NonStop S-Series Planning and Configuration Guide (G06.29+)

System Components
HP NonStop S-Series Planning and Configuration Guide—523303-021
4-30
Emergency Power-Off (EPO) Connector
Slots 51 and 52
Processor enclosure slot 51 is single ported to the X fabric and slot 52 to the Y fabric
on all systems using ServerNet router 1 (NonStop S7000, S7400, S70000, and
S72000 servers). Slots are dual ported to both the X and Y fabrics on all systems using
ServerNet router 2 (NonStop S7600, S7800, S7800B, S74000, S76000, and S86000
servers). In small systems that do not contain SEBs or MSEBs, ServerNet adapters
can occupy slots 51 and 52 of processor enclosures. For information about the
ServerNet routers, see Detailed Logical Diagrams on page 2-4.
Emergency Power-Off (EPO) Connector
The emergency power-off (EPO) connector is located in slot 56.
The EPO connector connects a system enclosure to the emergency power-off (EPO)
circuitry at your site. When the EPO system is activated, building AC power is removed
from the system and an EPO signal is activated, which causes the batteries to
disconnect after four minutes. The EPO system is intended only for emergency use
and should never be used as part of a normal power-off procedure because it shuts off
power to peripheral components in the computer room and does not allow for an
orderly shutdown or recovery of the system.
The EPO connector is used only when a system is installed in a computer room in the
United States or when required by local regulations. For more information about EPO
connections, see Section 12, Site Planning and Preparation.
Processor Multifunction (PMF) CRUs
PMF CRUs occupy slots 50 and 55 of processor enclosures. They:
•
Process and store instructions and data
•
Maintain ServerNet links
•
Supply power
•
Provide power-on connections
•
Provide router connections
•
Provide service processor functions
PMF CRUs come in the following models:
PMF CRU Model Associated Server (page 1 of 2)
1950 S7000
1951 S70000
1954 S72000
1960 S7400
1961 S7600*
1962 S7800*
1975 S7800B*