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TB9400 Installation and Operation Manual

© Tait Limited March 2015

The cooling airflow for the base station enters through the front panel and 
exits at the rear of the subrack. For optimum thermal performance, the 
heated air that has passed through a base station must not be allowed to re-
enter the air intakes on the front panel. Any space at the front of the cabinet 
not occupied by equipment should be covered by a blanking panel. Refer 
to 

To allow enough cooling airflow through a cabinet-mounted base station, 
we recommend the following:

■

an area of at least 23in

2 

(150cm

2

) of unrestricted ventilation slots or 

holes in front of the air intakes for the fans for each subrack; for 
example, thirty 0.25x3.3in (6x85mm) slots will allow the 
recommended airflow

■

a vent in the top of the cabinet with an area of approximately 23in

2

 

(150cm

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.

Notice 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 
+140°F (+60°C).

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 

.

If the base station is installed in a rack or cabinet with other equipment with 
different ventilation requirements, we recommend that the base station be 
positioned below this equipment. 

The 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 4.75in (12cm) fans, each capable of extracting 
94.2 ft

3

 per minute (160m

3

 per hour), 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 23in

2

 

(150cm

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.