User Manual

Ericsson Internal
DESCRIPTION 10 ( 34 )
/ XSNSIXI 19/1551-LZA 701 0001 Uen
CBC/ XRX/M ( Kai Lian) 2011-05-05 G
Prepared (also subject responsible if other) No.
Approved Checked Date Rev Reference
(1) Normal operation describe the environmental conditions where all units function
as specified.
(2) Environmental stress above the limits for normal operation where all units shall
continue to function during the stress, but performance or capacity may be reduced.
When the environmental stress has dropped to normal conditions, function as
specified shall automatically be achieved. Safe function refers to a period of not
more than 72 consecutive hours, and a total of not more than 15 days in one year.
(3) Non-destructive conditions describe environmental stress above the limits for normal
conditions with no function guaranteed and unspecified degradation. When
the environmental stress has dropped to normal conditions, restoring full RBS
performance requires no manual intervention on site. Non-destructive conditions
refer to a period of maximum 96 consecutive hours, and a total of maximum 5.5
days in a three-year period.
Acoustic Dispersion
The cabinet noise dispersion for an RBS with four fans is shown in the
two figures below. The figures show the noise dispersion generated by a
free-standing cabinet and by a cabinet mounted against a wall.
Note: The acoustic noise dispersion values for a free-standing cabinet
and a cabinet installed against a wall were tested according to the
ISO 9614-2 standard, however deviations from these values may be
experienced due to the nature of materials in the environment where
the cabinet is installed. Objects may reflect or absorb sound and will
affect acoustic dispersion.