INTRODUCTION

1.2GETTING HELP

If you need additional support related to the Cabletron Systems NB20E or NB25E Two Port Ethernet Bridge, or if you have any questions, comments or suggestions related to this manual, feel free to contact Cabletron Systems' Technical Support at:

Cabletron Systems Inc.

P.O. Box 6257

E. Rochester, NH 03867-6257

Phone: (603) 332-9400

1.3THE NB20E AND NB25E TWO PORT ETHERNET BRIDGE

With the Cabletron Systems NB20E or NB25E Two Port Ethernet Bridge, you can dramatically increase the performance of two 10 Mbit per second Ethernet networks efficiently and economically, regardless of the media type. The bridges are designed to increase the efficiency of bandwidth use across a LAN by building a list of local node addresses as it learns which nodes are located on each side of the bridge. This list is called the Source Address Table. The bridge uses the Source Address Table to determine which data packets should be allowed to cross the bridge, keeping local traffic local.

The NB20E Bridge uses a software filter database to check destination addresses against its Source Address Table. The NB25E Bridge uses a higher performance hardware filter database. Both bridges are equipped with a feature called Aging Time, that continually makes space for new entries into the Source Address Table by deleting addresses that are not frequently used.

The NB20E and NB25E are designed to function in multiple-bridge environment. As IEEE 802.1 compliant bridging units, the bridges incorporate a Spanning Tree Algorithm to detect potential data loops in the network. Spanning Tree Algorithm is a hierarchy (or tree) of priorities that is established between bridges.

The NB20E and NB25E can be controlled and managed by Cabletron Systems' Remote LANVIEW™ - Network Control Management for the Cabletron Systems' NB20E and NB25E. Remote LANVIEW provides the most complete network management system for Ethernet networks in the industry today. With Remote LANVIEW, a bridge can be managed

1-2

Page 7 Page 9
Page 8
Image 8
Cabletron Systems NB25 E user manual Getting Help, NB20E and NB25E TWO Port Ethernet Bridge
Page 7 Page 9

NB25 E, NB20E specifications

Cabletron Systems, renowned for its innovative networking solutions in the late 20th century, introduced the NB20E and NB25E series, which made a significant impact in the realm of network management and reliability. These devices were tailored for businesses seeking to enhance their network infrastructure with efficiency and reliability.

The NB20E is known for its robust performance in medium-sized network environments. It operates with an architecture that allows for seamless integration into existing networks, providing essential features that cater to both versatility and scalability. One of its standout functionalities is the support for multiple protocols, enabling organizations to harness various networking standards without the need for extensive alterations to their current setups.

On the other hand, the NB25E extends these capabilities further, offering enhanced throughput and a more comprehensive range of networking options. This makes it particularly suitable for larger businesses with growing networking demands. The utilization of advanced technologies, such as its embedded intelligence, ensures that the NB25E can efficiently manage and direct network traffic, thus minimizing latency and maintaining optimal performance even during peak usage times.

Both models provide essential characteristics such as a modular design, allowing for easy upgrades and maintenance. This modularity not only prolongs the lifespan of the devices but also provides flexibility for future expansions or modifications as business needs evolve. The systems support various interfaces, catering to diverse environments and ensuring easy connectivity to other networking equipment.

Security is a paramount concern in today’s interconnected world, and Cabletron Systems addressed this in the NB20E and NB25E series. The devices are equipped with advanced security features that protect against unauthorized access and ensure data integrity, providing peace of mind for organizations relying on critical data transmissions.

In addition to their technical advantages, both models offer user-friendly management software, making monitoring and control straightforward even for those with limited networking expertise. This ease of use ensures that companies can leverage their investment fully without requiring extensive training or resources.

In summary, the Cabletron Systems NB20E and NB25E series represent a significant leap in networking technology during their era. With advanced features, modular capabilities, and a commitment to security, these devices remain a noteworthy consideration for businesses looking to enhance their networks and prepare for future growth.
Top Page Image Contents