Within radio technology, LTR (Logic Trunked Radio) Standard systems have no dedicated control channel.
Each system site can have any number of radio channels from 1 through a maximum of 20.
This connection allows all the repeaters at a site to operate as one LTR system.
Each subscriber radio must be programmed with all channels in the system in proper logical channel order (the same requirement as EDACS systems).
LTR Standard Talkgroups are written in the format A-HH-GGG.