HP Fiber-Optic Hub Plus User's Guide download pdf (Page 50)

Fiber-Optic Cable Requirements

Basic fiber-optic cable specifications are provided here. For more information see the HP

EtherTwist Technical Reference Guide (HP p/n 5091-3237E).

Fiber Specifications. The HP Fiber-Optic Hub Plus supports two different fiber core and

cladding sizes, 62.5/125 µm and 50/125 µm. The hub uses ST connectors.

Fiber Core/Cladding Size 62.5/125mm 50/125mm

Fiber Type Multimode Multimode

Attenuation Grade

 4.0 dB/km  4.0 dB/km

Numerical Aperture 0.275 0.20

Modal Bandwidth

 150 MHz-km  150 MHz-km

Note: Attenuation and modal bandwidth values are at 850nm wavelength for

both fiber sizes.

Length Limit. The IEEE FOIRL (fiber-optic inter-repeater link) standard limits the length of

the fiber-optic cable between two hubs to one kilometer. In most network configurations, use

the 1-km length maximum as a rule of thumb.

Thin LAN Cable Requirements

The thin coaxial cables used with the HP Fiber-Optic Hub Plus’ ThinLAN port must comply

with the IEEE 802.3 Type 10Base2 requirements. Some RG-58 A/U or RG-58 C/U cable meet

these requirements.

The maximum length of a single thin coaxial cable segment is 185 meters.

A-4 Cables and Connectors

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HP Fiber-Optic Hub Plus User's Guide Page 50