Nortel Circuit Card Installation Manual page 109

Ring ground switches
A set of four DIP switches selects which Ring lines are connected to ground
(see Table 19).
Table 19
Ring ground switch settings
Switch
1
2
3
4
Description
Trunk 0 Transmit
Trunk 0 Receive
Trunk 1 Transmit
Trunk 1 Receive
Option settings
S2 switch setting
off - Ring line is not grounded
on- Ring line is grounded
off - Ring line is not grounded
on - Ring line is grounded
off - Ring line is not grounded
on - Ring line is grounded
off - Ring line is not grounded
on - Ring line is grounded
Circuit Card Description and Installation
Page 109 of 906