+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceiver
IZ
-10V
-3V
+3V
-3.25mA
Figure 8. Receiver Input Impedance Curve
3.25mA
VZ
+10V
A′ A
R8
5kΩ
S3
R5
30kΩ
R6
10kΩ
MAX3171
MAX3173
RECEIVER
A′ A
R5
30kΩ
R8
5kΩ
R6
10kΩ
S3
MAX3171
MAX3173
RECEIVER
B′
B
R4
30kΩ
R7
10kΩ
C′
GND
Figure 9. V.11 Termination and Internal Resistance Networks
GENERATOR
UNBALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
A
A′
C
C′
Figure 10. Typical V.10/V.28 Interface
B′ B
C′
R4
30kΩ
R7
10kΩ
S5
S4
GND
Figure 11. V.10 Internal Resistance Network
A′ A
R5
30kΩ
R8
5kΩ
R6
10kΩ
S3
MAX3171
MAX3173
RECEIVER
B′ B
R7
10kΩ
R4
30kΩ
C′
GND
Figure 12. V.28 Termination and Internal Resistance Networks
______________________________________________________________________________________ 11