It is documented that 2 4250-SX-INT= can be installed into the 4250. I would like to know which of the following combinations are also supported by 4250: 4250-SX-INT= + IDS-TX-INT=, IDS-TX-INT= + IDS-TX-INT=, 4250-SX-INT= + IDS-XL-INT=, IDS-4FE-INT= ...