unit.
•An open area of at least 50 cm2 per tray of ventilation slots or louvres in front
of the air intakes for the fans of each unit; e.g. ten 6 x 85 mm slots will allow the
recommended airflow.
•An open area of at least 50 cm2 per tray of ventilation slots or louvres to the
rear of each tray or in the top of the rack.
•A 2U gap at the top of the rack.
Note.
The ventilation openings must be unrestricted. If the openings are covered with a
filter or grille, the open area must be increased in order to provide the same airflow
as unrestricted openings.
If the SDB680 Base Station is installed in a rack or cabinet with other equipment that
has different ventilation requirements, it is recommended that the SDB680 be
positioned below this equipment.
If multiple bases are fitted in a rack, auxiliary extractor fans may be required to ensure
that adequate cooling is provided.
If any other configuration is employed, the performance of the system will depend on
how closely you comply with the airflow requirements described above.
In a wall mount installation, it is recommended that at least 20 cm of clear space is
allowed above and below the equipment for ventilation.
Equipment rooms as a whole should be checked for adequate ventilation so that they
do not overheat.
Correct operation of internal fans should be checked prior to completion of the
installation.
Any secondary ventilation equipment (rack fans, grills etc.) should be checked for
correct operation and to ensure that they are free from blockage. Filters are not
recommended on enclosures unless they can be regularly maintained.
MOUNTING LOCATION
A clean and dry location that meets the above ventilation requirements should be
chosen for mounting the equipment. The unit should not be sited where it will be
exposed to long periods of direct sunlight.
Provision should be made for bringing the antenna feeder(s), IP cables, station earth
and the DC supply leads to the installation. These cables must be firmly anchored, in
accordance with good installation practice and comply with all local mandatory wiring
requirements.
Doc Number:
TNM-I-E-0046 ISSUE 1.2
Page
25
