NonStop S-Series Hardware Installation and FastPath Guide (G06.26+)

Glossary
HP NonStop S-Series Hardware Installation and FastPath Guide—529876-001
Glossary-95
SEM
4, and this area can be dynamically switched among several selectable segments by
calls to the Guardian SEGMENT_USE_ procedure. The effect is similar to a rapid
overlaying of one large data area. See also logical segment and flat segment.
SEM. See ServerNet extender module (SEM).
semaphore. A mechanism used to provide multiple processes with access to a shared data
object.
semi-globalized. An import control characteristic of a loadfile that allows the loadfile first to
obtain symbols from its own definitions and then to obtain others as for a globalized
loadfile. See also searchList.
sensitive command. A Subsystem Control Facility (SCF) command that can be issued only
by a user with super-group access, by the owner of the subsystem, or by a member of
the group of the owner of the subsystem. The owner of a subsystem is the user who
started that subsystem (or any user whose application ID is the same as the server
ID—the result of a PROGID option that requires super-group access). Contrast with
nonsensitive command.
SEP table. See system entry-point (SEP) table.
separately derived power source. A facility wiring system where power is derived from a
generator, transformer, or converter windings and there is no direct electrical
connection, including a solidly connected grounded circuit conductor (neutral), to
supply conductors originating in other facility wiring systems. Types of separately
derived power sources include standby power generator, uninterruptible power supply
(UPS), isolation transformer, and computer-room power center (CRPC).
serial communications controller (SCC). A type of communications controller. Each
quad-integrated communications controller (QUICC) has four SCCs to handle the two
Ethernet ports and the two wide area network (WAN) ports.
serial copper. A standard for physical connectivity in ServerNet I and ServerNet II networks
that is available both in HP NonStop™ S-series servers and in Windows NT clusters.
Serial copper uses serial encoding and supports 50 and 125 megabyte/second (MB/s)
speeds. The maximum link distance at 125 MB/s is 25 meters.
serial copper PIC. See serial copper plug-in card (PIC).
serial copper plug-in card (PIC). A plug-in card (PIC) for the modular ServerNet expansion
board (MSEB) and I/O multifunction (IOMF) 2 customer-replaceable unit (CRU) that
supports the serial copper interface. See also serial copper and plug-in card (PIC).
serial maintenance bus (SMB). A bus that connects service processors (SPs) within an
enclosure to each other and to the customer-replaceable units (CRUs) in the group.