6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-28
environmental parameters
the adapters connected to the two disk drives of the mirrored volume can be in
separate enclosures.
environmental parameters. Subsystem Control Facility (SCF) session parameters set by
default or by using various SCF commands. The values associated with the
environmental parameters can be examined using the ENV command.
environment strings. For an Open System Services (OSS) process, a vector of strings of
the form
name = value that contains information about the environment that the
process runs in. Environment strings are accessible to the process and are inherited
by its child processes.
EPO. See emergency power off (EPO).
Epoch. The period beginning January 1, 1970, at 0 hours, 0 minutes, and 0 seconds
Coordinated Universal Time (UTC)
.
EPO connector. See emergency power-off (EPO) connector.
equipment grounding conductor. The conductor used to connect the non-current-carrying
metal parts of equipment, raceways, and other enclosures to the grounding electrode
conductor at the facility’s main service entrance or at the source of a separately
derived power source.
errno. An external variable that contains the most recent error condition set by a C function.
error number. For the Subsystem Programmatic Interface (SPI), a value that can be
assigned to a return token, or to the last field of an error token, to identify an error that
occurred. SPI defines a small set of error numbers, but most error numbers are defined
by subsystems.
ESD kit. See electrostatic discharge (ESD) protection kit.
ESP. See expansion service processor (ESP).
essential firmware. Code in memory that is necessary for power-up initialization and
communication with a host or device. Contrast with nonessential firmware
.
Ethernet. A local area network (LAN) that uses the carrier sense multiple access with
collision detection (CSMA/CD) access method on a bus topology and is the basis for
the IEEE 802.3 standard.
Ethernet 4 ServerNet adapter (E4SA). A ServerNet adapter for Ethernet local area
networks (LANs) that contains four Ethernet ports.
Ethernet hub. A multiport repeater typically supporting 10Base-T cabling. Most hubs are
connectors for 8 or 12 cables. Also referred to as a concentrator.