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data link layer

   Also found in: Acronyms, Wikipedia 0.04 sec.

The services in the OSI protocol stack (layer 2 of 7) that manage node-to-node transmission. See data link protocol, OSI and MAC layer.

(networking)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.
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PCI Express supports two levels of Error Correction Codes (ECC) checking for both Data Link Layer and Transaction Layer errors.
Implementing PCI Express for storage by Szydlowski, Craig / Computer Technology Review
The Eureka PCI Express Controller Core includes the Transaction Layer, Data Link Layer and Physical Layer of the PCI Express Specification.
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ACKs are also generated for received TLPs to emulate the Data Link Layer and preserve the link.
LeCroy Introduces Gen2 PCI Express Link Trainer by Business Wire
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