ".As shown in the figure, each LTU links to each other with multiplex controller " 21 ", and each LTU except LTU " 20 " all have a switching device shifter with the protection bus " 23 " link to each other, LTU " 20 " just can be switched to one of other suitable LTU like this.All there is an output port each unit simultaneously; any Plesiochronous Digital hierarchy (PDH) signal of receiving of LTU can directly be routed to the card relevant with this LTU or to protection bus " 23 " like this; all switchings are all carried out under the control of controller " 21 ", and the left end of the protection bus that will be left automatically of handover operation and protected card disconnects as shown in Figure 1.
5 protection buses are arranged in this example, and three is 34/45 megabit, and one is 34 megabit Transmultiplexer TMUXs, and one is used for 140 megabit signals." a " on the terminal unit of 34 megabit cards connects and linked 34 megabits protection bus " 1 ", and " b " terminal is connected to 34 megabits protection bus " 2 ", or the like the rest may be inferred.140 megabit cards only use terminating terminal " d ", and it can insert 140 megabits protection bus.34 megabit Transmultiplexer TMUX cards use terminal unit terminal " a ".Protection card " 10 " is arranged in the right that is right after of protected an outpost of the tax office of switching device interface slot " 1 " to " n "; insert relevant protection terminal unit in the terminal unit interface slot relevant with protection card, this unit will protect bus to be connected to the input and the output of protection card.
Being appreciated that of being in operation in an outpost of the tax office " 1 " to " n " is interrupted action suddenly, protection card is with access circuit.Protection card " 10 " will enter on the suitable protection bus " 23 " by unit " 20 " and travel back across relevant LTU subsequently, and transmission just can continue like this.This just provides an alternate route effectively and efficiently for signal, and makes protection begin to carry out, and system still can normally move when job card is replaced like this, and after job card was replaced, system was recovered automatically, and protection card " 10 " stops moving.
Claims (4)
1.SDH telecommunication system comprises some an outpost of the tax offices, a protection card and a multiplex controller; an outpost of the tax office is used for switching signal; protection card can be protected an an outpost of the tax office; multiplex controller is controlled the output of some LTU Line Termination Units (LTU ' s); be respectively each an outpost of the tax office and comprise that protection card provides a LTU unit; multiplex controller is arranged by the LTU relevant with the fault branch card signal to be switched to protection card from this fault branch card; and need not to relate to any switching of fault branch card inside, so just can change the fault branch card effectively.
2. the telecommunication system of claim 1 wherein has device and is used for activating between the card automatically switching.
3. the telecommunication system in the claim 1 wherein has device and is used for switching between the manual control card.
4. telecommunication system, have basically as here preamble with reference to the device of description of drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9405771A GB9405771D0 (en) | 1994-03-23 | 1994-03-23 | Telecommunications system protection scheme |
| GB9405771.8 | 1994-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1146836A true CN1146836A (en) | 1997-04-02 |
Family
ID=10752383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95192715A Pending CN1146836A (en) | 1994-03-23 | 1995-03-21 | Protection scheme for 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE504521C2 (en) * | 1995-06-01 | 1997-02-24 | Ericsson Telefon Ab L M | Multiplexer, protective switching unit, telecommunication network and method of multiplexing |
| SE504533C2 (en) * | 1995-06-01 | 1997-03-03 | Ericsson Telefon Ab L M | Demultiplexer, protective switching unit, telecommunications network and method of demultiplexing |
| GB2354905B (en) * | 1999-10-01 | 2004-02-11 | Hewlett Packard Co | Multi-channel network monitoring apparatus,signal replicating device,and systems including such apparatus and 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 |
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 JP JP7524481A patent/JPH09510589A/en active Pending
- 1995-03-21 CN CN95192715A patent/CN1146836A/en active Pending
- 1995-03-21 WO PCT/GB1995/000618 patent/WO1995026084A1/en not_active Application Discontinuation
- 1995-03-21 AU AU19019/95A patent/AU689557B2/en not_active Ceased
- 1995-03-21 EP EP95911448A patent/EP0752178A1/en not_active Withdrawn
- 1995-03-22 ZA ZA952347A patent/ZA952347B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| AU689557B2 (en) | 1998-04-02 |
| GB9405771D0 (en) | 1994-05-11 |
| AU1901995A (en) | 1995-10-09 |
| GB9505559D0 (en) | 1995-05-03 |
| ZA952347B (en) | 1995-12-15 |
| GB2290432B (en) | 1998-06-10 |
| JPH09510589A (en) | 1997-10-21 |
| GB2290432A (en) | 1995-12-20 |
| EP0752178A1 (en) | 1997-01-08 |
| WO1995026084A1 (en) | 1995-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |