Technical Information
4–17
Table 4–6 (Cont): Cable Specifications
Item
Value
Alternate Multimode Fiber Interface Cable:
100/140
50/125
Cable length
2 km (6561 ft) maximum
2 km (6561 ft) maximum
Nominal core diameter
100
µ
m*
±
4.0
µ
m
50
µ
m*
±
3.0
µ
m
Cladding diameter
140
µ
m*
±
6.0
µ
m
125
µ
m*
±
2.0
µ
m
Optical wavelength
1300 nm
1300 nm
Numerical aperture
0.290
±
0.015
0.200
±
0.015
Modal bandwidth minimum
500 MHz
•
km @ 1300 nm
500 MHz
•
km @ 1300 nm
Power budget for FDDI
11.0 dB
6.0 dB
Maximum distance
1.6 km (.96 mi)
2 km (1.2 mi)
(*Power budget contingent on core and cladding tolerances)
Recommended Single-mode Fiber Interface Cable:
Cable length
40 km (24.8 miles) maximum
Mode field diameter
8.2
µ
m to 10.5
µ
m
Cladding diameter
125
µ
m (+ 2.0
µ
m)
Fiber cladding noncircularity
2% maximum
Core to cladding concentricity error
1
µ
m maximum
Nominal operating wavelength
1300 nm
Fiber cutoff wavelength
1270 nm maximum
Zero dispersion wavelength
1300 to 1322 nm
Zero dispersion slope
0.095 ps/(nm
2
km) maximum
Optical power attenuation
≤
0.40 dB per km at 1310 nm
Minimum power budget
22 dB at 1300 nm
Minimum required loss
12 dB at 1300 nm
Fiber optic connector types
Approved FC/PC plug types
