Backplane - PictureTel Concorde 4500 Servicing Manual

2
Understanding the
Electronics Module
The electronics module is a self-contained unit that includes the
system electronics, system boards, system software cartridge, and
the power supply. The electronics module sits in the bottom of the
WorldCart.
This chapter focuses mainly on the system electronics, system
boards, and data ports.

Backplane

The Backplane, which sits on the bottom of the electronics module,
provides the essential signal connections that are necessary for the
system boards to communicate. From the power supply, which
plugs into the backplane, power is distributed to the system boards
and to the fans. The backplane also carries the circuitry for
interfacing with the software cartridge and for generating the
master clocks for the system.
The Backplane accommodates eight system boards, each of which
has a speciÞc slot. Functions for the backplane are mapped into the
system memory and reside in the ninth slot.
2-1