Bundling of several lines in parallel to form one common connection. Benefits of this are the higher achievable data rate (as a sum of all data rates of the respective lines) and the better robustness: if one line fails, the throughput will decrease by the data rate of the failed line, but the connection as a whole will still remain stable.
Spectrum-efficient technology that establishes a queue to handle demand for voice or data channels.
Trunking means that several connections in a network may be established simultaneously, and that setup of connections proceeds automatically using the channels available at the time in question. In this way many users may share a few connections, and if the number of connections is increased, the capacity of the network is increased more than proportionally. This means that an optimal trunking effect is obtained in very large networks.