Which two wireless technologies can interfere with 802.11 networks?

DECT is a radio technology for voice data applications (such as cordless telephones, wireless offices and even wireless telephone lines to the home). DECT uses time division multiple access (TDMA) to transmit radio signals to phones and is best-suited to smaller areas with a large number of users.

Digital Enhanced Cordless Telecommunication (DECT), also known as cordless telephones. and Zigbee are both well-known sources of interferences within an 802.11 network.