here's a nice description with a picture In class we were talking about electrons tunneling across the insulator which we would normally expect to be separating conductors in a nanoscale systems
Tunnelling refers to encapsulation of protocol A within protocol B, such that A treats B as though it were a datalink layer Tunnelling is used to get data between administrative domains which use a protocol that is not supported by the internet connecting those domains
Encapsulation of complete datagrams within other datagrams Frequently used to transmit non-IP protocols across IP networks
- Use of an underground tunnel to convey wastewater, storm water or combined flows to a treatment facility Atlanta is already served by two wastewater tunnels - Three Rivers and Intrenchment Creek A tunnel will be constructed in the Nancy Creek sewer basin to convey sanitary sewer flows from DeKalb to the R M Clayton WRC, providing relief from sewage overflows for northeast Atlanta residents TBM -Tunnel Boring Machines used to excavate hard rock tunnels On the Nancy Creek Tunnel, there will be two electrically-powered, 18-foot diameter TBMs each equipped with thirty-nine - 19" disk cutters to cut the rock