Nortel Networks 1000 - Manual (Page 527)

Operation 527
Figure 150
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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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