Appendix 1 - Technical Reference
P4 Connector Pin Assignments (Computer Telephony
Bus)
P4 Signal Descriptions (Computer Telephony Bus)
General
VCC
5V power
VCC3
3.3V power
V(I/O)
5V or 3.3V power
+12V
12V power
-12V
-12V power
GND
To digital signal ground plane
FG
To chassis (frame) ground
A1-13
G8 CPCI Enclosure User’s Guide
Table A1-6: P4 Connector Pin Assignments (Computer Telephony Bus)
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