10
Standalone G-Converter
SALES: 0118 965 5100
G.703 Interface Presentation
The converter may be configured to operate on either a 120 ohm balanced circuit impedance,
presented on an RJ45 connector or with a 75 ohm unbalanced impedance, presented on two
BNC connectors.
Selection of the interface is made by link settings – refer to
Appendix D -Location Of
Switches and Links
for the location diagram and use in conjunction with the tables below.
75 ohm operation
LINK
NUMBER
FUNCTION SETTING
LK1
Connects BNC TX
Fitted (ensure shorted pins run
front to back of unit)
LK5
Connects BNC RX
Fitted (ensure shorted pins run
front to back of unit)
LK3
Determines TX transformer
ratio
Positions 2 and 1
LK4
Determines RX transformer
ratio
Positions 2 and 1
LK6
AC couples screen of RX
BNC to gnd
Position 2 and 3 for coupling *
Position 1 and 2 for no coupling*
LK2
AC couples screen of TX
BNC to gnd
Position 2 and 3 for coupling*
Position 1 and 2 for no coupling*
Notes:
*This setting is application dependent. Only one end of each link should be grounded to
prevent ground loops, therefore the position of these links needs to made in conjunction with
the installation grounding scheme.
120 ohm operation
LINK
NUMBER
FUNCTION
LINK SETTING
LK1
Connects BNC TX
Remove
LK5
Connects BNC RX
Remove
LK3
Determines TX transformer
ratio
Positions 2 and 3
LK4
Determines RX transformer
ratio
Positions 2 and 3
LK6
AC couples screen of RX
BNC to gnd
Position 1 and 2 for no coupling
LK2
AC couples screen of TX
BNC to gnd
Position 1 and 2 for no coupling
