Chapter 5 IS-2000 Layer 2 (Medium and Signaling Link Access Control Layers)
The IS-2000 Layer 2 protocol provides link-layer services over the Um interface. Such services can be distinguished as those offered to the IS-2000 signaling layer, or Layer 3, and those offered to end-user applications and services. Layer 2 is split into two sublayers, the Medium Access Control (MAC) [1] and Signaling Link Access Control (Signaling LAC) [2].
The main function of the LAC layer is to provide transport to signaling messages originating from Layer 3. To achieve that, the LAC properly encapsulates the Layer 3 messages into LAC protocol data units (PDU) that are subject to fragmentation and reassembly to make them suitable for transport by the lower layers. ...
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