Logical link control

thumb|Acoustic coupler modems used a telephone handset as the audio medium, with the user dialing the desired number and then pressing the handset into the modem to complete the connection. These systems generally operated at a speed of 300 bits per second.

a simple data link layer protocol used between two devices

sublayer of the Open Systems Interconnection model

bit-oriented code-transparent synchronous data link layer protocol

computer network protocol

encapsulation of the Internet Protocol designed to work over serial ports and modem connections

management of data rate

error-control method for data transmission

IEEE standard

thumb|200px|LAPB state Diagram Link Access Procedure, Balanced (LAPB) implements the data link layer as defined in the X.25 protocol suite. LAPB is a bit-oriented protocol derived from HDLC that ensures that frames are error free and in the correct sequence. LAPB is specified in ITU-T Recommendation X.25 and ISO/IEC 7776. It implements the connection-mode data link service in the OSI Reference Model as defined by ITU-T Recommendation X.222.

error-detecting code in some data-link layer communications protocols

automatic repeat-request (ARQ) protocol in data transmission and error detection

protocol used by network devices for advertising their identity

computer network protocol

basic automatic repeat-request (ARQ) data transmission and error detection protocol

hybrid error-detection and correction code in communications

automatic repeat-request (ARQ) data transmission and error correction protocol

protocol specified by 3GPP used in UMTS and LTE

Gigabit Home Networking (G.hn) is a specification for wired home networking that supports speeds up to 2 Gbit/s and operates over four types of legacy wires: telephone wiring, coaxial cables, power lines and plastic optical fiber. Some benefits of a multi-wire standard are lower equipment development costs and lower deployment costs for service providers (by allowing customer self-install).