Chapter 1

Introduction to SPMA

for the SEHI-22/24 and SEHI-32/34

How to use the SEHI User’s Guide; manual conventions; contacting Cabletron Technical Support; SEHI firmware versions supported by SPMA

The SEHI-22/24 and SEHI-32/34 are intelligent repeating hubs that provide front panel ports for network connections and a rear-panel HUBStack Interconnect Bus port for stackable connections. Both devices fully conform to the IEEE 802.3 Repeater, AUI, and 10BASE-T specifications, and provide the flexibility to connect networks using a variety of media via RJ45 twisted pair, SMA and ST fiber optic, thin coax, and AUI EPIM modules. All of the models are functionally identical; the only difference among them is the configuration of front panel ports: the SEHI-22 has 12 built-in RJ45 ports and one slot for an EPIM module; the SEHI-24 has 24 built-in RJ45 ports and two EPIM slots; the SEHI-32 has one 50-pin Champ connector providing 12 twisted pair segments and one EPIM slot; and the SEHI- 34 has two 50-pin Champ connectors providing 24 twisted pair segments and two EPIM slots. You can stack as many as four of Cabletron’s SEH non-intelligent hubs with one SEHI and the entire stack is counted as only one repeater hop. All SEHI models will transmit re-timed data packets, regenerate preamble, extend fragments, arbitrate collisions, and automatically partition problem segments.

NOTE

Since the devices covered by this User’s Guide are functionally identical, they will be jointly referred to throughout the text as the SEHI. Likewise, since the only differences in the windows for each device will be the device name (SEHI-22, SEHI-24, etc.) and the number of ports displayed, only the SEHI-24 windows will be shown.

Using the SEHI User’s Guide

Your SPECTRUM Portable Management Application (SPMA) for the SEHI-22/24 and SEHI-32/34 consists of a number of different applications, each of which provides a portion of the overall management functionality. Each of these

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Cabletron Systems manual Introduction to Spma For the SEHI-22/24 and SEHI-32/34, Using the Sehi User’s Guide
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SEHI-22/24, SEHI-32/34 specifications

Cabletron Systems was a notable player in the networking hardware market during the rise of local area networks (LANs) in the late 20th century. Among its innovative products were the SEHI-22/24 and SEHI-32/34 modules, which were designed to enhance network capabilities in enterprise environments.

The SEHI-22/24 and SEHI-32/34 were versatile high-performance Ethernet switch modules that offered significant advantages in network management and connectivity. These modules were designed to work with Cabletron's modular switching and routing architecture, allowing for scalable solutions tailored to specific network demands. A key feature of the SEHI series was its support for a range of Ethernet standards, ensuring compatibility with diverse networking environments.

One notable characteristic of the SEHI-22/24 was its ability to support both 10Base-T and 100Base-TX Ethernet technologies. This dual support enabled organizations to leverage existing 10 Mbps infrastructure while facilitating upgrades to 100 Mbps speeds without needing a complete overhaul of the network. Similarly, the SEHI-32/34 offered even greater connectivity options, accommodating more users and devices while maintaining high throughput and low latency.

In terms of management features, the SEHI series was equipped with extensive traffic management capabilities, including Quality of Service (QoS) features that prioritized bandwidth for critical applications. This ensured that essential services such as voice over IP (VoIP) and video conferencing could function optimally, even during heavy network loads.

Furthermore, both modules featured advanced diagnostics and monitoring tools that provided network administrators with critical insights into traffic patterns and potential bottlenecks. This functionality was essential for maintaining network health and optimizing performance, especially in dynamic business environments.

Security also played a crucial role in the design of the SEHI-22/24 and SEHI-32/34. The modules incorporated support for various authentication methods and access controls, ensuring that sensitive data remained protected within the corporate network.

In summary, Cabletron Systems’ SEHI-22/24 and SEHI-32/34 offered significant advancements in Ethernet switching technology, allowing organizations to build robust, scalable, and secure networks. With their impressive features, compatibility, and capacity for management and security, these modules were instrumental in shaping reliable networking solutions for enterprises navigating the rapidly evolving digital landscape.
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