Nortel Networks Circuit Card 311 - Manual (Page 611)

Operation 611
Figure 166
Ground start call connection sequence - outgoing call to CO/FX/WATS
For outgoing calls, the trunk provides a ground to the ring lead. The CO
responds by grounding the tip and returning dial tone. After the tip ground is
detected by the card, a low-resistance path is placed between the tip and
ring leads and the ground is removed from the ring. Addressing is then
applied from the CS 1000 in the form of loop (interrupting) dial pulses or
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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