Sun Microsystems SPARCserver 1000 System Installation Manual page 58

Card Cage
Card Slot
CC (Cache Controller)
Clock Generation
Control Board
Disk card
Filler panel
ID
IOC (I/O Cache)
J-number
Jumper
Glossary-4
By convention, boards are installed in a card cage (not a board cage). The
SPARCserver 1000 system card cage is accessed from the rear of the enclosure
that contains up to four system or other boards. The card cage provides card
guides to guide the board into the backplane.
Each system board has three card slots for SBus interface cards.
See MXCC.
System clocks are generated on the control board and are distributed to system
boards by way of the card cage backplane.
The control board is part of the XDBus arbitration system. A central arbiter
ASIC (CARB) on the control board works in cooperation with board arbiter
ASICS (BARBs) on system boards to determine which processor controls the
bus structure at any instant. The control board mounts on top of the SCSI tray.
An optional SCSI-2 disk expansion board featuring four 3 1/2-inch disk drives.
The card cage can accommodate up to three, residing in slots 1-3.
See Air Restrictor Board.
Identity code, number, or address. ID is required for each SCSI-2 device
installed in the SCSI tray.
The IOC controls movement of data to and from the SBus card slots.
A J-number is the location on a schematic drawing or printed circuit board of a
device socket. In this manual a J-number corresponds to a U-number, which is
the SIMM or integrated circuit that occupies the device socket.
A jumper is a small metal sleeve that slides over two adjacent pins in a 2- or
3-pin header jumper receptacle to provide an electrical connection.
SPARCserver 1000 System Installation Manual—June 1996