Sun Microsystems 6.0005E+11 - Manual (Page 234)

B-10 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
B
B.6 I/O Boards
There are several types of I/O boards.
The SBus I/O board includes two ASICs. Each ASIC provides two SBuses.
Three SBus slots are available on this board for plug-in boards. The remaining
SBus slots are used for onboard devices such as 10/100 Mbit/second twisted-
pair Ethernet, Fast/Wide SCSI, and Fiber Channel interfaces. See Figure B-7.
Figure B-7 SBus I/O Board
The Graphics I/O board includes one UPA-64 Slave Frame Buffer and one
SYSIO ASIC that provides one SBus for two SBus slots for two plug-in cards.
The remaining SBus slots are used for onboard devices such as 10/100
Mbyte/second twisted-pair Ethernet, Fast/Wide SCSI, and Fibre Channel
interfaces. See Figure B-8.
SBus slot 0
SBus slot 1
SBus slot 2
Fiber interface 1
Fiber interface 0
Twisted-pair Ethernet
Fast wide SCSI
MII external transceiver