Extreme Networks Alpine 3802, Руководство по оборудованию

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Mini-GBIC Type and Hardware/Software Support
Extreme Networks Consolidated Hardware Guide 21
Table 4 describes the specifications for the SX mini-GBIC interface, Table 5 describes the specifications
for the LX mini-GBIC interface, and Table 6 describes the specifications for the ZX mini-GBIC interface.
Total optical system budget for the SX mini-GBIC is 11.5 dB. Extreme Networks recommends that 3 dB
of the total budget be reserved for losses induced by cable splices/connectors and operating margin.
While 8.5 dB 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 dB. 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 dB 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
Parameter Minimum Typical Maximum
Transceiver
Optical output power -9.5 dBm -4 dBm
Center wavelength 830 nm 850 nm 860 nm
Receiver
Optical input power sensitivity -21 dBm
Optical input power maximum -4 dBm
Operating wavelength 830 nm 860 nm
General
Total system budget 11.5 dB
Table 5: LX mini-GBIC specifications
Parameter Minimum Typical Maximum
Transceiver
Optical output power -9.5 dBm -3 dBm
Center wavelength 1275 nm 1310 nm 1355 nm
Receiver
Optical input power sensitivity -23 dBm
Optical input power maximum -3 dBm
Operating wavelength 1270 nm 1355 nm
General
Total system budget 13.5 dB