Receptor for TNFSF2/TNF and homotrimeric TNFSF1/lymphotoxin- alpha. The adapter molecule FADD recruits caspase-8 to the activated receptor. The resulting death-inducing signaling complex (DISC) performs caspase-8 proteolytic activation which initiates the subsequent cascade of caspases (aspartate-specific cysteine proteases) mediating apoptosis. Contributes to the induction of non-cytocidal TNF effects including anti-viral state and activation of the acid sphingomyelinase. This is the function of Ensembl gene identifier ENSG00000067182 (TNFRSF1A, TNF receptor superfamily member 1A).