GB/T 5271.25-2000 Information technology vocabulary Part 25: Local area network

This part of the standard is formulated to facilitate international communication in information processing. This standard gives the terms and definitions of concepts related to the field of information processing and clarifies the relationship between these items. This standard defines various types of local area networks, concepts related to local area network equipment, local area network transmission and possible problems with these concepts, and also defines various protocols for managing exchanges. GB/T 5271.25-2000 Information Technology Vocabulary Part 25: Local Area Network GB/T5271.25-2000 Standard download decompression password: www.bzxz.net

GB/T5271.25--2000
This standard is equivalent to the international standard IS0/IEC2382-25:1992 "Information Technology Vocabulary Part 25: Local Area Network". Except for the introduction of the original international standard, this standard is basically consistent with the original international standard in other contents and forms. The purpose of formulating information technology vocabulary standards is to facilitate international communication in information processing. It provides the terms and definitions of concepts related to the field of information processing, and clarifies the relationship between the terms. This standard defines various types of local area networks, related local area network equipment, concepts of local area network transmission and possible problems of these concepts, and also defines various protocols for managing exchanges. The GB/T5271 terminology series national standards consists of more than 30 parts, all under the general title "Information Technology Vocabulary". This standard is Part 25 of the GB/T5271 terminology series national standards. This standard is proposed by the Ministry of Information Industry of the People's Republic of China. This standard is under the jurisdiction of the China Electronics Technology Standardization Institute. The drafting unit of this standard: China Electronics Technology Standardization Institute. The main drafters of this standard are: Chen Ying, Huang Jiaying, Wang Runsheng, Zhou Shixiong. 344
GB/T5271.25—2000
ISO/IEC Foreword
ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) are specialized standardization organizations worldwide. National member bodies (which are all members of IS() or IEC) participate in the formulation of international standards for specific technical scopes through various technical committees established by international organizations. The technical committees of ISO and IEC cooperate in areas of common interest. Other official and non-official international organizations in contact with ISO and IEC can also participate in the formulation of international standards. For information technology, ISO and IEC have established a joint technical committee, namely ISO/IECJTC1. The draft international standards proposed by the joint technical committee need to be circulated to national member bodies for voting. At least 75% of the national member bodies participating in the voting need to vote in favor of publishing an international standard.
International Standard ISO/IEC2382-25 was developed by the Vocabulary Subcommittee SC1 of the Joint Technical Committee for Information Technology of ISO/IECJTC1.
ISO/IEC2382 consists of more than 30 parts, all under the general title "Information Technology Vocabulary". 3.1.
1 Overview
1.1 Scope
National Standard of the People's Republic of China
Information Technology Vocabulary
Part 25: Local Area Networks
Information technology--VocabularyPart 25:Local area networks
GB/T 5271.25—2000
eqvISO/1EC2382-25:1992
This part of the standard is developed to facilitate international communication in information processing. This standard gives the terms and definitions of concepts related to the field of information processing and clarifies the relationship between these items. To facilitate translation of this standard into other languages, the definitions given avoid language specificity as much as possible. This standard defines various types of local area networks, concepts related to local area network equipment, local area network transmission, and possible problems with these concepts, and also defines various protocols for managing exchanges. 1.2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2659-1994 Codes for names of countries and regions in the world (eqvISO3166:1988) GB/T15237-1994 Basic vocabulary of terminology (eqvISO1087:1990) 1.3 Principles and rules to be followed
1.3.1 Definition of terms
Chapter 2 includes many terms. Each term consists of several required elements, including an index number, a term or several synonyms, and a phrase that defines a concept. In addition, an entry may include examples, notes or explanations to facilitate understanding of the concept. Sometimes the same term may be defined by different entries, or an entry may include two or more concepts, as explained in 1.3.5 and 1.3.8 respectively. This standard uses other terms, such as vocabulary, concepts, terms and definitions, whose meanings are defined in GB/T 15237. 1.3.2 Composition of entries
Each entry includes the required elements specified in 1.3.1, and some additional elements may be added if necessary. The entry includes the following elements in the following order:
a) index number (common to all languages ​​in which this standard is published); b) the preferred term in a term or language. If there is no preferred term for a concept in a language, it is indicated by a five-point symbol (....); in a term, a row of points is used to indicate the selected term in each specific case; c) the preferred term in a country (indicated according to the rules of GB/T 2659); d) the abbreviation of the term;
e ) synonymous terms permitted by the license;
f) the text of the definition (see 1.3.4);
g) one or more examples beginning with "例\"; h) one or more notes beginning with "注" indicating the application field of the concept and special cases; pictures, diagrams or tables shared by the State Administration of Quality and Technical Supervision on July 14, 2000 816
2001-03-01 implementation
adjustment clauses. 1.3.3 Classification of terms
GB/T 5271.25—2000
Each part of this series of standards is assigned a two-digit serial number, starting with 01 for "basic terms". Terms are classified into groups, each of which is assigned a four-digit serial number; the first two digits indicate the part of the series of standards in which the group is located.
Each item is assigned an index number consisting of six digits; the first four digits indicate the standard part and group in which the item is located. In order to make the versions of this series of standards in different languages ​​all related, the serial numbers assigned to the standard parts, groups and items should be the same. 1.3.4 Choice of terms and definitions
The terms and definitions are selected in accordance with established usage as far as possible. In case of contradictions, the method agreed by majority is adopted. 1.3.5 Polysemous terms
If a given term has several meanings in a working language, each meaning is given a separate entry to facilitate translation into other languages.
1.3.6 Abbreviations
Such As indicated in 1.3.2, currently used abbreviations are assigned to some terms. These abbreviations are not used in the text of definitions, examples or annotations.
1.3.7 Use of parentheses
In some terms, a word or several words printed in bold are placed in parentheses. These words are part of the complete term. When the use of abbreviated terms in technical articles does not affect the meaning of the context, these words can be abbreviated. In the main text of definitions, examples or annotations of GB/T5271, these terms are used in full form. In some entries, the term is followed by words in ordinary font placed in brackets. These words are not part of the term, but indicate relevant information about the use of the term, such as its special scope of application, or its grammatical form. 1.3.8 Use of square brackets
If the definitions of several closely related terms differ only by a few words, these terms and their definitions are grouped into one entry. Alternative words to express different meanings are placed in square brackets in the same order as in the term and in the definition. To avoid ambiguity of the replaced word, the last word placed before the brackets according to the above rules may be placed inside square brackets and repeated for each change. 1.3.9 Use of boldface terms and asterisks in definitions When a term is printed in boldface in a definition, example or note, it means that the term has been defined in other entries of this vocabulary. However, the term is printed in boldface only when it first appears in each entry. Boldface is also used for other grammatical forms of a term, such as plural nouns and participle forms of verbs. The basic forms of all terms that appear in boldface in GB/T 5271 are listed in the index at the end of this part (see 1.3.11). When two boldface terms are cited immediately after each other in different entries, they are separated by an asterisk (or only by punctuation).
Words or terms that appear in general font are understood according to the meaning in general dictionaries or authoritative technical vocabulary. 1.3.10 Spelling
In the English version of this series of standards, the spelling of terms, definitions, examples and notes generally follows the American English spelling. Other correct spellings may be used without conflicting with this series of standards. 1.3.11 Compilation of index tables
For each language used, an alphabetical index is provided at the end of each part. The index includes all the terms defined in that part. Multi-word terms appear in alphabetical order after each keyword. 2 Terms and definitions
25 Local area network
25.01 General terms
25.01.01 Local area network GB/T5271.252000
LAN (abbreviation) LAN (abbreviation) ... a computer network located in a user's home within a limited geographical area. Note: Communications within a local area network are not subject to external regulations; however, communications across domain boundaries may be subject to some form of regulations. 25.01.02 baseband LAN A LAN in which data is encoded and transmitted without carrier modulation. 25.01.03 broadband LAN A LAN consisting of more than one channel in which data is encoded, multiplexed and transmitted with carrier modulation.
25.01.04 LAN broadcast LAN broadcast A transmission intended to be received by all other data stations on the same LAN. LAN multicast LANmulticast 25.01.05
A transmission of a frame intended to be received by a selected group of data stations on the same LAN. 25.01.06 token
In a LAN, a specific group of bits used as a token of authority, which is transmitted continuously from one data station to another to indicate that the station has temporary control of the transmission medium. Note: All information is transmitted in frames. Some frames contain a token but no user data, others contain data but no token. Token passing protocol 25.01.07
Token passing procedure A set of rules governing how data stations acquire, use, and pass tokens in a local area network that uses tokens. Carrier sense
In a local area network, a continuous activity by which a data station detects whether another data station is transmitting. Bus network
A local area network in which there is only one path between any two data stations and in which data transmitted by any data station is available to all other data stations connected to the same transmission medium. Note: A bus network may be a linear, star, or tree network. 25.01.10
Repeater
In a local area network, a device that amplifies and regenerates signals to extend the range between data stations or to interconnect two network segments.
Note: See Figure 1.
25.01.11 LAN serverLANserverA data station that provides specific services to other data stations on a LAN. 3.18
GB/T 5271.25—2000
GATEWAY
GATEWAY
LANI, LAN2 and LAN3 are three LANsIAN1 and LAN2 have the same LLC protocol
LAN2 and IAN3 have different LLC protocols
Repeater》
Figure 1 Example of LAN interconnection
Example: file server, print server, mail server. 25.01.12 Bridgebridge
BRIDGE
A functional unit that interconnects two LANs that use the same logical link control protocol but may use different media access control protocols.
Note: See Figure 1.
LAN gateway
LAN gateway
A functional unit that connects a LAN to another network that uses a different protocol. Notes
1 The network can be another LAN, a public data network, or another type of network. 349
2 See Figure 1.
GB/T 5271. 25—2000
LAN individual addressLANindividual address25.01.14
An address that identifies a specific data station on a LAN. 25. 01. 15
LAN group addressLANgroup addressAn address that identifies a group of data stations on a LAN. 6LAN multicast addressLANmulticast address25.01.16
A LAN group address that identifies a subset of data stations on a LAN. 25.01.17
LAN broadcast addressLAN broadcast addressLAN global addressLAN global addressLAN group address that identifies the collection of all data stations on a LAN. 25.01.18
8 Address administrationaddress administrationAssigns LAN* addresses on a local or global basis. 9 local address administrationlocal address administration25. 01. 19
A type of address administration under which all LAN addresses are unique within the same LAN. 25. 01.20
Global address administrationuniversal address administrationglobal address administration-A type of address administration under which all LAN addresses are unique within the same or different LANs.null addressnulladdress
An address that is not associated with any station in a frame. Note: Null addresses can be used for maintenance.
2 Medium access control mediumaccess control 25.01.22
MAC (abbreviation) MAC (abbreviation) A technique used to establish a temporary control of the sequence of data stations on the transmission medium. 3 Trunk cable trunkcable
A cable that connects trunk coupling units to enable communication between data stations. Note: See Figure 2.
25.01.24 Trunk coupling unit
Trunk coupling unit
Trunk connecting unit
TCU (abbreviation) TCU (abbreviation) A physical device that connects a data station to a trunk cable with the help of a branch cable. Note
1 The trunk coupling unit includes a method for inserting the station into the network or bypassing it. 2 See Figure 2.
Data station
Drop cable
DTE: Data Terminal Equipment
MAU: Media Attachment Unit
MIC: Media Interface Connector
TCU: Trunk Coupling Unit
AUI: Attachment Unit Interface
MDI: Media Dependent Interface
Drop cable
drop cable
GB/T 5271. 25-2000
Trunk cable
Figure 2 Interconnection of data stations on trunk cable
Cable connecting a data station to a trunk coupling unit. Note: See Figure 2.
Abort sequence
abort sequence
25.01. 26
Data station
A specific bit pattern occurring anywhere in the bit stream that terminates the transmission of a frame prematurely. MIC (abbreviation) A connector used in a local area network to connect a data station to a trunk coupling unit, trunk cable or branch cable. Note: See Figure 2.
25. 01.28
3 medium attachment unit
medium attachment unit
MAU(abbreviation)MAU(abbreviation)In a data station on a local area network, a device that couples a data terminal equipment to the transmission medium. NOTE: See Figures 2 and 3.
25.01.29 medium dependent interface
medium dependent interface
MDI(abbreviation)
MDI(abbreviation)
In a data station on a local area network, the electromechanical interface between the transmission medium and the medium attachment unit. NOTE: See Figures 2 and 3.
25.01.30 Attachment unit interface AUI (abbreviation)
AUI (abbreviation)
GB/T5271.25—2000
Interface between the media attachment unit and the data terminal equipment in the data station of the local area network. Note: See Figures 2 and 3.
Other layers
Data link layer
Physical layer
LLC: Logical link control
MAC: Media access control
PL.S: Physical signaling
PMA: Physical media attachment
DTE=FTTD: Data terminal equipment
MAU: Media attachment unit
AUI: Attachment unit interface
MDI: Media Dependent Interface||tt ||25.02 Carrier Sense Multiple Access
L.AN: Conceptual Diagram
Other Layers
LLC Sublayer
MAC Sublayer
PLS Sublayer
PMA Sublayer
Transmission Media
Figure 3 Layers and Sublayers of a Local Area Network
LAN. Implementation
Data Station
25.02.01 Carrier Sense Multiple Access with Collision Detection Network
CSMA/CD Network (abbreviation) CSMA/CD network (abbreviation) A bus network in which the media access control protocol requires carrier sensing and anomalies due to collisions are resolved by retransmissions.
Carrier sense multiple access with collision avoidance network25. 02. 02
fcarrier sense multiple access with collision avoidance network
CSMA/CA network(abbreviation)CSMA/CA network(abbreviation)A bus network in which the media access control protocol requires carrier sense and in which a data station on the network always starts transmission by sending a forced interference signal; if there is no collision with a forced interference signal from another station, the station starts sending data; otherwise, it stops transmitting and tries again. 3Contention
25. 02. 03
A condition in a local area network in which two or more data stations are allowed by the media access control protocol to start transmission at the same time, thereby threatening a collision.
25.02.04 collision
A condition resulting from simultaneous transmissions on the transmission medium. 25.02.05 jam signal A signal sent by a data station to inform other data stations that they must not transmit. NOTES
1 In a CSMA/CD network, a jam signal indicates that a collision has occurred. 2 In a CSMA/CA network, a jam signal indicates that the transmitting data station intends to transmit. 25.02.06 collision enforcement In a CSMA/CD network, the transmission of a jam signal by a data station after it has detected a collision to ensure that other data stations are aware of the collision.
25. 02.07 truncated binary exponential backoff In a CSMA/CD network, an algorithm used to schedule retransmissions after a collision, with the retransmissions backed off by an amount of time derived from the slot time and the number of retransmission attempts.
25.02.08 Overtime (transmission) jabber
A transmission by a data station that exceeds the time interval allowed by the protocol. 25.02.09 Overtime control jabber control The ability of a media connection unit in a local area network to automatically interrupt a transmission to prevent an abnormally long outgoing data stream. 25.02.10 Deference
The process by which a data station delays its transmission when the transmission medium is busy to avoid collision with an ongoing transmission. slot time (in a CSMA/CD network) 25. 02. 11 [
An implementation-dependent unit of time used to determine the amount of time delay after which a data station may attempt to retransmit in the event of a collision. 25.02.12
Round-trip propagation time Twice the time required to transmit a bit between the two most distant data stations in a bus network. NOTE: In networks using carrier sense, each relay must be long enough so that the transmitting station can detect collisions or jamming signals while transmitting the relay. The minimum length of a frame is determined by the round-trip propagation time. 25.03
Token-bus
25.03.01 Token-bus networktoken-bus networkA bus network that uses a token-passing protocol. 25.03.02
Headend
In a broadband LAN, a device that receives a signal from each data station and retransmits it to all data stations. NOTE: Retransmission may require a change in carrier frequency. forward LAN channel25.03.03
In a broadband LAN, a channel allocated for data transmission from the headend to the data stations. 25.03.04 backwardLANchannel reverse LAN channel
reverseLANchannel
In a broadband LAN, a channel allocated for data transmission from a data station to a headend. 25.03.05 downlink
modifies or describes data transmission from a headend to a data station 25.03.06 uplink
GB/T 5271.25—2000
modifies or describes data transmission from a data station to a headend. 25.03.07 single-cablebroadband LAN a broadband LAN in which the forward LAN channel and the reverse LAN channel use a single cable. 25.03.08 dual-cablebroadband LAN a broadband LAN in which the forward LAN channel and the reverse LAN channel use separate cables. 25.03.09 logical ring
Abstract representation of a token bus network that passes a token between data stations in a manner that simulates the transfer of control in a ring network.
Note: See Figure 4.
Noise burst signalnoiseburst signalIn a token bus or token ring network, a signal that indicates that there is no valid activity on the transmission medium. 25.03.11 bus-quiet signalbus-quiet signalIn a token bus network, a signal that indicates that the transmission medium is inactive. 25.03.12 control framecontrol frame
A frame that is sent by one layer or sublayer to an entity in the same layer or sublayer of another system, but the frame is not passed to a higher layer or sublayer.
Example: media access control*.
25.03.13 response time windowresponse time windowresponse window
In a token-bus network, a controlled time interval equal to one time slot during which a data station pauses and listens for a response after transmitting a media access control message. www.bzxz.net
25.03.14 transmission path delaytransmission path delayone-way propagation timethe time required to transmit a bit between the two most distant data stations in the bus network. 25.03.15 slot time(in a token-bus network)the maximum time that any data station must wait for a response from another station. 25.04 ring network
25.04.01 token-ring networktoken-ring networkA ring network that allows one-way data transmission between data stations using a token-passing protocol so that the transmitted data returns to the originating station.
25. 04.02 slotted-ring network A ring network that allows unidirectional data transmission between data stations by sending data in predefined time slots in a transmission stream on a transmission medium, with the data returned to the originating station. ring latency
The time required for a signal to propagate once around the ring in a ring network. Note: Ring latency includes the sum of the propagation delay of the signal through the ring medium (including the branch cables), plus the propagation delay through each data station connected to the token ring network. Ring latency is related to the data transmission rate. 25.04.04 star/ring network A unidirectional ring network arranged in a group of data stations interconnected to the network by trunk coupling units.
Note: This configuration allows data stations to be added and removed without disturbing the operation of the network. 5 beaconing station
A data station in a ring network that reports serious faults to its neighboring stations. 354
GB/T 5271.25—-2000
25.04.06 Access control field
access control field
A bit pattern that distinguishes a frame from a token, indicates a data station that can use the token, indicates when a frame should be canceled and allows a station to request the next token.
25.04.07 Padding fil
In a token ring network, a specific bit pattern sent by a transmitting data station before or after a frame, *token, or fault sequence to avoid misinterpretation as inactive or uncertain transmitter status. 25.04.08
Neighbor notificationneighbornotificationIn a token ring network, the process by which each data station identifies the next active station so that all stations affected by a serious fault are aware that a fault has occurred.
25.04.09 Stripping
The act of removing a frame from the network after the originating data station has successfully forwarded its data around the ring. 25.05 Protocols and Architecture
25.05.01 Logical Link Control Protocollogical link control protocolLLC protocol(abbreviation)LLC protocol(abbreviation)In a local area network, a protocol that controls the exchange of frames between data stations, regardless of how the transmission medium is shared. Medium access control protocolmedium access control protocol25. 05. 02
MAC protocol(abbreviation)MAC(abbreviation)In a local area network, a protocol that controls access to the transmission medium based on aspects of the network's topology, enabling data exchange between data stations.
25.05.03 Logical link control sublayerlogical link control sublayerLLC sublayer(abbreviation)LLC sublayer(abbreviation)In a local area network, the part of the data link layer that supports media-independent data link functions. Notes
1The LLC sublayer uses the services of the medium access control sublayer to provide services to the network layer. 2See Figure 3.
25.05.04 Medium access control sublayermediumaccess control sublayerMAC sublayer(abbreviation)MAC sublayer(abbreviation)In a local area network, the part of the data link layer that uses media access control and supports topology-dependent functions. Notes
1The MAC sublayer uses the services of the physical layer to provide services to the logical link control sublayer. 2See Figure 3.
25.05.05 physical signaling sublayer physical signaling sublayer PLS sublayer (abbreviation) PLS sublayer (abbreviation) In a local area network, that part of the physical layer that interfaces with the media access control sublayer to perform bit symbol encoding and transmission, bit symbol reception and decoding, and optional isolation functions. Note: See Figure 3.
25.05.06 physical medium attachment sublayer physical medium attachment sublayer PMA sublayer (abbreviation) PMA sublayer (abbreviation) In a local area network, that part of the physical layer implemented by the functional circuits of the media attachment unit. Note: See Figure 3.
logical link control type 1 logical link control type 125.05.07
LLC type 1 (abbreviation) LLC type 1 (abbreviation) An unacknowledged connectionless transmission within the logical link control sublayer. 25.05.08 logical link control type 2 logical link control type 23.5507 fillfil
In a token ring network, a specific bit pattern sent by a sending data station before or after a frame, *token, or fault sequence to avoid misinterpretation as inactive or indeterminate transmitter status. 25.04.08
neighbor notificationneighbor notificationIn a token ring network, the process by which each data station identifies the next active station so that all stations affected by a serious fault are aware that a fault has occurred.
25.04.09 stripping
The act of removing a frame from the network after the originating data station has successfully forwarded its data around the ring. 25.05 Protocols and Architecture
25.05.01 Logical Link Control Protocollogical Link Control Protocol LLC protocol(abbreviation) In a local area network, the protocol that controls the exchange of frames between data stations, regardless of how the transmission medium is shared. medium access control protocol25. 05. 02
MAC protocol (abbreviation)MAC (abbreviation)In a local area network, a protocol that controls access to the transmission medium based on aspects of the network's topology, enabling data exchange between data stations.
25.05.03Logical link control sublayerlogical link control sublayerLLC sublayer (abbreviation)LLC sublayer (abbreviation)In a local area network, that part of the data link layer that supports media-independent data link functions. Notes
1The LLC sublayer uses the services of the medium access control sublayer to provide services to the network layer. 2See Figure 3.
25.05.04Medium access control sublayerMAC sublayer (abbreviation)MAC sublayer (abbreviation)In a local area network, that part of the data link layer that uses medium access control and supports topology-dependent functions. Notes
1 The MAC sublayer uses the services of the physical layer to provide services to the logical link control sublayer. 2 See Figure 3.
25.05.05 Physical signaling sublayer physical signaling sublayer PLS sublayer (abbreviation) PLS sublayer (abbreviation) In a local area network, the part of the physical layer that interfaces with the medium access control sublayer to perform bit symbol encoding and transmission, bit symbol reception and decoding, and optional isolation functions. Note: See Figure 3.
25.05.06 Physical medium attachment sublayer physical medium attachment sublayer PMA sublayer (abbreviation) PMA sublayer (abbreviation) In a local area network, the part of the physical layer implemented by the functional circuits of the media attachment unit. Note: See Figure 3.
Logical link control type 1 logical link control type 1 25.05.07
LLC type 1 (abbreviation) LLC type 1 (abbreviation) An unconfirmed connectionless transmission within the logical link control sublayer. 25.05.08 Logical link control type 2 logical link control type 23.5507 fillfil
In a token ring network, a specific bit pattern sent by a sending data station before or after a frame, *token, or fault sequence to avoid misinterpretation as inactive or indeterminate transmitter status. 25.04.08
neighbor notificationneighbor notificationIn a token ring network, the process by which each data station identifies the next active station so that all stations affected by a serious fault are aware that a fault has occurred.
25.04.09 stripping
The act of removing a frame from the network after the originating data station has successfully forwarded its data around the ring. 25.05 Protocols and Architecture
25.05.01 Logical Link Control Protocollogical Link Control Protocol LLC protocol(abbreviation) In a local area network, the protocol that controls the exchange of frames between data stations, regardless of how the transmission medium is shared. medium access control protocol25. 05. 02
MAC protocol (abbreviation)MAC (abbreviation)In a local area network, a protocol that controls access to the transmission medium based on aspects of the network's topology, enabling data exchange between data stations.
25.05.03Logical link control sublayerlogical link control sublayerLLC sublayer (abbreviation)LLC sublayer (abbreviation)In a local area network, that part of the data link layer that supports media-independent data link functions. Notes
1The LLC sublayer uses the services of the medium access control sublayer to provide services to the network layer. 2See Figure 3.
25.05.04Medium access control sublayerMAC sublayer (abbreviation)MAC sublayer (abbreviation)In a local area network, that part of the data link layer that uses medium access control and supports topology-dependent functions. Notes
1 The MAC sublayer uses the services of the physical layer to provide services to the logical link control sublayer. 2 See Figure 3.
25.05.05 Physical signaling sublayer physical signaling sublayer PLS sublayer (abbreviation) PLS sublayer (abbreviation) In a local area network, the part of the physical layer that interfaces with the medium access control sublayer to perform bit symbol encoding and transmission, bit symbol reception and decoding, and optional isolation functions. Note: See Figure 3.
25.05.06 Physical medium attachment sublayer physical medium attachment sublayer PMA sublayer (abbreviation) PMA sublayer (abbreviation) In a local area network, the part of the physical layer implemented by the functional circuits of the media attachment unit. Note: See Figure 3.
Logical link control type 1 logical link control type 1 25.05.07
LLC type 1 (abbreviation) LLC type 1 (abbreviation) An unconfirmed connectionless transmission within the logical link control sublayer. 25.05.08 Logical link control type 2 logical link control type 23.55
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