DE1277940B - Method for error detection in telecommunication systems, in particular telephone switching systems, controlled by central facilities - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

H 04m

H04q

German class: 21 a3- 68/30

Number: 1277 940

File number: P 12 77 940.7-31 (S 101728)

Filing date: January 31, 1966

Opening day: September 19, 1968

The invention relates to a method for error detection in each case by one of two or more central facilities alternately controlled telecommunication systems, in particular telephone switching systems, in which faulty organs are automatically located and switched off.

In telecommunications, in particular telephone switching systems Depending on where they occur, errors can be caused by malfunctions or destruction of switching means, switching elements or central devices to the failure of one more or lead less large part of the switching system. To avoid this, it is advisable to to automatically determine the faulty organ after an error message and, for example, in the German Auslegeschrift 1118 274 described to lock. Blocking is only possible, however, if the failure of the blocked organ does not prevent the operation of the telecommunications switching system very limited or if the organ is intended to act as a central special facility twice or more than once, so that if one central facility fails, a replacement facility is immediately available and can be switched on in place of the first one (e.g. German business patent 26 716). »5

In telecommunications switching systems controlled by central facilities it is especially the markers that are only available in very small numbers and are therefore intended for reserve markers will. If an error is now found, then, according to the article »Measures to ensure the reliability in the telephone exchange system HE-60L "from Willrett in" SEL messages " 1963, issue 3, especially page 148, initially all of them automatically connected to this connection participating markers and coupling matrices locked. In order not to unnecessarily block connections, the switching matrix is not locked again after a few seconds. On the other hand, the marker remains conditionally blocked, d. H. the second marker takes over all further marking games. But should If another error occurs, the marker that was last in operation is blocked and the first released for operation again, so that an error does not put both markers out of operation can.

This known method has the disadvantage that due to the - even if only briefly - connection of the second marker, any errors in the switching matrix are sufficient to make it unusable close. A subsequent switch back to the first marker then leads to the ge process for error detection

in through central facilities

controlled telecommunications,

in particular telephone exchanges

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, 8000 Munich 2, Witteisbacherplatz 2

Named as inventor:

Wolfgang Pollack, 8000 Munich

possibly to the fact that the first marker also fails completely.

The object of the invention is now to show a method that allows when errors occur In the work area of a central facility, the failure of the central one that can be switched on as a replacement is guaranteed To prevent facilities or the blocking of all central facilities.

According to the invention this is achieved in that when switching over from one to be switched off central device on one to be connected this is blocked against its first occupancy for as long, until it is established that there is no such error that would allow the newly connected central facility would prevent, or until an organ found to be defective is shut down and so the bug is ineffective.

With the invention it is possible in a simple manner to overcome the disadvantages of the known Procedure to avoid. If an error occurs that leads to the disruption or destruction of a central Facility, a substitute facility cannot also go through it when it is put into operation Errors are disturbed or destroyed. Since the error detection in the so-called exchange time is carried out, the error information appears on the error detection Switching means separated from the work information of the central facilities, so that the type and location of a Errors are easier to spot. The error detection can be done regardless of the central facilities be carried out, d. H. test methods are conceivable that would otherwise interfere with the central facilities could.

The workflow and the mode of operation of the method for error detection according to the invention

809 617/99

3 4

The disturbances caused by permanent 1 states are shown on the basis of one in the drawing Embodiment for implementation struggled to be determined, but their cause is

of the procedure explained. not always

While in FIG. 1 a block diagram of a remote recognizable and localizable. The actual fault location intercom with central facilities, e.g. B. Mar-5 remains unknown or ambiguous. The errors can kierernMl to Mn, a sequence control circuit A , depending on their type, either only interfere with the marker exchange and an intermediary work of the marker or a management network K is shown schematically, will have a destructive influence on the marker. F i g. 2 shows how a check for incorrect When using the method according to the invention on the control cores to the markers Ml, ... io training, the location of the error can now be localized. Can be made with existing potentials. there will be an occasion to replace the marker

Via the switching network K according to FIG. 1, initially the operating marker M1, which is blocked from switching matrices or other through-switching, for further work. So that all test facilities can be set up, availability in the work area of the markers can identify such misbindings from a calling subscriber, e.g. B. 15 are carried out, which can cause destruction from the subscriber Tn A to a called subscriber. The marker M is in the idle state, for example for the subscriber TnB, to be set up. state, but keeps its connection contacts4 ge-The switching network K is in each case not closed.

ter the influence of one of the markers Ml to Mn. A function test relay D shown in FIG. 2. Each of these markers has a common 20 for the detection of those faults which can cause Zer control lines 1 access to the switching network faults, via its response unit K. Since a single marker covers the entire entanglement D I excited. The holding winding DII can mediation system to operate it, and the weite- Funktionsprüfrelais will exist simultaneously relaisren marker only to the exchange, its own contacts dl respectively operated to d4 to the control lines 1, only one set of Anschaltekontakten connected 25th The other end of the holding winding of which each connection contact set here through D II is at the most negative potential U, which is present in the one single connection contact 4 to 6 indicated electronic circuits of the marker Ml, but is much more positive than the official

The markers are in a known manner even with voltage of z. B. -60 V, so that during the test for detecting errors serving switching means 30 is not equipped with power to the electronic circuits. If an error occurs, it reports that it flows through the winding. The reverse current path operating markers, e.g. B. the marker is blocked by a rectifier Gl. For through-Ml, and this error affects the Ablaufsteuer- guide the test, the Ansprechwicklung D I A circuit for the Mark Out exchange, exchange turned off by the flow in the control circuit A for the straight working Markiererder marker Ml by opening 35th If the function of the connection contacts 4 is switched off and a replacement test relay D does not de-energize, this is a sign that one of the control lines 1 is incorrectly connected to one of the connection contacts 5 by closing one of the control lines 1, for example, the marker M2. In the potential or a wrong potential leads. In this marker exchange time, the faulty organ will trap the connection contacts 4 individually or localized and opened in a known manner from the traffic 40 in groups one after the other until the stop is taken. Before the replacement marker then disappears the potential. This process can be started by operation, and a condensation contact d5 is initiated and terminated by influencing the sequence role of the remaining and newly produced current control circuit A. Thus circles are carried out. Correspondingly, the faults that can lead to a routine replacement of the markers, which can lead to malfunctions in the marker, can first be localized. If such are present from the sequence control circuit A after an error, the corresponding current-fixed time segments must be made circles can remain disconnected or can be switched off. otherwise when the marker is replaced the destroyed

Faults that initiate an exchange of markers in the newly switched on marker and would not be eliminated by the exchange. If the switch-off has taken place or if there are no such errors occurring outside of the marker, then after the aufind, must be recognized as such and the incorrect successive opening of the connection contacts 4 organ must be switched off so that the localization does not occur through the marker Ml Another error, a permanent exchange of the markers , is interrupted when the new marker Ml is switched on while the switching system is operating. 55 Co-operation of function test relays continued who-These disturbances are mainly caused by the fact that the connection contacts 5 of the marker are empty potential states on the information Ml individually or in groups one after the other of the control lines 1 between the switching. After closing all the connection contacts management network K and the respectively connected one, the fault-detecting switching means of the marker are caused. So-called permanent markers M 2 are effective, the response of which results in 1-states on the information cores, which would also indicate that there are errors. Idle state of the switched on marker not depending on whether an error message should be present and errors in the through- only from marker Ml or from both connections can cause kierernMl and M 2, can refer to the location of the error and then, for example because they are to Double connections 65 are closed, which in the marker Ml itself or lead, can be determined by the marker. Since the mark can be in the work area of the markers, but also in the error-free process many so-only when receives or transmits so-called permanent 1 states after the so-called possible localization, errors in the work area, which z. B. by the

Run control circuit A can be effected, appropriate shutdowns are made, the newly switched on marker M 2 is released by unlocking for its first occupancy, so that it can take over its tasks.

The test method according to the invention has the advantage that any error is eliminated before the Replacement marker starts operating. This interrupts the operation of the switching system Permanent exchanges are excluded and it is ensured that ίο the replacement marker takes over a completely perfect working area. This has the further advantage that the markers are not equipped with expensive short-circuit-proof components or circuits need to be, but can be built more simply. By having the exam limited to the marker replacement time, the marker working hours are limited by the test not extended. If the described assignment of individual tests to each is taken into account Temporary phases of the marker exchange are particularly favorable conditions for error detection and localization achieved. This makes it easy to identify the type and location of the error if in the a phase the error information does not coincide with the work information. the particularly harmful errors that can lead to the destruction of switching devices are still under Participation of the first marker detected and switched off, while the less dangerous with the In any case, the second marker that is still intact can be discovered and switched off.

Claims (5)

Patent claims: 1. Method for error detection in each case by one of two or more central facilities alternately controlled telecommunications, in particular telephone switching systems, in which faulty organs are automatically located and switched off, characterized in that that when switching from a central device (Ml) to be switched off to one (M 2) to be connected this is blocked against its first assignment until it is determined that there is no such error that would allow the newly connected central to work properly Device (M 2) would prevent, or shut down an organ found to be faulty and so the bug is ineffective. 2. The method according to claim 1, characterized in that the error and error location determination as well as making the error ineffective before opening the connection contacts (4) of the device to be disconnected central facility (Ml) initiated with their blocking against further work will. 3. The method according to claim 2, characterized in that in the time of locking the to be switched off central device (Ml) until the opening of the connection contacts (4) of this central Facility to check for errors that cause destruction can. 4. The method according to claim 3, characterized in that the check for such errors which can cause destruction, is carried out with a function test relay (D) that has a response winding (DI) is energized in preparation, and via a holding winding connected to lines to be checked (control lines 1) (DII) only continues if there is an incorrect potential on lines (1) is. 5. The method according to claim 4, characterized in that for error detection and / or for error localization the connection contacts (4) of the central device (Ml) to be switched off opened individually or in groups one after the other and / or the connection contacts (5) of the connection to be connected central device (M 2) are closed individually or in groups one after the other. Considered publications:
German Auslegeschrift No. 1118 274;
"SEL-Nachrichten", 1963, no. 3, p. 148. 1 sheet of drawings 809 617/99 9.68 © Bundesdruckerei Berlin