Measure method:
There are two common ways to measure optical signal strength in the industry: Microwatts (mW) and dBm. Different platform switches may adopt different methods. Some will choose mW, and some will choose dBm. SFP optical module signal strength usually contains two indicators, namely Tx Power and Rx Power. Tx Power represents the intensity of the optical signal sent by the SFP module; Rx Power represents the intensity of the optical signal received by the SFP module.
Contact between mW and dBm
The mW describes the optical signal strength by means of a power mode. The dBm is an abbreviation of decibel of the measured power to one millwats, and describes the optical signal power ratio in decibels. Cisco switches use dBm and Brocade switches use mW. Both can be converted to each other by the following formula:
dBm -> mW:
mW -†dBm:
EMC recommended optical signal strength range:
The maximum acceptable light attenuation range for common rates:
8Gbps maximum acceptable signal attenuation: -13.8dBm
· 4Gbps maximum acceptable signal attenuation: -15.4dBm
· 2Gbps maximum acceptable signal attenuation: -18.2dBm
Check the SFP module optical signal strength:
Cisco/Brocade SAN switches provide tools for viewing SFP module details, including SFP rate, serial number, Part Number, and receive/send direction light signal strength.
Cisco View sfp Module Optical Signal Strength Method
– show interface transceiver details
Brocade view sfp module optical signal strength method
– sfpshow
From the command output results above, it can be seen that the Cisco/Brocade has different methods for expressing the optical signal strength and both provide the current signal strength and the SFP effective optical signal strength range. As long as the current SFP module is within the valid range, it can be considered that the SFP is in normal operation.
EMC's recommendation range is smaller than the Cisco/Brocade switch's own range. The minimum signal strength is relatively high and the strongest signal strength is relatively low.
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