Specifications

Chapter 5 12-Channel FXO & Dial Pulse Termination
5-2
Table 6-1: Termination Options and Switch Settings for the FXO/DPT
Trunk Signaling 4-Position DIP Switch
per Card
Slide Switch
per Channel
FXO Ground Start 0000 GS
FXO Loop Start 0000 LS
DPT 1000 LS
FOREIGN EXCHANGE OFFICE (FXO) TERMINATION
CO
FXO FXS*
PBX
Incoming
Outgoing
T1
Figure 6-1: FXO Operation
The FXO provides private branch exchange (PBX) office end connectivity to public network T1 lines.
Functionally, the FXO acts as a “sink” for a battery source, detects ringing, provides outgoing seizure,
provides/interprets A/B bit signaling to/from the T1 line, and enables two-way voice frequency transmission.
4-Position DIP Switch
per Card
Slide Switch
per Channel
1
LS
ON
GS
0
Figure 6-2: FXO Loop Start Switch Settings
Slide Switch
per Channel
LS
GS
1
ON
0
4-Position DIP Switch
per Card
Figure 6-3: FXO Ground Start Switch Settings