User Manual

Configuring the traffic interfaces | 100
14. The DFXS Signalling Advanced options are used to control the four CAS bits ABCD in the DFXO
to DFXS direction of transmission and one CAS bit A in the DFXS to DFXO direction of
transmission. This option sets the signalling for both
DFXS card ports.
Transparent Normal mode is used for normal traffic and Transparent Inverted mode can be used
for special signalling requirements when a function needs to be reversed e.g. to change the idle
polarity of the DFXS line feed voltage.
Forced modes are used to disable particular functions e.g. when polarity reversals are not
required. They can also be used for system testing e.g. to apply DFXS continuous ringing output
Selection Description
Transparent Normal Normal transparent transmission of the CAS bit Default
Transparent
Inverted
Transparent transmission of the CAS bit but inverts the
polarity.
Forced Normal Sets the CAS bit to 1 (inactive).
Forced Inverted Sets the CAS bit to 0 (active).
DFXO to DFXS
CAS Bit Forced Normal Forced Inverted
A bit (fault) Sets the CAS A bit to 1
continuous fault state
Sets the CAS A bit to 0
no fault state
B bit (ring) Sets the CAS B bit to 1
no DFXS ringing output.
Sets the CAS B bit to 0
continuous DFXS ringing output.
C bit (billing) Sets the CAS C bit to 1
no DFXS billing tone output.
Sets the CAS C bit to 0
continuous DFXS billing tone output.
D bit (reversal) Sets the CAS D bit to 1
no DFXS polarity reversal
Sets the CAS D bit to 0
continuous DFXS polarity reversal
DFXS to DFXO
CAS Bit Forced Normal Forced Inverted
A bit (off hook) Sets the CAS A bit to 1
no DFXO off hook
Sets the CAS A bit to 0
continuous DFXO off hook
15. Once the DFXS card has been set up, you can ensure optimal performance by plugging in the
telephone (on-hook), and selecting Recalibrate from the Calibrate drop-down menu. This
calibrates the DFXS to the line length.
16. Click Apply to apply changes or Reset to restore the previous configuration.