Customer premise network configuration to enable a new service within the network is provided by a network configuration manager. 15 or less where among values each obtained by measuring the average particle diameter of particles that constitute one of the two or more fillers, the largest value is let be D1 and the second largest value is let be D2. To remove or to mount the front panel, only one side panel has to be taken off first. The transfer pump is also a pump for priming the suction pump by means of a feed ejector provided on the feed circuit and immersed in the feeder tank. A write-protect portion, which switches the cartridge between the two modes, is provided with the operation portion, which is for switching between the modes, and is disposed near the opening.