Chapter 5: Specifications

5.4CABLE SPECIFICATIONS

The FDDI Physical Layer Medium Dependent (PMD), Twisted Pair Physical Layer Medium Dependent (TP-PMD), and Single Mode Fiber Physical Layer Medium Dependent (SMF-PMD) ANSI standards define cable requirements as follows:

Multimode Fiber

62.5 m nominal

Core diameter:

Cladding diameter:

128.0

m maximum

 

122.0

m minimum

Cable attenuation:

2.5 dB/km typical

Single Mode Fiber

8.7 m +/- 0.5 m

Core diameter:

Cladding diameter:

127.0

m maximum

Cable attenuation:

0.5 dB/km typical

5.4.1Multimode Fiber Optic Cable Length

The PMD FDDI standard specifies the following:

Maximum total cable length:

100 km (62 miles) — dual ring

 

200 km (124 miles) — wrapped

Maximum multimode cable length

 

between adjacent nodes:

2 km (1.2 miles)

5.4.2Single Mode Fiber Optic Cable Length

The SMF-PMD FDDI standard specifies the following:

Maximum total cable length:

100 km (62 miles) — dual ring

 

200 km (124 miles) — wrapped

Single mode cable length

 

between adjacent nodes:

40 km (24 miles) maximum

 

25 km (15 miles) typical

5-6

HSIM-F6 User’s Guide

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Cabletron Systems BRIM-F6 Cable Specifications, Multimode Fiber Optic Cable Length, Single Mode Fiber Optic Cable Length