Nortel Passport 4460 Hardware Reference Manual page 64

64 Chapter 3 Expansion Modules
The FXS Voice Expansion Module has a default ring voltage set to 40 VRMS per
channel. To allow for a 50 VRMS per channel you must change the pin settings on
jumpers J2, J3, J15, J16 (see chart and illustration below). To change the voltage
setting to 50 VRMS, remove the jumpers from pins 1 and 2 and place them on
pins 2 and 3 for each channel.
Channel
1
2
3
4
Pin 1
Pin 2
Pin 3
205677-F Rev 00
Caution: The FXS Voice Expansion Module is very sensitive to
damage from improper handling or wrong settings. These settings should
be done when the FXS module is outside the Passport 4460 unit and
must be done by a qualified technician.
Jumper Position for
Jumper
40 VRMS (default)
J3 Pins 1 and 2
J15 Pins 1 and 2
J2 Pins 1 and 2
J16 Pins 1 and 2
Pin 1
Pin 2
Pin 3
Jumper Position for
50 VRMS
Pins 2 and 3
Pins 2 and 3
Pins 2 and 3
Pins 2 and 3