Nortel-networks Circuit Card Manual do Utilizador descarregar pdf (Página 597)

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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.

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