[Sephiroth]

If the tuners in the SH are affected by the high power, like there is crosstalk, or an amplifier is overdriven, then there will be downstream FEC errors (that are not pblicly reported in the SH Logs but which were reportrdd in the VMNG 300).

But yes, if there is congestion anywhere, the attenuator won't do anything other than prevent collapse when the SH is eventually provisioned with 8 DS channels.