Nortel Networks Circuit Card - Manual (Page 589)

NT8D14 Universal Trunk card Page 589 of 906
Circuit Card Description and Installation
Outgoing calls
In an outgoing call configuration, the NT8D14 Universal Trunk card is
connected to an existing PBX by a tie trunk. See Figure 127 on
page 590 and
Figure 128 on page 591 .
An outgoing call from the near-end seizes the trunk facility by placing a
low-resistance loop across the tip and ring leads. Outward addressing is then
applied from the System in the form of DTMF tones or dial pulses. If answer
supervision is provided by the far-end, reverse battery and ground on the tip
and ring leads are returned. The operation represented in Figure 129 on
page 592 and Figure 130 on page 593 also applies to outgoing calls on a DID
trunk.
Note: Where no far-end answer supervision is provided, the party at the
near-end hangs up, after recognizing far-end call termination.