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Breakdowns and defects are detected as close as possible to their origin. These tests are performed by robots located in units of special terminals.

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A French system of this type is described for example in the patent application No. Malfunction monitor control circuitry for central data processor of digital communication system. In addition the corresponding modules are served by separate power supplies.

In a preferred embodiment, the MD signal distribution modules are located in the cells of the switching network and the supervision is made by the microprocessors markers. In the autocommitateur according to the invention, facilities are divided into two sets: Removable program location test. Sending a message cuors a logical machine is operated in the same manner that the recipient is in the same control unit or in another.

Each D1 binding Dr comprises a clock and a synchronization signal. The Manager maintains status of managed devices tables and counters faults recovered for him to decide the isolation of equipment in autocommutateur threshold exceeded the number of faults. Year of fee payment: Methods, systems and computer program products for connecting and monitoring network equipment in a telecommunications system.

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The architecture described relates to an auto switch for telematics applications, but some details of the example specifically concern a telephone exchange. Following a failure detection by preventive test autocommutaetur a path comprising a plurality of security blocks, the logical machine connection network management RQM activates ambiguity resolution tests in order to determine autocommutageur safety block to be UT CB out or service by performing active tests on “parts” of the failed path.


The choice of active beam may be carried out independently by the microprocessor of each terminal unit. Alarm monitoring arrangements for digital telecommunications switching networks. Some logical machines may be repeated in multiple microprocessors. C 8, connecting with peripherals: Figure 3 shows an example of MD signal distribution module.

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Small modular communications switching system with distributed programmable control. The purpose of the invention is to provide a defense system, applied to a system of the latter type and removing to it any of its characteristics of modularity and flexibility.

However, such a system still has drawbacks in the defense plan because it requires specific links between the two levels, and the other processors of the second level are not commonplace, requiring their duplication. A disadvantage of this solution is the fact that it is necessary to duplicate processors in the second level. A defense device of a distributed control PABX. On the other hand helps repair has a removable part in maintenance programs PA loaded machine logic removable loading programs, MPA at sutocommutateur request of an operator, and activated by the logical machine monitor MMR and secondly to PDT test programs loaded into memory a recipient microprocessor activated by the logical machine MLR management control network.

In this application the peripheral control units PCU are not autpcommutateur to the switching network no AM coupler. In the case of controlled exchanges by autocommutatekr central computer, technical more developed in the 70s, the defense is centralized: Increasing the reliability of components and the development of means test led to seek protection devices capable of increasing service quality and reducing elective procedures and frequency of regular maintenance work of the equipment.

System and method for providing in-band and out-of-band testing of telecommunications network components. Method and apparatus for path testing in a time division multiplex switching network. CH Ref legal event code: Each terminal is connected to a subscriber AB AB p, respectively.

These clock circuits and CBT comprise synchronization as shown Figure 4 a base circuit BT internal time, which develops SYT synchronization signals and autocommugateur clock signals h1 to h4 necessary for terminal units UT, as well as circuits CS1 to CS4 synchronization multiplex links. The alarm panel includes indicator lights indicating the urgency of the alarm and the identity of the offending equipment.


The configuration shown includes the system management tasks and exchanges mentioned above, and designated SGTE, and the following logical machines: In this way, reconfigurations are transparent to most programs. The PABX temporal switching network shown schematically in Figure 1, comprises the following components: We now know the advantages of distributed control systems, due in particular benefits to changing mieroproces- sors and software.

They carry out state consistency checks, various information, such as: The logical machines correspond to logically independent functions: The RIT links are tested by sending messages on one of them to all active processors, then on the other link.

Date of ref document: These principles are applied to all types of terminal units: Disk and autoclmmutateur managed by the logical machine disk management files, FGM. It also controls the line circuits LC via an IS interface supervision and control. Each group of units is connected by two beams F autocom,utateur four multiplex links for access to four planes of the switching network.

Of “watchdogs” control the occupancy times of the main paths of information and release them in case of overflow.

It acts on the reconfiguration of autocomkutateur subassemblies safety blocks. An effective defense requires capability for early detection of faults and quick system response, for example by switching on emergency organ, precise location means the offending organ, and means the effective action of the emergency personnel: This indeed has its own oscillator.

A microprocessor has access to the system bus S-BUS and to a resident bus, not shown, for the management of resources located on the processor board CPU: