Glossary

DSL Related

DSL

Digital Subscriber Line

ADSL

Asynchronous Digital Subscriber Line

VDSL

Very-high-bit-rate Digital Subscriber Line

FTTC

Fibre to the Cabinet

FTTP

Fibre to the Premises

TAM

Test Access Module

BRAS

Broadband Remote Access Server

CPE

Customer Premise Equipment (router or modem)

DSLAM

Digital Subscriber Line Access Modulator

DLM

Dynamic Line Management

VP

Virtual Path - a link between an Exchange and the BRAS

BT Fault Terms

BBCR

BroadBand Customer Reporting (BT)

BBEU

WBC EUA Service ID (Circuit ID)

CRD

Customer Required by Date

CP

Communications Provider

ELF

Early Life Failure - A fault soon after an install

CDTA

Conscious Decision To Appoint - force booking a Openreach engineer

DP

Distribution Point

KBD

Knowledge Based Diagnostics

KCI

Keep Customer Informed

MFL

Main Fault Location

KCI

Keeping Customers Informed (BT term)

EU:End User

CA

Customer Apparatus

MPF

Metallic Path Facility

MBORC

Matters Beyond Our Reasonable Control. Used by BT to indicate that they're suspending normal fix guarantees as some external event has made it impossible to achieve them (e.g. a fire, storms, terror attack).

AI

Action Item

WAC

Work Allocation Controls (team)

PONR

Point of Now Return - eg when an engineer is booked and cannot now be cancelled.

PCP

Primary Cross-connect Point

PEW

Planned Engineering Works

POH

Point of Handover

RA

Rate Adaptive

REIN

Repetitive Electrical Impulse Noise

RWT

Right When Tested

SIN

Supplier Information Note [BT]

SMTP

Shared Metallic Path Facility

SP

Service Provider (eg AAISP)

SSFP

Service Specific Front Plate

WLR

Wholesale Line Rental

NTE

Network Termination Equipment

NTE5

Network Termination Equipment, 5th version

BT Fault Locations

CA

Fault located at Customer Apparatus

DT

Diagnostic Test required to establish fault

EX

Fault located in Exchange

LN

Fault Located in Local Network

CE

Fault located at Customer Equipment. Provides further breakdown of a CA fault

FU

Fault Located at Frames Unit. Provides further breakdown of an EX fault.

Openreach PSTN Fault Types

Terms used to describe a fault type on a PSTN phone line. When reporting a PSTN fault to Openreach one of these terms is used to describe the fault.

BNR

Bell not ringing

BR

Bell ringing continuous

CCS

Call minder problems

CDT

Continuous Dial Tone

CO

Cuts off

DRO

Damage to aerial cables

DRU

Damage outside end user premises

DRW

Damage at the end users site

DRA

Damage Report Apparatus

FNT

Faint Transmission

MOD

No other equipment, retried

NDT

No dial tone

NR

Dial tone no answer

NSY

Noisy

NT

No Tone

NU

Number not Obtainable

OHR

Overhearing

OWT

One Way Transmission

PET

Permanently engaged tone

RTP

Ring Trip

UTR

Unable to trip ringing

WNO

Wrong Numbers Obtained

XL

Crossed lines

ESF

Exchange Service Facility

Services Related

BT

British Telecom

BTOR

British Telecom Openreach

OR

Openreach

BTW

BT Wholesale

TTW

TalkTalk Wholesale

DNS

Domain Name System/Server

VoIP

Voice over Internet Protocol

CDR

Call Detail Records - Call logs

SIP:Session Initiation Protocol - Sets up a VoIP call.

DS

Delegation signer (The record used to identify the DNSSEC signing key of a delegated zone)

IDN

Internationalised Domain Name

IP

Internet Protocol

CQM

Constant Quality Monitoring - the name given to the monitoring graphs used on the control pages and FireBricks

RIPE

The Réseaux IP Européens Network - the organisation in Europe who manage IP addresses

SIM

Subscriber identity module

CLI

Caller Line Identification (re telephony)

CLI

Command Line Interface

Email Related

POP3

Post Office Protocol, Version 3

IMAP

Internet Message Access Protocol

SMTP

Simple Mail Transfer Protocol

Network Related

MTU

Maximum Transmission Unit

MRU

Maximum Receive Unit

IP

Internet Protocol

TCP

Transmission Control Protocol

PPP

Point to Point Protocol

LCP

Link Control Protocol

L2TP

Layer 2 Tunneling Protocol