An adjustable pulley assembly is provided for operably and reliably routing a line through one or more non-perpendicular angles of a line activated system, while maintaining a closed environment as the line changes directions. The adjusting screw is integral with a support which comprises a base pressing against the bottom of the fixed section. Modules can then be selected in said list with a view to deploying the service. When the user is finished with the use of the pop-up 10, they simply fold it up and secure it with a VELCRO, hook and loop, strap 38. Therefore, this invention enables to reproduce audiovideo data in real-time regardless of the presence of defective sectors and to avoid writing data to the defective sectors when new data is overwritten to the information recording medium. A modulation method and channels determining unit determines a modulation method and the number of channels to be allocated to a terminal apparatus which is a targeted communication party.