Appendix C Translated Safety Warnings

Power and Relay Connector

Attention Lorsque vous connectez ou déconnectez le connecteur alimentation et relais quand l'alimentation est allumée, un arc électrique risque de se produire. Un tel arc peut causer une explosion dans les installations en zones dangereuses. Assurez-vous de couper l'alimentation des circuits de commutation et d'alarme. Avant de continuer, assurez-vous également qu'il n'y a aucun risque de rebranchement accidentel de l'alimentation et que le site de travail ne présente pas de danger.

Si vous omettez de serrer à fond les vis imperdables du connecteur alimentation et relais, vous risquez de provoquer un arc électrique en cas de retrait accidentel du connecteur.

Warnung Wenn Sie den Stromzufuhr- und Relaisstecker anschließen oder herausziehen, während die Stromzufuhr eingeschaltet ist, kann sich ein elektrischer Bogen bilden. Dies kann bei Installationen in Gefahrenzonen zu einer Explosion führen. Überprüfen Sie, dass an Switch und Alarmschaltkreis kein Strom anliegt. Vergewissern Sie sich, dass die Stromzufuhr nicht versehentlich eingeschaltet werden kann, oder stellen Sie sicher, dass es sich beim gewählten Standort nicht um einen explosionsgefährdeten Bereich handelt, bevor Sie fortfahren.

Die unverlierbaren Schrauben am Stromversorgungs- und Relaisstecker müssen fest angezogen werden, da das versehentliche Herausziehen des Steckers zu einem elektrischen Bogen führen kann.

Avvertenza La connessione o disconnessione del connettore relè e di potenza con l'alimentazione inserita, può determinare la formazione di un arco elettrico. Ciò può causare un'esplosione in caso di installazioni in aree pericolose. Accertarsi di disinserire l'alimentazione dallo switch e dal circuito d'allarme. Prima di procedere, accertarsi che l'alimentazione non possa essere accidentalmente inserita o verificare che l'area non sia pericolosa.

Qualora non si serrassero perfettamente le viti prigioniere del connettore relè e di potenza, si potrebbe causare la formazione di un arco elettrico in caso di rimozione accidentale del connettore stesso.

 

Catalyst 2955 Hardware Installation Guide

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Cisco Systems Catalyst 2955 manual 78-14944-03

Catalyst 2955 specifications

The Cisco Systems Catalyst 2955 is a robust and versatile Ethernet switch designed for enterprises seeking reliable Layer 2 switching capabilities. Known for its steadfast performance and extensive feature set, the Catalyst 2955 is particularly favored for environments requiring high-density connectivity and advanced traffic management.

One of the hallmark features of the Catalyst 2955 is its support for IEEE 802.1Q VLAN tagging, which allows for efficient traffic segregation and helps improve network security. The switch can handle up to 256 virtual LANs, supporting a more organized network structure and optimized resource allocation. This VLAN capability is crucial for businesses that need to segment their networks for various departments or applications while maintaining efficient communication between them.

The Catalyst 2955 is equipped with a comprehensive Quality of Service (QoS) mechanism, which prioritizes critical applications and ensures that voice, video, and data traffic receive appropriate bandwidth. By providing features such as classification, marking, queuing, and congestion avoidance, the switch helps meet the demands of real-time applications, thereby enhancing user experience and productivity.

Another remarkable technology integrated into the Catalyst 2955 is Spanning Tree Protocol (STP), which prevents loops in redundant network connections. Enhanced with features like Rapid Spanning Tree Protocol (RSTP), this switch minimizes downtime by allowing for quicker convergence times in case of topology changes. The ability to support both STP and RSTP is vital for maintaining network stability and performance.

The Catalyst 2955 is also designed with network management and monitoring in mind. It includes features like Simple Network Management Protocol (SNMP), which enables administrators to manage network resources effectively and troubleshoot issues more efficiently. With support for Cisco’s proprietary software, it offers insights into traffic patterns and usage statistics that can aid in maintaining optimal network health.

Physical characteristics of the Catalyst 2955 include various configurations with either 24 or 48 ports, suitable for different deployment scenarios. The switch is designed for rack mounting, making it an ideal solution for data centers and enterprise networks where space is a consideration.

In summary, the Cisco Systems Catalyst 2955 stands out for its solid Layer 2 functionality, VLAN support, QoS capabilities, network stability features such as STP, and extensive management tools, making it an excellent choice for organizations aiming to enhance network resiliency and performance. Its balance of performance and manageability continues to make it a viable option in the competitive landscape of networking equipment.