Data Link Connection Identifier - meaning and definition. What is Data Link Connection Identifier
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What (who) is Data Link Connection Identifier - definition

NETWORK PROTOCOL
DLCI; DLCIs

Data Link Connection Identifier         
<networking> (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. http://etinc.com/frmain.htm#whatsadlci. (2000-02-13)
Data link connection identifier         
A data link connection identifier (DLCI) is a Frame Relay 10-bit-wide link-local virtual circuit identifier used to assign frames to a specific PVC or SVC. Frame Relay networks use DLCIs to statistically multiplex frames.
DLCI         
Data Link Connection Identifier (Reference: ATM)

Wikipedia

Data link connection identifier

A data link connection identifier (DLCI) is a Frame Relay 10-bit-wide link-local virtual circuit identifier used to assign frames to a specific PVC or SVC. Frame Relay networks use DLCIs to statistically multiplex frames. DLCIs are preloaded into each switch and act as road signs to the traveling frames.

The standard allows the existence of 1024 DLCIs. DLCI 0 is reserved for the ANSI/q993a LMI standard—only numbers 16 to 976 are usable for end-user equipment. DLCI 1023 is reserved for Cisco LMI, however, numbers 16 to 1007 are usable.

In summary, if using Cisco LMI, numbers from 16 to 1007 are available for end-user equipment. The rest are reserved for various management purposes. DLCI are Layer 2 Addresses that are locally significant. No two devices have the same DLCI mapped to its interface in one frame relay cloud.