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Console terminal I/O and expander cabinet remote power control/status
connections are located to the right of the control panel. These three modu-
lar jacks, allow power control/status connections to the left expander cabi-
net, right expander cabinet, and I/O connections to the console terminal.
The console terminal modified modular jack is keyed so that an expander
cabinet connector cannot be plugged into its jack.
The system cabinet has four quadrants in the bottom of the cabinet. The
XMI PIU can be installed in two quadrants and the other two quadrants
are used for expansion bays. These expansion bays can contain another
XMI PIU, a SCSI PIU (for DEC 7000 systems), a DSSI PIU (for VAX 7000
systems), or a battery PIU. The number of expansion bays used by each
PIU varies depending on the type of PIU.
A PIU contains an I/O bulkhead, which houses the I/O connections for the
devices in the PIU (such as adapter modules and disk drives). These I/O
connections are located on a panel that is installed on the I/O bulkhead.
The I/O bulkhead can have single, dual, quad, and octal panels.
The XMI PIU occupies two expansion bays and is designed to accommodate
a variety of I/O connectors (depending on the adapter used). The standard
Ethernet port is a 15-pin connector that is installed in a single panel. The
connector contains a red LED that is on when 13.5 VDC power is applied
to the Ethernet transceiver.
System Components 2-11
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