Chapter 3: Installation Requirements and Specifications

3.1.1HubSTACK Interconnect Cable Requirements

Attach the SEHI to modules in the stack with the SEHI HubSTACK Interconnect cable available only from Cabletron Systems. Refer to Chapter 1 for cable part numbers. The cable attaches to the SEHI rear panel bus port.

The rear panel of the SEHI has an Interconnect Bus Out port (male connector) to stack SEH non-intelligent hubs together. Stack up to four SEH hubs together with one SEHI.

3.1.210BASE-FL Fiber Optic Network Requirements

Table 3-1 shows Multimode Fiber Optic Cable specifications for the SEHI-22FL.

Table 3-1 Multimode Fiber Optic Cable Specifications

Cable Type

Attenuation

Maximum Cable Length

 

 

 

 

 

 

50/125 m

13.0 dB or less

Maximum fiber optic cable length is 2

 

 

km (2187.2 yds). However, IEEE 802.3

62.5/125 m

16.0 dB or less

specifications allow for a maximum of 1

 

 

100/140 m

19.0 dB or less

km (1093.6 yds).

 

 

 

Attenuation

Test the fiber optic cable with a fiber optic attenuation test set adjusted for an 850 nm wavelength. This test verifies that the signal loss in a cable is within an acceptable level. Table 3-1 shows the attenuation for each Multimode cable type.

Fiber Optic Budget and Propagation Delay

Determine the maximum fiber optic cable length by calculating the fiber optic budget delay and total network propagation before the fiber optic cable runs are incorporated into a network design.

Fiber optic budget is the combination of the optical loss due to the fiber optic cable, in-line splices, and fiber optic connectors.

Propagation delay is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the network is 25.6 s (51.2 s roundtrip). If the total propagation delay between any two nodes on the network exceeds 25.6 s, then use bridges.

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SEHI User’s Guide

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Cabletron Systems SEHI-22FL manual HubSTACK Interconnect Cable Requirements, 2 10BASE-FL Fiber Optic Network Requirements

SEHI-22FL specifications

Cabletron Systems SEHI-22FL is a robust and reliable networking device designed for use in high-performance telecommunications and data communication environments. Known for its versatility, the SEHI-22FL serves as a key component in the infrastructure of businesses that require fast, efficient, and secure data transmission.

One of the main features of the SEHI-22FL is its multi-layer switching capabilities, which enable it to operate at both Layer 2 and Layer 3 of the OSI model. This means that it can handle data switching and routing, thus providing flexibility in network design. It incorporates advanced switching technologies that facilitate high-speed data transfers, making it an ideal choice for networks that demand low latency and high throughput.

The SEHI-22FL is equipped with multiple Ethernet ports that support different speeds, including 10/100Mbps and Gigabit Ethernet options, allowing users to connect various devices seamlessly. The device supports both copper and fiber optics connections, thus ensuring adaptability to various networking scenarios. This flexibility helps network administrators to optimize network performance according to the specific requirements of their organization.

For security, the SEHI-22FL comes with built-in features that include VLAN support, which allows for network segmentation. This functionality adds an extra layer of security by isolating different parts of the network, thereby minimizing the risk of unauthorized access. Additionally, it supports features such as port security and MAC address filtering, which further enhance the security protocols of the network.

The management of the SEHI-22FL is simplified through an intuitive user interface that provides comprehensive monitoring and configuration options. Network administrators can easily access important metrics and performance statistics, thus enabling quick resolution of any issues that may arise. This is complemented by support for SNMP (Simple Network Management Protocol), allowing for remote management and monitoring capabilities.

The device is designed with reliability in mind, exhibiting features such as redundant power supplies and cooling systems to ensure uninterrupted operation even in critical environments. This makes the SEHI-22FL a trustworthy choice for businesses that cannot afford downtime.

In conclusion, Cabletron Systems SEHI-22FL stands out as a versatile and powerful networking device equipped with advanced features, robust security protocols, and reliable performance. Its ability to adapt to different networking environments makes it a valuable asset for organizations looking to enhance their telecommunications infrastructure.