Appendix 1 – Technical Reference
0818D User’s Guide
A1-9
P4 Signal Descriptions (Computer Telephony Bus)(I/O
Slot)
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
SGA(4:0)
Shelf enumeration bus signals
GA(4:0)
Slot ID signals; not bussed
RSV
Reserved
pin
NP
Pin and pad to Not be
Populated
H.110 TDM Bus
CT_Dxx
H.110 TDM bus signals
(Computer
(8Mfpbs)
Telephony)
CT_C8A
8.192 MHz data clock
CT_C8_B
Redundant 8.192 MHz data
clock
CT_FRAME_A_8 kHz frame clock
CT_FRAME_B_ Redundant 8kHz frame clock
CT_NETREF_1 8kHz, 1.544MHz or 2.048MHz
telecom network timing
reference
CT_NETREF_2
Secondary
8kHz,1.544MHz
or
2.048MHz telecom network
timing reference
CT_MC
2Mbps message channel
FR_COMP_
8kHz
SCbus
compatibility
frame
clock
SCLK
8.192MHz
SCbus
compatibility data clock
SCLKx2
Skewed 8.192MHz SCbus
compatibility data clock
CT_EN_
Logical equivalent of the
CPCI signal BD_SEL_ on P1
CT_Reset
Reset for use by CT Front
Cards that do not populate P1
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