IPL

stands for “initial program load,” which is the loading into a node of the operating software on power-on or re-boot.

IPX

stands for “Internetwork Packet Exchange,” which is a Novell NetWare connec- tionless protocol that defines internetwork and intranode addressing schemes.

L

LAN

stands for “local area network,” which is a network operating over short distances at high speeds.

LCN

stands for “logical channel number,” which is used as an identifier for a virtual circuit between a DTE and a DCE.

Level 2

is the link layer in the ISO (International Standards Organization) 7-layer OSI (Open Systems Interconnect) reference model.

Level 3

is the packet layer in the OSI reference model.

Line Interface Card

is a “daughter” card mounted in a SmartSwitch 1800, and containing the components that support the two Voice ports.

LLC

stands for “logical link control,” which is the third layer in the three-layer ISO LAN protocol hierarchy. (The first two layers are Physical and MAC; MAC is described in this glossary.) LLC is responsible for addressing and data link control.

LLC2

is a type of LLC that requires establishment of a connection before information can be exchanged. (The other type of LLC is LLC1, which does not require a connection.)

Logical Channel

is a logical link between node and subscriber, on which calls are sent or received. The physical line between devices may have a number of logical channels (also called LCNs).

Logical DCE/DTE

see “DCE” and “DTE.”

LPDU

stands for “LLC protocol data unit,” which is the unit of information exchanged between link stations in different nodes. The LPDU consists of destination service access point (see “DSAP”) and source service access point (see “SSAP”) address fields, a control field, and (optionally) information fields.

glo-6

SmartSwitch 1800 4. 0 User Guide, Rev 01

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Cabletron Systems 1800 manual Is the packet layer in the OSI reference model
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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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