le79r79 Zarlink Semiconductor, le79r79 Datasheet - Page 17

• Manufacturer Part Number: le79r79
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

TEST CIRCUITS
Figure 7. Four-to-Two-Wire Insertion Loss and Four-to-Four-Wire Balance Return Signal
L-T Long. Bal. = - 20 log(V
L-4 Long. Bal. = - 20 log(V
S2 Open, S1 Closed
V
AB
ωC
R
V
R
2
1
2
L
L
L
I
L4-2
S1
V
<<
L
= 20 log(V
R
R
C
L
L
Figure 6. Two-to-Four-Wire Insertion Loss
V
V
TX
AB
AB
AB
L
R
R
2
2
/ V
/ V
/ V
L
L
L
L
Figure 8. Longitudinal Balance
RX
)
)
A (TIP)
B (RING)
)
A (TIP)
B (RING)
I
L2-4
V
Zarlink Semiconductor Inc.
AB
= 20 log(V
SLIC
SLIC
A (TIP)
B (RING)
4-L Long. Sig. Gen. = 20 log(V
AGND
17
VTX
AGND
TX
R
BRS = 20 log(V
VTX
RSN
SN
/ V
SLIC
S2 Closed, S1Open
AB
)
AGND
VTX
R
SN
TX
/ V
RX
)
R
L
T
R
/ V
R
RX
T
R
RX
RX
)
S2
R
T
V
R
RX
RX
V
RX