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ERS/FT II Backplanes

The ERS/FT II System supports ISA, EISA, PCI and combination backplane configurations.

PCI Backplanes

Cubix supplies three separate backplanes to satisfy the various PCI bus configuration requirements. The three PCI backplanes available in the ERS/FT II System are listed below.

2x5 PCI + 2x2 ISA 4x3 PCI 7x2 PCI

ISA Configurations

Two ISA backplanes are manufactured: one consists of eight groups of two slots each; the other consists of one group of fourteen slots and one group of two slots. Various configurations are available by inserting shunt boards into these backplanes.

8x2 ISA 1x14 + 1x2 ISA

 

EISA and EISA/ISA Configurations

Backplanes that contain EISA slots are available only for the ERS/FT II subsystem. EISA slots cannot be configured using the shunt technology described for ISA backplanes. Therefore, Cubix manufactures several EISA backplanes to satisfy the various requirements for backplane group configurations. On the backplanes that include both EISA and ISA slots, the ISA slots may be joined using the shunt technology, but the EISA slots cannot. Therefore, no shunt slots are provided between the EISA groups.

The EISA and EISA/ISA backplanes, including the various shunting configurations, are listed in Table 2. 

Table 2
EISA and EISA/ISA Backplane Confiaurations

# of Groups

Group

1

Group

2

Group

3

Group

4

Group

5

Group

6

Group

7

Group

8

1

8 EISA
8 ISA

-

-

-

-

-

-

-

2

8 EISA

8 EISA*

-

-

-

-

-

-

2

8 EISA

8 ISA

-

-

-

-

-

-

2

8 EISA
4 ISA

4 ISA

-

-

-

-

-

-

2

8 EISA
6 ISA

2 ISA

-

-

-

-

-

-

3

8 EISA
4 ISA

2 ISA

2 ISA

-

-

-

-

-

3

8 EISA

6 ISA

2 ISA

-

-

-

-

-

3

8 EISA

4 ISA

4 ISA

-

-

-

-

-

3

4 EISA

4 EISA

8 ISA

-

-

-

-

-

4

4 EISA

4 EISA

4 EISA

4 EISA*

-

-

-

-

4

8 EISA

4 ISA

2 ISA

2 ISA

-

-

-

-

4

8 EISA
2 ISA

2 ISA

2 ISA

2 ISA

-

-

-

-

4

4 EISA

4 EISA

6 ISA

2 ISA

-

-

-

-

4

4 EISA

4 EISA

4 ISA

4 ISA

-

-

-

-

5

8 EISA

2 ISA

2 ISA

2 ISA

2 ISA

-

-

-

5

4 EISA

4 EISA

4 ISA

2 ISA

2 ISA

-

-

-

6

4 EISA

4 EISA

2 ISA

2 ISA

2 ISA

2 ISA

-

-

8

2 EISA*

2 EISA*

2 EISA*

2 EISA*

2 EISA*

2 EISA*

2 EISA*

2 EISA*
* Indicates an EISA group that will accommodate either an EISA or ISA BC processor.

Each slot on the backplane of the ERS/FT II System is equipped with a +5vdc eight amp fuse. These fuses are constantly monitored by the IES. If the IES detects that a fuse has lost power, an alarm is generated to the BC Supervisor and annunciated on the console.

Since groups may be turned off independently of one another, an alarm will be generated only if a slot loses power while power to its group is turned on.

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