Data Link Control
The Data Link Control (DLC) is a data transmission service that ensures the secure, error-free transmission of data via a non-storing, continuous transmission channel. This service is part of the OSI reference model and can be found in the data link layer .
It is implemented using a wide variety of data transmission protocols that are adapted to the respective transmission paths; as an example for analog Fe- modems the X-modem protocol.
There is a physical direct connection between two systems. The DLC divides the information to be transmitted into data blocks (so-called "frames"), operates error detection by adding error detection information and monitors the data flow (for example by protecting a slow receiver from an overflow by a fast transmitter) in an intermediate buffer is used at the endpoints, but not in transit.
There are two types of protocols, point-to-point and multicast protocols. With multicast, the data link control is divided into two layers, logical link control and media access control.
See also (incomplete list of protocols)
- High-level data link control (HDLC)
- Synchronous Data Link Control (SDLC)
- Link Access Procedure Balanced (LAPB)
- X.25
- Serial Line Internet Protocol (SLIP)
- Point-to-Point Protocol (PPP)
- Media Access Control (MAC)
- Ethernet (IEEE 802.3)
- Token Bus (IEEE 802.4)
- Token Ring (IEEE 802.5)
literature
- Gurdeep S. Hura, Mukesh Singhal: Data and Computer Communications. Networking and Internetworking, CRC Press LLC, Boca Raton 2001, ISBN 0-8493-0928-X .
- Kristof Obermann, Martin Horneffer: Data network technologies for Next Generation Networks. 1st edition, Vieweg + Teubner, Wiesbaden 2009, ISBN 978-3-8348-0449-5 .
- Hugo Schröer, Thomas Stalke: The SNA network architecture . Friedrich Vieweg & Sohn Verlagsgesellschaft, Wiesbaden 1993, ISBN 978-3-322-91564-1 .
Web links
- IBM: Communications Programming Concepts - Generic Data Link Control Environment Overview . March 30, 2013.
- Microsoft TechNet: The Data Link Control Interface . March 30, 2013.