A zoom lens system discloses a zoom lens system which is small in size and exhibits favorable optical performance. A base program is executable by one or processors, and has one or more breakpoints. The first semiconductor material is selected to provide high mobility to a first carrier type. The apparatus can operate unattended so that it is not necessary for a physician or other health care worker to be present while measurements are being made. A rate of traffic at a port of a network device is measured, and the measured traffic rate is compared with a pre-set threshold rate. Judgment is then made upon whether the group management information is included in that management information.