Nortel Networks 1000 - Manual (Page 514)

514 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
Figure 141 "Ground start call
states - incoming call from CO/FX/WATS" (page 515) and Figure 142
"Ground start call connection sequence - incoming call from CO/FX/WATS"
(page 516)
.
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 Figure 145 "Ground start call states - incoming call from
CO/FX/WATS" (page 520) and Figure 146 "Ground start call connection
sequence - incoming call from CO/FX/WATS" (page 522) .
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
Figure 143 "Ground start
call states - incoming call" (page 517) and Figure 144 "Ground start call
connection sequence - incoming call" (page 518) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.