ANSI/VITA 46.0, VPX Baseline Standard
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importance of the permission. The lower-case “may” words are reserved exclusively for stating
permissions in this standard and are not used for any other purpose.
Observation <chapter>-<number>:
Observations do not offer any specific advice. They usually follow naturally from what has just
been discussed. They spell out the implications of certain rules and bring attention to things that
might otherwise be overlooked. They also give the rationale behind certain rules so that the
reader understands why the rule must be followed.
1.3.2 VITA 46 Definitions
The following terms are used within the body of the specification. In this context, they have the
following meanings.
Term Definition
2-level maintenance (Two
Level Maintenance)
A maintenance system where plug in modules are the field
replaceable units; a subset of whose requirements are that
the module provides both mechanical and ESD protection.
Air cooled a plug-in module which is intended to have heat removed
by transfer to an air stream flowing over the module
Chassis Ground See Safety Ground.
Conduction cooled a plug-in module which is intended to have heat removed
by transfer to the chassis through mechanical contact with a
chassis component
Dedicated System A system designed for a single use or application; not
available to general users. Such a system will usually
embody a feature which precludes full compliance with this
standard.
Differential Wafer A wafer designed for the connection of high speed (up to 5
GBaud) signaling intended for use with differential pair
signals, such as LVDS.
ESD Electrostatic discharge.
Ground Unless otherwise specified the term Ground means logic
ground or signal ground, not safety ground. Also referred to
as RF Ground. See Safety Ground and RF Ground.
HP Horizontal Pitch of 5.08 mm or 0.2 inch (see IEEE 1101.1-
1998). Thus 4HP = 0.8 inch pitch.
MultiGig RT2 7-Row A family of connectors, or their equivalent, used in VITA
46 systems for high speed interconnections.
Power Wafer A wafer providing two contacts which are intended to be
used to supply prime power to a plug-in module.
RF Ground A distributed low impedance common reference between
plug-in module circuitry/shields and other electrical
equipment (rack, other plug-in modules, and power
sources). See Safety Ground and Ground.