(1) See
digital loop carrier.
(2) (
Data
Link
Control) See
data link and
OSI model.
(3) (
Data
Link
Control) The data link layer protocol (layer 2) that is used in IBM's SNA networking. See
SNA,
data link protocol and
Microsoft DLC.
(4) (
Data
Link
Connector) A vehicle diagnostic plug and socket. See
OBD.