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(gentle music) - Trunk networks get their name from the world of telephony. Traditionally two cites would bundle together their connections into a single thick line like the trunk of a tree, referred to as a trunk line, and then the local household looped lines would be like the branches of a tree, one line for each household. The reason why trunking has become important is because it offers some huge advantages over conventional for larger agencies. A conventional system is a system that has dedicated channels dedicated to a specific user or group of users. You select a channel manually by moving a selection knob on a radio or pressing some buttons or maybe using some kind of drop down menu in a display. So conventional means selecting the channel in order to communicate. So dedicated to particular users. Channel one might be fire, channel two might be fire chief's, channel three might be animal control. In order to communicate with these particular groups a user has to make a channel selection first by hand, manually. Conventional has some huge advantages. Why it's still popular around the world today. It's very fast to setup a call, it's easy to use and it's pretty inexpensive. However, there are some down sides as well. Remember conventional means using dedicated channels that are manually selected and when a channel is being used it's used exclusively by one caller. So anybody else who wants to make a call on that channel has to wait until the call is over. It's an inefficient use of radio channels. I mean think for a moment, channel one the fire channel, you'd expect to be busy all the time, but channel three the animal control channel well how many loose dogs are there, that channel can go idle. So while you've got callers waiting to have a crack at channel one they can't make use of channel three even though it's completely idle. If you wanted to add groups for example you'd have to add a new channel that they can select. In a sense you're limited by how many channels you can select from manually and also adding a new channel or a new user group to this whole radio system means that you'll have to go out and reprogram all the radios all over again. There is a bit of a trade off. I mean if you're a small agency a conventional system is absolutely perfect, if you know the groups that they are going to be communicating with why not go for a conventional system, but as soon as the number of groups, the number of users that you're working on a system increases you might actually like to consider trunking instead. Trunked radio might be better called computer controlled or computer aided radio. A trunk user identifies another user or group of users they wish to communicate with and a computer automatically assigns them the first free available channel from a pool of...