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Note: A mode-conditioning patch cord (product number 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, which is accomplished by using
the mode-conditioning patch cord. At the output of the patch cord, the Cisco 1000BASE-LX/LH GBIC is compliant
with the IEEE 802.3z standard for 1000BASE-LX.
Standards
Compatible with GBIC standard as specified in IEEE 802.3z
Compliant with GBIC Specification Revision 5.4
Table 1 Cisco GBIC Port Cabling Specifications
GBIC
Wavelength
(nm)
Fiber
type
Coresize
(micron)
Modal
bandwidth
(MHz/km)
Cable
distance
Cisco
1000BASE-SX
850 MMF 62.5
62.5
50.0
50.0
160
200
400
500
722 ft (220 m)
902 ft (275 m)
1640 ft (500 m)
1804 ft (550 m)
Cisco
1000BASE-
LX/LH
1300 MMF
1
SMF
62.5
50.0
50.0
9/10
500
400
500
N/A
1804 ft (550 m)
1804 ft (550 m)
1804 ft (550 m)
6.2 miles (10 km)
Cisco
1000BASE-ZX
1550 SMF 9/10 N/A 43.4 to 62 miles
(70 to 100 km)
2
1. Mode-conditioning patch cord (CAB-GELX-625 or equivalent) is required. Using an ordinary patch cord with MMF, 1000BASE-LX/LH GBICs, and a short link
distance (10s of meters) can cause transceiver saturation resulting in an elevated bit error rate (BER). In addition, when using the Cisco 1000BASE-LX/LH GBIC
with 62.5-microndiameter MMF,you mustinstall amode-conditioning patchcord betweenthe GBICand theMMF cableon boththe transmitand receiveends of
the link. The mode-conditioning patch cord is required for link distances greater than 984 feet (300 m).
2. Cisco 1000BASE-ZX GBIC can reach up to 62 miles (100 km) by using dispersion shifted SMF or low-attenuation SMF; the distance depends on fiber quality,
number of splices, and connectors.
Table 2 Fiber Loss Budgets for 1000BASE-SX, 1000BASE-LX, and 1000BASE-ZX
Device Type Transmit (dBm) Receive (dBm)
Max Min Max Min
WS-G5484 1000BASE-SX –4 –9.5 0 –17
WS-G5486 1000BASE-LX/LH –3 –9.5 –3 –19
WS-G5487 1000BASE-ZX 5 0 –3 –23
1
1. TheWS-G54871000BASE-ZXGBICprovides aminimumopticalpowerbudgetof23dB.Todeterminethesupportedlinkdistanceyoushouldmeasureyourcable
plant with anoptical loss testset toverify that theoptical loss ofthe cable plant(including connectorsand splices) isless than orequal to thisfigure. The optical
loss measurement must be performed with a 1550-nanometer light source.