Chapter 8

Configuring X.25

Introduction

A SmartSwitch 1800 X.25 port can connect to an X.25 DTE or an X.25 network. This allows the node to transmit X.25 traffic, as well as IP and IPX (encapsulated per RFC 1356), and SNA (per QLLC).

X.25 support in the SmartSwitch 1800 includes:

●Full compliance with CCITT Recommendation X.25

●Line speeds up to 2.048 Mbps

●Full X.121 addressing capability

●Address translation

●RFC 1356 for IP over X.25

●RFC 1490 encapsulation (HDLC)

The SmartSwitch 1800 also supports logical X.25 ports, which allow multiple legacy protocols (SDLC, async, bisync, etc.) to be encapsulated via X.25 and transmitted over a single physical frame relay port. A SmartSwitch 1800 can contain up to 56 logical ports, all on one physical port or spread over several physical ports.

Some things to know about logical ports are:

●Encapsulation can be via either T1.617 Annex G or T1.617 RFC1490. You should know the pros and cons of using each. The explanation of "Encapsulation Method" on page 8-16offers some help.

●Both level-2 and level-3 windows can be configured. (Configuration and oper- ation is the same for either encapsulation method.)

Required Configuration

To run a physical port as X.25, make sure the following are properly configured:

●Node parameters (Chapter 4). This is general configuration that must be done no matter which protocols will be run in the node.

●Loaded protocols (Chapter 5): X.25 and any others that will be transmitted over the X.25 link.

●X.25 port(s) that will connect to the user device(s) and network. See page 8-2.

●SVC Subscriber ID(s) (page 8-21), which identifiy user devices to each other and the SmartSwitch 1800.

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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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