Nortel Networks Circuit Card 311 - Manual (Page 649)

Operation 649
See Figure 198 "Two-way, loop OAID, TIE trunk call states - incoming call
from far-end PBX" (page 650) and Figure 199 "Two-way, loop OAID, TIE
trunk call connection sequence - incoming call from far-end PBX" (page
651)
.
When the 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 202 "Two-way, loop OAID, TIE trunk call states - incoming call
from far-end PBX" (page 654) and Figure 204 "Two-way, loop OAID, TIE
trunk call connection sequence - incoming call from far-end PBX" (page
656)
.
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 203 "Two-way, loop OAID, tie trunk call states - incoming
call from far-end PBX" (page 655) and Figure 207 "Two-way, loop OAID, tie
trunk call states - incoming call from far-end PBX" (page 659) .
When the Universal Trunk is seized by the far end on an incoming call, a
low resistance loop is placed across the tip and ring leads. Dial pulses are
sent by the far end by interrupting the loop current. The trunk is released
at the far end when the loop is opened. When it detects an open loop, the
near end reverts to a normal state.
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 200 "Two-way, loop OAID, TIE trunk call states - outgoing call to
far-end PBX" (page 652) and Figure 201 "Two-way, loop OAID, TIE trunk
call connection sequence - outgoing call to far-end PBX" (page 653) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.