i am not able access Subsribe Module ,i dout somebody has been changed the IP FOR THE DEVICE ,Please do needful to provide step to reset the PMP_450 SM .
Do you have default plug? If yes please insert that in RJ-11 pert and reboot smt, Ip will revert to 169.254.1.1 and then you can choose desired Ip.
If you don’t have default plug, search in this forum, there are step to create one.
To make a default plug use a RJ-11, 6 pin connector and a small length of Cat 5 cable. Short (solder) together pins 4 and 6. Remaining wires should not be connected. Use heat shrink tubing to cover the exposed end of the cable.