Re: Question on EWDM - Damage exposure to X2 over short testing
The X2-DWDM receiver's damage threshold is -1dBm.
The X2-DWDM max transmit power is +3dBm (min -1dBm)
The EWDM-MUX-8 combined Mux/Demux DWDM (same channel) insertion loss is 4.7dB.
+3 - 4.7 = -1.7dBm optical receive power (worst case)
So you shouldn't damage the X2-DWDM's receiver.
BUT, the X2-DWDM module's maximum "operating" optical input power is -7. So, you should install the 10dB attenuator to make sure that your optical input signal is within the operating range of the X2-module. Otherwise, you may have a high bit-error ratio on the link due to overloading of the optical receiver.
You could install the attenuators between the two EWDM-MUX-8 filters as well.
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