Multiaccess Link Control

摘要: The need for multiaccess protocols arises whenever a resource is shared (and thus accessed) by number of independent users. One main reason contributing to such situation the share scarce and expensive resources. An excellent example typified time-sharing systems. Timesharing was developed in 1960s make powerful processing capability large computer system available population users, each whom has relatively small or infrequent demands so that dedicated cannot be economically justified. Two advantages are gained: smoothing effect populations on demand, an resulting from law numbers, lower cost per unit service (almost always existing) economy scale.