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Chapter 5: Specifications
5.4
CABLE 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
Core diameter:
Cladding diameter:
Cable attenuation:
Single Mode Fiber
Core diameter:
Cladding diameter:
Cable attenuation:
5.4.1
Multimode Fiber Optic Cable Length
The PMD FDDI standard specifies the following:
Maximum total cable length:
Maximum multimode cable length
between adjacent nodes:
5.4.2
Single Mode Fiber Optic Cable Length
The SMF-PMD FDDI standard specifies the following:
Maximum total cable length:
Single mode cable length
between adjacent nodes:
5-6
62.5 µm nominal
128.0 µm maximum
122.0 µm minimum
ð 2.5 dB/km typical
8.7 µm +/- 0.5 µm
127.0 µm maximum
ð 0.5 dB/km typical
100 km (62 miles) — dual ring
200 km (124 miles) — wrapped
2 km (1.2 miles)
100 km (62 miles) — dual ring
200 km (124 miles) — wrapped
40 km (24 miles) maximum
25 km (15 miles) typical
DELHF-UA User's Guide
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