Addendum to the

This addendum to the Density Series Systems Installation and Operation Guide documents the following:

• Density MIBs and Possible Group Configurations – support PCI/ISA bus extension via SP Series Boards, DP Series Boards and CP Series processor boards.

• Density Drawer Spacing Precautions – If Density drawers are added to an existing 1010 Cabinet or another standard RETMA rack mountable cabinet, caution must be taken to space the Density drawers properly for adequate cooling to preserve the longevity of the system.

Cubix supplies four separate Master Interconnect Boards (MIBs) to satisfy the various group configurations. The various group configurations support the different types of Density Series processor boards, and PCI and ISA slots.

Table 1 displays the MIB configurations available in the Density Series Systems.

*DP Density Series backplanes can have various processors, e.g. Pentium Pro, Dual Pentium II, Single Pentium II, MMX or Celeron (CEL) processors.

The power control modules for the Density Series Systems are a management safety feature that turns the group power on and off, and limits current to the group by setting maximum current blocks or trip points, much like a circuit breaker automatically stops the flow of current in an overloaded circuit. Some of the power control modules are interchangeable, but it is important to note that some are not. There are various versions of the power control module, and the power control module should not be changed from system to system, or mixed between individual groups without first contracting Cubix Customer Service Technicians. The group that is to have the power control module added or removed should always be powered down. Access to the CPU Bay of the Density System should be restricted to trained personnel only.

Following are the current trip points as set by the Density Control Modules.

Group current trip points are set on the MIB by the power control module. The trip points detect if the current rating is exceeded by the group. If the current rating is exceeded, the trip points cause the slot group to shut down. The following tables display the trip points for the group configurations.

*1.5A to each PCI slot

The +5V current plus the +3.3V current cannot exceed the maximum +5Vcurrent.

There are several ways to identify the MIBs installed in the Density Series System. The first way would be to check the front console controls for group information. If your console panel has VKM and CD LEDs for 8 groups, the MIB will be the 400-A06220. If your console has VKM and CD LEDs for 6 groups, the MIB will be 400-A06230. If your console has VKM and CD LEDs for 4 groups, the MIB will be either the 400-A06200 MIB or the 400-A0685 MIB. To determine which MIB would be installed on the 4x Density System, it would require one of the following methods of operation.

The cover can also be removed from the top of the Density System and, depending upon the types of processors installed in the Density CPU bay, the Cubix Corporation logo may be able to be viewed. The MIB P/N number can be found below the Cubix Corporation logo. However, it should noted that access to the CPU bay is restricted to service personnel only.

To allow adequate air flow for proper cooling, 2 RETMA Units (2U) or 3 ½ inches, should be left open above each Density chassis. In many configurations, the Density drawer will function properly with only 1U spacing (1.75 inches). However, proper cooling is vital to sustain the reliability of components within the Density System. It is required that the temperature of the inlet air at the fans be equal to or less than 40 degrees Celsius. Exhaust can exceed the 40 degrees Celsius, but the fan inlet temperature should not exceed 40 degrees Celsius.

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