This document specifies the MAC layer procedures for logical channels on the U_m2 interface. The procedures are specified in the following categories:

• General procedures

• CCH procedures

• VCH procedures

• DCH procedures

This document also provides informational LCCH call control examples (Annex A), VCH PTT and call termination examples (Annex B), and VCH call setup examples (Annex C).

The information necessary to enable an interoperable MAC layer protocol for twoslot TDMA logical channels is provided in this document or referenced in other documents as appropriate. This document assumes the reader has a good working knowledge of the two-slot TDMA document suite identified in [7] and of trunked LMR systems as described in [6].