
10 Chapter 1 Embedded Computing
The link layer defines medium access control (MAC) and signaling link
access control (LAC). The MAC layer multiplexes logical channels onto the
physical medium, provides reliable transport of user traffic, and manages
quality-of-service. The LAC layer provides a variety of services: authentication,
integrity, segmentation, reassembly, and so on.
Example 1-2 describes a major effort to develop software radios for data
communication.
Example 1-2
Joint Tactical Radio System
The Joint Tactical Radio System (JTRS) [Joi05; Ree02] is an initiative of the
U.S. Department of Defense to develop next-generation communication systems ...