IBM Medium J11 Hardware Installation And Maintenance Manual page 18

Table 1. Declared noise emissions in accordance with ISO 9296
Product description
Models: A10, C10, M10, J10,
J11 & J12
Maximum configuration:
Worst-case ambient Fan failure
Notes:
1. Declared level L
mean A-weighted sound pressure level measured at the 1-meter bystander positions.
2. The statistical adder for verification, K
sound power level, L
verification procedures of ISO 9296, if no more than 6.5% of the batch of new equipment has A-
weighted sound power levels greater than (LWA,m + Kv).
3. The quantity L
4. All measurements made in conformance with ISO 7779 and declared in conformance with ISO 9296.
5. B, dB, abbreviations for bels and decibels, respectively. 1 B = 10 dB.
6. Notice: Government regulations (such as those prescribed by OSHA or European Community
Directives) may govern noise level exposure in the workplace and may apply to you and your server
installation. The actual sound pressure levels in your installation depend upon a variety of factors,
including the number of racks in the installation; the size, materials, and configuration of the room
where you designate the racks to be installed; the noise levels from other equipment; the room
ambient temperature, and employees' location in relation to the equipment. Further, compliance
with such government regulations also depends upon a variety of additional factors, including the
duration of employees' exposure and whether employees wear hearing protection. IBM recommends
that you consult with qualified experts in this field to determine whether you are in compliance with
the applicable regulations.
xviii IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual
Declared A-weighted
sound power level,
L
Operating
(6)
8.7
is the upper-limit A-weighted sound power level; Declared level L
WA,m
v
such that there will be a 95% probability of acceptance, when using the
WA,m
(formerly called L
WAc WAd
(1-5)
Declared A-
Weighted
Sound Pressure
(B)
WA,m
L
pA,m
Idling Operating
(6)
8.7 74
, is a quantity to be added to the declared mean A-weighted
), can be computed from the sum of L
(continued)
Statistical adder for
verification
Level,
(dB)
Idling Operating
74 0.3
pA,m
and K
WA,m
K (B)
v
Idling
0.3
is the
.
v