| HDLC | High Level Data Link Control [Protocol] |
| DLS | Data Link Control |
| DLC | Data Link Control [IBM] |
| DLCX | Data Link Control Exchange |
| EDLC | Ethernet Data Link Control |
| DLCF | Data Link Control Field |
| SDLC | Synchronous Data Link Control [IBM] |
| UDLC | Universal Data Link Control |
| BDLC | Burroughs Data Link Control [engl.] Steuerungsprotokoll für Datenverbindungen [Firmenbezeichnung] |
| LLA | Link Level Access |
| HLL | High Level Language |
| HLE | High Level Emulation |
| VHLL | Very High Level Language |
| hilt | HIGH-LEVEL THESAURUS Glasgow, [GB], http://hilt.cdlr.strath.ac.uk |
| HILI | High Level Interface |
| HLQ | High Level Qualifier |
| HEM | High-level Entity Management |
| CHILL | CCITT HIgh Level Language |
| HLDS | High Level Design Systems |
| MOHLL | Machine Oriented High Level Language |
| HEMP | High-level Entity Management Protocol [Internet] |
| HEMS | High-level Entity Management System [Internet] |
| HLLAPI | High Level Language Application Programming Interface |
| HDSL | High rate Digital Subscriber Link |
| HL | Hop Level [Flow Control] |
| ALC | Automatic Level Control [engl.] Automatische Pegelregelung |
| SLC | Synchronous Link Control |
| LLC | Logical Link Control |
| RLC | Radio Link Control |
| LIC | Logical Link Control |
| DL | Data Link |
| LACP | Link Aggregation Control Protocol |
| QLLC | Qualified Logical Link Control |
| LLC2 | Logical Link Control Class 2 |
| LCP | Link Control Protocol [Internet] |
| DLE | Data Link Escape |
| FDL | Factory Data Link |
| DLI | Data Link Interface University of Illinois, USA, dli.grainger.uiuc.edu |
| DLL | Data Link Layer |
| DLSw | Data Link Switching |
| L2CAP | Logical Link and Control Adaptation Protocol |
| CALLE | Control Application Link Layer Engieering |
| DLCI | Data Link Connection Identifier |
| DLSW | Cisco Data Link Switching Plus |
| RTDL | Real-Time Data Link |
| DLPI | Data Link Provider Interface |
| DLLP | Data Link Layer Protocol |
| XDLE | Transparent Data Link Escape |
| ODI | Open Data-Link Interface [Novell] |
| HSD | High Speed Data |