Configuring the traffic interfaces | 92
Line Termination Impedance
The line termination impedance (Zt) is the impedance seen looking into the DFXO or DFXS interface.
The line termination impedance is not
the same as the hybrid balance impedance network (Zb) but
can be set to the same value.
Changing the DFXO / DFXS impedance setting on the Aprisa XE changes both the line termination
impedance and the hybrid balance impedance to the same value.
Hybrid Balance Impedance
The hybrid balance impedance (Zb) is the impedance network on the opposite side of the hybrid from
the DFXO / DFXS line interface. The purpose of this network is to balance the hybrid to the impedance
presented to the DFXO / DFXS line interface.
Changing the DFXO / DFXS impedance setting on the Aprisa XE changes both the line termination
impedance and the hybrid balance impedance to the same value.
Transhybrid loss
Transhybrid loss is a measure of how much analogue signal received from the remote terminal is
passed across the hybrid and sent to the remote terminal.
The transhybrid loss is maximized when the hybrid balance impedance matches the impedance
presented to the DFXO / DFXS line interface. An optimized hybrid minimizes circuit echo.
To Next Page
Loading...
