What is the normal optical attenuation level for a 10 Gigabit switch

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If required an attenuator can be added to comply with this specification ** This is the maximum fiber attenuation allowed for standerd single mode fiber at 1550 nm as per IEC 60793-2. Transmit power is typically good when it is in the 6 dB range between -1 and -7 dBm. Because optical power levels range widely, the decibel-milliwatt (dBm) is used instead of a linear unit like the milliwatt (mW). The dBm scale is logarithmic, meaning a small numerical change represents a large change in actual light power. 10 Gigabit Ethernet (GbE) introduces several measure-ments not widely used before, such as optical modulation ampli-tude (OMA) and stressed eye sensitivity.

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