Rou ter

is a device that receives data and routes it based on decisions made concerning the most desirable path.

Rou ting

is the process that selects the path taken by packets as they traverse the network between nodes.

Routing algorithm

is the precise specification of the procedure used by the nodes to determine which of several possible paths through the network will be taken by a packet.

RS-232C

(often called simply RS-232) is an EIA standard defining a physical and electrical interface for DCE/DTE connections.

RS-422

is an EIA standard that operates in conjunction with RS-499 to specify electrical char- acteristics for balanced circuits (circuits with their own ground leads).

RS-449

is an EIA standard defining a physical and electrical interface for DCE/DTE connec- tions. It has more signals than RS-232, providing such features as diagnostic and bal- anced circuits.

S

SAP

stands for “Service Advertising Protocol” or “Service Access Point.” Service Adver- tising Protocol allows routers and servers to exchange internetwork service infor- mation; e.g., locations and availability of file and print servers (which connect to the network at Service Access Points.

SDLC

stands for “synchronous data link control,” IBM's version of CCITT's HDLC (high- level data link control) bit-oriented protocol.

Segmentation

is the same as Fragmentation.

SLT

stands for Single Line Telephone. When configured for this option, a voice/FAX module operates in loop start mode and provides the loop to the attached device.

SNA

stands for IBM's “Systems Network Architecture.”

Spanning Tree Algorithm

is a method employed in bridging that avoids closed loops in the data path by deter- mining the bridge with the lowest “path cost,” which is the cost of transmitting a frame onto the LAN.

Glossary

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Cabletron Systems 1800 manual Is the same as Fragmentation

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.