Look up: Tunnelling

1. 
   tunnelling
   Using a communications protocol to carry data between networks across an interconnecting network. The interconnecting network sees only the tunnel protocol, not the protocol elements carried by it. Examples in the mobile world include GPRS GTP and SNDCP. In the wider IP world, IPsec (secure IP), is often quoted but it works by extending the IP packet header and is not therefore tunnelling in the strict sense.
   Found on http://www.flying-boat.co.uk/glossary/
   
   
2. 
   tunnelling
   The process by which a particle or a set of particles crosses a barrier on its potential energy surface without having the energy required to surmount this barrier. Since the rate of tunnelling decreases with increasing reduced mass, it is significant in the context of isotope effects of hydrogen isotopes.
   Found on http://www.chem.qmul.ac.uk/iupac/gtpoc/T
   
   
3. 
   tunnelling
   (networking) (US: 'tunneling') Encapsulation of protocol A within protocol B, such that A treats B as though it were a data link layer. Tunnelling is used to get data between administrative domains which use a protocol that is not supported by the internet connecting those domains. (1997-03-26)
   Found on
   
   
4. 
   tunnelling
   the penetration of a potential barrier by electrons whose energy(by classical reasoning)is insufficient to overcome the height of the barrier Category: Electrical engineering and energy • tunnels are grouped in four broad categories soft ground hard rock soft rock and subaqueous nearly all tunnelling operations involve investigation,excavation and materials transport,etc. Category: ...
   Found on http://www.mijnwoordenboek.nl/definition
   
   
5. 
   Tunnelling
   • of Tunnel
   Found on http://thinkexist.com/dictionary/meaning
   
   
6. 
   Tunnelling
   An architecture which enables the point-to-point transmission of electronic data in a format different from the format in which it originated and was ultimately received. Tunneling can be used to send non-IP protocols (e.g. IPX, AppleTalk) over an IP network such as the Internet. It can also be used to transmit unencrypted data over the transmission media in encrypted format without requiring encr...
   Found on http://www.tedhaynes.com/haynes1/newterm
   
   
7. 
   tunnelling
   technique for connecting two networks via a third network while totally isolating the connected traffic from other traffic in the third network NOTE - See Figure A.2.
   Found on http://www.electropedia.org/iev/iev.nsf/