THOMSON Amethyst III, Руководство пользователя, Страница: 43 / 306

Chapter 2 ’Installation and Startup’ — Mounting in Rack
Amethyst III DTV Smart Switch 43
User Manual
In order to know the hardware version of your equipment you shall check
its PART NUMBER on the sticker located on the left side of the equipment
or indicated in the
About box in the GUI.
Table 2-2. Air flow direction according to part number of the equipment
Part number Air flow direction (seen from front)
TNM-72XX (old platform) right to left (air extraction on the left side)
NAMBXX (new platform) left to right (air insertion on the left side)
Do not mix in the same rack platforms with inverted air flow
directions. This would cause hot air from one device being
introduced into other devices, resulting in a device fail-over.
 Prevent hot air from one device being introduced into other devices.
 Ensure adequate distribution of air flows to the device intakes.

Avoid the effects of natural convection between devices.
 Avoid hot/cold air short-circuits.
 Avoid transverse effects in coupled racks.
 Prevent hot air from accumulating in the rack.

Check the air flows: the rack should ensure a sufficient supply of cold
air and sufficient evacuation of hot air (according to the number of
devices mounted in the rack and their corresponding air flows).
The following important requirements should be added to the general
recommendations:
 The device must be installed in a room with low dust levels. The
maximum density of dust in the air must not exceed 100μg/m
3
and the
maximum number of particles with a diameter greater than 1μm must
not exceed 1 million/m
3
. To prevent the power supply from
overheating, remember to regularly clean the rack filter according to
the manufacturer’s recommendations and clean Amethyst III air inlet
grill (at least twice a year).
 There must be enough room for a column of cold air to circulate on
the right of the chassis, from the bottom to the top of the rack and a
column of hot air to circulate on the left of the chassis, from the
bottom to the top of the rack.
 Cut the L-profiles so as they do not exceed 4 mm in height in the areas
facing equipment air inlet and outlet. This will prevent any hot air from
accumulating in the device.
 Given its exact 1RU height, Amethyst III can be placed on top of
another Amethyst III or other 1RU equipment without an L-profile. It is
however advisable to observe the following restrictions: