The Loop-C5400 shelf is designed to be used as the card holder of
the point-to-point CSU/DSU devices at the central office. Its a
low-cost derivative of the Loop-C5400. The type of plug-in card can
be either the low-cost non-manageable card or the managed card. The
plug-in cards with different type can be mixed together. The C-5400
serves as a collection of stand-alone devices at the central
office. Each line card is equivalent to a stand-alone CSU/DSU
device. No traffic flow between cards on this system. By offering
point-to-multiple-point leased line service, the C-5400 is a
perfect solution to the DDN and internet network.