AT&T 3B2/300 Technical Reference Manual page 158

EQUIPMENT D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - -
CM519B Backplane Board Layout
The CMS 198 is a 24-slot {plus system board slot) backplane board. The backplane board is
connected to the card cage assembly. The system board plugs into the middle of the backplane board.
There are 12 1/0 slots above the system board to hold a maximum of either 6 double-width or 12
single-width feature cards. There are 12 performance slots underneath the system board for cards that
improve the performance of the computer. Figure 2-40 shows the component layout of the CM519B
Backplane. The board is a multilayer board measuring 11.3 inches high and 13.0 inches wide. Card
and connector pinout information is provided in Appendix B.
r··················································
13.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,
r
DD I I I I
I I
c:::J
I I I ID
I/0 12 I/0 11
I
c:i
102
I/0 10 I/0 9
I/0 8
I/0 7
I/0 6
I/0 5
I/0 4
I/0 3
--- --- --- ---
I/0 2
I
I/01
I
~t?
I
,
SYSTEM BOARD
11.3"
PROC 1
I
MEMORY 0
PROC 2
I
MEMORY 1
PROC 3
I
MEMORY 2
--------- ---
---
---
BUB 2
I
lvlElvlOIH' ~
BUB 1
I
POWER ONLY
~
V
I BUB 0
I
I
POWER ONLY
BUS TERMINATING RESISTOR NETWORK (55)
Figure 2-40: CM519B Backplane Board Layout
2-134 TECHNICAL REFERENCE MANUAL