Boeing FMC question
"If the MCP altitude is set to an altitude below the current cruise altitude but above the first descent constraint, and the aircraft is greater than 50NM from the top-of-descent point, the cruise altitude is lowered to the MCP selected altitude. If the aircraft is within 50NM of the top-ofdescent, an early descent is initiated consisting of a 1250 fpm descent until the descent path is intercepted."
What happens if the MCP is placed below the first descent constraint at more than 50 miles back from TOD?