Glossary of Terms

A

Acronym	Description
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.
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
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

Acronym	Description
BCD	Business and Corporate Delivery
B2B	Business to Business
BAU	Business As Usual
BB	Broadband
BBU	Battery Back Up
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

Acronym	Description
C2M	Concept to Market
CA	Customer Apparatus
Cab	Short name for cross-connection street cabinet (See PCP)
CAD	Corporate Active Directory
CBT	Connectorised Block Terminal
CCD	Customer Committed Date
CCT	Circuit
CDD	Contractual Delivery Date
CEO	Chief Executive Officer
CFI	Customer Focused Investment
CLI	Calling Line Identity
CO	Central Office (Exchange)
CP	Communications Provider
CPE	Customer Premises Equipment
CSP	Customer Service Point / Splicing Point

D

Acronym	Description
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 / 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 / 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 / Discrete Façade
DFW	Dual Fibre Working
DFX	Dark Fibre eXchange
DH	Data Hall
DHCP	Dynamic Host Control Protocol
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

Acronym	Description
E-Side	Exchange Side (of a PCP, aka M-Side, Main Side)
EAD	Ethernet Access Direct
EBLC	EmBedded Line Card
ECC	Excess Construction Charges / 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 / Energy Networks Association
EO, E/O	Exchange Only (cable)
EOI	Equivalence Of Input
EoSL	End of Service Life
ES	Engineering Services
ESRI	Environmental Science Research Institute
ESV	Ethernet Single Visit
ETSI	European Telecommunications Standards Institute
EU	End User / European Union / Exchange Unit
EvoTAM	Evolutionary Test Access Matrix
EX	Exchange
EXFO	Type of Remote Test Unit (hand-held tester)

F

Acronym	Description
F	Fibre
FACT	Front Access Connector Tray
FBC	Field Based Co-ordinator
FBWP	FaceBook WorkPlace
FDP	Fibre Distribution Point / 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 / 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)
FTTRN	Fibre To The Remote Node
FU	Frames Unit
FVA	Fibre Voice Access

G

Acronym	Description
G.fast	G.9700/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

Acronym	Description
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 (copper fault)
HRD	High-Reflectance Demarcation
HTTP	Hyper Text Transfer Protocol
HYDRA	Fibre optic cables used in the Optical connection rack
Hz	Hertz

I

Acronym	Description
ICB	Incoming Calls Barred
ICE	Infrastructure Clearance and Extraction
ICNIRP	Radiation Protection Commission
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

Acronym	Description
JB	Joint Box
JDSU	VIAVI (Tester Manufacturer)
JF(x)	Joint Box Footway (size reference)
JP	Joint Post
JPPA	Job Pack Production Assistant
JRB	Joint Box Reinforced Brick
JRC	Joint Box Reinforced Concrete
JUF	Joint box Unreinforced Footway

K

Acronym	Description
KBD	Knowledge Based Diagnostics
KCI	Keeping Customers Informed
KJC	Kit Joint Closure
kHz	KiloHertz
km	Kilometre

L

Acronym	Description
L2C	Lead To Cash (Provision)
L2S	Layer 2 Switch
L2W	Licence to Work
LA	Local Access / Authority
LAD	Local Access Dataset
LAG	Link Aggregation Group
LAN	Local Area Network
LC	Line Card / Fibre connector type
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	LLU Commingling
LLUMS	LLU 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

Acronym	Description
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
MMPF	Multiple Metallic Path Facility
MMR	MeetMe Room
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
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

Acronym	Description
NA	No Access / 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 / 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
Not Spot	Area with no broadband coverage
NOU	Network Operations Unit
NR	No Reply
NRSWA	New Roads and Street Works Act
NSP	Non Served Premises
NSY	Noisy
NRT	Network Repair Team
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

Acronym	Description
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
OMP	Openreach Marketable Premises
OMU	Openreach Monitoring Unit
ON	Optical Network
ONSA	Openreach Network Services Agreement
ONT	Optical Network Termination
OPEX	Operational Expenditure
OPM	Optical Power Meter
OPS	Optical Patching Shelf
OR	Openreach
ORMP	OpenReach Marketable Premises
ORSRIMS	OR Service & Resource Inventory Management System
ORWFMT	OR Work Flow Management Tool
OS	Ordnance Survey
OSA	Optical Spectrum Access
OSAS	Optical Stand Alone Survey
OSS	Operating Support Systems
OTA	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

Acronym	Description
P&B	Plan and Build
P2P	Point To Point
P2MP	Point to MultiPoint
PAF	Postcode Address File
PAS	Public Availability Specification
PASMA	Access Suppliers' and Manufacturers' Association
PBX	Private Branch Exchange
PCP	Primary Cross-connection Point (Cabinet)
PCI	Pre-Construction Information
PDU	Power Distribution Unit
PE	PolyEthylene
PENC/S	Public Electronic Communications Network
PER	Power Equipment Rack
PET	Permanently engaged tone
PeT	Cable Polyethylene Twin
PEU	Pole Erection Unit
PEW	Planned Engineering Works
PIA	Physical Infrastructure Access
PIMR	Passive Infrastructure Market Review
PINES	Planning Intelligent Notes Entry System
PIPeR	Physical Inventory of Plant Records
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
PQ	Pair Quality
PSN	Primary Splitter Node
PSTN	Public Switched Telephone Network
PSU	Power Supply Unit
PTD	Permission To Dig
PTW	Permission To Work

Q

Acronym	Description
QA	Quality assurance

R

Acronym	Description
RABiT	Rapid Assessment BT incident Tracker
RACI	Responsible Accountable Consulted Informed
RAMS	Risk And Method Statement
RARA	Ring Ahead - Ring After
RAT	Request Automatic Test
RBAT	Request Background Automatic Test
RBD	Required By Date
RCKN	Reduced Cost Kilostream Network
RCR	Route Cause Repair
RDSLAM	Remote DSLAM
REIN	Repetitive Electrical Impulse Noise
REN	Ringing Equivalent Number
RET	Request Exchange Test
RFI	Request For Information / Ready For Install
RH	Relative Humidity
RFS	Ready For Service
RFT	Right First Time
RLT	Request Line Test
RMS	Root Mean Square
RO1/RO2	Resilience Options
ROC	RoCDrop (Cable)
ROHS	Restriction of Hazardous Substances
RoI	Risk of Investment
ROSE	Routing Of Simple Exchange lines
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

Acronym	Description
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 / Standard Connector
SC-APC	Subscriber Connector - APC
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	Sub Duct Mono Bore
SDU	Single Dwelling Unit
SFA	Super Fast Access
SFP	Small Form-factor Pluggable
SFW	Single Fibre Working
SLA	Service Level Agreement
SLU	Sub Loop Unbundling
SME	Subject Matter Expert / Small Medium Enterprise
SMP	Significant Market Power
SMS	Short Message Service
SOGEA	Single Order VDSL
SoHo	Small office/Home office
SOR	Statement Of Requirement
SPN	Splitter Node
SRU	Small Remote Unit
SSSI	Site of Special Scientific Interest
SST	Standard Single Tube
SYSX	System X type exchange

T

Acronym	Description
T & D	Test And Diagnostics
T2R	Trouble to Resolve (Maintenance)
TADDS	Test and Diagnostics Data Store
TAM	Test Access Matrix
TCD	Target Completion Date
TCP	Transmission Control Protocol
TDR	Time Domain Reflectometer
TfL	Transport for London
THP	Total Homes Passed
TIJ	Tube Interception Joint
TJ	Tube Joint
TM	Termination Multi-function
TMA	Traffic Management Act
TNOK	Test Not OK
TOK	Test OK
TOR	Terms Of Reference
TOS	Temporary Out of Service
TPON	Telephony over Passive Optical Networks
TRC	Time Related Charge
TSO	Technology, Service & Operations

U

Acronym	Description
UAT	User Acceptance Testing
UBB	Ultra BroadBand
UBC	Universal Broadband Commitment
UCAO	Universal Closure Access Optical
UFS	Universal Fibre Solution
UG	Underground
UII	Unified Inventory Interface
ULW	Ultra LightWeight
UPB	Universal Pole Bracket
UPRN	Unique Property Reference Number
USO	Universal Service Obligation

V

Acronym	Description
VAL	Vulnerable Area Locator
VDS	Vendor Direct Shipped
VDSL	Very high speed Digital Subscriber Line
VIAVI	Tester Manufacturer
VMJ	View My Job
VoIP	Voice over Internet Protocol
VTU	Vertical Termination Unit

W

Acronym	Description
W & V	Wholesale & Ventures
WAC	Work Allocation Control
WAN	Wide Area Network
WBC	Wholesale Broadband Connect
WD	Working Days
WDM	Wavelength Division Multiplexing
WFA	Work Flow and Allocation
WIP	Work In Progress
WLA	Wholesale Local Access
WLR	Wholesale Line Rental
WM	Work Manager
WO	Work Order
WRF	Work Request Form
WTTC	Wireless to the Cab

X-Z

Acronym	Description
xDSL	Digital Subscriber Line
XL	Crossed lines
XML	eXtensible Mark-up Language

Glossary of Terms

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X-Z

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