Photon-Counting Detectors for Digital Radiography and X-Ray Computed Tomography

In a connection admission controlling system, a call admission processing and allocating device judges whether or not a call is admitted in response to a peak rate of a traffic and allocates, as a temporary bandwidth, the peak rate to the call when the call is admitted. A resource controlling device has a connection call controlling table which holds call connection data of calls each of which has at least one of the temporary bandwidth and an effective bandwidth. A traffic measuring device measures a traffic of the call to produce a measured traffic. An effective bandwidth computing and allocating device has a new call controlling table which holds new call connection data representing data of calls each of which have the temporary bandwidth. The effective bandwidth computing and allocating device computes the effective bandwidth by using the measured traffic and allocates the effective bandwidth to the call.