Nortel Circuit Card 311 Reference page 598

598 NT8D14 Universal Trunk card
Ground start operation is configured in software and implemented through
software download messages. In the idle state, the tip conductor from the
CO is open and a high-resistance negative battery is present on the ring
lead.
Ground start operation is configured in software and implemented through
software download messages. In the idle state, the tip conductor from the
CO is open and a high-resistance negative battery is present on the ring
lead.
Ground start operation is configured in software and implemented through
software download messages. In an idle state, the tip conductor from the
CO is open and a high resistance negative battery is present on the tip
of the trunk.
Incoming calls
In an incoming call, after ground is detected on the tip, the universal trunk
card scans for a ringing detection signal before presenting the call to an
attendant and tripping the ringing. When the attendant answers, a low
resistance is placed across the tip and ring conductors, which trips CO
ringing and establishes a speech path. See
states - incoming call from CO/FX/WATS" (page 599)
"Ground start call connection sequence - incoming call from CO/FX/WATS"
(page
In an incoming call, after ground is detected on the tip, the universal trunk
card scans for a ringing detection signal before presenting the call to an
attendant and tripping the ringing. When the attendant answers, a low
resistance is placed across the tip and ring conductors, which trips CO
ringing and establishes a speech path.
See
(page 604)
incoming call from CO/FX/WATS" (page
In an incoming call, after ground is detected on the tip, the universal trunk
card scans for a ringing detection signal before presenting the call to an
attendant and tripping the ringing. When the attendant answers, a low
resistance is placed across the tip and ring conductors, which trips CO
ringing and establishes a speech path. See
call states - incoming call" (page 601)
connection sequence - incoming call" (page
Copyright © 2003-2008, Nortel Networks
.
600).
Figure 161 "Ground start call states - incoming call from CO/FX/WATS"
and Figure 162 "Ground start call connection sequence -
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Figure 157 "Ground start call
and Figure 158
606).
Figure 159 "Ground start
and Figure 160 "Ground start call
602).