the data link layer is the layer of the osi model that is responsible for end-to-end data transmission and error recovery.
which layer of the osi model is responsible for end-to-end data transmission and error recovery?
the data link layer
local area networking standards such as ethernet and ieee 802 specifications use terminology from the seven-layer osi model rather than the tcp/ip model. the tcp/ip model in general does not consider physical specifications, rather it assumes a working network infrastructure that can deliver media level frames on the link. therefore, rfc 1122 and rfc 1123, the definition of the tcp/ip model, do not discuss hardware issues and physical data transmission and set no standards for those aspects. some textbook authors have supported the interpretation that physical data transmission aspects are part of the link layer. others assumed that physical data transmission standards are not considered communication protocols, and are not part of the tcp/ip model. these authors assume a hardware layer or physical layer below the link layer, and several of them adopt the osi term data link layer instead of link layer in a modified description of layering. in the predecessor to the tcp/ip model, the "arpanet reference model" (rfc 908, 1982), aspects of the link layer are referred to by several poorly defined terms, such as "network-access layer", "network-access protocol", as well as "network layer", while the next higher layer is called "internetwork layer". in some modern text books, "network-interface layer", "host-to-network layer" and "network-access layer" occur as synonyms either to the link layer or the data link layer, often including the physical layer.
link layer
bullet::::- v.35 is an itu-t standard located on layer 1 on the osi model. max speed is 2 mbit/s. withdrawn itu-t recommendation for 48 kbit/s data transmission over wideband circuits. the physical and electrical characteristics of this interface are now specified in itu-t recommendation v.11.





























bullet::::- v.36 is an itu-t standard located on layer 2 on the osi model called modems for synchronous data transmission using 60-108 khz group band circuits.





























section::::error control and data compression.





























"applies to v.40–v.49"
list of itu-t v-series recommendations