Glossary of Terms
Glossary
ADSL
Asymmetric Digital Subscriber Line - the broadband technology used to deliver standard copper broadband products. It is designed to be able to run over long copper cable lengths, sacrificing speed for distance, allowing wider data coverage with fewer DSLAMs across the network.
BNS
Backhaul Network Services. Backhaul Network Services (BNS) is a solution for communications providers who want to backhaul data from a number of outlying Local Loop Unbundling (LLU) or mobile Base Station Controller sites to their own network.
CLI
Calling Line Identity (also known as Caller ID, caller identification, CID, Calling Number identification, or CNID). A telephone service that transmits a caller's number to the receiving telephone equipment during the ringing signal, or when the call is being set up, but before the call is answered.
DACS
Digital Access Carrier System (also known as 0+2 Pair gain system). Modern ISDN technology based digital systems, made up of two normal subscriber lines over one copper pair.
DASS
Digital Access Signalling System. Our original ISDN30 offering used this as a signalling standard.
DDI
Direct Dialling In. A facility that lets callers dial direct into a firm's PABX extensions as if they were normal public telephone numbers. Most of our offices have DDI facilities.
DLM
Dynamic Line Management - this is a system that monitors each line in real time based on a set of rules within a defined policy to change the parameters of the line to achieve the best balance of speed and line stability. There are currently three policies which have different rules for managing the lines, Speed, Standard and Stable.
DMSU
Digital Main Switching Unit. These are the original long-distance exchanges. They are System X switches with the capacity to handle 30,000 simultaneous calls each. Every DMSU is connected to all the other DMSUs. This involves a much smaller number of links than would be required to link together the Digital Local Exchange.
DPNSS
Digital Private Network Signalling System. A network protocol used on digital trunk lines for connecting two PABX. It supports a defined set of inter-networking facilities.
DP
Distribution Point. A point within a network where the cable or fibre terminates. This provides a point of entry for engineers to terminate or test the network. Typically these points are located on telegraph poles.
DSLAM
Digital Subscriber Line Access Multiplexer. A network device, located in the telephone exchanges of the service providers,
DTMF
Dual Tone Multi Frequency. Used for telecommunication signalling over analogue telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching centre.
ETSI
European Telecommunications Standards Institute. An independent, non-profit, standardisation organization in the telecommunications industry in Europe with worldwide projection. ETSI has been successful in standardising the Low Power Radio, Short Range Device, GSM cell phone system and the TETRA professional mobile radio system.
EAD
Ethernet Access Direct. Offers permanently connected, point-to-point high speed data circuits that provide a secure and un-contended Ethernet service for Communications Providers between flexible network and customer nodes.
EBD
Ethernet Backhaul Direct. Offers permanently connected, point-to-point high speed data circuits that provide a secure and un-contended Ethernet backhaul service for Communications Providers over a defined network infrastructure.
FTTC
Fibre to the Cabinet - the term for the supply of data services over a fibre optic cable running between the local exchange and the local street cabinet, then using existing copper cable to deliver the data to the end user’s premises. In FTTC, the device which translates the data into a signal that can be carried over copper wire, the DSLAM, sits in a local street cabinet, rather than in the local exchange.
FTTP
Fibre to the Premises - the term for the supply of data services over a fibre optic cable running between the local exchange and the end user's premises. This technology completely replaces the need for copper cabling within the Openreach network.
FTTP ABBREVIATIONS
- AN – Aggregation Node
- BFT – Blown fibre tube
- CBT - Connectorised block terminal
- CMJ – Compact multi-function joint (used as small plitter or intermediate joint)
- ELM – External locking mechanism (locking bollard)
- FDP – Fibre DP
- MMJ – Medium multi-function joint (used as medium splitter or intermediate joint)
- NJ4A – Node Joint 4A
- OTDR – Optical Time Domain Reflectometer
- PM – Pole mounted
- PMC – Pole mounted closure (interim pole mounted transition joint)
- SN – Splitter Node
- SST- Standard single tube (small profile cable)
- ULW – Ultra Lightweight (36 fibre cable)
- UN2 – Universal node 2 (used as large splitter or intermediate joint)
FTTx
Fibre to the (Cabinet - FTTC, Premises - FTTP, etc). Any broadband network architecture that uses optical fibre to replace all or part of the usual metal local loop used for last mile telecommunications.
GPON
Giggabit Passive Optical Node
HDSL
High Speed Digital Subscriber Line (also known as High-speed Digital Subscriber Loop). A copper delivered service on Copper Wideband Serving Section (CWSS). It is subject to reach limitations and is used primarily to provide 2 Mbit service to singleton sites.
ISDN
Integrated Services Digital Network. A digital network that lets a whole host of services be carried together on the same circuits. Considered an extension of the public switched telephone network, the key similarity is that it lets any two compatible pieces of connected equipment talk to each other. ISDN can carry any form of data, such as voice, video and computer files.
LAN
Local Area Network
L2C
Lead To Cash (provisioning). The lead to cash process goes from initial contact, to sale, to service delivery, to payment collection.
LLU
Local Loop Unbundling. Lets communications providers offer the full range of voice and broadband services, without having to route through our main network.
MDF
Main Distribution Frame. A point in a telephone exchange where cables from outside can be connected to the exchange equipment.
MSN
Multiple Subscriber Number. An ISDN version of Direct Dial In.
Multicast
A service within the Openreach network for distributing live television broadcasts to many users over broadband at the same time, in real time.
NGA
Next Generation Access (also known as Super Fast Fibre access). Our programme that is dedicated to shaping tomorrow's communications environment. We work with communications providers, the regulator, industry and other stakeholders to ensure that we build a clear picture of an access network that's fit for the future.
NTE5
Network Termination Equipment version 5 - also commonly known as the master socket, this is the copper termination point within the end user's premises and the place where the GEA over FTTC SSFP is installed. The master socket marks the demarcation point between the Openreach network and the end user's home network with respect to voice wiring.
NTE
Network Terminating Equipment. Equipment that is located in the home or office. Examples are set top boxes and LAN.
NTP
Network Terminating Point. The place where the network ends.
OHP
Openreach Handover Point. Mainly located in Metro Nodes, which are the breakout point for our Bulk Transport Link and Ethernet Backhaul Direct products.
ONBS
Openreach Network Backhaul Service. Offers connectivity between a communications providers' equipment (installed within Co-location, Netlocate or BT Locate at a BT MSAN Site) and their equipment (installed within Co-location, Netlocate or BT Locate at either the nearest BT MSAN Site, BT Metro Node Site or another BT MSAN Site or Metro Node Site which is within a distance of 15 radial kilometres of the first BT MSAN/Metro Site).
PBX
Private Branch Exchange. A telephone exchange that serves a particular business or office.
PCP
Primary Cross-connection Point - this is the local street cabinet in which cables extending out to local distribution points are aggregated and connected to larger copper and fibre optic cables to move the voice and data signals to and from the local exchange. The number of connections managed in a PCP depends on the number of end user premises in an area, but is usually several hundred (200-400) lines.
POTS
Plain Old Telephony Service (also known as an analogue telephone line). The basic services provided over the Public Switched Telephone Network (PSTN).
PSTN
Public Switched Telephone Network. It was originally a network of fixed-line analogue telephone systems but the switching (or telephone exchange) element of the PSTN is now digital. The mobile telephony networks are considered to be part of the PSTN.
PSU
Power Supply Unit (power supply). A power supply unit is a device that supplies electrical power to a device or group of devices.
PON
Passive Optical Node (Network)
SDSL
Symmetric Digital Subscriber Line (also known as Symmetric Digital Subscriber Loop). Uses a single wire pair to carry a few Mbit/s of data. However, unlike ADSL, upload and download speeds for the user are the same (hence symmetric versus asymmetric).
SFFA
Superfast Fibre Access - the marketing term used to describe Openreach's fibre optic access products
SNDDI
Single Number Direct Dialling In. An individual number DDI range, which means that for incoming calls the network will send, as default, 6 routing digits to the customer equipment so that calls can be directed to the correct channel.
TPON
Telephony over Passive Optical Networks. A technology that we have designed, it is made up of slim fibre optic cable instead of lots of copper wire pairs.
VDSL
Very high bit rate Digital Subscriber Line - the broadband technology used to deliver the higher speeds associated with FTTC compared to standard copper broadband products which are delivered over ADSL. VDSL is designed to work on shorter lengths of copper cable.
VIC
Virtual Interconnect Circuit. Allows for migration of interconnect routes from the DLE to the NGS.
VLAN
Virtual Local Area Network - a subdivision of the capacity within the network representing the "pipe" provided for a single end user’s data traffic through the Openreach network.
A
A/C
Aerial Cable
A&I
Accommodation and Infrastructure (planners)
ABB
Apartment Breakout Box
ABP
Address Based Premium
ACR
Access Capital Repair
ADSL
Asymmetric Digital Subscriber Line
ADSS
All-Dielectric Self-Supporting
AEC
Access Engineering Communications
AFM
Anticipated Faults Management system
AFS
Actual Faults Saved
AGC
Automatic Gain Control
Agg
Aggregation node (AKA an AN)
AICC
Assets In the Course of Construction
AIO
All In One (Cabinet)
AIRG
Accident & Incident Reporting Group
AJ
Aggregation Joint
AKA
Also Known As
ALP
Annual Learning Plan
AN
Aggregation Node. Fibre from the exchange is split and feeds Splitter nodes via mini cables. Also referred to as the Agg node
ANFP
Access Network Frequency Plan
AOC
Access Operation Centre (Bristol based Operations Control)
AOP
Annual Operating Plan
AOMP
Advanced Order Management Process
AONB
Areas of Outstanding Natural Beauty
AP
Address Point
APC
Angled Physical Contact
APT
All Ports Test
AR
Augmented Reality
ARENA
Audit Record of Engineering Network Activity
ASDH
Access Synchronous Digital Hierarchy
ASOW
As Seen On Workplace
n/a
Asset Assurance Team (now see Network Repair Team - NRT)
ASU
Advanced Service Unit
ATA
Analogue Telephony Adapter
ATE
Automatic Telephone Exchange
AVC
Aborted Visit Charges
AXE10
System Y type Exchange
ATM
Asynchronous Transfer Mode
B
BCD
Business and Corporate Delivery
B2B
Business to Business
BAU
Business As Usual
BB
Broadband
BB VAS
Broadband Value Added Services
BBU
Battery Back Up
BCD
Business & Corporate Delivery
BCMR
Business Connectivity Market Review
BCOF
Blown Cable Optical Fibre
BDF
Building Distribution Frame
BDUK
Broadband Delivery UK
BET
Broadband Enabling Technology
BFB
Blown Fibre Bundle
BFD
Blown Fibre Drop tubing
BFT
Blown Fibre Tubing
BFU
Blown Fibre Unit
BLT
Bend Limiting Tubing
BNR
Bell Not Ringing
BPON
Business Passive Optical Network
BPS
Business and Public Sector
BR
Bell Ringing (continuous)
BT
Block Terminal
BTCC
BT Compliance Committee
BTD
BT Design
BTGS
BT Global Services
BTO
BT Operate
BTTW
Build To The Wall
BTW
BT Wholesale
C
C2M
Concept to Market
CA
Customer Apparatus
Cab
Short name for cross-connection street cabinet (See PCP)
CAD
Corporate Active Directory
CAL
Cabinet Assigned Loss
CARM
Compliance And Risk Management
CAT
Connectivity Allocation Tool - NewSite related developer tool
CAT
Cable Avoidance Tool
CBO
Cable Break Out
CBT
Connectorised Block Terminal
CCD
Customer Committed Date
CCJ
Cable Chamber Joint
CCN
Cross-CoNnection
CCT
Circuit
CCTV
Closed Circuit TeleVision
CDD
Contractual Delivery Date
CDDC
Connectorised Dual Drop Cable
CDH
Cloud Data Hub
CDM
Construction Design Management
CDT
Continuous Dial Tone
CDTA
Conscious Decision to Appoint
CE
Chief Engineer
CE
Customer End
CEM
Chief Engineer Module
CEO
Chief Executive Officer
CET
Copper Enhanced Technologies
CFI
Customer Focused Investment
CFP
Community Fibre Partnership
CFU
Customer Facing Unit
CIDT
Copper Integrated Demand Test
CIO
Chief Information Officer
CJ
Cable Junction
CLI
Calling Line Identity
CLI
Customer Lead In
CMJ
Compact Multi-function Joint (Small Node)
CMN
Common
CMO
Compliance Monitoring Office
CMS CIS
Core Cable Maintenance Service. Common Infrastructure System
CMUX
Convertor MUltipleXer
CN
Civil Network (diagram)
CNF
Calling and Network Features
CNS
Customer Network Solutions
CO
Cuts Off
CO
Central Office (USA-Exchange)
COF
Cable Optical Fibre
COM
Completion
COMP
Completion
CONGO
Control Of New Greenfield Organisation
COTS
Commercial Off The Shelf
COW
Class Of Work
CoW
Clerk of Work
CP
Communications Provider
CP OCR
Communication Provider Optical Consolidation Rack
CPCA
CP controlled ATA
CPE
Customer Premises Equipment
CPE
Customer Provider Equipment
CPG
Core Planning Guide
CPI
Copper Pair Identification
CPW
CarPhone Warehouse
CR
Change Request
CRD
Customer Required By Date
Csat
Customer satisfaction
CSE
Customer Service Engineer
CSGS
Customer Service Guarantee Scheme
CSIM
Customer Service Insight Management
CSP
Customer Service Plan
CSP
Customer Splicing Point
CSP
Customer Service Point
CSPN
Connectorised SPlitter Node
CSS
Customer Service System
CST
Customer Service Team
CTD
Cumulative To Date
CTH
Central Test Head
CTIO
Chief Technology & Information Office
CuRe
Copper Rearrangement
CVF
Customer Verification Facility
CWSS
Copper Wideband Serving Section
CWWC
Confirm Working With Customer
D
D-side
Distribution side (of a Primary Cross-Connection Point - PCP)
D/W
Drop Wire
DACS
Digital Access Carrier System
Db
Decibel
DC
Data Centre
DC
Direct Currant
DCAT
(Now known as CAT) - Developers Connectivity Allocation Tool
DCN
Data Connection Network
DCR
ofcom Digital Communications Review
DCoE
Diagnostic Centre of Excellence (DCoE) teams
DCMS
Department for Culture Media & Sport
DCT
Data Centre Team
DCU
Damage Claims Unit (Now see Network Repair Team – NRT)
DEA
Digital Ethernet Access
DEL
Dedicated Exchange Line
DF
Dark Fibre
DF
Direct Fulfilment
DF1AL
Dark Fibre 1 Access Link
DF2AL
Dark Fibre 2 Access Link
DFA
Dark Fibre Access
DFE
Departure From Estimate
DFS
Dark Fibre Storage
DFS
Discrete Façade
DFW
Dual Fibre Working
DFX
Dark Fibre eXchange
DH
Data Hall
DHCP
Dynamic Host Control Protocol (part of IP suite of protocols)
DIG
Direct In Ground
DILOR
Dropwires In Line Of Route
DIS
Disconnection
DLE
Digital Local Exchange
DMC
Data Management Centre
DN
Directory Number
DNA
Dense Network Access
DNO
Distribution Network Operator
DOA
Dead On Arrival
DP
Distribution Point (Often a telegraph pole)
DPA
Duct and Pole Access
DPNSS
Digital Private Network Signalling System
DPU
Distribution Point Unit
DSI
Developer Self Install
DSL
Digital Subscriber Line
DSLAM
Digital Subscriber Line Access Multiplexer
DSN
Distribution Splitter Node
DT
Diagnostic Test
DWAL
Directly Wired Access Line
E
E-Side
Exchange Side (of a Primary Cross-Connection Point - PCP, aka M-Side, Main Side)
EAD
Ethernet Access Direct
EBLC
EmBedded Line Card
ECC
Excess Construction Charges
ECC
Electronics Communications Code
ECD
Estimated Completion Date
ECI
DSLAM and modem vendor
EDFA
Erbium Doped Fibre Amplifier
EES
Ethernet Edge Switch
EIC
Electrical Installation Certificate
EICR
Electrical Installation Condition Report
ELF
Early Life Failures
ELM
External Locking Mechanism (Locking bollard)
EM
Element Manager
EMDL
Early Market Deployment Launch
eMLC
enhanced Managed Line Characteristics
EMP
Equivalence Management Platform
EMS
Environmental Management System
ENA
Equipment Network Access
ENA
Energy Networks Association
EO, E/O
Exchange Only (cable)
EOI
Equivalence Of Input
EoSL
End of Service Life
ES
Engineering Services, CPs can purchase the ES service from us
ESRI
Environmental Science Research Institute
ESV
Ethernet Single Visit
ETSI
European Telecommunications Standards Institute
EU
End User
EU
European Union
EU
Exchange Unit
EvoTAM
Evolutionary Test Access Matrix
EX
Exchange
EXFO
a type of Remote Test Unit (a hand-held tester)
F
F
Fibre
FACT
Front Access Connector Tray
FBC
Field Based Co-ordinator
FBWP
FaceBook WorkPlace
FDP
Fibre Distribution Point. Blown fibre feeds the premises
FDP
Floor Distribution Point
FDC
Fibre Drop Cable
FEN
Field Engineering News
FFA
Future Fibre Architect
FFTC
Fibre From The Cabinet
FIRS
Fibre Integrated Reception Service
FJ
Faults man Jointer
FLL
First Line Leader
FLM
Fibre Locking Mechanism
FNC
Fiber Node Configurator
FND
Fibre and Network Delivery
FNF
Fault not Found
FNT
Faint Transmission
FOA
First Office Application
FoD
Fibre on Demand
FOD
First Occupation Date
FOD
Fibre Only Drop (Cable)
FODW
Fibre Only DropWire (aka FOD)
FPQ
Field Performance in Quality
FRAC
Fibre Repair Analysis Centre
FSD
First Service Dates
FT2
FastTest2
FTA
Freight Transport Association
FTTC
Fibre To The Cabinet
FTTD
Fibre To The Door
FTTDP
Fibre To The Distribution Point
FTTP
Fibre To The Premises
FTTx
Fibre To The cabinet or premises (generic term)
FTTRN
Fibre To The Remote Node
FU
Frames Unit
FVA
Fibre Voice Access
G
G.fast
(Also known as G.9700 and G.9701 fast access to subscriber terminals)
GDPR
General Data Protection Regulation
GEA
Generic Ethernet Access
GigE
Gigabit Ethernet
GP
Ghost Plan
GPON
Gigabit Passive Optical Network
GQTT
Group Quality Task Time
GS
Global Services
GSP
Ground Support Person
GTCJ
Generic Test Controller - Java
GTCS
Generic Test Controller - Sun
GUI
Graphical User Interface
GUNPF
BT Group UK Numbering Policy Forum
H
HAWK
Hawk type Hand Held Tester
HBF
House Builders Federation
HCR
Heavy Cable Recovery
HCSA
Hydra Cable Storage Area
HCSC
High Capacity Single Circuit tray
HCSE
High Capacity Single Element tray
HD
High Density
HDD
Horizontal Directional Drilling
HDF
Handover Distribution Frame
HDTV
High Definition Television
HE
HeadEnd
HERS
Highway Electrical Registration Scheme
HEX
Heat Exchanger
HHT
Hand Held Terminal/Tester
HLD
High Level Design
HLSD
High Level Solution Design
HND
Holistic Network Design
HOF
Handover Frame
HOP
HandOver Pack
HOTAN
Health of the Access Network
HR
High Resistance (fault in the copper access network)
HRD
High-Reflectance Demarcation
HTTP
Hyper Text Transfer Protocol
HYDRA
Fibre optic cables used in the Optical connection rack
Hz
Hertz
I
ICB
Incoming Calls Barred
ICE
Infrastructure Clearance and Extraction
ICNIRP
International Commission on Non-ionizing Radiation Protection
ID
Infrastructure Delivery
IDC
Insulation Displacement Connection
IL2S
Integrated Layer 2 Switch
ILC
In Life Capacity
IMU
Integrated Market Review (2021)
IMUX
Inverse MUltipleXer
INS
Integrated Network Systems
IPA
IsoPropol Alcohol
IP
Internet Protocol
IPTV
Internet Protocol Television
IS
Infrastructure Solutions
ISA
Information Sharing Agreements
ISDN
Integrated Service Digital Network
ISIS
Inland Services Information System
ISP
Internet Service Provider
ITT
Invitation To Tender
IVR
Interactive Voice Response
J
JB
Joint Box
JDSU
VIAVI (formally known as JDSU) – manufacturer of hand held tester
JF(x)
Joint Box Footway (size reference)
JP
Joint Post
JPPA
Job Pack Production Assistant
JRB
Joint Box Reinforced Brick - (Standard brick joint box)
JRC
Joint Box Reinforced Concrete - (Standard concrete joint box)
JUF
Joint box Unreinforced Footway
K
KBD
Knowledge Based Diagnostics
KCI
Keeping Customers Informed
KJC
Kit Joint Closure
kHz
KiloHertz
km
Kilometre
L
L2C
Lead To Cash (Income for business, previously known as Provision)
L2S
Layer 2 Switch (Ethernet switch that is the connectivity point for CPs to the NGA Network)
L2W
Licence to Work
LA
Local Access
LA
Local Authority
LAD
Local Access Dataset
LAG
Link Aggregation Group
LAN
Local Area Network
LC
Line Card (also a type of fibre connector)
LDU
Loop Diagnostic Unit
LEA
Line Extenders Audio
LES
Line Extended Signalling
LFFN
Local Full Fibre Networks
LHS
Left-Hand-Side
LiC
Line interface Card
LIJ
Left In Jumpers
LJU
Line Jack Unit
LLC
Line Loss Calculator
LLEL
Low Loss Exchange Line
LLPP
Local Line Physical Protection
LLR
Light Loss Report
LLS
Low Level Solution
LLSD
Low Level Solution Design
LLT
Light Loss Task (Testing)
LLU
Local Loop Unbundling
LLUC
Local Loop Unbundling Commingling
LLUMS
Local Loop Unbundling Management System
LMA
Loop Management Area
LMTP
Let’s Make This Personal
LN
Line Network
LOB
Line of Business
LP/APC
Lucent Connector/Angled Physical Contact
LRQA
Lloyds Register Quality Assessment
LRT
Long Reach Tails
LSBUD
Line Search Before yoU Dig
LSZH
Low Smoke Zero Halogen
LT
Line Test
LTDS
Line Test Dialogue Services
LTE
Line Terminating Equipment
LTOK
Line Test OK
LTOP
Line Test on Provision
LTOR
Line Test on Repair
LTS
Line Test System
LTU
Line Termination Unit
LV
Low Voltage
M
MBORC
Matters Beyond Our Reasonable Control
Mbps
Megabits per second
MBR
Minimum Bend Radii
MCJ
Mechanical Clip Joint
MDF
Main Distribution Frame
MDT
Manage Diagnostic Test
MDU
Multiple Dwelling Unit
MEAS
Mobile Ethernet Access Service
MET
Main Earth Terminal
MEMS
Micro-Electro-Mechanical Systems
MEWP
Mobile Elevating Work Platform
MFD
Mode Field Diameter
MFL
Main Fault Location
MFN
Multifunctional Node
M/H
Manhole
MI
Managed Install
MiMo
Multiple input Multiple output
MIS
Management Information Systems
MLC
Manage Line Characteristics
MLPA
Managed Line Plant Availability
mm
millimetre
MMJ
Medium Multi-function Joint (Medium Node)
MMPF
Multiple Metallic Path Facility
MMR
MeetMe Room (in a data centre)
MNSD
Manage Network and Service Diagnostic
MoBRA
Mounting BRAcket arm
MOU
Multiple Occupancy Unit
MPO
Multi-fibre Push On
MPA
Manage Product Availability
MPE
Multi-Purpose Enclosure (new name for UCAO)
MPF
Metallic Path Facility
MPI
Managed Physical Inventory
M-Side
Main Side (aka E-Side, Exchange Side)
MSAN
Multi-Service Access Node
MSL
Minimum Service Level
MTP
Medium Term Plan
MTTP
Mean Time To Provide
MTU
Multi-line Terminating Unit
MU/CJ
Main Underground/Cable Junction
N
NA
No Access
NA
Network Assessor
NAC
Network Analysis Centre team
NAD
Network Address Database
NAT
Node Analysis Tool
NATO
Neighbourhood Analysis Tool for Openreach
NC
Non-Compliance
NCSC
National Cyber Security Centre
NDS
Network Decision Support System
NDT
No dial tone
NED
Network Engineering Delivery
NED
Network Enhanced Device
NGA
Next Generation Access
NGN
Next Generation Network
NIMS
Network Information Management System
NIN
Northern Ireland Networks
NIT
Network Integration Test
NNI
Network Nodal Identifier
NOCR
Network Optical Consolidation Rack
NOPS
Network Operative Passport Scheme
NOT
Network Optimiser Tool (NewSites)
Not Spot
Areas of the country where there is currently no broadband coverage at all
NOU
Network Operations Unit
NR
No Reply
NRSWA
New Roads and Street Works Act
NSP
Non Served Premises
NSY
Noisy
NRT
Network Repair Team (03/06/19 now combines Asset Assurance team and Damage Claims Unit)
NT
No Tone
NTE
Network Terminating Equipment
NTP
Network Terminating Point
NTTP
Network Termination and Test Point
NTU
Network Terminating Unit
NU
Number Unobtainable
NUD
No Undue Discrimination
O
OBARCC
Openreach Board Audit, Risk and Compliance Committee
OCB
Outgoing Calls Barred
OCR
Optical Connection or Consolidation Rack
ODF
Optical Distribution Frame
ODN
Optical Distribution Network
Ofcom
Office of communications
OFF
Optical Flexibility Frame
OFN
One Fibre Network
OFNL
Open Fibre Networks Limited
OFR
Optical Flexibility Rack
O/H
Overhead
OHP
Openreach Homes Passed
OHR
Overhearing
OIB
Openreach Investment Board
OLO
Other Licensed Operators
OLT
Optical Line Termination (generally network side)
OMP
Openreach Marketable Premises
OMU
Openreach Monitoring Unit
ON
Optical Network
ONSA
Openreach Network Services Agreement
ONT
Optical Network Termination (Home equipment)
OPEX
Operational Expenditure
OPM
Optical Power Meter
OPS
Optical Patching Shelf
OR
Openreach
ORMP
OpenReach Marketable Premises
ORSRIMS
OpenReach Service & Resource Inventory Management System
ORWFMT
OpenReach Work Flow Management Tool
OS
Ordnance Survey
OSA
Optical Spectrum Access
OSAS
Optical Stand Alone Survey
OSS
Operating Support Systems
OTA
Office of the Telecommunications Adjudicator
OTDR
Optical Time Domain Reflectometer
OTH
Optical Test Head
OTIAN
Optical Telecommunication In the Access Network
OTU
Optical Test Unit
OWT
One Way Transmission
P
P&B
Plan and Build
P2P (PTP)
Point To Point
P2MP
Point to MultiPoint
PAF
Postcode Address File
PAS
Public Availability Specification
PASMA
Prefabricated Access Suppliers' and Manufacturers' Association
PBX
Private Branch Exchange
PCP
Primary Cross-connection Point (also referred to as a Cab (cabinet))
PCI
Pre-Construction Information
PDU
Power Distribution Unit
PDF (.pdf)
Portable Document Format
PE
PolyEthylene
PENC/S
Public Electronic Communications Network/Service
PER
Power Equipment Rack
PET
Permanently engaged tone
PeT
Cable Polyethylene Twin
PEU
Pole Erection Unit
PeUT
Cable Polyethylene Unit Twin
PEW
Planned Engineering Works
PIA
Physical Infrastructure Access
PIMR
Passive Infrastructure Market Review
PINES
Planning Intelligent Notes Entry System
PIPeR
Physical Inventory of Plant and engineering Records
PJL
Post Joint Large (TfL equivalent of a jointing post)
PMC
Pole Mounted Closure
POC
Proof Of Concept
POE
Point Of Entry (box)
POI
Point Of Intervention
PON
Passive Optical Network
PoP
Point of Presence
POS
Provision Of Service
POTS
Plain Old Telephony Service
PPR
Proactive Pressure Repair
ppt
pair per tenancy
PQ
Pair Quality
PQT
Pail Quality Test
PSN
Primary Splitter Node
PSTN
Public Switched Telephone Network
PSU
Power Supply Unit
PTD
Permission To Dig
PTO
Precision Test Officer
PTP (P2P)
Point To Point
PTW
Permission To Work
Q
QA
Quality assurance
R
RABiT
Rapid Assessment BT incident Tracker
RACI
Responsible Accountable Consulted Informed
RAMS
Risk And Method Statement
RARA
Ring Ahead - Ring After (Contacting the end user)
RAT
Request Automatic Test
RBAT
Request Background Automatic Test
RBD
Required By Date
RCKN
Reduced Cost Kilostream Network
RCR
Route Cause Repair
RDSLAM
Remote Digital Subscriber Line Access Multiplexer (Remote DSLAM)
REIN
Repetitive Electrical Impulse Noise
REN
Ringing Equivalent Number
RET
Request Exchange Test
RFI
Request For Information
RFI
Ready For Install
RH
Relative Humidity
RFS
Ready For Service / Sending
RFT
Right First Time
RHS
Right-Hand-Side
RLT
Request Line Test
RMS
Root Mean Square
RO1
Resilience Option 1
RO2
Resilience Option 2
ROC
RoCDrop (Cable)
ROHS
Restriction of Hazardous Substances
RoI
Risk of Investment
ROSE
Routing Of Simple Exchange lines
RPA
Robotic Process Automation (RPA) recruits
RSA
Road Safety Audit
RSP
Report Spine Planner
RT
Ribbon Tray
RTP
Ring Trip
RTWF
Real Time Work Flow
RU
Remote Unit
RUE
Remote Unit Emulation
RWT
Right When Tested
S
SAC
Stand Alone Cabinet
SAM
Skill Alliance Module
SAPL
Single Address Point Locking Tray
SAS
Stand Alone Survey
SASA
Splitter Array Sub-Assemblies
SC
Shallow Climbable (Pole classification)
SC
Standard Connector
SC-APC
Subscriber Connector - Angled Physical Contact
SCBT
Splitter Connector Block Terminal
SCF
Security Critical Function
SCP
Secondary Cross-connection Point
SD
Service Delivery
SDH
Synchronous Digital Hierarchy
SDP
Splitter Distribution Point
SDMB
SDMB - Sub Duct Mono Bore
SDEDS
Secure Data Exchange and Distribution System
SDP
Splitter Distribution Point
SDR
Standard Dimension Ratio
SDSL
Symmetric Digital Subscriber Line
SDU
Single Dwelling Unit
SEP
Superfast Extension Programme
SFA
Super Fast Access
SFFA
Super Fast Fibre Access
SFFB
Super Fast Fibre Broadband
SFP
Small Form-factor Pluggable
SFW
Single Fibre Working
SHDSL
Symmetric Hi-Speed Digital Subscriber Line
SHE
Subtended Head-End
SI
Self Install
SID
Strategic Infrastructure Development unit
SIN
Supplier Information Note (BT publication)
SLA
Service Level Agreement
SLG
Service Level Guarantee
SLU
Sub Loop Unbundling
SMC
Service Management Centre
SME
Subject Matter Expert
SME
Small and Medium Enterprises
SMP
Significant Market Power
SMPF
Shared Metallic Path Facility
SMS
Short Message Service
SMT
Senior Management Team
SNAP
Single Network Accommodation Process
SNC
Significant Non-Compliance
SNOW
Service Notice Of Works
SOAP
Supplier Operational Auditor Process
SOC
Security Operation Centre
SOD
Service On Demand
SOF
Shelf Optical Fibre
SOGEA
Single Order VDSL
SOGFAST
Single Order G.fast
SoHo
Small office/Home office
SOR
Statement Of Requirement
SP & M
Sales, Product And Marketing
SPM
Subs Private Meter
SPN
Splitter Node
SRM
Sales and Relationship Manager
SRU
Small Remote Unit
SSFP
Service Specific Face Plate
SSSI
Site of Special Scientific Interest
SSRAMS
Site Specific Risk Assessment and Method Statement
SST
Standard Single Tube
SST Y
Standard Single Tube (type) Y
STAA
Strategic Transaction Automation Architecture
STC
Safe To Connect
STEM
Science, Technology, Engineering, Maths
SWF
Single Working Fibre
SYSX
System X type exchange
SYSY
System Y type exchange (also known as AXE10)
T
T & D
Test And Diagnostics
T2R
Trouble to Resolve (Cost to business, previously known as Maintenance)
TADDS
Test and Diagnostics Data Store
TAM
Test Access Matrix
TAN
Test Access Number
TCD
Target Completion Date
TCP
21st ( T ) System Planning
TCP
Transmission Control Protocol (part of Internet protocol suite)
TDFS
Technical Departure From Specification
TDR
Time Domain Reflectometer
TfL
Transport for London
TH
Test Head
THP
Total Homes Passed
TIJ
Tube Interception Joint
TJ
Tube Joint
TM
Termination Multi-function (TM series of nodes)
TMA
Traffic Management Act
TMS
TAM Management System
TN
Test Network
TNOK
Test Not OK (There is a fault on the line)
ToC
Test on Completion
TOK
Test OK
TOR
Terms Of Reference
TOS
Temporary Out of Service
TPET
Third Party Engaged Tone
TPON
Telephony over Passive Optical Networks
TPR
Tie Pair Reconfiguration
TRC
Time Related Charge
TSC
Test System Controller
TSO
Technology, Service & Operations
TWP
Trialists Working Party
U
UAT
User Acceptance Testing
UBB
Ultra BroadBand
UBC
Universal Broadband Commitment
UCAO
Universal Closure Access Optical (now refer to MPE)
UFS
Universal Fibre Solution
UG
Underground
UII
Unified Inventory Interface
ULW
Ultra LightWeight
UPB
Universal Pole Bracket
UPRN
Unique Property Reference Number
USC
Universal Service Commitment
USO
Universal Service Obligation
V
VAL
Vulnerable Area Locator
VDS
Vendor Direct Shipped
VDSL
Very high speed Digital Subscriber Line
VIAVI
VIAVI (formally known as JDSU) – manufacturer of hand held tester
VMJ
View My Job
VoD
Video on Demand
VoIP
Voice over Internet Protocol
VTU
Vertical Termination Unit
W
W & V
Wholesale & Ventures
WAC
Work Allocation Control
WAN
Wide Area Network
WAU
Work Allocation Unit
WBC
Wholesale Broadband Connect
WD
Working Days
WDM
Wavelength Division Multiplexing
WFA
Work Flow and Allocation
WIP
Work In Progress
WLAMR
Wholesale Local Access Market Review
WLA
Wholesale Local Access
WLR
Wholesale Line Rental
WM
Work Manager
WO
Work Order
WOOSH
Web based Out Of Service Handling
WRF
Work Request Form
WTTC
Wireless to the Cab
WWR
While We’re There - service provided to CPs
X
xDSL
Digital Subscriber Line
XL
Crossed lines
XML
eXtensible Mark-up Language