Operation - Ground Start - Mitel SX-200 Practices

Circuit Card Descriptions
The Trunk Card recognizes an incoming call when it receives ringing voltage or battery
reversal from the CO. The Trunk Card will respond by placing a termination across Tip
and Ring. The trunk is released when the loop current is broken. This happens when
the near party goes on-hook or the line is physically broken.
Operation - Ground Start
9.5 To place an outgoing call, the Trunk Card grounds the Ring lead. The CO responds
by grounding the Tip lead. The Trunk then places a termination across Tip and Ring
and ungrounds the Ring lead. The CO then sends dial tone, indicating that it is ready
' to receive dialing.
The Trunk Card recognizes an incoming call when the CO grounds the Tip lead. The
CO may also send ringing voltage. TheTrunk Card will respond by placing atermination
across lip and Ring. The trunk is released when the loop current is broken. This
happens when either party goes on-hook or the line is physically broken.
M4FiKED END
SRDWN FOR
LCOP STM TRUMA
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l-- -------l-------;--------; .
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- TRUNK 1
- TRUNK 2
- TRUNK 3
- TRW%4
- TRUtK5
- TRW% 6
NAMFIM
clxll3
125 9-2
Figure Q-l Loop Start/Ground Start Card and Jumper Location
Revision 0 9109496-l 25-NA Issue l