3-3. The TRI-TAC System
EAC use the TRI-TAC system as the primary area communications system. Similar to MSE, the TRI-TAC network forms a communications grid of area nodes which cover the area of operations. The area nodes normally interconnect by LOS SHF links up to 40 kilometers apart. Users gain access to the network at many extension nodes, which tie into the area nodes through LOS UHF links. The use of relay assemblages can increase the distance between nodes. TACSAT and TROPO links can further extend the range between nodes. See Figure 3-25.
Figure 3-25. TRI-TAC area communications system.
The TRI-TAC network is a digital, large volume, circuit switched system and has analog to digital converting capability. This allows the EAC customers to use the same DSVTs and DNVTs as corps and below subscribers. It is designed around the AN/TTC-39D area node switch. The AN/TTC-39D, an upgraded switch, provides packet switching, flood search routing, and subscriber affiliation for the TRI-TAC network.
In addition to voice communications, TRI-TAC can switch message traffic with the tactical message switch, AN/TYC- 39. The AN/TYC-39D is an automatic, store-and-forward message switch.
Continue with Chapter 3
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