Hello. I'm choosing SFP for cisco 3750-X. In datasheet for GLC-BX-U(D) min transmit power is -9 dBm, min receive power is -19.5 dB. So max insertion loss in channal is about 10.5 dB. But in this datasheet it's just 5.5 dB for GLC-BX-D and 6 dB for GLC-BX-U. In that case, what max loss is right?
The data sheet indicates "standard SMF with an operating transmission range up to 10 km." These transceivers integrate a WDM filter (~ 1dB additional loss per end) to add and remove the 1310nm and 1490nm signals on the single fiber.
Operating outside the Cisco recommended range will be an unsupported deployment.
I think they are just saying it can have any value between the range for Transmit/Receive but Max Insertion loss they are going to suspport is 5.5/6dBm.
Cisco is going to provide Max Insetion loss of 5.5 /6 dBm for those cards. So if the transmit power is -8dBm you can expect receiver sensitivity to be -13.5 to -14 dBm. For any problem cisco is going to support for 5.5 /6 dBm of loss.
It is possible that you can get more Max Insertion Loss (means distance) but don't expect Cisco to support it. With -9 dBm as Min Tranmit it is impossible to get the -19.5 dBm the Min Receive Sensititvity so possible they are thinking to extend some spec for more distance in future.
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