[Sephiroth]

Also I'm puzzled as to why an attenuator would need to be fitted for upload power? BBings will correct me quickly where I might be wrong, but upstream power is determined by the CMTS based in its SNR estimate. If an upstream attenuator is fitted, I'd expect the CMTS to continue to raise the upstream power to combat whatever noise is on the circuit and if none (now) to overcome the attenuator.