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5
Gigabit Interface Converter Installation Note
78-5399-03 Rev. A0
Overview
Note The mode-conditioning patch cord (CAB-GELX-625 or equivalent) is required to comply
with IEEE standards. The IEEE found that link distances could not be met with certain
types of fiber-optic cable cores. The solution is to launch light from the laser at a precise
offset from the center by using the mode-conditioning patch cord. At the output of the
patch cord, the LX/LH GBIC is compliant with the IEEE 802.3z standard for
1000BASE-LX.
Table 5 GBIC Port Cabling Specifications
GBIC
Wavelength
(nm) Fiber Type
Core Size
1
(micron)
1. The numbers given for multimode fiber-optic cable refer to the core diameter. For single-mode fiber-optic cable,
8.3 microns refers to the core diameter. The 9-micron and 10-micron values refer to the mode-field diameter (MFD), which
is the diameter of the light-carrying portion of the fiber. This area consists of the fiber core plus a small portion of the
surrounding cladding. The MFD is a function of the core diameter, the wavelength of the laser, and the refractive index
difference between the core and the cladding.
Modal
Bandwidth
(MHz/km) Cable Distance
SX
2
2. Use with MMF only.
850 MMF 62.5 160 722 feet (220 meters)
(WS-G5484) 62.5 200 902 feet (275 meters)
50.0 400 1640 feet (500 meters)
50.0 500 1804 feet (550 meters)
LX/LH 1310 MMF
3
3. When using an LX/LH GBIC with 62.5-micron diameter MMF, you must install a mode-conditioning patch cord
(CAB-GELX-625 or equivalent) between the GBIC and the MMF cable on both the transmit and receive ends of the link.
The mode-conditioning patch cord is required for link distances less than 328 feet (100 m) or greater than 984 feet (300 m).
The mode-conditioning patch cord prevents overdriving the receiver for short lengths of MMF and reduces differential
mode delay for long lengths of MMF.
62.5 500 1804 feet (550 meters)
(WS-G5486) 50.0 400 1804 feet (550 meters)
50.0 500 1804 feet (550 meters)
SMF 8.3/9/10 6.2 miles (10 km)
ZX 1550 SMF 8.3/9/10 43.5 miles (70 km)
(WS-G5487) 8 62.1 miles (100 km)
4
4. Requires dispersion-shifted single-mode fiber-optic cable.