DEC 4000 Model 200 Operation Manual page 21

Ba430
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The number and type of modules installed in your system depend on your
configuration. Each Q-bus slot, even an empty one, is protected by a module
cover. The purpose of the shield is as follows:
To protect external devices from electrical interference generated by the
system
To protect the system from electrical interference generated by external
devices
To maintain air flow integrity
CAUTION: Do not operate the system without Digital-supplied module
covers.
The covers are required to protect the equipment and to meet
international regulatory standards. Do not substitute other module covers,
as they may not meet the required specifications.
Operating the system without the module covers has the following
consequences:
The system may overheat due to improper air circulation.
The system will not comply with FCC and VDE requirements for
electrostatic shielding and may produce electrical interference that
affects other equipment.
The system is susceptible to electrical interference or damage from
external sources.
The design of the module covers varies, depending on the type of module
installed in the slot. Modules requiring external cable connections, such as
communications controllers, have recessed covers that are riveted directly
to the module. The recessed module covers allow space for connecting
cables. Modules requiring no external cable connections are covered by
flush covers. Empty slots are also covered by flush covers, which may be
single or double width. All covers, except those covering empty slots, have
a label identifying the module installed in the slot.
Cables connecting your system to peripheral devices (such as terminals,
modems, and printers) are attached to communications controllers. Each
cable can contain multiple lines. The cables run under the BA430 enclosure
and out the back or side of the enclosure, where the cables are split into
individual lines. Chapter 3 describes these connections in more detail.
System Overview
1–11

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Vax 4000 model 200Ba430

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