IBM System Cluster 1350, Инструкция по установке и обслуживанию

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Appendix D. Declaration of IBM product noise emission
values
General noise emission values for the Cluster 1350 are shown in Table 3.
Table 3. General noise emission values for the Cluster 1350
Declaration of IBM product noise emission values
Product
configuration
Declared A-weighted sound
power levels L
WAd
(B)
Declared A-weighted sound
pressure level L
pAm
(db) at 1 meter
bystander position
Cluster 1350
(fully configured
racks)
8.0 (bels)
operating
8.0 (bels) idling 62 (db)
operating
62 (db) idling
Note: L
WAd
is the declared (upper limit) sound power level for a random sample of
machines. L
pAm
is the mean value of the A-weighted sound pressure levels at the bystander
(1 - meter) positions for a random sample of machines. All measurements are made in
accordance with ISO 7779 and declared in conformance with ISO 9296.
Noise emission values are different for racks that contain BladeCenter units. Each
BladeCenter unit has two blowers for cooling. An optional acoustics module is
available that dampens the noise generated by the blowers. Table 4 shows the
maximum sound levels emitted by BladeCenter units without the acoustics module
and with the acoustics module. This represents the minimum and maximum
number of BladeCenter units that can be installed in a 42-U rack.
Table 4. Noise emission values for racks containing BladeCenters
Number of
BladeCenter units
per rack
Maximum sound
power idle
Maximum sound
power operating
Without acoustics
module
1 7.4 bels 7.4 bels
With acoustics
module
1 6.9 bels 6.9 bels
Without acoustics
module
4 8 bels 8 bels
With acoustics
module
4 7.5 bels 7.5 bels
Without acoustics
module
6 8.2 bels 8.2 bels
With acoustics
module
6 7.7 bels 7.7 bels
© Copyright IBM Corp. 2007
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