ISO/IEC 12139-1:2009 情報技術—システム間の電気通信および情報交換—電力線通信（PLC）—高速PLC媒体アクセス制御（MAC）および物理層（PHY）—パート1：一般要件 | ページ 2

3.1

Ad-hoc network

A network consisting of only stations within the boundary of communication through powerlines The ad-hoc network is typically generated in a voluntary manner.

3.2

Backbone

A facility or a collection of facilities for connecting LAN to WAN

3.3

Backoff Period

A period during which stations contend for the medium access

3.4

Backoff Procedure

A procedure to disperse the times at which stations with queued frames attempt transmission

3.5

Backoff Value

The number of time slots that a station shall wait for initiating a transaction

3.6

Bit

3.7

Byte

A unit comprised of a set of bits, the basic unit of data representing '0' or '1' 8 bits constitute 1 byte.

3.8

Carrier Sense

A station's standard for determining whether the medium is currently occupied

3.9

Cell

A synonym for logical network

3.10

Cell Bridge

CB

3.11

Ciphertext

Encrypted data

3.12

Cleartext

Unencrypted data

3.13

Collision

An event of two or more frames colliding in the medium, caused by simultaneous transmission of the frames

3.14

Contention Window

A slotted range in which each station can select a time slot to initiate a transaction

3.15

Delimiter

A combination of preamble and control frame

3.16

Differential Modulation

A modulation that encodes information by the 'phase difference' between two consecutive symbols

3.17

Discrete Multi-Tone

DMT

A modulation technique in which a channel with a certain bandwidth is divided into subchannels (or tones) of narrower bandwidths Each subchannel is modulated by a different subcarrier.

3.18

Flip-flop

A circuit that has two stable states It maintains its state until the input decides on one stable state and another input approves of it by deciding on the other state. It can memorize a bit by corresponding two stable states to '1' and '0'.

3.19

Frame

A synonym for PSDU

3.20

Home Networking

Sharing digital data and constructing an environment with availability of broadband communication by forming a network between information devices at home

3.21

InterFrame Space

A time interval between frames on the medium

3.22

Link Timer

A value that increases at each symbol after the link between two stations is established

3.23

Logical Network

A network classified by Group Identifier (GID) A single physical network can be divided into more than one logical network. Logical Network is a synonym for cell.

3.24

MAC Management Information

MMI

Management information for MAC generated by MAC Management Entity (MME)

3.25

MAC Protocol Data Unit

MPDU

A frame unit that consists of frame header and frame body Frame body contains either MSDU(s) or MMI(s), each in FBB format.

3.26

MAC Service Data Unit

MSDU

A frame unit used in the MAC layer It contains data from link layer.

3.27

Medium BUSY

A medium state indicating that a station has occupied the medium To determine this state, Physical Carrier Sense (PCS) and Virtual Carrier Sense (VCS) are used.

3.28

Medium CONTENTION

A medium state indicating that stations are contending for the medium access It starts after Short Contention InterFrame Space (SCIFS) or Long Contention InterFrame Space (LCIFS) from the end of the last previous transaction.

3.29

Medium IDLE

A medium state indicating that no station has occupied the medium It starts after SCIFS or LCIFS plus maximum Contention Window Size (CWS) from the end of the last previous transaction.

3.30

MAC Interface

ml

The logical interface between the upper link layer and the MAC layer of the station

3.31

Network

A collection of interconnected elements that provides connection services to users

3.32

PHY Interface

pi

The physical interface between the station and powerline

3.33

Privacy

The service to prevent the content of messages from being read by others beside the intended recipients

3.34

Proxy Station

The representative of all stations within a logical network It renders partial Automatic Repeat reQuest (ARQ) possible.

3.35

PHY Service Data Unit

(PSDU)

A frame unit used in physical layer

3.36

Reassembly

The reverse process of segmentation

3.37

Repeater

A station that relays frames from one station to another station for which direct communication is impeded

3.38

Routing Table

A table that maps MAC addresses to Station Identifier (SID) and Tone Map Index (TMI)

3.39

Scrambler

A circuit that converts the input data into random signal series in order to repress the single frequency component by repeating regular data patterns among the successive input data

3.40

Segmentation

A process of partitioning a service block into multiple segments

3.41

Serial Interface

The interface in which all the data are transmitted through the same communication line, bit after bit

3.42

Service Block

A synonym for Frame Body Block (FBB)

3.43

Station

A synonym for PLC Transceiver Unit (PTU)

3.44

Sub-frame

A group of symbols existing in a frame Sub-frame includes the control frame and the data frame.

3.45

Symbol

A bit or a defined sequence of bits

3.46

Symbol Block

A group of symbols processed as one unit in physical layer Its length is always 16 symbols.

3.47

Time Slot

A time unit used in backoff procedure

3.48

Transaction

A minimal set of interactively transmitted/received frames between two stations

3.49

Transaction Combo

A combination of consecutive transactions Except for the first transaction, all transactions in a transaction combo do not contend for the medium. The interframe space between two contiguous transactions in a transaction combo is always Short Response InterFrame Space (SRIFS).

3.50

Transmission Mode

Frame-based transmission scheme Transmission mode is classified into Diversity (DV), Extended DV (EDV), and NORMAL modes.

3.51

VLAN Tag

The field within the layer-2 frame header defined in 802.1 Q