UDP
The User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite, the set of network protocols used for the Internet. With UDP, computer applications can send messages, in this case referred to as datagrams, to other hosts on an Internet Protocol (IP) network without prior communications to set up special transmission channels or data paths.

UPNP
UPNP stands for Universal Plug and Play. UPNP is supposed to automatically port forward the necessary ports for a DVR, but over time, it doesn’t work very well. For the best results, we recommend disabling this setting and manually port forwarding in your router.

USB
Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that defines the cables, connectors and communications protocols used in a bus for connection, communication and power supply between computers and electronic devices.