Introduction to Traditional Telecom Wireline Services Acronyms

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In the telecommunications industry, traditional wireline services remain fundamental to global communication networks. Understanding the terminology related to these services is essential for professionals in this field. From infrastructure components to network protocols, a thorough grasp of these acronyms can significantly enhance your ability to manage and optimize telecom services. 

This resource is designed specifically for IT, finance, and telecommunications professionals working within large enterprises. Our goal is to provide you with a useful guide to the most used acronyms in traditional telecom wireline services, ensuring you have quick and easy access to the terms you encounter daily. Additional resources are available via the Gartner glossary.

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Each acronym is accompanied by its full form and a brief description to provide context and enhance your understanding.

Traditional Telecom Wireline Services Acronyms

AAL – ATM Adaptation Layer 

ALC – Automatic Level Control 

AMI – Alternate Mark Inversion 

AN – Access Network 

ANSI – American National Standards Institute 

AP – Access Point 

APM – Advanced Power Management 

ARP – Address Resolution Protocol 

ASE – Amplified Spontaneous Emission 

ASR – Automatic Speech Recognition 

ASP – Application Service Provider 

ATM – Asynchronous Transfer Mode 

BERT – Bit Error Rate Test 

BER – Bit Error Rate 

BGP – Border Gateway Protocol 

BOM – Bill of Materials 

BPL – Broadband over Power Lines 

BRI – Basic Rate Interface 

BSS – Base Station Subsystem 

BSS – Business Support System 

CATV – Community Antenna Television 

CBR – Constant Bit Rate 

CCF – Customer Care Framework 

CCS – Common Channel Signaling 

CFR – Code of Federal Regulations 

CIR – Committed Information Rate 

CLEC – Competitive Local Exchange Carrier 

CLI – Command Line Interface 

CLS – Central Link Switch 

CM – Configuration Management 

CMDA – Code Division Multiple Access 

CMTS – Cable Modem Termination System 

CPE – Customer Premises Equipment 

CSP – Communications Service Provider 

CSU/DSU – Channel Service Unit/Data Service Unit 

CW – Continuous Wave 

CWDM – Coarse Wavelength Division Multiplexing 

DAC – Digital to Analog Converter 

DACS – Digital Access and Cross-Connect System 

DDF – Digital Distribution Frame 

DECT – Digital Enhanced Cordless Telecommunications 

DHCP – Dynamic Host Configuration Protocol 

DNS – Domain Name System 

DOCSIS – Data Over Cable Service Interface Specification 

DSL – Digital Subscriber Line 

DSLAM – Digital Subscriber Line Access Multiplexer 

DS3 – Digital Signal 3 

DWDM – Dense Wavelength Division Multiplexing 

E1 – European Basic Rate (2.048 Mbps) 

EAP – Extensible Authentication Protocol 

EIGRP – Enhanced Interior Gateway Routing Protocol 

ELFEXT – Equal Level Far End Cross-Talk 

EON – Elastic Optical Network 

EPON – Ethernet Passive Optical Network 

ESN – Electronic Serial Number 

FAS – Frame Alignment Signal 

FDDI – Fiber Distributed Data Interface 

FDM – Frequency Division Multiplexing 

FEC – Forward Error Correction 

FEXT – Far End Crosstalk 

FMC – Fixed-Mobile Convergence 

FOTS – Fiber Optic Transmission System 

FTP – File Transfer Protocol 

FTTC – Fiber to the Curb 

FTTH – Fiber to the Home 

FTTN – Fiber to the Node 

FTTP – Fiber to the Premises 

FWA – Fixed Wireless Access 

G.703 – ITU-T standard for transmitting voice and data 

G.704 – ITU-T standard for framing signals 

G.705 – ITU-T standard for functions and interworking 

G.706 – ITU-T standard for frame alignment 

G.707 – ITU-T standard for network node interface 

G.708 – ITU-T standard for control of digital hierarchy 

G.709 – ITU-T standard for optical transport network 

G.711 – ITU-T standard for audio companding 

G.729 – ITU-T standard for audio data compression 

GPON – Gigabit Passive Optical Network 

GSM – Global System for Mobile Communications 

GSM-R – Global System for Mobile Communications – Railway 

GMR – Global Mobile Radio 

HDLC – High-Level Data Link Control 

HDSL – High bit-rate Digital Subscriber Line 

HFC – Hybrid Fiber-Coaxial 

HTTP – HyperText Transfer Protocol 

HTTPS – HyperText Transfer Protocol Secure 

ICT – Information and Communication Technology 

ICMP – Internet Control Message Protocol 

IEEE – Institute of Electrical and Electronics Engineers 

IETF – Internet Engineering Task Force 

IGMP – Internet Group Management Protocol 

IGP – Interior Gateway Protocol 

ILEC – Incumbent Local Exchange Carrier 

IMAP – Internet Message Access Protocol 

IP – Internet Protocol 

IPX – Internetwork Packet Exchange 

IPv4 – Internet Protocol version 4 

IPv6 – Internet Protocol version 6 

ISDN – Integrated Services Digital Network 

ISP – Internet Service Provider 

ITU – International Telecommunication Union 

ITU-T – International Telecommunication Union – Telecommunication Standardization Sector 

IXC – Interexchange Carrier 

LACP – Link Aggregation Control Protocol 

LAN – Local Area Network 

LATA – Local Access and Transport Area 

LDAP – Lightweight Directory Access Protocol 

LLDP – Link Layer Discovery Protocol 

LLC – Logical Link Control 

LOS – Line of Sight 

MAC – Media Access Control 

MAN – Metropolitan Area Network 

MDF – Main Distribution Frame 

MEF – Metro Ethernet Forum 

MGCP – Media Gateway Control Protocol 

MIMO – Multiple Input Multiple Output 

MPLS – Multi-Protocol Label Switching 

MPLS-TP – MPLS Transport Profile 

MST – Multiple Spanning Tree 

MSTP – Multiple Spanning Tree Protocol 

MUX – Multiplexer 

NANP – North American Numbering Plan 

NAS – Network Attached Storage 

NAT – Network Address Translation 

NEXT – Near-End Crosstalk 

NID – Network Interface Device 

NOC – Network Operations Center 

NR – New Radio (5G) 

NRZ – Non-Return-to-Zero 

OC – Optical Carrier 

OC-3 – Optical Carrier 3 

OC-12 – Optical Carrier 12 

OC-48 – Optical Carrier 48 

OC-192 – Optical Carrier 192 

OC-768 – Optical Carrier 768 

OAM – Operations, Administration, and Maintenance 

OAM&P – Operations, Administration, Maintenance, and Provisioning 

OFDMA – Orthogonal Frequency Division Multiple Access 

OLT – Optical Line Terminal 

ONT – Optical Network Terminal 

OEO – Optical-Electrical-Optical 

OLS – Optical Line System 

O-RAN – Open Radio Access Network 

OSS – Operations Support System 

P2P – Point-to-Point 

PAT – Port Address Translation 

PBX – Private Branch Exchange 

PDH – Plesiochronous Digital Hierarchy 

PIM – Protocol Independent Multicast 

PON – Passive Optical Network 

POP – Post Office Protocol 

PPE – Premises Equipment 

PSTN – Public Switched Telephone Network 

PTT – Push-to-Talk 

PTP – Precision Time Protocol 

QAM – Quadrature Amplitude Modulation 

QoS – Quality of Service 

RADIUS – Remote Authentication Dial-In User Service 

RAN – Radio Access Network 

RAS – Remote Access Service 

RARP – Reverse Address Resolution Protocol 

RFI – Radio Frequency Interference 

RFOG – Radio Frequency over Glass 

RJ – Registered Jack 

ROADM – Reconfigurable Optical Add-Drop Multiplexer 

RSVP – Resource Reservation Protocol 

RTP – Real-Time Protocol 

RSTP – Rapid Spanning Tree Protocol 

RTC – Real-Time Communication 

RTT – Round Trip Time 

SAN – Storage Area Network 

SDH – Synchronous Digital Hierarchy 

SDN – Software-Defined Networking 

SDSL – Symmetric Digital Subscriber Line 

SFP – Small Form-factor Pluggable 

SHDSL – Single-Pair High-Speed Digital Subscriber Line 

SIP – Session Initiation Protocol 

SIP-T – Session Initiation Protocol for Telephones 

SLA – Service Level Agreement 

SNMP – Simple Network Management Protocol 

SONET – Synchronous Optical Networking 

SSL – Secure Sockets Layer 

STP – Spanning Tree Protocol 

STM – Synchronous Transport Module 

STS – Synchronous Transport Signal 

TA – Terminal Adapter 

TAPI – Telephony Application Programming Interface 

TCM – Trellis-Coded Modulation 

TCP – Transmission Control Protocol 

TE – Traffic Engineering 

TDM – Time Division Multiplexing 

TIA – Telecommunications Industry Association 

TIP – Telecom Infra Project 

TLS – Transport Layer Security 

TMI – Telecommunication Management Infrastructure 

TSP – Telecommunication Service Provider 

UDP – User Datagram Protocol 

VDSL – Very-high-bit-rate Digital Subscriber Line 

VDSL2 – Very-high-bit-rate Digital Subscriber Line 2 

VLAN – Virtual Local Area Network 

VoDSL – Voice over DSL 

VoIP – Voice over Internet Protocol 

VPN – Virtual Private Network 

WAN – Wide Area Network 

WDM – Wavelength Division Multiplexing 

WEP – Wired Equivalent Privacy 

WLAN – Wireless Local Area Network 

WPA – Wi-Fi Protected Access 

WPA2 – Wi-Fi Protected Access 2 

xDSL – Various types of Digital Subscriber Line technologies

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Rob Halik is a Senior Analyst at Tellennium, specializing in Managed Mobility Services, Telecom Expense Management, and Utility Bill Management. With over 25 years of industry experience, Rob provides enterprise expense management insights to help businesses optimize their operations and reduce costs. This article is a collaborative effort by our expert team members at Tellennium, including Greg McIntyre, Shawn Veitz, Matt McIntyre, and Todd Givens, who collectively bring over 100 years of industry experience.

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