Described herein is a production method of sulfonated polyarylene that is safe and enables easy control of the amount and position of sulfonic groups introduced in the polymer. The data transmission cable comprises a tubular outer protective layer, an inner core disposed within the outer protective layer, a data transmission line carried within the inner core for transmitting secure data between the remote locations, and a fiber optic sensor line included in the outer protective layer for detecting unauthorized activity relative to the transmission line. The vacuum cleaner may be operated as an upright vacuum, or alternatively, the module can be separated from the base assembly and may be used independently of and at a great distance from the base assembly for a wide variety of cleaning purposes.