A cordless telephone that uses separate frequencies for transmission

a-cordless-telephone-that-uses-separate-frequencies-for-transmission

A cordless telephone that uses separate frequencies for transmission in base and portable units is called _________

A. half duplex

B. duplex

C. simplex

D. one-way communication

The question was asked in unit test.

My question is from Method of Generation of SSB-SC in chapter SSB Modulation of Analog Communications

Right option is B. duplex

To explain I would say: In duplex communication, two-way interaction is favourable simultaneously. Thus, a cordless telephone is duplex which uses separate frequencies for transmission in base and portable units.