The difference between a multiplexer and a statistical multiplexer is

• Statistical multiplexers need buffers while multiplexers do not need buffers
• Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol
• Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
• Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
• None of the above