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NXDN Type-C Trunked Systems
Specified as the FB8* based full-featured digital protocol by the NXDN Forum, NXDN Type-C has been used for NEXEDGE since 2007. As well as Type-C it is known as Control Channel based or Centralized Control trunking, which is controlled centrally using a dedicated control channel that is continuously transmitting and receiving. As with MPT 1327, registration is required.
Type-C trunked systems provide increased call capacity, enhanced call capabilities, improved security and faster communications with less user interaction than conventional systems. The system automatically assigns channels for faster and more efficient use of spectrum, allowing users to concentrate on the job at hand.
• System Call Queuing Stacks call requests and processes calls when a channel becomes available. System operators can assign higher queue priority to certain users and preempt lower priority users for more important dispatch and emergency calls.
• Priority Monitor Monitor up to 4 high priority talk groups and automatically switches radios to a higher priority call, such as from a dispatcher or supervisor.
• Privacy Assures complete privacy for group and individual calls. Other users on the system cannot monitor calls.
• Late Entry Subscriber units may join a group or individual call already in progress after powering on or upon entering the system coverage area.
• Message Trunking Users are granted access to a traffic channel for the length of a two-way call to reduce interruptions by utilizing fewer system resources.
• Transmission Trunking Optimizes channel resources during peak traffic hours by allowing channel access only during each push-to-talk.
NXDN Type-D Trunked System
Economical alternative to the Type-C trunked system,
Type-D trunked system is the FB6* based digital LTR® protocol specified by the NXDN Forum. Unlike Type-C trunking, there is no dedicated control channel: trunking is under the control of the home repeater assigned to each radio. Similar to LTR, there is no need for registration.
    [ Trunked System ]
*FCC Station Class Code Designation

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