Limit the signal-line chatter period to 1ms or less.

2.2.4.2 Output Circuit

2.2.5 UPS Cable

The UPS cable specifications are as follows:

• Connector type
• D-SUB9 pin Male (install side: Female)
• DEU-9PF-F0

• Terminal array

FIGURE 2-5 identifies pin signals of the UPC connector and the UPS cable.

Do not use the unused pins (pin number 2, 3, 4 and 8 in the following diagram). Cable side shown in FIGURE 2-5.

FIGURE 2-5 Corresponding Terminals in UPC Port and the UPS Cable

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2.3 Environmental Requirements

Both midrange servers can be installed in an environment with the operating ranges shown in TABLE 2-4.

The design of your environmental control system--such as computer room air-conditioning units--must ensure that intake air to the servers complies with the limits specified in this section.

To avoid overheating:

• Guard against directing any warm air toward the front of the equipment rack.
• Guard against directing warm air toward the server air intake.

TABLE 2-4 lists the environmental requirements.

The environmental requirements listed in TABLE 2-4 reflect the test results of the server. The optimum conditions indicate the recommended operating environment. Operating the server for extended periods at or near the operating range limits or installing the server in an environment where it remains at or near the non-operating range limits could possibly increase the failure rate of hardware components significantly. In order to minimize the occurrence of system failure due to component failure, set temperature and humidity in the optimal ranges.

2.3.1 Ambient Temperature

The ambient temperature range of 21°C to 23°C (70°F to 74°F) is optimal for server reliability and operator comfort levels. Most computer equipment can operate within a wide temperature range, but a level near 22°C (72°F) is desirable because it is easier to maintain safe associated relative humidity levels at this temperature. Operating in this temperature range provides a safety buffer in the event the air conditioning systems go down for a period of time.

2.3.2 Ambient Relative Humidity

Ambient relative humidity levels between 45 percent and 50 percent are the most suitable for safe data processing operations. Most data processing equipment can operate within a fairly wide environmental range (20 percent to 80 percent), but the optimal goal should be between 45 percent to 50 percent for the following reasons:

• Optimal range helps protect computer systems from corrosivity problems associated with high humidity levels.
• Optimal range provides the greatest operating time buffer in the event of an air conditioner control failure.
• This range helps avoid failures or temporary malfunctions caused by intermittent interference from static discharges that might 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 percent. ESD becomes critical when humidity levels drop below 30 percent. The 5 percent relative humidity range might seem unreasonably tight when compared to the guidelines used in typical office environments or other loosely controlled areas. However, it is not as difficult to maintain in a data center because of the high efficiency vapor barrier and low rate of air changes normally present.

2.3.3 Contamination Specifications

The allowable comtaminations in the M4000/M5000 servers are listed in TABLE 2-5.

2.3.4 CPU Types and Server Maximum Power Consumption

This section describes the CPU types and the maximum power consumption of the server.

There are four types of CPU. The power specifications of the M4000 and M5000 servers vary depending on the CPU type and the system configuration.

TABLE 2-6 and TABLE 2-7 list the specifications of maximum power consumption, apparent power, and heat dissipation by the type of CPU. The figures represent the system configuration described below the tables, in which every CPU Modules (CPUM) is mounted with the same CPU.

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2.4 Electrical and Cooling Specifications

This section provides guidelines and requirements for cooling the midrange servers. See TABLE 2-8 for the electrical and cooling specifications.

Be aware of the following server cooling rules and guidelines:

• The room should have sufficient air-conditioning capacity to support the cooling needs of the entire server.
• The air-conditioning system should have controls that prevent excessive temperature changes.

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2.5 Airflow and Heat Dissipation

The maximum rate of heat release from fully configured midrange servers is listed in TABLE 2-10.

Both midrange servers have been designed to function while mounted in a natural convection airflow. The following rules must be followed to meet the environmental specification.

• Ensure adequate airflow through the server.
• The M4000 server uses internal fans that can achieve a total airflow of 300 cubic feet of air per minute (cfm)/8.5 cubic meter per minute in normal operating conditions.
• The M5000 server uses internal fans that can achieve a total airflow of 600 cfm/ 16.99 cubic meter per minute in normal operating conditions.

• The server has front-to-back cooling. The air inlet is at the front of the server. The exhaust exits from the rear of the server.
• Allow a minimum clearance of 36 inches (914 mm) at the front and 914 mm
  (36 inches) at the rear of the server for adequate ventilation.

Ensure that additional equipment installed in the equipment rack does not exceed environmental limits at the air inlet. The environmental limits assume the server is operating in the equipment rack with ventilated doors closed.

2.5.1 Airflow Indicator

The airflow indicator indicates the amount of air exhausted from the server while the M4000/M5000 servers are up and running. The values do not include the peripheral devices. To display the amount of exhaust air, use the showenvironment air command.

XSCF> showenvironment air
Air Flow:294 CMH

For details of the showenvironment(8) command, refer to the man page. For installation details of the M4000/M5000 servers, see the SPARC Enterprise M4000/M5000 Servers Site Planning Guide and the SPARC Enterprise M4000/M5000 Servers Installation Guide.

You can also obtain the exhaust air data using the SNMP agent function. To obtain the data of exhaust air using the SNMP agent function, install the latest XSCF extension MIB definition file to the SNMP manager. For details on the XSCF extension MIB definition file, see the SPARC Enterprise M3000/M4000/M5000/M8000/M9000 Servers XSCF User’s Guide

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2.6 Facility Power Requirement

To prevent catastrophic failures, the design of your power system must ensure that adequate power is provided to your midrange servers. Use dedicated AC breaker panels for all power circuits that supply power to your server. Electrical work and installations must comply with applicable local, state, or national electrical codes.

2.6.1 Circuit Breaker Capacity and Characteristics

Qualified equipment racks housing these midrange servers require their own customer-supplied circuit breaker and AC receptacle for each power cord. Provide a stable power source, such as an uninterruptible power system (UPS), to reduce the possibility of component failures. If the computer equipment is subjected to repeated power interruptions and fluctuations, it is susceptible to a higher component failure rate than it would be with a stable power source.

2.6.2 Grounding

Both midrange servers are shipped with grounding-type (three-wire) power cords. Always connect the cords into grounded power outlets. Each power cord will also supply your server with proper earth ground.

Contact your facilities manager or a qualified electrician to determine what type of power is supplied to your building.