Nortel Circuit Card Installation Manual page 576

Page 576 of 906
Figure 117
Ground start call states – incoming call from CO/FX/WATS
Note 1: The far end may reverse battery and ground upon receipt of attendant answer.
Note 2: The near end provides a high-impedance (>150k ohms) disconnect signal of at
least 50 ms before reconnecting the ground detector.
553-3001-211 Standard 3.00
NT8D14 Universal Trunk card
High-resistance loop
Near end
disconnects
Idle
Far end
disconnects
Ringing
Far end
originates
For trunks not equipped with answer supervision, the PIP class of service is
enabled and call-duration recording begins immediately upon near-end trunk
seizure. The PSP and PIP classes of service are enabled in the Trunk
Administration program LD 14.
August 2005
System (near) end
Near end
disconnects
first (Note 2)
Assignment
to loop key
Low-resistance loop
far end
disconnects
Near end
answers,
ringing is
removed
(Note 1)
553-AAA1133
first