NonStop S-Series Server Description Manual (G06.24+)

Glossary
HP NonStop S-Series Server Description Manual—520331-003
Glossary-29
emitter-coupled logic (ECL) ServerNet cable
replaceable unit (CRU) that supports the emitter-coupled logic (ECL) interface. See
also emitter-coupled logic (ECL) and plug-in card (PIC).
emitter-coupled logic (ECL) ServerNet cable. A ServerNet cable that uses emitter-
coupled logic (ECL). Before the modular ServerNet expansion board (MSEB) was
introduced, ECL was the only ServerNet cable technology used by HP NonStop™
S-series servers. You can connect an ECL ServerNet cable directly to a ServerNet
expansion board (SEB) or to an MSEB using an ECL plug-in card (PIC).
empty directory. In the Open System Services (OSS) file system, a directory that contains
only an entry for itself and an entry for its parent directory.
empty string. In C and C++ programs, a character string that begins with a null character.
This term is synonymous with “null string.”
EMS. See Event Management Service (EMS).
EMS collector. An Event Management Service (EMS) process to which subsystems report
events.
enclosure. Similar to a cabinet in HP NonStop™ K-series systems. An enclosure can
contain components of a system or a peripheral. Base enclosures are placed on the
floor and can have other enclosures stacked on top of them. Stackable enclosures can
be placed on top of other enclosures. See also system enclosure and peripheral
enclosure.
enclosure interleaving. On HP NonStop™ S-series systems, configuring a mirrored disk
volume to use two separate system enclosures. For internal disk drives, the two disk
drives of the mirrored volume can be in separate enclosures. For external disk drives,
the adapters connected to the two disk drives of the mirrored volume can be in
separate enclosures.
endian. Denotes the significance of byte 0 in a multibyte structure such as a word. NonStop
servers are big-endian, where the most significant bit is contained in byte 0; Intel
systems and HP AlphaServer OpenVMS and HP AlphaServer Tru64 UNIX systems
are little-endian, where the least significant bit is contained in byte 0.
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).