TB8100 Installation Guide Installation 11
© Tait Electronics Limited February 2007
To allow enough cooling airflow through a cabinet-mounted base station,
we recommend the following:
■ an area of at least 150cm
2
(23in
2
) of unrestricted ventilation slots or holes
in front of the air intakes for the fans for each subrack; for example,
thirty 6x85mm (0.25x3.3in) slots will allow the recommended airflow
■ a vent in the top of the cabinet with an area of approximately 150cm
2
(23in
2
) per subrack, or a similar area of ventilation per subrack at the rear
of the cabinet behind each subrack
■ a 2U gap at the top of the cabinet.
Note The ventilation opening must be unrestricted. If the slots or holes
are covered with a filter, mesh or grille, the open area must be
increased to allow the same airflow as an unrestricted opening.
The maximum ambient temperature entering the cabinet must not exceed
+60°C (+140°F).
If you are installing multiple subracks in a cabinet, ensure that there will be
enough cooling airflow through the cabinet after the equipment has been
installed. For example, the recommended maximum number of subracks in
a 38U cabinet is five, as shown in Figure 1.2 on page 12.
If the TB8100 base station is installed in a rack or cabinet with other
equipment with different ventilation requirements, we recommend that the
TB8100 be positioned below this equipment.
Auxiliary Extractor
Fans
The TB8100 base station does not require auxiliary extractor fans mounted
in the top of the cabinet. If your cabinet is already fitted with fans, the
following procedures apply:
■ if there are six or more 120mm (4.75in) fans, each capable of extracting
160m
3
per hour (94.2CFM), they must run continuously
■ if there are fewer than six fans, you must remove them and ensure the
vent in the top of the cabinet has an area of approximately 150cm
2
(23in
2
) per subrack.
If you have any other configuration, the performance of your system will
depend on how closely you comply with the base station airflow
requirements described above.
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