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Backplane Configuration


Backplanes (MIBS)

The key to flexibility in Cubix Systems is the backplane. It is installed in the bottom of the system, and determines how many CP, DP or SP Series plug-in computers can be installed.


MIBs and Possible Configurations

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.

MIB P/N

Description

Notes

Group Configurations

400-A06220

8x2 Backplane

w/MMX or CEL

8 Groups

Group 1 through Group 8

MMX or CEL + 1 Shared ISA/PCI Slot

400-A06230

4x2 + 2x3

Backplane

W/MMX, CEL or

DP*

6 Groups

Group 1 through Group 4

MMX or CEL + 1 shared ISA/PCI Slot

Group 5 and Group 6

DP* + 1 shared ISA/PCI Slot

400-A06200

4x3 Backplane

w/DP*

4 Groups

Group 1 through Group 4

DP* + 1 shared ISA/PCI Slot

400-A06530

1x1 MMX or CEL

+ 3x3 Pentium II

4 Groups

Group 1

MMX or CEL only

Group 2 through Group 4

Pentium II with 2 PCI Slots

Table 1 – Density MIB Configurations

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


Density Power Control Modules

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.


Maximum Current Overload Trip Points - MIBs

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.


MIB 400-A06220 (8x2 MMX/CEL) - GROUPS: G1-G8

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

11.5A

1.5A*

4.0A

1.0A

0.1A

 

MIB 400-A06230 (4x2 MMX + 2x3 DP) - GROUPS: G1-G4

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

11.5A

1.5A*

4.0A

1.0A

0.1A

 

GROUPS: G5-G6

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

19.5A

1.5*

6.8A

1.7A

0.1A

 

MIB 400-A06200 (4X3 DP) GROUPS: G1-G4

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

19.5A

1.5*A

6.8A

1.7A

0.1A

 

MIB 400-A06530 (1X1 CEL +3X3 PII) - GROUPS: G1

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

11.5A

0A

4.0A

1.0A

0A

 

GROUPS: G2-G4

GROUP VOLTAGE

+5V

+3.3V

+12V

-12V

-5V

MAX GROUP CURRENT

19.5A

3.0A*

6.8A

1.7A

0.1A

 

*1.5A to each PCI slot

The +3.3V is generated from +5v.

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


How to Identify MIBs

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.

On the back of the Density Series System, the I/O slots are numbered. If there are 16 numbered slots, the MIB will be 400-A06220. If there are 14 numbered slots, the MIB will be 400-A06230. If there are a total of 11 slots, the MIB will be 400-A06530. And, if there is a total of 12 slots, the MIB will be 400-A06200.

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.


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