Samsung Ubigate iBG3026 Configuration Manual page 497

Idle state
- The module of Analog
FXS are constantly
monitoring the
ring line for ground.
- Battery(-48 VDC) is
still connected to the
ring line just as in
loop-start signaling
- Both the tip and ring lines are disconnected from ground
1) Incoming call
2) Outgoing call
- the Analog FXS
grounds the
tip line and then
superimposes a
20-Hz 90-VAC ringing
voltage over the ring
line to alert the PBX
of an incoming call.
Figure 30.3 Ground-start signaling for Analog FXS (seizure-state)
© SAMSUNG Electronics Co., Ltd.
Analog FXS Interface or
module in submarine
Ring
Generator
Figure 30.2 Ground-start signaling for Analog FXS (Idle-state)
Analog FXS Interface or
module in submarine
Ring
Generator
Analog FXS Interface or
module in submarine
Ring
Generator
Ubigate iBG3026 Configuration Guide/Ed.00
PBX CO
Tip
-48DC
Ring
Battery
PBX CO
Tip
-48DC
Ring
Battery
PBX CO
Tip
-48DC
Ring
Battery
Tip
- The PBX are
Detector
constantly
monitoring the
tip line for ground.
- PBX grounds the
Tip
ring line to indicate
Detector
to the Analog FXS
that there is an
incoming call
Tip
Detector
455