Glossary of terms

AAI-48

48-bit Administratively Assigned Identifier

AAI-64

64-bit Administratively Assigned Identifier

ACK

Acknowledgement

ADEV

Allan deviation

AP

(Wireless LAN) Access Point

ARB

Arbitrary

ARTC

Arbitrary Reference Time Clock

AV

Audio/Video

AVB

Audio/Video Bridging

BC

Boundary Clock (see T-BC)

BITS

Building Integrated Timing Source

BMC

Best Master Clock

BMCA

Best Master Clock Algorithm

BPSK

Binary Phase Shift Keying

CAN

Controller Area Network

CDMA

Code Division Multiple Access

CES

Circuit Emulation Service

CID

Company ID

CMI

Coded Mark Inversion

CMLDS

Common Mean Link Delay Service

CP

Communication Profile (according to IEC 61784-1:200710)

CPF

Communication Profile Family (according to IEC 61784-1:2007)

CPRI

Common Public Radio Interface (a specification for radio over fibre produced by the CPRI consortium, www.cpri.info)

CSMA/CD

Carrier Sense Multiple Access with Collision Detection

CSN

Coordinated Shared Network

CTC

Channel Time Clock

cTE

constant Time Error

DAN

Dual Attached Node

DANH

Dual Attached Node with HSR protocol

DSL

Digital Subscriber Line

DSLAM

Digital Subscriber Line Access Multiplexer

dTE

dynamic Time Error

E2E

End-to-End

EC

Equipment Clock

EEC

Ethernet Equipment Clock

EEC

synchronous Ethernet Equipment Clock

enhanced Ethernet Equipment Clock (the enhanced SyncE clock defined in G.8262.1)

ELI-48

48-bit Extended Local Identifier

ELI-64

64-bit Extended Local Identifier

EPON

IEEE 802.3 Ethernet passive optical network (as specified in IEEE Std 802.3-2008)

enhanced Primary Reference Time Clock (defined in G.8272.1)

Radio Equipment (eCPRI term for the physical-layer processing within the basestation; equivalent to the RRU or RRH)

ESMC

Ethernet Synchronization Messaging Channel

ESS

Extended Service Set

ETH

Ethernet MAC layer network

ETY

Ethernet PHY layer network

EUI-48

48-bit Extended Unique Identifier

EUI-64

64-bit Extended Unique Identifier

FCS

Frame Check Sequence

FDD

Frequency Division Duplexing

FFM

Flicker Frequency Modulation

FFO

Fractional Frequency Offset

FM

Frequency Modulation

FPC

Floor Packet Count

FPM

Flicker Phase Modulation

FPP

Floor Packet Percent

FPR

Floor Packet Rate

FTM

Fine Timing Measurement

G.hn

ITU-T G.9960 and ITU-T G.9961

GBAS

Ground Based Augmentation System

GbE

Gigabit Ethernet

GM

Grandmaster (see T-GM)

GMT

Greenwich Mean Time

GNSS

Global Navigation Satellite System (generic name for the various satellite-based navigation and time distribution services, e.g. GPS, GLONASS, Beidou etc)

GPON

Gigabit-capable Passive Optical Network

GPS

Global Positioning System

gPTP

generalized Precision Time Protocol (see PTP)

HRM

Hypothetical Reference Model

HRPD

High Rate Packet Data

IANA

Internet Assigned Numbers Authority

ICV

Integrity Check Value

HSR

High availability Seamless Redundancy

IP

Internet Protocol

IPv4,6

IPv6 Internet Protocol version 4 / 6

IRNSS

Indian Regional Navigation Satellite System

IS

Integration Service

ISO

International Organization for Standardization

ISS

Internal Sublayer Service

IWF

Inter-Working Function

JD

Julian Date

JDN

Julian Day Number

LAN

Local Area Network

LCI

Location Configuration Information

LLC

Logical Link Control

LTE

Long Term Evolution

LTE-A

Long Term Evolution – Advanced

M2M

Machine to Machine

MAC

Media Access Control (according to IEEE Std 802.3-2005)

MACsec

Media Access Control security

MAFE

Maximum Average Frequency Error

MA-L

MAC Addresses Large

MA-M

MAC Addresses Medium

MAN

Metropolitan Area Network

MA-S

MAC Addresses Small

MATIE

Maximum Average Time Interval Error

max|TE|

Maximum absolute Time Error

MBMS

Multimedia Broadcast Multicast Service

MBSFN

MBMS based on Single Frequency Network

MD

Media-Dependent

MDEV

Modified Allan Deviation

MII

Media-Independent Interface

MJD

Modified Julian Day

MLME

MAC Layer Management Entity (IEEE 802.11)

MPCP

MultiPoint Control Protocol (IEEE 802.3)

MPDPDU

MPCP Data Unit (IEEE 802.3)

MTIE

Maximum Time Interval Error

NE

Network Element

NIST

National Institute of Standards and Technology (see www.nist.gov)

NRZ

Non-Return to Zero

NTP

Network Time Protocol

NUI-48

48-bit Network Unique Identifier

NUI-64

64-bit Network Unique Identifier

OAM

Operations, Administration and Maintenance

OC

Ordinary Clock

OFD

Observed Floor Delay

OLT

Optical Line Terminal (IEEE 802.3)

ONT

Optical Network Terminal

ONU

Optical Network Unit (IEEE 802.3)

OSC

Optical Supervisory Channel

OSSP

Organization-Specific Slow Protocol

OTN

Optical Transport Network

OUI

Organizational Unique Identifier (allocated by the IEEE)

P2P

Peer-to-Peer

PAM

Pulse Amplitude Modulation

PDV

Packet Delay Variation

PEC

Packet-based Equipment Clock

PDU

Protocol Data Unit

PEC-S

Packet-based Equipment Clock Slave

PHY

Physical layer (according to IEEE Std 802.3-2005)

PICS

Protocol Implementation Conformance Statement

PLL

Phase-Locked Loop

PM

Phase Modulation

PNT-F

Packet Network Timing Function

PP

Packet Processing

ppm

parts per million

PPS

Pulse Per Second

PRC

Primary Reference Clock

PRTC

Primary Reference Time Clock (defined in G.8272)

PSN

Packet Switched Network

PTP

Precision Time Protocol (defined in IEEE1588)

PRP

Parallel Redundancy Protocol

QZSS

Quasi-Zenith Satellite System

RE

Radio Equipment (CPRI term for the physical-layer processing within the basestation; equivalent to the RRU or RRH)

REC

Radio Equipment Controller (CPRI term for the upper-layer processing within the basestation; equivalent to the BBU)

RF

Radio Frequency

Remote Radio Head (physical layer processing within a basestation; another name for the RRU; equivalent to the CPRI term RE)

RT-DSLAM

Remote Terminal-Digital Subscriber Line Access Multiplexer

RTT

Radio Transmission Technology

RTT

Round-Trip Time

RWFM

Random Walk Frequency Modulation

SA

Security Associations

SAI-48

48-bit Standard Assigned Identifier

SAI-64

64-bit Standard Assigned Identifier

SBAS

Satellite Based Augmentation System

SDH

Synchronous Digital Hierarchy

SEC

SDH Equipment Clock

SFD

Start Frame Delimiter

SM

State Machine

SNTP

Simple Network Time Protocol

SOF

Start of Frame

SSM

Synchronization Status Message

SSMB

Synchronization Status Message Byte

SSU

Synchronization Supply Unit

STA

Station

STM

Synchronous Transport Module

STM-N

Synchronous Transport Module-N

SyncE

Synchronous Ethernet

TAI

Temps Atomique International (international atomic time)

T-BC

Telecom Boundary Clock (defined in G.8273.2)

TC

Traffic Class

TC

Transparent Clock (see T-TC)

TDD

Time Division Duplexing

TDEV

Time Deviation

TDM

Time Division Multiplexing

TDMA

Time Division Multiple Access

TD-SCDMA

Time Domain Synchronized CDMA

TE

Time Error

TG

Task Group

T-GM

Telecom Grandmaster (defined in G.8273.1)

TIE

Time Interval Error

TLV

Type, Length, Value (according to IEEE Std 802.1AB)

ToD

Time of Day

ToS

Type of Service

TS

TimeStamp

T-TC

Telecom Transparent Clock (defined in G.8273.3)

T-TSC

Telecom Time Slave Clock (defined in G.8273.2)

UCMM

UnConnect Message Manager

UCT

UnConditional Transfer

UDP

User Datagram Protocol

UDP/IP

User Datagram Protocol (see IETF RFC 768 B5) / Internet Protocol

UI

Unit Interval

UTC

Coordinated Universal Time

UTC

Universal Time Co-ordinated

UTRA

Universal Terrestrial Radio Access

VCO

Voltage Controlled Oscillator

VLAN

Virtual Local Area Network

WCDMA

Wideband CDMA

WDM

Wavelength Division Multiplexing

WFM

White Frequency Modulation

WG

Working Group

WiMAX

Worldwide Interoperability for Microwave Access

WLAN

Wireless Local Area Network

xDSL

x-type Digital Subscriber Line

xPON

x Passive Optical Network

2G term for a basestation

3G term for a basestation

4G term for a basestation

Generic terms

 CPRI terms

BBU

REC

RRU, RRH

RE

5G term for a basestation

Generic terms

 eCPRI terms

CU

eREC

DU

RRU, RRH

eRE