Nortel Networks 1000 - Manual (Page 565)

Operation 565
See Figure 182 "Two-way, loop OAID, TIE trunk call states - incoming call
from far-end PBX" (page 566) and Figure 183 "Two-way, loop OAID, TIE
trunk call connection sequence - incoming call from far-end PBX" (page
567)
.
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 186 "Two-way, loop OAID, TIE trunk call states - incoming call
from far-end PBX" (page 570) and Figure 188 "Two-way, loop OAID, TIE
trunk call connection sequence - incoming call from far-end PBX" (page
572)
.
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 187 "Two-way, loop OAID, tie trunk call states
- incoming call from far-end PBX" (page 571) and Figure 191 "Two-way,
loop OAID, tie trunk call states - incoming call from far-end PBX" (page
575)
.
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 184 "Two-way, loop OAID, TIE trunk call states - outgoing call
to far-end PBX" (page 568) and Figure 185 "Two-way, loop OAID, TIE
trunk call connection sequence - outgoing call to far-end PBX" (page 569) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.