An optical fiber ribbon and an optical fiber cable capable of suppressing deterioration of polarization mode dispersion and effective in improving the communication capacity in wavelength multiplex communication. In order to increase the service life of the battery, the timeout is changed in dependence on a characteristic value which is correlated with the capacity of the battery. The plurality of protrusions are configured so as to hold the plurality of twisted pairs away from the inner circumferential surface of the jacket, and may provide an air gap between the plurality of twisted pairs of insulated conductors and the inner circumferential surface of the jacket, thereby reducing susceptibility of the plurality of twisted pairs to alien near end crosstalk. In this manner, instead of dispatching a message via the SMS, the sending of an adapted voice mail message directly to a mobile station and storing it thereat makes it possible to avoid that a user has to poll a service center by calling in order to have the message delivered. The lip ring has a ring surface. The tension control device can be adjusted to increase or decrease the tension in the cords so that the supports are detachably coupled to or detached from the hub.