PBL 3764A/4, /6
I
Loop current (mA)
L
Figure 14. Loop current as a function of
loop resistance.
35
30
25
A
VBat =-48V,RSG =4kΩ
CurveA: RDC1+RDC2=71,4kΩ
CurveB: RDC1+RDC2=83,3kΩ
CurveC: RDC1+RDC2=100kΩ
CurveD: RDC1+RDC2=125kΩ
B
C
20
15
D
500
1000 1500
Loop resistance (ohm)
2000
0
R
L
Figure 15. Tip-ring voltage as a function
of loop resistance.
V
TR Tip-Ring voltage (V)
40
VBat =-48V,RSG =4kΩ
CurveA: IConst=35mA
CurveB: IConst=30mA
CurveC: IConst=25mA
CurveD: IConst=20mA
A
B
C
D
30
20
10
0
500
1000 1500
Loop resistance (ohm)
2000
0
RL
Figure 16. Loop current as a function of
loop resistance.
I Loop current (mA)
L
50
A
VBat =-24V,RSG =∞
45
40
35
30
25
20
15
CurveA: RDC1+RDC2=50.0kΩ
CurveB: RDC1+RDC2=62.5kΩ
CurveC: RDC1+RDC2=83.3kΩ
CurveD: RDC1+RDC2=125.0kΩ
B
C
D
10
5
500
1000
1500
2000
0
R
Loop resistance (ohm)
L
Figure 17. Tip-ring voltage as a function
of loop resistance.
V
Tip-Ring voltage (V)
TR
20
VBat =-24V,RSG =∞
CurveA: IConst=50mA
CurveB: IConst=40mA
CurveC: IConst=30mA
CurveD: IConst=20mA
15
10
A
D
C
B
5
0
500
1000 1500
Loop resistance (ohm)
2000
0
R
L
13
ERICSSON [ ERICSSON ]
