Is there a command to find your optical tx/rx power (dBm) on a 3845? On a 3750 you can do a show int transceiver; looking for a comparable command for ISRs.
That features (called Digital Optical Monitoring), is dependant from the specific type of module used, not all have it, these that don't cannot report the power values.
Not sure if you can do this on a router but the SFP should have the "D" in the end of the part number like GLC-SX-MMD. This means that the SFP can support DOM.
