<networking, protocol> (LLP, or lower-layer protocol) Any protocol residing in OSI layers one to four.
These protocols package, route, verify and transmit datagrams. A prime example would be TCP/IP. Lower layer protocols support the upper layer protocols.
(1999-02-17)
Try this search on Wikipedia, OneLook, Google
Nearby terms: low-bandwidth « Low Bandwidth X « low earth orbit « Lower Layer Protocol » lower set » Low Insertion Force » LOWL