ATM Cabling E-5

Table E-1Standard 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

Maximum distance between nodes

2 km

Output power (from transmitter)

19 dB minimum

 

14 dB maximum

Receive power

30 dB minimum sensitivity

 

14 dB maximum sensitivity

 

 

 

*Maximum attenuation includes cable attenuation and the loss induced by other components such as connectors, splices, and the mating of unlike fiber types. Although some 2 km cable plants have a total attenuation of less than 11.0 dB, the 2 km interstation distance must be maintained to comply with modal bandwidth requirements.

Table E-2Alternate Multi-mode Fiber Types

Core (µ m)

Cladding (µ m)

Numerical Aperture

 

 

 

50

125

0.20

50

125

0.22

85

125

0.28

100

140

0.29

 

 

 

Calculating Insertion If unlike fibers are mated in the cable plant, calculate insertion losses to Losses for Unlike be certain that the cable plant does not exceed the maximum attenuation

Fibers value listed in Table E-1. To calculate the insertion loss, consider the types of fiber in the cable plant and the connectors or splices used to join them. Compare the result to the maximum attenuation value listed in Table E-1. If the result is greater than the value in the table, use only like fibers in the cable plant.

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3Com DUA3700-0BAA04 manual Specification Description

DUA3700-0BAA04 specifications

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