Extreme 3802 Hardwarehandbuch

Extreme Networks Consolidated Hardware Guide

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Table 4 describes the specifications for the SX mini-GBIC interface, and Table 5 describes the 
specifications for the LX mini-GBIC interface.

Total optical system budget for the SX mini-GBIC is 11.5 dBm. Extreme Networks recommends that 3 
dBm of the total budget be reserved for losses induced by cable splices/connectors and operating 
margin. While 8.5 dBm remains available for cable induced attenuation, the 1000BASE-SX standard 
specifies supported distances of 275 meters over 62.5 micron multimode fiber and 550 meters over 50 
micron multimode fiber.  There is no minimum attenuation or minimum cable length restriction.

Total optical system budget for the LX mini-GBIC is 13.5 dBm. Measure cable plant losses with a 1310 
nm light source and verify this to be within budget. When calculating the maximum distance attainable 
using optical cable with a specified loss per kilometer (for example 0.25 dB/km) Extreme Networks 
recommends that 3 dBm of the total budget be reserved for losses induced by cable splices/connectors 
and operating margin. Thus, 10.5 dBm remains available for cable induced attenuation.  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.

Table 4: SX mini-GBIC specifications

Optical output power

-9.5 dBm

-4 dBm

Center wavelength

830 nm

850 nm

860 nm

Optical input power sensitivity

-21 dBm

Optical input power maximum

-4 dBm

Operating wavelength

830 nm

860 nm

Total system budget

11.5 dBm

Table 5: LX mini-GBIC specifications

Optical output power

-9.5 dBm

-3 dBm

Center wavelength

1275 nm

1310 nm

1355 nm

Optical input power sensitivity

-23 dBm

Optical input power maximum

-3 dBm

Operating wavelength

1270 nm

1355 nm

Total system budget

13.5 dBm