Compaq VAX 7000 Guía de instalación descargar pdf (Pagina 14)

The cabinet space ﬁlled by a PIU is known as a quadrant (’cos 4 can ﬁt in the bottom of a

cabinet). However, XMI, VAXBI and battery PIUs take up 2 quadrants (1 front and 1 rear)

each. This means that only 2 of these PIUs can be ﬁtted in a cabinet. The Futurebus+ and

Storage PIUs only take up 1 quadrant and thus 4 can be ﬁtted in the system cabinet and 6

in the expander.

Each PIU is brieﬂy described below. Most conﬁguration rules are mentioned here, but for

the full story see the Platform Service Manual.

Figure 4: Generic PIU Layout

_____

Reg B A 2 x Disk 3 x

12v_____

_____

Batts

PSU PSU

I/O type PIU SCSI DSSI PIU

2 x Disk

Battery PIUPIU

2 x Disk

3.3.1 XMI PIU

The XMI PIU houses an XMI card cage and regulators. It requires 2 (lower) PIU quadrants

to allow cable access to the rear of the XMI backplane. A maximum of 2 per cabinet and 4

per system is allowed.

The XMI backplane has 14 slots. Slots 7 and 8 contain the CLOCK and LAMB modules,

leaving 12 slots available for I/O. There is no restriction regarding I/O slots, as in the 6000

XMI, since the arbitration logic has been removed from the backplane and placed on the

clock module. The ﬁrst option must go in slot 1 or 14 to terminate the bus.

See Section 4, XMI Supported Options for details on currently supported options.

3.3.2 VAXBI PIU

Only supported on VAX7000/10000 systems.

The VAXBI PIU houses 1 or 2 VAXBI card cages and regulators. It requires 2 (lower) PIU

quadrants to allow cable access to the rear of the VAXBI backplanes. A Maximum of 1 per

cabinet and 3 per system is allowed. It must be in same cabinet as XMI PIU, XMI on LHS,

VAXBI on RHS (from front).

The VAXBI backplanes have 6 slots each. Slot 6 contains the XBIB module, leaving 5 slots

for I/O (10 slots total if both cardcages ﬁtted). Note: XBIA+ module must reside in slot 1 of

XMI.

See Section 4.2, BI Supported Options for details on currently supported options.

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Compaq VAX 7000 Guía de instalación Pagina 14