The MIC-3039-B is a slim and rugged 1U enclosure with two 6U CompactPCI slots for rack mounting. Being only 1U in height, the MIC-3039-B provides the space efficiency required in space-limited environments, which is especially ideal for carriers and service providers deploying revenue-generating services for customers. The MIC-3039-B supports IEEE 1101.11 rear I/O transition boards. Users can route I/O signals to the rear transition boards to simplify system cabling. Front boards pop in and out without the need to do any hardwiring. The MIC-3039-B is suitable for some applications where devices are not essential. The OS can be stored on a CompactFlash card or a 2.5” HDD by choosing the appropriate CPU card.