50 feet is quoted as a maximum cable length for RS232 but that limit has been extended in practical applications to far longer distances. The practical limit depends on the data rate, the type of cable and the environment in which it is installed.
RS232 is being replaced by other communication interfaces so although it can be extended further than the strict limit quoted by the standard, long cables will normally use other methods.
The current maximum length for a serial cable is around 50 meters. Different cables have length limits with the maximum varying.
18 feet i think <3 Edit: Actually it would be 50 feet.
Depends what you mean by a serial cable - Fibre, Ethernet, RS232, RS485, RS422, USB, HDMI, SMPTE292 are all examples of serial communications media. RS232 max length 50 ft Ethernet max length 100 m
Depends entirely on your application. Use as a jump rope would be different than if being used for a computer connection.
It refers to the 25-pin or 9-pin male serial port on the back of a PC. "A serial port conforms to the interface standard called RS-232c (Reference Standard 232 revision c), which is why a serial port is sometimes called the RS-232 port. The maximum cable length for a serial cable according to RS-232 standards is 50 feet. This interface standard originally called for 25 pins, but because microcomputers use only nine of those pins, manufacturers often installed a modified 9-pin port." -CompTIA A+ Guide to Managing & Maintaining You PC Sixth Edition
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There is no fixed or standard length. There are serial numbers of different lengths for different purposes.
RS422 and RS485 and the now popular USB
50 feet 50 feet
20IN.