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Optical Budget Calculation
When you plan an installation using the SX SFP module, Extreme Networks recommends that 3 dB of
the total budget be reserved for losses induced by cable splices or connectors and operating margin.
There is no minimum attenuation or minimum cable length restriction.
For technical specifications for the SX and Industrial Grade SX SFP, see Technical Specifications.
LX and Industrial Grade LX SFP Modules
The LX (Part No. 10052) and Industrial Grade LX (Part No. 10052H) SFP modules provide a 1000BASE-
X optical connection using LC connectors and single-mode fiber (SMF) cable up to 10 km long.
The LX SFP module conforms to the 1000BASE-LX standard.
The LX SFP module operates at a commercial temperature range (-40C to 70C). The Industrial Grade
SX SFP module operates at a wide temperature range (-40C to 85C).
LX SFP modules are supported on the following Extreme Networks devices:
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BlackDiamond 8800 series switches
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BlackDiamond X8 switch
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BlackDiamond 10808 switch
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BlackDiamond 12800 series switches
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BlackDiamond 20800 series switches
•
Summit X150 series switches
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Summit X250e series switches
•
Summit X440 series switches
•
Summit X450 series switches
•
Summit X450a series switches
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Summit X450e series switches
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Summit X460 series switches
•
Summit X480 series switches
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Summit X650-24x switch: ports 1 through 22, VIM1 module ports
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Summit X670 series switches
•
E4G series routers (Ethernet ports)
Optical Budget Calculation
Measure cable plant losses with a 1310 nm light source and verify this to be within budget.
When you calculate the maximum distance attainable using optical cable with a specified loss per
kilometer (for example 0.25 dB/km), Extreme Networks recommends that 3 dB of the total budget be
reserved for losses induced by cable splices or connectors, and operating margin. There is no minimum
system budget or minimum cable length restriction because the maximum receive power is the same
as the maximum transmit power. There is no minimum attenuation or minimum cable length restriction.
Extreme Networks SFP and SFP+ Modules
Pluggable Hardware Installation Guide 14