112APPENDIX D: CABLING REQUIREMENTS

Multi-mode Fiber The MMF-PMD standards define the requirements for an ATM cable plant Standards to support an interstation distance of up to 2 kilometers (1.25 miles) of

multi-mode fiber. The cable plant includes all fiber optic components between any two communicating ATM devices and their associated “station-to-network” connectors at each end.

To determine whether the cable plant complies with the MMF-PMD standard, do the following:

1Compare the specifications of the fiber you are using to standard specifications, as described in Table 25 and Table 26.

2If unlike fibers are mated in the cable plant, calculate insertion losses to see whether they exceed the maximum attenuation value allowed for a link, as described in Table 27 and Table 28.

3Verify that the fiber's modal bandwidth is within an acceptable range for the length of the link, as described on page 115.

The following sections describe each of these steps and give examples.

Comparing Fiber to Specifications

Compare the specifications of the fiber you are using to those in the following tables. If the fiber does not meet the specifications, use a different fiber or contact 3Com's Technical Support.

The fiber you use must meet the specifications listed in Table 25, which describes the standard set forth in MMF-PMD. Table 26 describes 62.5/125 cable, commonly sold as “ATM Spec,” which meets all the requirements of the MMF-PMD standard.

Table 25 Standard Multi-mode Fiber Specification

Specification

Description

 

 

Core

62.5 µm diameter

Cladding

125

µm diameter nominal

 

122

µm minimum

 

128

µm maximum

Numerical aperture

0.275

Maximum attenuation

11 dB* (1dB allowed for reflection and

 

dispersion penalties.)

Modal bandwidth

500

MHz. km

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3Com 7000 manual Comparing Fiber to Specifications, Specification Description
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7000 specifications

The 3Com 7000 is a robust and versatile networking solution designed to meet the demands of enterprise environments. Renowned for its reliability and scalability, the 3Com 7000 is highly suitable for organizations requiring efficient data handling and enhanced network performance. This multi-layer switching platform integrates advanced technologies, making it a preferred choice for modern businesses.

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In summary, the 3Com 7000 is a sophisticated networking solution characterized by its modularity, advanced routing capabilities, robust security features, user-friendly management, and high performance. These attributes make it a compelling choice for enterprises looking to enhance their networking infrastructure for a competitive edge.
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