Table 3-2. Node Switch to EAC via AN/TRC-173/174
d. MSE/TRITAC interface.
(1) Calls from the MSE network to EAC are routed via flood search (by MSE) to a
gateway MSE node switch. The node switch routes the call over a designated path to the
AN/TTC-39 circuit switch at EAC, which then automatically switches the call to the designated
(2) Calls from the EAC network to MSE are routed by the AN/TTC-39 circuit switch
to a designated MSE node gateway switch. The MSE node switch then routes the call to the
called party via flood search.
(3) To place a direct call from the MSE to the EAC network, the MSE subscriber
must know the called party's 3-digit area code and 7-digit subscriber number. She then dials the
number like she would in a commercial telephone system. To place a direct call from the EAC
network to MSE, the TRITAC user must know the called party's 3-digit area code and 7-digit
MSE directory number. He then dials the number like he would in a commercial system. Area
codes for telephone networks are normally obtained from the next higher HQ. Information on
area codes can also be found in Standardization Agreement (STANAG) 4214. The subscriber
telephone numbers are obtained from the unit's telephone directory. The MSE/TRITAC
interface is illustrated in Figure 3-8, page 3-16.