A cartridge for histological specimen slides includes a generally enclosed body and a slide holder. The distribution media then transmits the hash to the target or client, the hashes are compared, and, if they do not match, the update files are downloaded for further review and updating, if desired. The blades 46 are grouped and centered on the winding tunnels of the armature with the axially outer edges of the blades of each group joined together by a radial wall 50 within the radial spacing of the annulus of the plate 42 but axially spaced therefrom. A circuit and method for reducing fixed pattern noise. The communication system, upon implementing a broadcast-type multicast service, enhances compensation of communication breaks when detecting and recovering from a fault in an IP network, and reduces the network traffic.