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Contents
Sun Netra X4250 Server Site Planning1
Physical Specifications1
Clearance for Service Access2
Environmental Specifications2
AC and DC Power Source Requirements3
Additional Power System Information3
Changing Sun Servers From AC to DC Input or From DC to AC Input4
Agency Compliance Specifications4
Operating Environment5
Electrical Power5
Ambient Temperature6
Ambient Relative Humidity6
Airflow Considerations6
Acoustic Noise Emissions7
Calculating Heat Dissipation7
NEBS Level 3 Certification7
iii
ivSun Netra X4250 Server Site Planning Guide • May 2010
Sun Netra X4250 Server Site
Planning
This guide provides the specifications and site requirements for planning the
installation of Sun Netra X4250 server from Oracle.
For safety and compliance information, refer to the Sun Netra X4250 Server Safety and
Compliance Guide, 820-4054, and the Important Safety Information for Sun Hardware
Systems, 821-1590, that came with your server.
Physical Specifications
The following are the physical specifications for the server.
DimensionServer DimensionsMeasurements
WidthBezel
Server chassis
DepthTo connector plane
Maximum overall
Height2 rack unit (2U) nominal3.44 in. (87.4 mm)
WeightServer only34.78 lbs (15.81 kg)
17.4 in. (442.0 mm)
16.75 in. (425.5 mm)
20 in. (502 mm)
20.67 in. (525 mm)
1
Clearance for Service Access
These are the minimum clearances needed for servicing the server.
DescriptionSpecification
Clearance, front of server36 inches (91 cm)
Clearance, rear of server36 inches (91 cm)
Environmental Specifications
These are the environmental specifications for the AC and DC versions of the server.
SpecificationOperatingNonoperating
Ambient temperature
Relative humidity10% to 90% noncondensing, short term
Elevation (Sun requirement)Maximum 9840 feet (3000 meters) at
Elevation (NEBS requirement)-200 feet to 5900 feet (-60 meters to 1800
VibrationDC servers: 0.1G, 5-100 Hz, 0.1 Oct/min
ShockDC servers: Operating 30 m/s2, 11msec
SeismicAC server only: Zone 4Not applicable
*
41˚F to 104˚F (5˚C to 40˚C) up to 6000
feet (1829 meters)
25˚F to 113˚F (-5˚C to 55˚C)
5% to 90% noncondensing, but not to
exceed 0.024 kg of water per kg of dry
air (0.053 lbs. water/2.205 lbs. dry air)
104˚F (40˚C)
meters) at 104˚F (40˚C)
5900 feet to 13100 feet (1800 meters to
4000 meters) at 86˚F (30˚C)
AC servers: 0.1G (x,y axes); 0.15G (z
axis), 5-500 Hz, 1 Oct/min
half-sine
AC servers: 3G, 11msec half-sine
†
–40˚F to 158˚F (–40˚C to 70˚C)
Up to 93% noncondensing 100.4˚
(37.7˚C) maximum wet bulb
Maximum 39370 feet (12000
meters)
DC servers: 0.1G, 5-100 Hz, 0.1
Oct/min
AC servers: 0.25G (x,y axes); 0.5G
(z axis), 5-500 Hz, 1 Oct/min
DC servers: Operating 30 m/s2,
11 msec half-sine
AC servers: 1 in. roll off front to
back, 0.5 in. roll off side to side,
20 mm step-up
2Sun Netra X4250 Server Site Planning Guide • May 2010
* Does not apply to removable media devices.
† Maximum ambient operating temperature is derated by 1 degree C per 500m elevation.
AC and DC Power Source Requirements
The server has two hot-swappable power supplies. Both the AC and the DC power
supplies are capable of current sharing. To ensure redundant operation of the power
supplies, connect the two power cords to separate circuits.
The following table shows the electrical limits and ranges for the server.
ParameterAC Version RequirementDC Version Requirement
Voltage (nominal)100-120/200-240 VAC-48 or -60 VDC (-40 to -75 VDC range)
Input current (maximum)8.2 A19 A
Frequency50/60 HzN/A
DC Input TreatmentN/AIsolated DC Return (DC-1)
Note – The DC power source must be reliably connected to ground.
Additional Power System Information
The total input power for the system is divided equally among the power supplies
in operation. Reversing the positive and negative inputs to the power supplies of a
DC input system will not cause damage. However, the power supplies with reversed
input will not operate.
The inputs to a power supply are isolated from the system chassis and the other
power supply inputs. The AC or DC power inputs may be at different voltages
within the acceptable range and may have different offset voltages relative to the
system chassis.
Sun Netra X4250 Server Site Planning3
Changing Sun Servers From AC to DC Input or
From DC to AC Input
Safety agency requirements prohibit Sun Microsystems from changing a product
from AC input to DC input or from DC input to AC input after the product has been
removed from the agency approved manufacturing site.
Agency Compliance Specifications
The server complies with the following specifications.
CategoryRelevant Standards
SafetyUL/CSA-60950-1
EN60950-1
IEC60950-1 CB Scheme with all country deviations
IEC825-1, 2
CFR21 part 1040
CNS14336,
GB4943
ErgonomicsEK1-ITB-2000
RFI/EMCEN55022 Class A
47 CFR 15B Class A
ICES-003 Class A
VCCI Class A
AS/NZ 3548 Class A
CNS 13438 Class A
KSC 5858 Class A
GB9254 Class A
EN61000-3-2
GB17625.1
EN61000-3-3
4Sun Netra X4250 Server Site Planning Guide • May 2010
Your environmental control system must provide intake air for the server which
complies with the limits specified in “Environmental Specifications” on page 2.
To avoid overheating, do not direct warmed air:
■ Toward the front air intake of the server
■ Toward the server access panels
Note – When you receive your server, place it in the environment in which you will
install it. Leave the server in its shipping crate at its final destination for 24 hours.
This resting period prevents thermal shock and condensation.
The server has been tested to meet all functional requirements when operating in the
operating environmental limits presented in “Environmental Specifications” on
page 2. Operating computer equipment in extremes of temperature or humidity
increases the failure rate of hardware components. To minimize the chance of
component failure, use the server within the optimal temperature and humidity
ranges.
Electrical Power
Good practice is to connect each power supply to a separate circuit, which enables
the server to remain operational if one of the circuits fails. Consult your local
electrical codes for any additional requirements.
Sun Netra X4250 Server Site Planning5
Ambient Temperature
An ambient temperature range of 21˚C (69.8˚F) to 23˚C (73.4˚F) is optimal for server
reliability. At 22˚C (71.6˚F) it is easy to maintain safe relative humidity levels.
Operating in this temperature range provides a buffer if the environmental support
systems fail.
Ambient Relative Humidity
Ambient relative humidity levels between 45% and 50% are the most suitable for
data processing operations in order to:
■ Prevent corrosion
■ Provide an operating time buffer in the event of environmental control system
failure
■ Help avoid failures caused by the intermittent interference from static discharges
that occur when relative humidity is too low
Electrostatic discharge (ESD) is easily generated and less easily dissipated in areas
where the relative humidity is below 35%, and becomes critical when levels drop
below 30%.
Airflow Considerations
■ Ensure unobstructed airflow through the chassis. The server uses internal blowers
that can achieve a total airflow of 120 CFM (3.4 m
conditions.
■ Ensure that inlet air enters at the front of the server and exits from the back.
■ Ensure that ventilation openings such as cabinet doors, for both the inlet and
exhaust of the server, provide a minimum open area of 35.5 in.
This size equates to a 60% open area perforation pattern across the front and rear
area of the server 17.4 in. x 3.4 in. (442 mm x 87.1 mm). The impact of other open
area characteristics that are more restrictive. You must evaluate.
■ Ensure that front and rear clearance of the server allow a minimum of 0.2 in. (5
mm) at the front of the server and 3.15 in. (80 mm) at the rear of the server when
mounted. These clearance values are based on the inlet and exhaust impedance
(available open area) stated in the third bullet assume a uniform distribution of
the open area across the inlet and exhaust areas. These values also improve
cooling performance.
6Sun Netra X4250 Server Site Planning Guide • May 2010
3
/) in normal operating
2
(231 cm2) each.
Note – The combination of inlet and exhaust restrictions such as cabinet doors and
the spacing of the server from the doors can affect the cooling performance of the
server. You must evaluate these restrictions. The server placement is particularly
important for high-temperature NEBS environments where the server inlet ambient
temperature is 55˚C (131˚F). (The DC-powered server is NEBS compliant.)
■ Take care to prevent recirculation of exhaust air within a rack or cabinet.
■ Manage cables to minimize interference with the server exhaust vent.
■ Ensure that air temperature rise through the server is no greater than 68˚F (20˚C).
Acoustic Noise Emissions
The acoustic noise emissions on the server are as follows:
ParameterOperatingIdling
Acoustic power LWAd (1B=10dB)7.3 B7.3 B
Declared noise emissions are in accordance with ISO 9296 standards.
Calculating Heat Dissipation
To calculate the heat generated by a server so that you can estimate the heat your
cooling system must dissipate, convert the figure for the server ’s power requirement
from Watts to BTU/hr. A general formula for doing this is to multiply the power
requirement figure in Watts by 3.412.
NEBS Level 3 Certification
Telcordia certified that the DC-powered version of the server meets NEBS Level 3
requirements per SR-3580, including the appropriate sections of GR-63-CORE
(Network Equipment-Building System Requirements: Physical Protection) and
GR-1089-CORE (Electromagnetic Compatibility and Electrical Safety – Generic Criteria forNetwork Telecommunications Equipment).
Sun Netra X4250 Server Site Planning7
Caution – To maintain NEBS compliance, the network management (NET MGT)
Ethernet port and the RJ-45 serial management (SER MGT) port must use shielded
cables, and both ends of the shield must be grounded.
8Sun Netra X4250 Server Site Planning Guide • May 2010
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