In telecommunication, a tactical data information link--A (TADIL--A) is a netted link in which one unit acts as a net control station and interrogates each unit by roll call.
Note: Once interrogated, that unit transmits its data to the net. This means that each unit receives all the information transmitted. This is a direct transfer of data and no relaying is involved.
Source: from Federal Standard 1037C and from MIL-STD-188
