6 BOARDS AND MODULES
Each product comprises a selection of PCBs (Printed Circuit Boards) and subassemblies, depending on the chosen
configuration.
6.1 PCBS
A PCB typically consists of the components, a front connector for connecting into the main system parallel bus via
a ribbon cable, and an inter
face to the rear. This rear interface may be:
● Directly presented to the outside world (as is the case for communication boards such as Ethernet Boards)
● Presented to a connector, which in turn connects into a terminal block bolted onto the rear of the case (as is
the case for most of the other board types)
Figure 9: Rear connection to terminal block
6.2 SUBASSEMBLIES
A sub-assembly consists of two or more boards bolted together with spacers and connected with electrical
connectors. It may also have other special requirements such as being encased in a metal housing for shielding
against electromagnetic radiation.
Boards are designated by a part number beginning with ZN, whereas pre-assembled sub-assemblies are
designated with a part number beginning with GN. Sub-assemblies, which are put together at the production
stage, do not have a separate part number.
P54A/B/C/E Chapter 3 - Hardware Design
P54xMED-TM-EN-1 41
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