Return to The History of The Telephone
In the 1970s, the very first cordless phones were introduced. In 1986, the Federal Communications Commission or FCC granted the frequency range of 47-49 MHz for cordless phones. Granting a greater frequency range allowed cordless phones to have less interference and need less power to run. In 1990, the FCC granted the frequency range of 900 MHz for cordless phones. In 1994, digital cordless phones and in 1995, digital spread spectrum (DSS) were both respectively introduced. Both developments were intended to increase the security of cordless phones and decrease unwanted eavesdropping by enabling the phone conversation to be digitally spreadout. In 1998, the FCC granted the frequency range of 2.4 GHz for cordless phones and as of 2003 the upward range is now 5.8 gigahertz.
How
Cordless Telephones Work
How cordless phones work and a brief
history of cordless phones.
