NT8D14 Universal Trunk card Page 589 of 894
Circuit Card Description and Installation
Figure 133
Two-way, loop OAID, TIE trunk call states – outgoing call to far-end PBX
System (near) end
Near end
originates
Far end
disconnect
Near end
disconnect
Idle
Near end
disconnects
first
Far end
answers
553-AAA1147
Far end
disconnects
first
Ground on tip,
battery on ring
Battery on tip,
ground on ring
Low-resistance loop High-resistance loop
Far end