AT&T 3B2/300 Technical Reference Manual page 131

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CM518A System Board
CM518A System Board Layout
Figure 2-25 shows the layout of the component side of a typical CM518A System Board. The
system board is a multilayer board measuring 14.8 inches wide by 7.7 inches deep. All system board
interfaces are connectorized as follows:
• CONSOLE and CONTTY RS-232C Ports (J4 and JS)
• Alternate CONSOLE and CONTTY RS-232C Ports (Jl)
• Backplane Connector (J2)
• Battery Connector (J3).
The following major components on the system board are connectorized:
• Read Only Memory (ROM) (four Dual Inline Packages)
• 82HS321A Integrated Circuit (Artmaster 2 only).
EQUIPMENT DESCRIPTION 2-107