Network Access Device
A Network Access Device is an electronic circuit that automatically connects a user to a preferred network. More generally, a NAD is any device that, when connected to, provides access to a larger communication network of some sort.
Within the telecommunication industry, a NAD will be connected to a user's telephone. When the user dials a number, the NAD will 'listen' to the dialled digits and reroute the call through a network that will provide the best rates for the destination of the call. The NAD is often referred to as a dialler, predictive dialler or least cost routing dialler.
When used in broadband a NAD is a term to describe all the subscriber equipment required to make a connection to a wide area network from a local area network. The NAD normally includes a router, modem and a monitored power supply. Most NAD’s have the ability to report power failures and automatically reconnect themselves back to the network when disconnected.
In residential and business networks, Network Access Devices that are commonly seen include Wireless Access Points and Ethernet switches.
