SAR definition by Webster's New World
SAR definition by American Heritage Dictionary
sar - Computer Definition
In the ATM reference model, a sublayer of the ATM Adaptation Layer (AAL) that functions to segment the user data into payloads for insertion into cells, prior to transmission. At the receiving end of the communication, the SAR extracts the payload from the cells and reassembles the data into the information stream as originally transmitted. See also AAL, ATM reference model, cell, and payload.
(1) (Specific Absorption Rate) A unit of measurement of the rate that energy is absorbed into the body. The SAR is watts per kilogram of human tissue. In the U.S., the maximum SAR for a cellphone is 1.6 watts per kilogram. Some phones are lower than 0.2.
(2) (Segmentation And Reassembly) The protocol that converts data to cells for transmission over an ATM network. It is the lower part of the ATM Adaption Layer (AAL), which is responsible for the entire operation. See AAL.