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Glossary

Short reference list often used terms in our business.
A
Ampere

“A” alarm contacts
Potential free contacts

AC
Alternating Current

Ah
Ampere- hours

Arms
Ampere root mean square

CAN-bus
Controller Area Network, a multicast shared serial bus standard

CE
European mark of conformity

CO
Central Office

DC
Direct Current

DCD
DC Distribution

DSL
Digital Subscriber Line

DSLAM
Digital Subscriber Line Access Multiplexer

EMC
Electromagnetic Compatibility

EN
European Norm

ETSI

European Telecommunications Standards Institute

HTML
Hyper-Text Markup Language

IEC
International Electrotechnical Commission

IP
Internet Protocol

LCD
Liquid Crystal Display

LED
Light Emission Diode

L&N
Line and Neutral

LVBD
Low Voltage Battery Disconnect

LVD
Low Voltage Disconnect

LVLD
Low Voltage Load Disconnect

MCB
Miniature Circuit Breaker

MCU
Monitoring and Control Unit

MPSU
Modular Power Supply Unit

ms
Millisecond

NEBS
Network Equipment-Building Systems

NMS
Network Management System

PC
Personal Computer

POP
Point-of-presence

PR
Power Rack

PRS
Power Rack System

PRSB
Power Rack System with Battery

RBS
Radio Base Station

R&D
Research and Development

RFT
Remote Feeding Telecommunication

RJ45
Connection format standard

RNC
Radio Network Controller

RPS
Remote Power System

RS-232
Serial communication bus

RS-485
Serial communication bus

SMPS
Switch Mode Power Supply
An electronic power supply unit (PSU) that incorporates a switching regulator. An internal control circuit that switches the load current rapidly on and off in order to stabilise the output voltage.

SMS
Short Message Service

SNMP
Simple Network Management Protocol

TCO
Total Cost of Ownership

TCP/IP
Transmission Control Protocol/ Internet Protocol

U
Height unit (44.45mm (1.75"))

UL
Underwriters Laboratories Incorporated

USB
Universal Serial Bus

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