GLOSSARY 131

C

call An association between two or more users or between a user and a network entity that is established by the use of network capabilities. This association may have zero or more connections.

cell An ATM Layer protocol data unit (PDU) characterized by fixed, rather than variable, length payloads.

cell delay variation A quantification of cell clumping for a connection. The cell clumping CDV (yk), is defined as the difference between a cell’s expected reference arrival time (ck) and its actual arrival time (ak). The expected reference arrival time (ck) of cell k of a specific connection is max[ck-1+T,ak]. T is the reciprocal of the negotiated peak cell rate.

cell loss ratio In a network/network element, cell loss ratio is (1-x/y), where y is the number of cells that arrive in an interval at the ingress of the network/network element; and x is the number of these y cells that leave at the egress of the network/network element.

CoreBuilder 7000 The 3Com CoreBuilder 7000/7000HD switch is a high-performance, modular ATM switch.

CLP Cell Loss Priority. A bit in the ATM cell header indicating that if there is a need to discard a cell, the cell with the CLP bit marked is to be discarded.

CLR Cell Loss Ratio. CLR is a negotiated QoS parameter and acceptable values are network specific. The objective is to minimize CLR provided the end-system adapts the traffic to the changing ATM layer transfer characteristics. The Cell Loss Ratio is defined for a connection as: Lost Cells/Total Transmitted Cells.

collision Overlapping transmission of two or more nodes onto media. All data is unusable.

connection An ATM connection consists of the concatenation of ATM Layer links in order to provide an end-to-end information transfer capability to access points.

connectionless A form of packet-switching that relies on global addresses in each communications packet rather than on predefined virtual circuits.

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3Com 7000 manual Glossary
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7000 specifications

The 3Com 7000 is a robust and versatile networking solution designed to meet the demands of enterprise environments. Renowned for its reliability and scalability, the 3Com 7000 is highly suitable for organizations requiring efficient data handling and enhanced network performance. This multi-layer switching platform integrates advanced technologies, making it a preferred choice for modern businesses.

One of the standout features of the 3Com 7000 is its modular architecture. This design allows businesses to customize their network according to specific requirements by adding or replacing various modules. The modularity ensures that organizations can scale their network operations without significant downtime or the necessity of overhauling existing infrastructure. Such flexibility is vital for growing enterprises that need to adapt to variable workloads.

The 3Com 7000 also incorporates advanced Layer 3 routing capabilities. This feature enhances the efficiency of data transmission and bolsters the overall responsiveness of the network. By allowing routing functions to occur directly on the switch, it reduces latency and optimizes traffic flow, which is critical for applications requiring high availability, such as VoIP and video conferencing.

Security is another core characteristic of the 3Com 7000. It comes equipped with built-in security protocols and features such as Access Control Lists (ACLs) and VLAN support, which segregate network resources and protect sensitive data. These security measures ensure that only authorized devices can access specific segments of the network, thus fortifying the organization's information security posture.

In terms of management, the 3Com 7000 offers an intuitive interface for monitoring and controlling network operations. It supports various management protocols and software, which facilitate streamlined administration and configuration. This ease of management can significantly reduce the operational burden on IT staff, allowing them to focus on strategic initiatives.

Additionally, the 3Com 7000 is designed for high performance. It supports extensive bandwidth and low-latency communications, making it ideal for high-demand applications. The ability to handle multiple simultaneous connections without compromising speed makes it an excellent choice for enterprises that rely on real-time data processing.

In summary, the 3Com 7000 is a sophisticated networking solution characterized by its modularity, advanced routing capabilities, robust security features, user-friendly management, and high performance. These attributes make it a compelling choice for enterprises looking to enhance their networking infrastructure for a competitive edge.
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