Ethernet interface and the media access unit. Automatic Lockage Lockage of a vessel without operator intervention. The PLC system has devices to sense movement of the vessel and moves the lock machinery accordingly. BNC Bayonet-Neill-Concelman. A common connector for coaxial cable. CCD Charge-Coupled Device. A semiconductor technology used to build light-sensitive electronic devices such as cameras and image scanners. CCTV Closed Circuit Television. CPU Central Processing Unit. The main processor in a PC or PLC processor card. CRT Cathode Ray Tube. DAT Digital Audio Tape. A format for storing information on magnetic tape, developed in the mid-1980s by Sony and Philips. DMA Direct Memory Access. A facility of some architectures which allows a peripheral to read and write memory without intervention by the CPU. DPI Dots Per Inch. Refers to print density. EIA Electronic Industries Association. EIDE Extended Integrated Drive Electronics. An improved version of AT Attachment, with faster data rates, 32 bit transactions, and (in some drives) DMA. Emergency Hardwired Pushbuttons, selector switches, and pilot lights that are directly wired to motor starters, solenoids, drives, etc. without any connection to the PLC system. Emergency Lockage Lockage of a vessel using the emergency hardwired system. Movement EM 1110-2-2610
12 Dec 03
GLOSSARY
Terms and Abbreviations


AFD Adjustable Frequency (speed) Drive. See also VFD.

AIC Amperes Interrupting Rating. Short circuit rating of electrical equipment.

ATA Advanced Technology Attachment. The official name for the disk drive interface
standard commonly known as Integrated Drive Electronics (IDE).

AUI Attachment Unit Interface. A transceiver cable that provides a path between a nodes
Ethernet interface and the media access unit.

Automatic Lockage Lockage of a vessel without operator intervention. The PLC system has
devices to sense movement of the vessel and moves the lock machinery accordingly.
BNC Bayonet-Neill-Concelman. A common connector for coaxial cable.

CCD Charge-Coupled Device. A semiconductor technology used to build light-sensitive
electronic devices such as cameras and image scanners.

CCTV Closed Circuit Television.

CPU Central Processing Unit. The main processor in a PC or PLC processor card.

CRT Cathode Ray Tube.

DAT Digital Audio Tape. A format for storing information on magnetic tape, developed in the
mid-1980s by Sony and Philips.

DMA Direct Memory Access. A facility of some architectures which allows a peripheral to
read and write memory without intervention by the CPU.

DPI Dots Per Inch. Refers to print density.

EIA Electronic Industries Association.

EIDE Extended Integrated Drive Electronics. An improved version of AT Attachment, with
faster

data rates, 32 bit transactions, and (in some drives) DMA.

Emergency Hardwired Pushbuttons, selector switches, and pilot lights that are directly wired to
motor starters, solenoids, drives, etc. without any connection to the PLC system.

Emergency Lockage Lockage of a vessel using the emergency hardwired system. Movement

1 EM 1110-2-2610
12 Dec 03

of individual lock gates and valves without use of the PLC system.

EOT LS End of Travel Limit Switch.

Gbps Gigabits per Second. Billions of bits per second. A unit of information transfer rate.

GFE Government Furnished Equipment.

GUI Graphical User Interface. Also referred to as man-machine interface (MMI). The
operating interface used to control a lock and dam.

I/O Input/Output.

IDE A disk interface standard based on the IBM PC ISA 16 bit bus but also used on other
personal computers.

IEEE Institute of Electrical and Electronic Engineers.

Internet A three level hierarchy composed of backbone networks, mid-level networks, and stub
networks interconnected with routers.

Intranet Any network that provides similar services within an organization to those provided by
the Internet outside it but which is not necessarily connected to the Internet.

IPC Industrial Personnel Computer. Industrial hardened PC for use in harsh environments or
process-critical applications. Uses passive backplane CPU mounting, extra fans with filters for
additional cooling capacity, larger power supply, etc.

IPX Internetwork Packet eXchange. Novells protocol used by Novell Netware. A router with

IPX routing can interconnect Local Area Networks so that Novell Netware clients and servers
can communicate.

ISA Industry Standard Architecture. A bus standard for IBM-compatibles that extends the XT
bus architecture to 16 bits.

ISDN Integrated Services Digital Network. A set of communications standards allowing a
single wire or optical fiber to carry voice, digital network services and video.

Keypad Controller This device controls and programs the matrix switcher in the CCTV system.
The device is used to switch the cameras between the monitors in the system. The device is
equipped with a joystick to pan and tilt the moveable cameras and a pushbutton or lever to
control the camera zoom.


2 EM 1110-2-2610
12 Dec 03

LAN Local Area Network. A data communications network which is geographically limited
(typically to a 1 km radius) allowing easy interconnection of terminals, microprocessors and
computers within adjacent buildings.

LCD Liquid Crystal Display. An electro-optical device used to display digits, characters or
images, commonly used in digital watches, calculators, and portable computers.

LED Light-Emitting Diode. A type of diode that emits light when current passes through it.

Manual Lockage Lockage of a vessel, via the PLC system, moving each gate and valve
individually.

MB Megabyte. 1024 kilobytes.

Mbps Megabits per Second. Millions of bits per second. A unit of information transfer rate.

MCC Motor Control Center.

MMI Man-Machine-Interface. Also referred to as graphical user interface (GUI). The operating
interface used to control a lock and dam.

NEMA National Equipment Manufacturers Association.

Network An interconnection of computer systems, terminals, or data communications facilities.

NIC Network Interface Card. An adapter circuit board installed in a computer to provide a
physical connection to a network.
PC Personal Computer. Standard desktop model.

PLC Programmable Logic Controller. A computer-like device for controlling a system or
process.

PLC Hardwired Pushbuttons, selector switches, displays, and other operator interface devices
that are directly wired to PLC inputs.

PPM Pages per Minute.

PPP Point-to-Point Protocol, Provides the Internet standard method for transmitting IP packets
over serial point-to-point links.

PTZ Pan/Tilt/Zoom. Functions included in a CCTV system.

RHNC Relative Humidity Non-Condensing.


3 EM 1110-2-2610
12 Dec 03

4

SAW Surface Acoustical Wave. A type of touchscreen monitor.

SCSI Small Computer System Interface. A processor-independent standard for system-level
interfacing between a computer and intelligent devices including hard disks, floppy disks, CD-
ROM, printers, and scanners.

SECC Single Edge Contact Cartridge. The type of mounting configuration for Intels Pentium
II processor.

Semi-Automatic Lockage Lockage of a vessel in two steps in which the operator initiates
commands only after a vessel has moved. In general, one command prepares the downstream
end of the lock for entry or exit, and one prepares the upstream end of the lock. The rest of the
lockage equipment is moved by the PLC system.

SIMM Single In-line Memory Module. A small circuit board or substrate with RAM integrated
circuits or die on one or both sides and a single row of pins along one long edge.

SMA Sub-Miniature Assembly. A type of fiber optic cable connector.

SNMP Simple Network Management Protocol. The Internet standard protocol developed to
manage nodes on an IP network.

ST Straight Tip. A type of fiber optic cable connector.

TCP/IP Transmission Control Protocol/Internet Protocol. The most common transport layer
protocol used on Ethernet and the Internet.

µm Micrometer or micron. Unit of measure for fiber optic cable dimensions.

UPS Uninterruptible Power Supply. A (battery powered) power supply that is guaranteed to
provide working voltage to a computer regardless of interruptions in the incoming electrical
power.


VCR Video Cassette Recorder.

VFD Variable Frequency Drive. A type of motor drive that provides different speeds and
torques based on frequency.

VHS Video Home System. VCs video cassette format.

WAN Wide Area Network. A network, usually constructed with serial lines, extending over
distances greater than one kilometer.