2267 - Fire Tones - Automated Dispatch, Set as Priority Channel
2268 - Tac 3
2269 - Tac 4
2270 - Tac 5
2271 - Tac 6
2272 - Tac 7
2273 - Tac 8
2274 - Tac 9
2275 - Tac 10
2276 - Tac 11 (Training, Locked Out)
2277 - Tac 12 (Training, Locked Out)
2278 - Tac 13 (Training, Locked Out)
2279 - Tac 14 (Training, Locked Out)
All talk groups are shared among all four cities using a common dispatch center known as NTECC (pronounced In-Teck by crews on radio).
The simplest way to tell which city a unit belongs to is to listen for the middle number in their call-sign. Engine 101, for example would be Addison. The numbers are assigned as follows: Addison 10X, Carrollton 11X, Coppell 12X, Farmers Branch 13X. The X denotes the station the unit is from. Again, back with the example of Engine 101, that is Addison's Engine from station 1. Battalion Chiefs do not always follow this station numbering designation, however. Carrollton's Battalion 111 is at Station 2, for example. Every now and then you may hear a unit "Change quarters to station 1X9" where X is the city number. No cities on this system have a station 9. This is used to signify the unit is 'last up' for any calls in their city. Engine 112 for example would CQ to Station 119, thus being noted in the CAD as "E-1129" by dispatch. When a call comes in for their district, the CAD fails to find E-112, doesn't know what to do with E-1129, and therefore automatically assigns the call to the second due unit if they're available.
Most of these cities are in Dallas County, however, Carrollton spills over into Denton and Collin Counties.