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The choice of active beam may be carried out independently by the microprocessor of each terminal unit. The KDE desktop is represented by the “kde-workspace” and “plasma-desktop” packages and the Xfce desktop by the “xfdesktop” package. The apache autocommutateur server is listed as “httpd” and the Linux kernel is listed as “linux”.

: Put the fun back into computing. Use Linux, BSD.

These are loaded from disk, at the request of the operator, and then transferred and activated in the designated microprocessor, previously blocked manually. An example of unit of subscriber autocommutateeur is shown in Figure 2.

Disk and coupler managed by the logical machine disk management files, FGM. A difficulty arises when attempting a defense system well suited to a distributed control system without losing any of the advantages of flexibility and modularity of it. The alarm panel includes indicator lights indicating autocommktateur urgency of the alarm and the identity of the offending equipment. Programme amovible de test de localisation. Naturally oscillators have their own fault detection means.

Abréviations des cours | Centre de la sécurité des télécommunications

We now know the advantages of distributed control systems, due in particular benefits to changing mieroproces- sors and software. The defense operates locally and call made to the next level when there is an external impact to a body. The primary means for fault detection will be described as an example. Furthermore, the monitoring logic machine provides testing capabilities and defense of the controller, data management and help with the development.

For reasons of defense and modularity, the connections between the central switching network and the groups of terminal units GUT, GUC and control are organized in bundles F Figure 1each beam combining two multiplex links, a link distribution of clock and synchronization link.

The two disks are managed by separate microprocessors. 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.


Les liaisons qui interconnectent ces organes sont les suivantes: In case where multiple versions of a package are shipped with a distribution, only the default version appears in the table. Each group of units is connected by two beams F distributing four multiplex links for access to four planes of the switching network.

This can let us know which distribution is more up to date, or if a feature has been introduced into one distribution but not the other. 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.

The control unit is thus replaced – the user’s point of view – a logical network of machines. DE Date of ref document: The entire software is stored on a duplicated disk for security reasons. For example, suppose a group of GUT terminal units is supervised by a CPU control unit which performs a cyclic scanning of all terminal units UT it supervises.

The PABX temporal switching network shown schematically in Figure 1, comprises the following components: The logical machines correspond to logically independent functions: Preventive test paths driven by the logic machine connection network management MGX uses the MGT terminal management logical machines for orders loopback and internal closures AM and terminal units UT couplers.

The software is distributed by the nature of the system.

Each RIT RIT bond and 2 comprises five son pairs to dours station connected, providing the calling features, access authorization, clock, transmission and reception. It also controls the line circuits LC via an IS interface supervision and control.

The operating system is performed by a resident kernel that is repeated for each control unit. Alarm monitoring arrangements for digital telecommunications switching networks. Pabz RIT links are tested by sending messages autocommutatur one of them to all active processors, then on the other link. Each oscillator delivers a clock signal H 1, H 2, H 3, and a frame synchronization signal SY 1, SY 2, SY 3 of a autpcommutateur equal to the frame frequency of the multiplex links.

Of “watchdogs” control the occupancy times of the main paths of information and release them in case of overflow. Asymmetric digital subscriber line provision flow control on digital subscriber line access multiplexer switches. Method and apparatus for path testing in a time division multiplex switching network. This indeed has its own oscillator. The logical machine MLR management control network provides runtime control by delay.


Method and system for providing redundancy for signaling link modules in a telecommunication system.

This allows a distributed defense associated with centralized maintenance. In Figure 9, the lower block, MAN abnormal messages, shows the detection and defense there associated with abnormalities detected by the user programs.

Abréviations des cours

AR and AM couplers allow access by semaphore mode and are for example of the type described in the French patent application already cited by the applicant. Integrated analog-digital switching system with modular message store-and-forward facilities. To know the state of the system and controlling the reconfiguration, the logic machine control network management interrogates periodically all microprocessors.

The IF training sequence of each microprocessor contains a simplified control of the whole CPU card microprocessor, memory, coupler AR vours organized test for the location of the faulty card.

In this way, reconfigurations are transparent to most programs. Compare Packages Between Distributions. The reset indicator is performed following repair validation tests. For this purpose the implantation of logical machines is controlled by a logical machine for managing the control network, MLR, the control system being constituted by the control assembly, the links point to point RIT.

The Manager maintains status of managed devices tables pahx counters faults recovered for him to decide the isolation of equipment in case threshold exceeded the number of faults. La figure 3 montre un exemple de module de distribution de signaux MD. Or, a modular switch necessarily comprises a number of blocks or groups of devices, and the second control level can be either integrated in these groups, or external, in which case a processor of this level is not necessarily assigned rigidly to a group.

In this application the peripheral control units PCU are not connected to the switching network no Autocommutsteur coupler. The defense system is organized into three levels: