IBM 4957-J10, Manual

Page: 18 / 70

Table 1. Declared noise emissions in accordance with ISO 9296
(1-5)
(continued)
Product description
Models: A10, C10, M10, J10,
J11 & J12
Declared A-weighted
sound power level,
L
WA,m
(B)
Declared A-
Weighted
Sound Pressure
Level,
L
pA,m
(dB)
Statistical adder for
verification
K
v
(B)
Operating Idling Operating Idling Operating Idling
Maximum configuration:
Worst-case ambient Fan failure
8.7
(6)
8.7
(6)
74 74 0.3 0.3
Notes:
1. Declared level L
WA,m
is the upper-limit A-weighted sound power level; Declared level L
pA,m
is the
mean A-weighted sound pressure level measured at the 1-meter bystander positions.
2. The statistical adder for verification, K
v
, is a quantity to be added to the declared mean A-weighted
sound power level, L
WA,m
such that there will be a 95% probability of acceptance, when using the
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
WAc
(formerly called L
WAd
), can be computed from the sum of L
WA,m
and K
v
.
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: IBM Small J10 Disk Enclosure Manual