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Cisco Catalyst 2955 Series switches consist of the following devices:

• Cisco Catalyst 2955T-12—Twelve 10/100 ports and two fixed 10/100/1000BASE-T uplink ports

• Cisco Catalyst 2955C-12—Twelve 10/100 ports and two fixed 100BASE-FX multimode uplink ports

• Cisco Catalyst 2955S-12—Twelve 10/100 ports and two fixed 100BASE-LX single-mode uplink ports

Currently, non-Ethernet Layer 2 networks are evolving from traditional fieldbuses or proprietary technologies to

standards-based Ethernet networks. The progression to Ethernet is driven by a multitude of factors, including:

• Standardization—There are hundreds of millions of Ethernet devices around the world; Ethernet has become the

prevalent Layer 2 technology based on widely adopted standards.

• IP Connectivity—Ethernet is the most ubiquitous Layer 2 technology for Internet connectivity, in turn providing

unprecedented communications potential to networks that have been traditionally isolated.

• Bandwidth—Orders of magnitude above other existing technologies, Ethernet takes advantage of the increased

computational power of the new network hosts (I/O devices, motion machinery, sensors, intelligent electronic

devices, etc.) being deployed today. This allows for real-time control and data gathering for a multitude of

applications that were not previously feasible, including preventive maintenance, total quality control

monitoring, remote monitoring, and asset management and optimization.

• Multiple services on a single infrastructure—Intelligent Ethernet allows a single network to carry multiple vendor

implementations of control [EtherNet/IP, Modbus TCP, Foundation Fieldbus High Speed Ethernet (HSE) and

various Advanced Traffic Management Systems (ATMS)], and to use the same investment to also deliver

traditional voice (telephony), data (e-mail, technical support, and browsing), and video services (video

monitoring).

• Multilayer integration—All of the elements described above allow for the integration of higher-level applications

such as enterprise resource planning (ERP), manufacturing execution systems (MES), and advanced traffic

management systems to the floor control layer (programmable logic controllers [PLCs], PC-based control

systems, traffic control equipment, and human-machine interfaces [HMIs]). This allows for a true flow of data

and automation from the demand side (customer placing and order) to the factory floor (assembly line) or from

the monitoring devices in a freeway all the way to the emergency response systems, as well as real-time control

in SCADA applications. As organizations increasingly rely on Ethernet networks, it is important to ensure high

availability, security, scalability, and control. By adding Cisco IOS Software functionality to new network

applications, users can now deploy network-wide intelligent services that address these requirements in a

consistent way—from the I/O or monitoring device to the core and through the WAN.

Cisco Catalyst 2955 Series switches offer enhanced data security through numerous security features. These features

allow customers to enhance network security with capabilities to secure traffic through the protection of passwords

and configuration information; to provide options for network security based on users, ports, and Media Access

Control (MAC) addresses; and to enable more immediate reactions to intruder and hacker detection.