AAL
ATM Adaptation Layer
ABR
Available Bit Rate
ADSL
Asymmetric Digital Subscriber Line
AIS
Alarm Indication Signal
APS
Automatic Protection Switching (SDH)
ARIC
ATM Radio Interface Cards
ATM
Asynchronous Transfer Mode
ATU-R
ADSL Termination Unit – Remote
Bandwidth
A measure of communications capacity of data-transmission rate of a circuit. Bandwidth is the amount of data that can be carried, in bits per second (bps), by a channel.
BER
Bit Error Rate
BPS
Bits per second
BRI
Basic Rate ISDN Interface
Broadband
A high-capacity communications circuit or path.
Broadband Network
A network capable of transporting voice, data services, and interactive full-motion video.
BTS
Base Transceiver Station
CA
Coverage Area, the area that a BTS can support service to customers
CAC
Connection Admission Control
CAN
Customer Access Network
CBR
Constant Bit Rate
CDV
Cell Delay Variation
CDVT
Cell Delay Variation Tolerance
CE
Circuit Emulation
CLEC
Competitive Local Exchange Carrier
CPE
Customer Premises Equipment
CPSS
Control Packet Switching System – Newbridge’s proprietary packet-switched network management protocol based on X.25 Fast Select protocol.
CTD
Cell Transfer Delay
CTS
Customer Transceiver Station includes antenna, RF transceiver and NIU
CWDM
Coarse Wave Division Multiplexing
CWO
Cable & Wireless Optus
Dark Fibre
A glass fibre optic thread with nothing attached to it.
DBR
Deterministic Bit Rate
DF
Distribution Frame
DLC
Digital Loop Carrier
Downstream
Transmission of data towards the end user eg ISP to PC
DS3
Digital Signal Level 3. North American Hierarchy, (44,736 Mbps)
DSL
Digital Subscriber Line
DSLAM
Digital Subscriber Line Access Multiplexer
DSP
Digital Signal Processing
DWDM
Dense wavelength division multiplexing is a technology that puts data from different sources together on a an optical fibre, with each signal carried on its own separate light wavelength.
E1
Digital Signal Level 1. European Hierarchy (2.048Mbps)
E3
Digital Signal Level 3. European Hierarchy (34.368 Mbps)
Ethernet
A LAN that connects computers and peripherals and operates over twisted-pair or coaxial cable at speeds up to 10Mbps.
FEC
Forward Error Correction
Frame Relay
A Telecommunication service designed for cost-efficient data transmission for intermittent traffic between local area networks and between end-points in a wide area network.
G.703/G.704
ITU-T recommendation G.703, “Physical/Electrical Characteristics of Hierarchical Digital Interface”
HDSL
High-Speed Digital Subscriber Line
HDSL-2
High-Speed Digital Subscriber Line – Version 2, 1.5 Mbps working over 1 copper pair
HFC
Hybrid Fibre Coaxial - a telecommunication technology in which optial fibre cable and coaxial cable are used in different portions of a network to carry broadband content.
IAD
Integrated Access Device
IDSL
ISDN like DSL
IDU
Indoor Unit
ISDN
Integrated Services Digital Network
ISDN BRI
Integrated Services Digital Network – Basic Rate Interface
IP
Internet Protocol - is a standard that describes how packets of data are transported across the Internet and how these packets are recongnised as an incoming message.
IPX
Internet Package Exchange
ISP
Internet Service Provider
ITU
International Telecommunications Union
ITU G.991.1
ITU Standard for 2 pair HDSL (2Mbps), Line code 2B1Q
ITU G.991.2
ITU Standard for 1 pair SHDSL (2Mbps)
ITU G.992.1, G.dmt
ITU Standard for Full Rate ADSL. Also known as ADSL heavy.
ITU G.992.2. G.lite
ITU Standard for Lite Rate ADSL (Max. downstream speed up to 1.5Mbps). Also known as ADSL Lite.
KBPS
Kilobits per second
LAN
Local Area Network
LED
Light Emitting Diode
LGX
Lightwave Guide Cross connect
LMDS
Local Multi-point Distribution System
LNP
Local Number Portability
LOF
Loss of Frame
LOS
Loss of Signal
MAC
Medium Access Control
MAU
Media Attachment Unit
MBPS
Megabits per second
MBS
Maximum Burst Size
MDF
Main Distribution of Frame
MDU
Multi Dwelling Unit
MPEG-2
Moving Pictures Experts Group-2 – One of the standards for coding audio-visual information in a digital compressed format, for DVD quality video.
MSP
Multiplexer Section Protection Switching (SDH)
NIU
Network Interface Unit
NMS
Network Management System
NNI
Network-to-Network Interface
NNP
Network-to-Network Point
NTP
Network Terminating Point
NTU
Network Terminating Units
OC3
Optical Carrier 3 is ITU–T specified physical interface for transmission over optical fibre at 155.52 Mbps.
O&S
Operations and Support
ODU
Outdoor Unit
ORU
Outdoor Receiver Unit
OTU
Outdoor Transmitter Unit
PCR
Peak Cell Rate
PIR
Peak Information Rate
POI
Point of Interconnect
POTS
Plain Old Telephone Service
PPPoA
Point-to-Point over ATM
PPPoE
Point-to-Point over Ethernet
PRI
Primary Rate ISDN Interface
PSAX
Part of DSLAM equipment
PSTN
Public Switched Telephone Network. It’s also referred to as the Plain Old Telephone Service (POTS).
PVC
Permanent Virtual Circuit
QoS
Quality of Service
QPSK
Quadrature Phase Shift Keying
RC
Retail Carrier
RFC 1483 B/R
Describes encapsulation for carrying network interconnect traffic over ATM AAL5.
RFC 2364 (PPPoA)
Transports PPP over ATM
RFC 2516 (PPPoE)
Transports PPP over Ethernet
RIM
Remote Integrated Multiplexer
RS
Reed Solomon error correction
RTU
Remote Test Unit
SAP
ULL Service Access Points
SBR
Statistical Bit Rate
SCR
Sustainable Cell Rate
SDH
Synchronous Digital Hierarchy
SDSL
Symmetric Digital Subscriber Line
SHDSL
Symmetric Single Line Digital Subscriber Line
SIR
Sustained Information Rate
SLA
Service Level Agreement
SME
Small to Medium Enterprise
SQ
Service Qualification
Std Body ITU-T
International Telecommunications Union - Telecommunications
Std Body: ETSI
European Telecommunications Standard Institute
STM-1
Synchronous Transport Module-1. An ITU-T defined SDH physical interface for digital transmission in ATM at the rate of 155.52 Mbps.
TDM
Time Division Multiplexing
TDMA
Time Division Multiple Access
UBR
Unspecified Bit Rate
UBR+
Unspecified Bit Rate
ULL
Unbundled Local Loop
ULLS
Unconditioned Local Loop Service
UNI
User-to-Network Interface
UPC
Usage Parameter Control
UPS
Uninterruptable Power Supply
Upstream
Transmission of data from the end user to service provider (eg. PC to ISP) .
V5.2
Class 5 Switch signalling
VBRnrt
Variable Bit Rate, non real time
VBRrt
Variable Bit Rate, real time
VC
Virtual Circuit
VCI
Virtual Circuit Identifier
VDSL
Very High-Speed Digital Subscriber Line
VoDSL
Voice over Digital Subscriber Line
VP
Virtual Path
VPI
Virtual Path Identifier
WAN
Wide Area Network. A generic term for any network that covers a larage geographic area and includes packet-switching, public data, and value-added networks.
xDSL
Collective term given to address many types of DSL technologies