06-19-2018 08:40 AM
Hi, the description of SFP 8G-ER-Dxxx-BR1 appears
SFP+, 8/4/2/1 Gbps FC/FICON, DWDM, SM, DDM, 14dB, 40km
What is the interpretation of value 14dB?
for other hand in the specifications of the SFP in Receiver characteristics there are three parameters
Receiver Sensitivity @ 10.3GBps (RX_SENS) -16 dBm
Loss of Signal-Asserted (PLOS_A) -28 dBm (min)
Loss of Signal-Deasserted (PLOS_D) -16 dBm (max)
the same question, What's the interpretation of these values?
thanks in advanced
06-26-2018 02:06 PM
dBm is a reference of the ratio of power to a standard mW. The 14dB is what power the SFP will deliver at the output port, in reference to 1 mW. The recieve side will be working with a power level of -16dB or higher.
Loss of Signal asserted means that when the recieve level falls below that value, the SFP will report to the FOS that a "loss of signal" has been reached. When the signal rises above -16dB, the SFP will not report to the FOS that a loss of signal has occured.