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Specifications of Brocade Gigabit Optics

SX (802.3z)

Parameter Min Typ Max Units Notes
Transmitter Optical Characteristics
Optical Power -9.5 -6.5 0 dBm Average Power
Extinction Ratio 9 - dB
Center Wavelength 830 850 860 nm
Spectral Width - - 0.85 nm rms
Relative Intensity Noise - - -117 dBm/Hz
Optical Rise/Fall Time - - 210 ps 20% - 80%
Receiver Optical Characteristics
Optical Sensitivity -17 - 0 dBm
Wavelength 770 780 860 nm
Signal Detect Assert - -17 - dBm low-to-high transition
Signal Detect Deassert - -21 - dBm high-to-low transition
Signal Hysteresis - 3 - dB

LX (802.3z)

Parameter Min Typ Max Units Notes
Transmitter Optical Characteristics
Optical Power: 62.5µm MMF -11.5 -3 dBm
Optical Power: 50µm MMF -11.5 -3 dBm
Optical Power: 9µm SMF -11 -3 dBm
Extinction Ratio 9 - dB
Center Wavelength 1270 1310 1360 nm
Spectral Width - - 4 nm rms
Relative Intensity Noise - - -116 dBm/Hz
Receiver Optical Characteristics
Optical Power Minimum -20 - -3 dBm
Return Loss 12 - - dB
Signal Detect Assert - - -20 dBm Avg.
Signal Detect Deassert -30 - - dBm Avg.
Signal Hysteresis 1.5 - - dB

1000Base-LHA (Brocade Proprietary)

Parameter Min Typical Max Units Notes
Transmitter Optical Characteristics
Optical Power 0 - 3 dBm
Extinction Ratio 9 - - dB
Center Wavelength 1480 1550 1580 nm
Spectral Width - - 0.2 nm
Random Jitter - - 0.1 ns (p-p)
Duty Cycle Distortion - - 0.1 ns (p-p)
Data Dependent Jitter - - 0.1 ns (p-p)
Receiver Optical Characteristics
Average Sensitivity -21 - - dBm
Average Max Input Power - - -3 dBm
Signal Detect Assert -29 - -20 dBm
Signal Detect Deassert -31 - - dBm
Signal Hysteresis 2 - - dB
Data Dependent Jitter - - 0.1 ns
Duty Cycle Distortion - - 0.1 ns (p-p)

For LHA, the total optical power budget for all components, connectors, fiber, splices, etc. is 21dB minimum. Using 3dB for connectors and margin, you can calculate the distance supported. If the allocation for connectors and splices needs to be increased, then the distance will correspondingly be reduced. LH is intended for use with .23dB/km single mode fiber and hence, is considered to be a 70km transceiver.

Cable Attenuation Distance
.3dB/km 18/.3 = 60 km
.25dB/km 18/.25 = 72 km
.23dB/km 18/.23 = 78 km
.2 dB/km 18/.2 = 90 km

1000Base-LHB (Brocade Proprietary)

Parameter Min Typical Max Units Notes
Transmitter Optical Characteristics
Optical Power 2.5 - 5 dBm
Extinction Ratio 9 - - dB
Center Wavelength 1480 1550 1580 nm
Spectral Width - - 0.2 nm
Random Jitter - - 0.1 ns (p-p)
Duty Cycle Distortion - - 0.1 ns (p-p)
Data Dependent Jitter - - 0.1 ns (p-p)
Receiver Optical Characteristics
Average Sensitivity -27 - - dBm
Average Max Input Power - - -3 dBm
Signal Detect Assert -29 - - dBm
Signal Detect Deassert -31 - -20 dBm
Signal Hysteresis 2 - - dB
Data Dependent Jitter - - 0.1 ns (p-p)
Duty Cycle Distortion - - 0.1 ns (p-p)

For LHB, the total optical power budget for all components, connectors, fiber, splices, etc. is 29 dB minimum. Using 3dB for connectors and margin, you can calculate the distance supported. If the allocation for connectors and splices needs to be increased, then the distance will correspondingly be decreased.

Cable Attenuation Distance
.3 dB/km 26/.3 = 86 km
.25 dB/km 26/.25 = 104 km
.23 dB/km 26/.23 = 113 km
.2 dB/km 26/.2 = 130 km

Notes:
dBm - Decibel (Referenced to Milliwatts)
dB - Decibel
ns - Nanosecond
(p-p) - Point to point

Specifications of Mini-GBIC Gigabit Optics used in Brocade Products

Brocade suppliers of mini-GBICs are the following:

  • LC SX - Finisar or E20
  • MTRJ SX - AMP

Brocade does not "require" a mode conditioning cable, but recommends that users of MMF with LX be prepared to use one if necessary.