Nortel Networks Circuit Card - Manual (Page 597)

NT8D14 Universal Trunk card Page 597 of 906
Circuit Card Description and Installation
Note: Pseudo-answer supervision is provided by near-end at expiration
of end-of-dial timer. Where no far-end answer supervision is provided,
the party at the far-end hangs up after recognizing near-end call
termination.
Outgoing automatic, incoming dial operation
Incoming calls
When the NT8D14 Universal Trunk card is seized by the far-end on an
incoming call, a low-resistance loop is placed across the tip and ring leads.
Addressing is then sent by the far-end in the form of battery-ground or loop
pulses, or DTMF tones. The trunk is released at the far-end when the loop is
opened. When the near-end detects an open loop, it returns to a normal state.
See Figure 134 on page 599 and Figure 135 on page 600 .
Outgoing calls
When seized as a dial-selected outgoing trunk, the near-end places the battery
on the tip and ground on the ring. This alerts the far-end of the seizure. The
far-end responds with a low resistance across the tip and ring leads.
See Figure 136 on page 601 and Figure 137 on page 602 .