Using the SEHI Hub View

For error type descriptions, see Checking Statistics, page 2-15.

Frame Sizes

Displays a percentage for each active port that represents what portion of that port’s traffic is of a specific size, measured in bytes. You can display any one of the following frame sizes:

Runts (packets with fewer than 64 bytes)

64-127

128-255

256-511

512-1023

1024-1518

Giants (packets with more than 1518 bytes)

NOTE

For the statistical port display form options listed above, three dashes (- - -) will display for all inactive ports; any active (green) port will display a numeric value, even if it’s 0.0000.

Port Type

Provides the following administrative information about the port:

Admin/Link Status indicates the connection status of the port:

-ON indicates that the port has a valid link signal or does not support a link signal.

-OFF indicates that the port has been turned off through management action.

-NLK (No Link) indicates that the port does not have a link to a device at the other end of the cable, or that there is no cable attached.

-SEG (Segmented) indicates that the port has been segmented by the repeater due to an excessive collision level.

NOTE

Because BNC thin coax, AUI, and transceiver ports do not support the link feature, the displayed Admin/Link status for those ports may be misleading: for example, a BNC port will display as segmented when, in fact, there is no cable or terminator attached or the cable has been disconnected; an AUI or transceiver port will display as on (with a valid link signal) even when no cable is attached. Be sure to keep these anomalies in mind when troubleshooting a device so equipped.

Admin Status displays either ON or OFF, an indication of whether management has the port enabled or disabled. A port can be ON but not operational; for example, under the Admin display, ports that are segmented or not linked are shown as ON.

Monitoring Hub Performance

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Cabletron Systems SEHI-22/24, SEHI-32/34 manual Frame Sizes, Port Type

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.