Nortel Networks 553-3001-211 Outgoing automatic, incoming dial operation, See on page 589 and on

NT8D14 Universal Trunk card Page 585 of 894

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 131 on page 587 and Figure 132 on page 588.

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 133 on page 589 and Figure 134 on page 590.

Circuit Card Description and Installation