Editing Computer-aided dispatch (section)

==Consoles==
[[Image:TRANSIT cad.png|500px|thumb|right|A dispatch facility used by [[Denver, Colorado|Denver]] RTD features a radio communication consoles and a GPS-based [[Automatic vehicle location|AVL]] system. Left picture is dispatcher console position. Right picture is supervisor's console. At right is a drawing showing basic controls for a single channel.]]
[[Image:moderne Leitstelle.jpg|thumb|Ambulance dispatch center in [[Austria]].]]
[[Image:moderne Leitstelle Arbeitsplatz.jpg|thumb|Console with CAD and voice switch]]

Typical of local government dispatching facilities, the Denver RTD's facility is one example of a transit dispatch center. Communications consoles are mounted in desk-style electronics racks. Features include multi-line telephones. Modern facilities usually include a variety of computing systems for operational and administrative purposes. 

Consoles serve as a human interface and connect to push-to-talk dispatch radio systems. Audio from all channels is processed through [[audio level compression]] circuits and is routed to two separate speakers identified as ''select'' and ''unselect''. Each has a volume control. The select channel or channels carry the highest priority communications. To prevent missed messages on critical channels, the select volume may be configured so it cannot be set to an inaudible level. Unselect channels may be used for special events, other agencies, or purposes that do not involve dispatch and may be inaudible. By pressing a button, any channel on the console can be toggled between select and unselect status. Each channel has an independent push-to-talk button, allowing the dispatcher to talk over one channel at a time. For broadcast messages, a single button transmits over all selected channels at the same time. A digital clock and an [[LED]] bar-graph or [[VU meter]] are included.  

Each channel has a label identifying it and indicator lights and buttons to control settings. A typical channel has a busy light, a call light, select light, select button, and a transmit button. The steady, red busy light indicates another dispatch position is transmitting on the channel. The flashing yellow call light indicates a field unit is talking on the channel. The call light usually blinks for several seconds after a transmission ends allowing a busy dispatcher to look up from a telephone call and determine which channel the last message came from.

Some console dispatch panels are actually a PC-based application. Such is the case of Zetron's Acom system and Avtec's Scout system. This allows for easy customization and modification of the dispatch key layout.