Compo site

is the input/output port of a local multiplexer, that transmits and receives the multi- plexed voice and data from a remote multiplexer.

Con centrator

is a communications device that allows a shared transmission medium to accom- modate more data sources than there are channels available.

Configuration database

see “Database.”

Congestion

is a local condition that occurs when there are too many packets to be queued in the node buffers, causing information transfer to be delayed.

D

Database

contains the files that define network configuration, subscribers, alarms and statistics.

Datagram

is the basic unit of information passed across the Internet. It is the IP equivalent of a packet.

DCE

stands for “data circuit-terminating equipment,” which provides the functions nec- essary for communication operations between the end-user device (see “DTE”) and the network. “Physical DCE” refers to the hardware configuration, and “Logical DCE” refers to the software configuration. Note that physical and logical DCE are independent of each other; however, for each, if one end of the connection is DCE, the other must be DTE, and vice versa.

Designated Bridge, Designated Port

is the bridge (and the SmartSwitch 1800 port on the bridge) on a LAN that provides the minimum-cost path to the root bridge (described later).

Dial Port

is an X.25 port connected to a dialup modem.

Dotted Decimal Notation

is the syntactic representation for a 32-bit integer consisting of four 8-bit numbers (in base 10) separated by periods. This format is used for IP addresses.

DSAP

stands for “destination service access point,” which is the address of the link service access point (LSAP) to which a link protocol data unit (LPDU) is sent.

DSU

stands for Data Service Unit, which interfaces between Data Terminal Equipment and a digital data service.

Glossary

glo-3

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Cabletron Systems 1800 manual See Database
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1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.
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