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Trunking is a more automated and complex radio system, but provides the benefits of less user intervention to operate the radio and greater spectral efficiency with large numbers of users. Instead of assigning a radio channel to one particular user group at a time, users are instead assigned to a logical grouping, a talkgroup .
USS Wickes (DD-578), a Fletcher-class destroyer, was the second ship of the United States Navy to be named for Captain Lambert Wickes (1735–1777), ...
Trunking in telecommunication originated in telegraphy, and later in telephone systems where a trunk line is a communications channel between telephone exchanges. Other applications include the trunked radio systems commonly used by police agencies. [1] In the form of link aggregation and VLAN tagging, trunking has been applied in computer ...
In this system twelve voice channels are multiplexed in a high frequency carrier and passed through a balanced pair trunk line similar to those used for individual voice frequency connections. The original system is obsolete today, but the multiplexing of voice channels in units of 12 or 24 channels in modern digital trunk lines such as T-1 is ...
Logic Trunked Radio (LTR) is a radio system developed in the late 1970s by the E. F. Johnson Company. [1] LTR is distinguished from some other common trunked radio systems in that it does not have a dedicated control channel. LTR systems are limited to 20 channels (repeaters) per site and each site stands alone (not linked).
The result: three companies built APCO Project 16 compliant systems but radios from each manufacturer were incompatible with one another. In California, for example, University of California, Riverside bought a Motorola system and the County of Riverside purchased a General Electric. In order to communicate, some patch or other custom-built ...
The line switches will also talk to AT&T SLC-96 pedestals – 96 lines on a ped; DCO-CS (Long-distance, very limited lines – 1+ trunking to long-distance all T-1 cards) Note: DCO systems are now supported by GENBAND
The first system in an area typically used the default tone of 3051.9 Hz, while 2918.7 Hz could be used for an additional system on the same channel(s) that might have some coverage overlap. Radios using the system had to have their continuous tone set to match the desired system and have a compatible two-tone sequence for their group.