The RS232 standard specifies a nominal upper limit for the data signalling rate of 20 000 bits per second (20kbaud). Some applications use however data rates well beyond the maximum 20kbaud but faster transmission standards like RS423, RS422 and RS485 must be recommended. The cable length is in RS232C specified to maximum 15 meters but is not mentioned in EIA-232-D, as the maximum length is normally limited by the load capacitance from the cable (typ. 150pF/m). EIA-232-D specify a maximum generator or driver load capacitance of 2500pF. The combination of the driver's output current capability, the load capacitance (cable length) and the standard's switching requirements should be considered in every design, especially if CCITT V28 should be met, but are often ignored.