Data Link Connection Identifier


(DLCI) A channel number which is attached to data frames to tell a Frame Relay network how to route the data. In Frame Relay, multiple logical channels are multiplexed over a single physical channel. The DLCI says which of these logical channels a particular data frame belongs to.

Last updated: 2000-02-13

data link layer


Layer two, the second lowest layer in the OSI seven layer model. The data link layer splits data into frames (see fragmentation) for sending on the physical layer and receives acknowledgement frames. It performs error checking and re-transmits frames not received correctly. It provides an error-free virtual channel to the network layer. The data link layer is split into an upper sublayer, Logical Link Control (LLC), and a lower sublayer, Media Access Control (MAC).

Example protocols at this layer are ABP, Go Back N, SRP.

Last updated: 1995-02-14

data link level

data link layer

Data Link Provider Interface


(DLPI) The interface that a network driver presents to the (higher level) logical link layer for driving the network at the datagram level in a Unix STREAMS environment and possibly elsewhere.

DLPI corresponds to ISO 8802/2 (LLC) which covers both connection-oriented and connectionless protocols.

[Is this correct? Better explanation?]

Last updated: 1996-01-29

Data Link Switching


(DLSw) A standard for transporting IBM Systems Network Architecture (SNA) and network basic input/output system (NetBIOS) traffic over an Internet protocol network.

Initially, in 1992, DLSw was proprietary to IBM. It was submitted to the IETF as RFC 1434 in 1993, later updated by RFC 1795.

Last updated: 2008-01-11

Nearby terms:

dataless management utilityData Link Connection Identifierdata link layer

Try this search on Wikipedia, OneLook, Google