GE 25450 - Manual (Page 15)

Connections and Setup
Two 2-line Jacks
(Using 4-Wire Line Cords Supplied)
Four 1-line Jacks
L4/Data L4/L3 L2 L2/L1
Line 1
Line 2
Line 3
Line 4
L4/Data
Line
4
L4/L3
Line
3
L2
Line
2
L2/L1
Line
1
1