100 meters.
Which is 324 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
100 m
The max distance is 100 m.
802.11g is a wireless standard, and not a cable. However the max speed at which 802.11g can operate at is 54mbit/s.
Using UTP or STP cable, 100 meters per segment.
RS-232 standard is 50 feet.
The transmission speed of the cable is limited in most cases by the hardware attached to it. Cat5 basic cable has been used successfully up to 1 gigabit speed using ethernet. There have been lab tests proving it might be useful for 10gigabit over short ranges but usually that requires Cat5e or Cat6 grade cable. The most common speeds are 10/100 mb ethernet.
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100 meters
10mbs. It's known as RG58. Max length is 185 meters.
There isn't really a limit for cable length. The maximum length is determined by the loss you can afford to lose based on path loss, antenna gain, receiver sensitivity and transmitter power.
There are several retailers that sell Gigabit ethernet cables, including Office Max, Office Depot, Newegg, and Amazon. These products can also be purchased at select discount retailers, including Walmart and Sears.