NonStop System Glossary

FCSA

See Fibre Channel ServerNet adapter (FCSA).

FDC

See flexible disk configuration (FDC).

feature-test macro

In C and C++ programs, a symbol that, if defined in a program’s source code, includes specific

other symbols from a header within that program’s source code and makes those symbols visible.

feeder circuit

The circuit conductors installed between the facility’s main service entrance and the power

distribution panels (PDPs) that supply the branch circuits.

ferrule

A cylindrical end terminal sometimes used on resistors, cartridge fuses, and other parts to permit

quick insertion and removal from holders that have corresponding spring contacts.

FESA

See Fast Ethernet ServerNet adapter (FESA).

Fiber Optic Extension (FOX)

Refers to two products, FOX II and ServerNet/FX, which allow you to create high-speed (up to 4

megabytes/second) networks of as many as 14 systems connected by dual fiber-optic cables.

fiber-optic plug-in card (F-PIC)

A plug-in card (PIC) for the 6760 ServerNet device adapter (ServerNet/DA) that uses a fiber-optic

interface to connect the adapter to external disk drives and to some tape drives that contain a

back-end board (BEB) that translates fiber-optic signals from the F-PIC into SCSI commands and

information for the tape drive. See also plug-in card (PIC) and SCSI plug-in card (S-PIC).

fiber optics

A medium for data transmission that conveys light or images through very fine, flexible, glass or

plastic fibers. Fiber-optic cables (light guides) are a direct replacement for conventional coaxial

and wire pairs.

fiber-optic ServerNet addressable controller (F-SAC)

A ServerNet addressable controller (SAC) that is contained within a fiber-optic plug-in card (F-PIC).

fiber-optic ServerNet cable

A ServerNet cable that uses fiber optics to transmit data. NonStop servers support two types of

fiber-optic ServerNet cables: multimode fiber-optic (MMF) ServerNet cable and single-mode

fiber-optic (SMF) ServerNet cable.

Fibre Channel ServerNet adapter (FCSA)

A ServerNet adapter that transmits data between a NonStop server and Fibre Channel storage

devices. This ServerNet adapter is installed in an I/O adapter module (IOAM) enclosure.