Network Cable Requirements

-Network propagation delay is the amount of time it takes a packet

to travel from the sending device to the receiving device. Total propagation delay for the entire network must not exceed 25.6 s in one direction (51.2 s round trip). If the total propagation delay exceeds 25.6 s, you must use bridges.

Length - If you meet all system budgets, the maximum single mode fiber optic cable length can reach 5 km (3.1 miles) with bridges at each segment end. However, IEEE 802.3 FOIRL specifications specify a maximum of 1 km (1093.6 yards).

C.1.4 Thin-Net Network

When connecting a thin-net (coaxial) segment to an EPIM-C, ensure your network meets the following requirements:

Cable Type - Use only 50 ohm RG58A/U type coaxial cable for thin-net cable segments.

Length - The thin-net segment must not exceed 185 meters.

Terminators - Terminate each end of a thin-net segment.

Connectors - You can use up to 29 tee-connectors throughout the length of the cable segment for host connections.

-If you use an excessive number of barrel connectors within the cable segment (e.g., finished wall plates with BNC feed-throughs), you may need to reduce the number of host connections. For special network design, contact Cabletron Systems Technical Support.

Connecting a thin-net segment to earth ground at more than one point could produce dangerous ground currents.

-Grounding - For safety, ground only one end of a thin-net segment. Do NOT connect EPIM BNC ports to earth ground.

NBR-SERIES Installation Guide

Page C-5

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Cabletron Systems NBR-220, NBR-420, NBR-620 manual Thin-Net Network

NBR-620, NBR-220, NBR-420 specifications

Cabletron Systems, a well-known name in the networking field, has designed a range of network interface devices including the NBR-620, NBR-220, and NBR-420 models. These devices have become essential components for businesses looking to enhance their network performance and reliability.

The NBR-620, for instance, is a high-performance network bridge/router that specializes in managing network traffic efficiently. It offers a robust set of features such as multiple Ethernet ports, which can support various data rates, including 10/100/1000 Mbps, making it ideal for both small and large enterprises. The NBR-620 supports advanced routing protocols like OSPF and RIP, which optimize data path selection and ensure effective communication across different network segments. Moreover, its built-in firewall capabilities provide an additional layer of security, safeguarding sensitive data from potential threats and unauthorized access.

The NBR-220, on the other hand, is designed for cost-effective solutions without compromising on essential functionalities. This device supports simple plug-and-play installation, making it user-friendly for organizations that may not have an extensive IT infrastructure. The NBR-220 includes features such as VLAN support, allowing for network segmentation and increased security. Its scalability means that it can grow alongside an organization's needs, accommodating future expansions efficiently. The device's ability to support multiple network topologies ensures versatility in deployment, catering to various business requirements.

Finally, the NBR-420 is a versatile networking solution that combines the best elements of the previous models but with enhanced features suitable for demanding enterprise environments. It includes advanced quality of service (QoS) capabilities, ensuring that critical applications receive the bandwidth they require for optimal performance. With support for IPv6, the NBR-420 prepares businesses for the future of networking as the world transitions more towards this next-generation internet protocol. Additionally, its built-in diagnostics tools facilitate easy monitoring and management of network performance.

In summary, Cabletron Systems' NBR-620, NBR-220, and NBR-420 offer diverse solutions tailored for modern networking needs. Each model encompasses unique features and technologies that cater to various business sizes and requirements, focusing on performance, scalability, and security. As businesses continue to evolve in a digital-first world, these devices play a crucial role in facilitating seamless network operations.