Tadiran Telecom Coral IPx 800 Series Installation Procedure And Hardware Reference Manual page 359

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3 Ringer Frequency Adjustment
The PS19 AC can supply either 20Hz or 25Hz ringing frequency by configuring
Jumper J2 located on the bottom left component side card panel. See
jumper is configured by the manufacturer according to local requirements. However, it
can be configured in the field. The procedure is as follows:
1. Remove the power supply unit from its slot and place it over the anti-static
material with the component side facing upwards, as described in
Removing the Power
Do not insert or remove the PS19 AC unit from the cage when turned ON. Sudden
power surges could damage system components.
2. Configure jumper J2 for the following frequencies:
Frequency
20 Hz
25 Hz
3. Reinstall the power supply unit as described on
Supply.
Supply.
J2 shorting plug
over pins
2 and 3
1 and 2
7-11. This
Figure
page 7-47,
page 7-46, Installing the Power
Power Supplies
7-45