D
ELTA
T
AU
P
OWER
PMAC
R
EFERENCE
JUNE-2018
P
OWER
PMAC
UMAC
ARM
CPU
B
OARD
H
ARDWARE
R
EFERENCE
11
Connectors and Switches and Indicators
Board Front/Back Side
Backplane (UBUS) Connection
To connect the Power PMAC UMAC ARM CPU board to the UBUS backplane, simply slide the
board into any slot of a UMAC that has a bus connection socket of a UBUS backplane board. It
does not matter which socket on the backplane board is used, although customarily the CPU
board is installed in the leftmost slot.
Getting the P1 backplane connector on the CPU board to mate firmly with the socket on the
backplane requires some force, but can easily be done by hand. In a standard UMAC rack, getting
the front plate flush with the front of the rack and turning the front screws firmly will ensure a
good connection with the backplane.
The Power PMAC UMAC ARM CPU board gets its electrical power through the UBUS
backplane board, whether the power comes from a Delta Tau power supply or an external user-
provided supply.
Ethernet Connections
The Power PMAC UMAC ARM CPU board is provided with two Ethernet TCP/IP
communication ports on the front panel: ETH 0 and ETH 1. ETH 1 may be used for the field bus
option EtherCAT provided the option has been purchased. All ports can accept standard CAT-5
