DHCP - (Dynamic Host Configuration Protocol) - In terms of set-top boxes it's a protocol where networked set-top boxes are automatically assigned a unique network number. DHCP is used by various communication related machinery such as routers, computers, and network adapters.
http://en.wikipedia.org/wiki/DHCP

DNS/DHCP IP Management Software for Service Providers - Service Provider IP management solutions for Domain Name System (DNS) and Dynamic Host Configuration Protocol (DHCP) enterprises. It should be compatible with different technologies and platforms as well as offer extensive add-on tools.

DNS - Digital Network Services

See the Interactive Television Institute.