Microsoft Word 1334 4 33f d– NORME INTERNATIONALE CEI IEC INTERNATIONAL STANDARD 61334 4 33 Première édition First edition 1998 07 Automatisation de la distribution à l’aide de systèmes de communicati[.]
Domaine et objet
This section of IEC 61334 addresses the services required by or for the logical link control (LLC) sublayer of the data communication protocol (DCP) It focuses on the logical interfaces between the LLC user layer and the MAC sublayer, utilizing LLC procedures in connection-oriented mode.
The services are defined to illustrate the flow of information between the LLC user and the MAC services, detailing the service primitives and parameters that characterize each service These service primitives are specified in IEC 61334-4-32 and this standard, with only specific details and modifications for connection-oriented procedures presented.
The primitives in this standard are linked to the LLC protocol in connection-oriented (CO) mode, offering connectionless services Additionally, a data transfer mode outside the connection context is provided and aligned with CO procedures.
The method for establishing, closing, and monitoring the connection status is provided to the LLC sub-layer management entity through service primitives, which are not accessible via the LLC user interface.
Acronymes et définitions
Pour les besoins de la présente partie de la CEI 61334, les acronymes et définitions de la
CEI 61334-4-32 s’appliquent, ainsi que les suivants:
CO Mode orienté connexion (connection oriented) du protocole LLC.
HDLC Procédures de contrôle de liaison de données de haut niveau (high level data link).
Lcls Paramètre de classe de liaison (link class parameter) dans les primitives de service
NRM Mode de réponse normal (normal response mode), un des modes de liaison de données opérationnels des HDLC.
TW A Deux voies alternées (two way alternate), un cas particulier de NRM.
NDM Mode de déconnexion normal (normal disconnect mode), un des modes non opérationnels de liaison de données de HDLC.
Cet article spécifie les services exigés de la sous-couche LLC par ses utilisateurs pour échanger des paquets avec une entité homologue éloignée en utilisant les opérations DCP
LLC-CO dans la sous-couche LLC Les services sont dộcrits de faỗon abstraite.
Description des interactions
Services de base
Le paragraphe 2.1.1 de la CEI 61334-4-32 s’applique, avec l’addition suivante:
Ces services sont les seuls mis à la disposition de l’utilisateur LLC; en fonction des types de
PDU de LLC, type 1 ou type 2, les champs SSAP et DSAP seront ou non présents à l’interface de service.
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
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For the purpose of this part of IEC 61334, the acronyms and definitions of IEC 61334-4-32 along with the following apply.
CO Connection-oriented mode of LLC protocol.
HDLC High-level data link control procedures.
Lcls Link class parameter in LLC service primitives.
NRM Normal response mode, one of the operational data link mode of the HDLC.
TWA Two-way alternate, a special case of NRM.
NDM Normal disconnect mode, one of the non-operational data link mode of the HDLC.
This clause outlines the services needed by the user at the logical link control sublayer to facilitate packet exchange with remote peer entities through DCP LLC-CO operations The description of these services is presented in an abstract manner.
Subclause 2.1.1 of IEC 61334-4-32 applies with the following addition.
The LLC user service interface offers specific services, which vary based on the type of LLC PDU—either type 1 or type 2 Depending on this classification, the presence of the SSAP and DSAP fields will differ.
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
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LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind DL_Data.ind
DL_Data.ind MA_Data.ind
Services non sollicités
The LLC-CO procedure does not provide any unsolicited services (refer to section 2.1.2 of IEC 61334-4-32) Unsolicited responses from peripheral stations can be gathered through an appropriate polling policy that utilizes the LLC-CO protocol procedures.
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LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind DL_Data.ind
DL_Data.ind MA_Data.ind
The LLC-CO procedure does not offer any of the unsolicited services specified in section 2.1.2 of IEC 61334-4-32 However, unsolicited responses from peripheral stations can be gathered by implementing a suitable polling policy that utilizes the LLC-CO protocol procedures.
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LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind RR-Frame
MA_Data.ind MA_Data.req
MA_Data.con MA_Data.ind
MA_Data.req MA_Data.con
MA_Data.ind MA_Data.req
DL_Data.con DL_Data.req
Figure 4 – Réponse non sollicitée avec confirmation
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind RR-Frame
DL_Data.con DL_Data.req
Figure 5 – Réponse non sollicitée sans confirmation
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LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind RR-Frame
MA_Data.ind MA_Data.req
MA_Data.con MA_Data.ind
MA_Data.req MA_Data.con
MA_Data.ind MA_Data.req
DL_Data.con DL_Data.req
Figure 4 – Unsolicited response with confirm
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind RR-Frame
DL_Data.con DL_Data.req
Figure 5 – Unsolicited response without confirm
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Services de gestion
Les services suivants sont fournis à des fins de gestion:
– DL_Open.request (demande d’ouverture), DL_Open.confirm (confirmation d’ouverture);
– DL_Connect.request (demande de connexion), DL_Connect.confirm (confirmation de connexion);
– DL_Disconnect.request (demande de déconnexion), DL_Diconnect.confirm (confirmation de déconnexion), DL_Disconnect.indication (indication de déconnexion);
– DL_Close.request (demande de fermeture), DL_Close.confirm (confirmation de fermeture);
– DL_Test.request (demande d’essai), DL_Test.confirm (confirmation d’essai).
Ces services permettent à l’entité de gestion de la sous-couche LLC de définir et de fermer le statut de connexion entre deux entités LLC homologues.
It is important to note that management primitives are not visible through the LLC user interface If there is an incorrect login status, the LLC user will receive a notification.
DL_Data.confirm (confirmation des données) avec le statut approprié de transmission non réussie.
La faỗon dont l’entitộ de gestion dộcide de commander à la sous-couche LLC d’ộtablir ou de fermer une connexion est hors du domaine d’application de la présente spécification.
DL_Data.request
Fonction
Le paragraphe 2.2.1 de la CEI 61334-4-32 s’applique.
Structure
Le paragraphe 2.2.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant le
Lcls (paramètre de classe de liaison).
Le paramètre LCLS implique l’usage de:
– la procédure UI (voir 2.4.2) s’il est de la classe UI_CLASS (valeur affectée égale à 1);
– la procédure I, (voir 2.4.2) s’il est de la classe I_CLASS (valeur affectée égale à 2).
Application
This primitive is generated by the user entity of the LLC sublayer whenever data needs to be transmitted to a corresponding user entity of the LLC sublayer If the value of Lcls is I_CLASS, only individual station addresses are accepted.
Upon receiving this primitive, the LLC sublayer entity adds all specific LLC fields and forwards the appropriately formatted L_pdu (Logical Protocol Data Unit) to the lower protocol layers for transfer to the corresponding LLC sublayer entity.
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The following services are provided for management purposes:
– DL_Open.request, DL_Open.confirm;
– DL_Connect.request, DL_Connect.confirm;
– DL_Disconnect.request,DL_Disconnect.confirm, DL_Disconnect.indication;
– DL_Close.request, DL_Close.confirm;
– DL_Test.request, DL_Test.confirm.
These services allow the LLC sublayer management entity to set up and close down the connection status between peers of LLC entities.
The management primitives are not accessible via the LLC user interface If there is an incorrect connection status, the LLC user will receive a DL_Data.confirm message indicating an unsuccessful transmission status.
The way the management entity decides to command the LLC sublayer to set up and close down connections is beyond the scope of this specification.
Subclause 2.2.2 of IEC 61334-4-32 applies with the following addition about the link class parameter (Lcls).
The Lcls parameter will invoke the use of:
– the UI procedure (see 2.4.2) if it is set to UI_CLASS (assigned value equal to 1);
– the I procedures (see 2.4.2) if it is set to I_CLASS (assigned value equal to 2).
The LLC user layer entity generates this primitive to facilitate data transmission to a peer LLC user layer entity, accepting only individual station addresses when the Lcls value is met.
The receipt of this primitive will cause the LLC sublayer entity to append all LLC specific fields
(given below) and pass the properly formed L_pdu with data field to the lower layers of protocol for transfer to the peer LLC sublayer entity.
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DL_Data.confirm
Fonction
Le paragraphe 2.3.1 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant l’importance de la primitive:
Cette primitive n’a qu’une importance locale et fournit une réponse appropriée à l’entité utilisateur de la sous-couche LLC-CO (couche réseau) qui a initialisé une primitive
DL_Data.request et désirant recevoir un accusé de réception de l’entité homologue LLC éloignée dans le cas d’un DL_Data.request avec une valeur du Lcls égale à I_CLASS.
Structure
Le paragraphe 2.3.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant les valeurs de Transmission_Status (statut de la transmission):
Les valeurs de Transmission_Status incluent celles qui indiquent les transmissions ayant échoué à cause d’une inconsistance du statut de la connexion entre les entités homologues
LLC, ainsi que l'échec de la transmission après le nombre prévu de répétitions.
Application
Le paragraphe 2.3.3 de la CEI 61334-4-32 s’applique, avec l’addition suivante:
This primitive is generated in response to a DL_Data.request directed to the local user entity of the LLC sublayer, pertaining to an incoming acknowledgment related to the relevant L_pdu information.
It is important to note that the acknowledgment of receipt is based on a per-station basis, and the generation of confirmation does not entail the actual provision of an L_sdu to the user entity.
DL_Data.indication
Fonction
Le paragraphe 2.4.1 de la CEI 61334-4-32 s’applique.
Structure
Le paragraphe 2.4.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant les valeurs du paramètre Lcls.
The Lcls parameter (link class) indicates that the incoming L_sdu is included in a UI frame if its value is UI_CLASS, and in an I frame if its value is I_CLASS.
Application
Le paragraphe 2.4.3 de la CEI 61334-4-32 s’applique.
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Subclause 2.3.1 of IEC 61334-4-32 applies with the following addition about the primitive significance.
The primitive holds local significance and effectively responds to the LLC-CO user layer entity at the network layer that initiated a DL_Data.request primitive, indicating the receipt of the LLC acknowledgment from the remote LLC peer entity.
DL_Data.request Lcls value equal to I_CLASS.
Subclause 2.3.2 of IEC 61334-4-32 applies, with the following addition about the
Transmission_Status values include those which indicate unsuccessful transmission because of inconsistency in connection status between the LLC peer entities and transmission failed after the requested number of retries.
Subclause 2.3.3 of IEC 61334-4-32 applies with the following addition.
This primitive is generated in response to a DL_Data.request primitive back to the local LLC
User Layer entity, on an incoming acknowledgement of the related Information L_pdu.
Acknowledgement occurs on a per station basis, and the generation of confirmation does not guarantee the actual delivery of L_sdu to the remote LLC user entity.
Subclause 2.4.2 of IEC 61334-4-32 applies with the following addition about the Lcls parameter values.
The Lcls (Link class) parameter determines the inclusion of the incoming L_sdu in a UI frame when set to UI_CLASS, or in an I frame when set to I_CLASS.
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DL_Open.request
Fonction
The DL_Open.request primitive is sent from the management entity of the LLC sublayer to the LLC entity to request resource allocation for a connection with another entity.
Structure
La sémantique de la primitive est la suivante:
DL_Open.request ( Destination_address,
Source_address, Tx_window, Rx_window, U_retry, S_retry, I_retry, Aut_msg )
Les paramètres Destination_address (adresse destinataire) et Source_address (adresse émetteur) spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion.
The Tx_window (transit window) and Rx_window (reception window) parameters define the values for the transit and reception windows in a connection.
Les paramètres U_retry, S_retry et I_retry indiquent le nombre maximal de répétitions permises par les procédures de la sous-couche LLC pour les trames non numérotées
(U_retry), les trames de supervision (S_retry) et les trames d’information (I_retry).
Le paramètre Aut_msg, s’il a une valeur différente de zéro, indique la possibilité de générer ou de recevoir des messages non sollicités.
Application
The DL_Open.request primitive is sent from the LLC management entity to the LLC sublayer entity to request the allocation of resources needed for a connection with the appropriate windowing parameters.
Le couple de paramốtres Destination_address et Source_address identifie de faỗon univoque la connexion: la Destination_address peut être une adresse de groupe.
L’entité de la sous-couche LLC n’accepte pas d’autres primitives demande avec les mêmes paramètres d’adresse avant la DL_Open.request appropriée.
DL_Open.confirm
Fonction
La primitive DL_Open.confirm est transmise de l’entité de la sous-couche LLC à l’entité de gestion de la sous-couche LLC pour confirmer la DL_Open.request.
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The DL_Open.request is passed from the LLC sublayer management entity to the LLC entity to request the allocation of resources for a connection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Open.request ( Destination_address,
Source_address, Tx_window, Rx_window, U_retry, S_retry, I_retry, Aut_msg )
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection.
The Tx_window and Rx_window parameters indicate the transmit and receive windowing values for the connection.
U_retry, S_retry and I_retry indicate the maximum number of retries which should be used by
LLC sublayer procedures for unnumbered frames (U_retry), supervisory frames (S_retry) and information frames (I_retry).
The Aut_msg parameter, if set to values different from zero, indicates the possibility to generate/receive unsolicited messages.
The DL_Open.request is sent from the LLC management entity to the LLC sublayer entity to allocate the necessary resources for establishing a connection with the correct windowing parameters.
The couple of Destination_address and Source_address parameters univocally identifies the connection: the Destination_address may be a group address.
No other request primitives with the same address parameters are accepted by the LLC sublayer entity before the appropriate DL_Open.request.
The DL_Open.confirm is passed from the LLC sublayer entity to the LLC management entity to confirm a DL_Open.request.
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Structure
La sémantique de la primitive est la suivante:
DL_Open.confirm ( Destination_address,
The parameters Destination_address and Source_address define the addresses of the local station and the remote stations involved in the connection The Destination_address can represent either a single address or a group address.
Le paramètre Status indique une ouverture réussie si la valeur est zéro, un échec dans tout autre cas.
Application
The DL_Open.confirm primitive is sent from the LLC sublayer entity to the LLC management entity to provide the outcome of the prior DL_Open.request, assuming that sufficient information is available at the management entity.
LLC pour associer la réponse à la demande appropriée.
DL_Connect.request
Fonction
La primitive DL_Connect.request est transmise de l’entité de gestion de la sous-couche LLC à l’entité LLC pour demander une connexion avec une entité LLC éloignée.
Structure
La sémantique de la primitive est la suivante:
DL_Connect.request ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Application
The DL_Connect.request primitive is sent from the LLC management entity to the LLC sub-layer entity to establish a connection using the resources allocated by a prior successful DL_Open.request.
La primitive DL_Connect.request est invoquée lorsqu’il est recommandé que l’utilisation des primitives DL_Data.request/indication soit autorisée avec Lcls égal à I_CLASS.
DL_Connect.confirm
Fonction
La primitive DL_Connect.confirm est transmise de la sous-couche LLC à l’entité de gestion
LLC pour confirmer une DL_Connect.request.
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The semantics of the primitive are as follows:
DL_Open.confirm ( Destination_address,
The Destination_address and Source_address parameters define the addresses of the local and remote stations in a connection, with the Destination_address potentially being either an individual or a group address.
The Status parameter indicates a successful open in case of zero value, unsuccessful otherwise.
The DL_Open.confirm message is sent from the LLC sublayer entity to the LLC management entity, signaling the outcome of a prior DL_Open.request It is expected that the LLC sublayer management entity has enough information to link the response to the corresponding request.
The DL_Connect.request is passed from the LLC sublayer management entity to the LLC entity to request for a connection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Connect.request ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The DL_Connect.request is transmitted from the LLC management entity to the LLC sublayer entity to initiate the establishment of a connection, utilizing resources that were previously allocated during a successful operation.
The DL_Connect.request is invoked when the use of DL_Data.request/indication primitives should be allowed with Lcls equal to I_CLASS.
The DL_Connect.confirm is passed from the LLC sublayer to the LLC management entity to confirm a DL_Connect.request.
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Structure
La sémantique de la primitive est la suivante:
DL_Connect.confirm ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Le paramètre Status indique une mise en place de la connexion réussie si la valeur est zéro, un échec dans tout autre cas.
Scope and object
This part of IEC 61334 covers the services required of, or by, the data communication protocol
(DCP) logical link control (LLC) sublayer entity at the logical interfaces with the LLC-user layer and the MAC sublayer, using the connection-oriented LLC procedures.
The article outlines the information flow between LLC users and MAC services by detailing the service primitives and parameters that define each service These service primitives are specified in IEC 61334-4-32, which provides specific details and modifications related to connection-oriented procedures.
The primitives in this standard are linked to the connection-oriented (CO) LLC protocol, which offers connectionless services Additionally, it includes a data transfer mode that operates independently of the connection context, ensuring compatibility with CO procedures.
The setup, closure, and monitoring of connection status are facilitated by service primitives directed to the LLC sublayer management entity, which are not accessible through the LLC user interface.
Normative references
This section of IEC 61334 references several normative documents that are integral to its provisions At the time of publication, the listed editions were current; however, all normative documents may be revised Therefore, parties involved in agreements related to this part of IEC 61334 should consider using the latest editions of the referenced documents Additionally, IEC and ISO members keep updated registers of valid International Standards.
IEC 61334-4-32:1996, Distribution automation using distribution line carrier systems – Part 4:
Data communication protocols – Section 32: Data link layer – Logical link control (LLC)
ISO/IEC 4335:1993, Information technology – Telecommunications and information exchange between systems – High-level data link control (HDLC) procedures – Elements of procedures
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Pour les besoins de la présente partie de la CEI 61334, les acronymes et définitions de la
CEI 61334-4-32 s’appliquent, ainsi que les suivants:
CO Mode orienté connexion (connection oriented) du protocole LLC.
HDLC Procédures de contrôle de liaison de données de haut niveau (high level data link).
Lcls Paramètre de classe de liaison (link class parameter) dans les primitives de service
NRM Mode de réponse normal (normal response mode), un des modes de liaison de données opérationnels des HDLC.
TW A Deux voies alternées (two way alternate), un cas particulier de NRM.
NDM Mode de déconnexion normal (normal disconnect mode), un des modes non opérationnels de liaison de données de HDLC.
Cet article spécifie les services exigés de la sous-couche LLC par ses utilisateurs pour échanger des paquets avec une entité homologue éloignée en utilisant les opérations DCP
LLC-CO dans la sous-couche LLC Les services sont dộcrits de faỗon abstraite.
Le paragraphe 2.1.1 de la CEI 61334-4-32 s’applique, avec l’addition suivante:
Ces services sont les seuls mis à la disposition de l’utilisateur LLC; en fonction des types de
PDU de LLC, type 1 ou type 2, les champs SSAP et DSAP seront ou non présents à l’interface de service.
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
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Acronyms and definitions
For the purpose of this part of IEC 61334, the acronyms and definitions of IEC 61334-4-32 along with the following apply.
CO Connection-oriented mode of LLC protocol.
HDLC High-level data link control procedures.
Lcls Link class parameter in LLC service primitives.
NRM Normal response mode, one of the operational data link mode of the HDLC.
TWA Two-way alternate, a special case of NRM.
NDM Normal disconnect mode, one of the non-operational data link mode of the HDLC.
This clause outlines the services needed by the user at the logical link control sublayer to facilitate packet exchange with remote peer entities through DCP LLC-CO operations The description of these services is presented in an abstract manner.
Overview of interactions
Basic services
Subclause 2.1.1 of IEC 61334-4-32 applies with the following addition.
The LLC user service interface offers specific services, which vary based on the type of LLC Protocol Data Unit (PDU), either type 1 or type 2 Depending on the PDU type, the fields Source Service Access Point (SSAP) and Destination Service Access Point (DSAP) may or may not be included.
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
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LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind DL_Data.ind
DL_Data.ind MA_Data.ind
The LLC-CO procedure does not provide any unsolicited services (refer to section 2.1.2 of IEC 61334-4-32) Unsolicited responses from peripheral stations can be gathered through an appropriate polling policy that utilizes the LLC-CO protocol procedures.
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LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind DL_Data.ind
DL_Data.ind MA_Data.ind
Unsolicited services
The LLC-CO procedure does not offer any of the unsolicited services specified in section 2.1.2 of IEC 61334-4-32 However, unsolicited responses from peripheral stations can be gathered through a suitable polling policy utilizing the LLC-CO protocol procedures.
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LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind RR-Frame
MA_Data.ind MA_Data.req
MA_Data.con MA_Data.ind
MA_Data.req MA_Data.con
MA_Data.ind MA_Data.req
DL_Data.con DL_Data.req
Figure 4 – Réponse non sollicitée avec confirmation
LLC-CO utilisateur LLC-CO MAC MAC LLC-CO LLC-CO utilisateur
MA_Data.ind RR-Frame
DL_Data.con DL_Data.req
Figure 5 – Réponse non sollicitée sans confirmation
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LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind RR-Frame
MA_Data.ind MA_Data.req
MA_Data.con MA_Data.ind
MA_Data.req MA_Data.con
MA_Data.ind MA_Data.req
DL_Data.con DL_Data.req
Figure 4 – Unsolicited response with confirm
LLC-CO user LLC-CO MAC MAC LLC-CO LLC-CO user
MA_Data.ind RR-Frame
DL_Data.con DL_Data.req
Figure 5 – Unsolicited response without confirm
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Les services suivants sont fournis à des fins de gestion:
– DL_Open.request (demande d’ouverture), DL_Open.confirm (confirmation d’ouverture);
– DL_Connect.request (demande de connexion), DL_Connect.confirm (confirmation de connexion);
– DL_Disconnect.request (demande de déconnexion), DL_Diconnect.confirm (confirmation de déconnexion), DL_Disconnect.indication (indication de déconnexion);
– DL_Close.request (demande de fermeture), DL_Close.confirm (confirmation de fermeture);
– DL_Test.request (demande d’essai), DL_Test.confirm (confirmation d’essai).
Ces services permettent à l’entité de gestion de la sous-couche LLC de définir et de fermer le statut de connexion entre deux entités LLC homologues.
It is important to note that management primitives are not visible through the LLC user interface, and if the connection status is incorrect, the LLC user will receive a notification.
DL_Data.confirm (confirmation des données) avec le statut approprié de transmission non réussie.
La faỗon dont l’entitộ de gestion dộcide de commander à la sous-couche LLC d’ộtablir ou de fermer une connexion est hors du domaine d’application de la présente spécification.
Le paragraphe 2.2.1 de la CEI 61334-4-32 s’applique.
Le paragraphe 2.2.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant le
Lcls (paramètre de classe de liaison).
Le paramètre LCLS implique l’usage de:
– la procédure UI (voir 2.4.2) s’il est de la classe UI_CLASS (valeur affectée égale à 1);
– la procédure I, (voir 2.4.2) s’il est de la classe I_CLASS (valeur affectée égale à 2).
This primitive is generated by the user entity of the LLC sublayer whenever data needs to be transmitted to a corresponding user entity of the LLC sublayer If the value of Lcls is I_CLASS, only individual station addresses are accepted.
Upon receiving this primitive, the LLC sublayer entity adds all specific LLC fields and forwards the appropriately formatted L_pdu (Logical Link Control Protocol Data Unit) to the lower protocol layers for transfer to the corresponding LLC sublayer entity.
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Management services
The following services are provided for management purposes:
– DL_Open.request, DL_Open.confirm;
– DL_Connect.request, DL_Connect.confirm;
– DL_Disconnect.request,DL_Disconnect.confirm, DL_Disconnect.indication;
– DL_Close.request, DL_Close.confirm;
– DL_Test.request, DL_Test.confirm.
These services allow the LLC sublayer management entity to set up and close down the connection status between peers of LLC entities.
The management primitives are not displayed in the LLC user interface If there is an incorrect connection status, the LLC user will receive a DL_Data.confirm message indicating an unsuccessful transmission status.
The way the management entity decides to command the LLC sublayer to set up and close down connections is beyond the scope of this specification.
Function
Subclause 2.2.2 of IEC 61334-4-32 applies with the following addition about the link class parameter (Lcls).
The Lcls parameter will invoke the use of:
– the UI procedure (see 2.4.2) if it is set to UI_CLASS (assigned value equal to 1);
– the I procedures (see 2.4.2) if it is set to I_CLASS (assigned value equal to 2).
Use
The LLC user layer entity generates this primitive to facilitate data transmission to a peer entity, accepting only individual station addresses when the Lcls value is met.
The receipt of this primitive will cause the LLC sublayer entity to append all LLC specific fields
(given below) and pass the properly formed L_pdu with data field to the lower layers of protocol for transfer to the peer LLC sublayer entity.
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Le paragraphe 2.3.1 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant l’importance de la primitive:
Cette primitive n’a qu’une importance locale et fournit une réponse appropriée à l’entité utilisateur de la sous-couche LLC-CO (couche réseau) qui a initialisé une primitive
DL_Data.request et désirant recevoir un accusé de réception de l’entité homologue LLC éloignée dans le cas d’un DL_Data.request avec une valeur du Lcls égale à I_CLASS.
Le paragraphe 2.3.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant les valeurs de Transmission_Status (statut de la transmission):
Les valeurs de Transmission_Status incluent celles qui indiquent les transmissions ayant échoué à cause d’une inconsistance du statut de la connexion entre les entités homologues
LLC, ainsi que l'échec de la transmission après le nombre prévu de répétitions.
Le paragraphe 2.3.3 de la CEI 61334-4-32 s’applique, avec l’addition suivante:
This primitive is generated in response to a DL_Data.request directed to the local user entity of the LLC sublayer, pertaining to an incoming acknowledgment related to the relevant L_pdu information.
It is important to note that the acknowledgment of receipt is based on a per-station basis, and the generation of confirmation does not entail the actual provision of an L_sdu to the user entity.
Le paragraphe 2.4.1 de la CEI 61334-4-32 s’applique.
Le paragraphe 2.4.2 de la CEI 61334-4-32 s’applique, avec l’addition suivante concernant les valeurs du paramètre Lcls.
The Lcls parameter (link class) indicates that the incoming L_sdu is included in a UI frame if its value is UI_CLASS, and in an I frame if its value is I_CLASS.
Le paragraphe 2.4.3 de la CEI 61334-4-32 s’applique.
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Function
Subclause 2.3.1 of IEC 61334-4-32 applies with the following addition about the primitive significance.
The primitive holds local significance and effectively responds to the LLC-CO user layer entity at the network layer that initiated a DL_Data.request primitive, indicating the receipt of the LLC acknowledgment from the remote LLC peer entity.
DL_Data.request Lcls value equal to I_CLASS.
Subclause 2.3.2 of IEC 61334-4-32 applies, with the following addition about the
Transmission_Status values include those which indicate unsuccessful transmission because of inconsistency in connection status between the LLC peer entities and transmission failed after the requested number of retries.
Use
Subclause 2.3.3 of IEC 61334-4-32 applies with the following addition.
This primitive is generated in response to a DL_Data.request primitive back to the local LLC
User Layer entity, on an incoming acknowledgement of the related Information L_pdu.
Acknowledgement occurs on a per station basis, and the generation of confirmation does not guarantee the actual delivery of L_sdu to the remote LLC user entity.
Function
Subclause 2.4.2 of IEC 61334-4-32 applies with the following addition about the Lcls parameter values.
The Lcls (Link class) parameter determines the inclusion of the incoming L_sdu in a UI frame when set to UI_CLASS, or in an I frame when set to I_CLASS.
Use
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The DL_Open.request primitive is sent from the LLC management entity to the LLC entity to request resource allocation for a connection with another entity.
La sémantique de la primitive est la suivante:
DL_Open.request ( Destination_address,
Source_address, Tx_window, Rx_window, U_retry, S_retry, I_retry, Aut_msg )
Les paramètres Destination_address (adresse destinataire) et Source_address (adresse émetteur) spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion.
The Tx_window (transit window) and Rx_window (reception window) parameters define the values for the transit and reception windows in a connection.
Les paramètres U_retry, S_retry et I_retry indiquent le nombre maximal de répétitions permises par les procédures de la sous-couche LLC pour les trames non numérotées
(U_retry), les trames de supervision (S_retry) et les trames d’information (I_retry).
Le paramètre Aut_msg, s’il a une valeur différente de zéro, indique la possibilité de générer ou de recevoir des messages non sollicités.
The DL_Open.request primitive is sent from the LLC management entity to the LLC sublayer entity to request the allocation of resources needed for a connection with the appropriate windowing parameters.
Le couple de paramốtres Destination_address et Source_address identifie de faỗon univoque la connexion: la Destination_address peut être une adresse de groupe.
L’entité de la sous-couche LLC n’accepte pas d’autres primitives demande avec les mêmes paramètres d’adresse avant la DL_Open.request appropriée.
La primitive DL_Open.confirm est transmise de l’entité de la sous-couche LLC à l’entité de gestion de la sous-couche LLC pour confirmer la DL_Open.request.
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Function
The DL_Open.request is passed from the LLC sublayer management entity to the LLC entity to request the allocation of resources for a connection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Open.request ( Destination_address,
Source_address, Tx_window, Rx_window, U_retry, S_retry, I_retry, Aut_msg )
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection.
The Tx_window and Rx_window parameters indicate the transmit and receive windowing values for the connection.
U_retry, S_retry and I_retry indicate the maximum number of retries which should be used by
LLC sublayer procedures for unnumbered frames (U_retry), supervisory frames (S_retry) and information frames (I_retry).
The Aut_msg parameter, if set to values different from zero, indicates the possibility to generate/receive unsolicited messages.
Use
The DL_Open.request is sent from the LLC management entity to the LLC sublayer entity to request the necessary resource allocation for establishing a connection with the correct windowing parameters.
The couple of Destination_address and Source_address parameters univocally identifies the connection: the Destination_address may be a group address.
No other request primitives with the same address parameters are accepted by the LLC sublayer entity before the appropriate DL_Open.request.
Function
The DL_Open.confirm is passed from the LLC sublayer entity to the LLC management entity to confirm a DL_Open.request.
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La sémantique de la primitive est la suivante:
DL_Open.confirm ( Destination_address,
The parameters Destination_address and Source_address define the addresses of the local station and the remote stations involved in the connection The Destination_address can represent either an individual address or a group address.
Le paramètre Status indique une ouverture réussie si la valeur est zéro, un échec dans tout autre cas.
The DL_Open.confirm primitive is transmitted from the LLC sublayer entity to the LLC management entity to provide the outcome of the prior DL_Open.request, assuming that sufficient information is available at the LLC management entity.
LLC pour associer la réponse à la demande appropriée.
La primitive DL_Connect.request est transmise de l’entité de gestion de la sous-couche LLC à l’entité LLC pour demander une connexion avec une entité LLC éloignée.
La sémantique de la primitive est la suivante:
DL_Connect.request ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
The DL_Connect.request primitive is sent from the LLC management entity to the LLC sub-layer entity to establish a connection using resources allocated by a prior successful DL_Open.request.
La primitive DL_Connect.request est invoquée lorsqu’il est recommandé que l’utilisation des primitives DL_Data.request/indication soit autorisée avec Lcls égal à I_CLASS.
La primitive DL_Connect.confirm est transmise de la sous-couche LLC à l’entité de gestion
LLC pour confirmer une DL_Connect.request.
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The semantics of the primitive are as follows:
DL_Open.confirm ( Destination_address,
The Destination_address and Source_address parameters define the addresses of the local and remote stations in a connection, with the Destination_address capable of being either an individual or a group address.
The Status parameter indicates a successful open in case of zero value, unsuccessful otherwise.
Use
The DL_Open.confirm message is sent from the LLC sublayer entity to the LLC management entity, signaling the outcome of a prior DL_Open.request It is expected that the LLC sublayer management entity has enough information to link the response to the corresponding request.
Function
The DL_Connect.request is passed from the LLC sublayer management entity to the LLC entity to request for a connection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Connect.request ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
Use
The DL_Connect.request is transmitted from the LLC management entity to the LLC sublayer entity to initiate the establishment of a connection, utilizing resources that were previously allocated during a successful operation.
The DL_Connect.request is invoked when the use of DL_Data.request/indication primitives should be allowed with Lcls equal to I_CLASS.
Function
The DL_Connect.confirm is passed from the LLC sublayer to the LLC management entity to confirm a DL_Connect.request.
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La sémantique de la primitive est la suivante:
DL_Connect.confirm ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Le paramètre Status indique une mise en place de la connexion réussie si la valeur est zéro, un échec dans tout autre cas.
The DL_Connect.confirm primitive has transitioned from the LLC sublayer entity to the LLC management entity, allowing it to yield the result of a prior DL_Connect.request It is assumed that the management entity of the LLC sublayer possesses sufficient information to correlate the response with the appropriate request.
A success confirmation signifies that the LLC entity has entered operational mode, managing all data transfer service primitives from this point forward, utilizing the appropriate addressing information related to the established connection.
The DL_Data.request primitive, with the parameter Lcls greater than or equal to I_CLASS, originating from LLC user entities before a successful connection setup between the relevant stations, will be rejected using a DL_Data.confirm with the appropriate failure value in Transmission_Status.
La primitive DL_Disconnect.request est transmise de l’entité de gestion de la sous-couche LLC à l’entité LLC pour demander une déconnexion avec une entité LLC éloignée.
La sémantique de la primitive est la suivante:
DL_Disconnect.request ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
The DL_Disconnect.request primitive is sent from the LLC management entity to the LLC sublayer entity to request the termination of a connection, resulting in the LLC entity entering a non-operational mode.
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The semantics of the primitive are as follows:
DL_Connect.confirm ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The Status parameter indicates a successful connection set-up in case of zero value, unsuccessful otherwise.
DL_Disconnect.request
Fonction
La primitive DL_Disconnect.request est transmise de l’entité de gestion de la sous-couche LLC à l’entité LLC pour demander une déconnexion avec une entité LLC éloignée.
Structure
La sémantique de la primitive est la suivante:
DL_Disconnect.request ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Application
The DL_Disconnect.request primitive is sent from the LLC management entity to the LLC sublayer entity to request the termination of a connection, resulting in the LLC entity entering a non-operational mode.
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The semantics of the primitive are as follows:
DL_Connect.confirm ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The Status parameter indicates a successful connection set-up in case of zero value, unsuccessful otherwise.
The DL_Connect.confirm message is transmitted from the LLC sublayer entity to the LLC management entity, signaling the outcome of a prior DL_Connect.request It is expected that the LLC sublayer management entity has adequate information to link the response to the corresponding request.
A successful confirmation signifies that the LLC entity is now operational, managing all data transfer services with the correct address information for connection setup.
Requests from LLC User entities with a Lcls parameter greater than or equal to I_CLASS will be rejected by DL_Data.confirm, accompanied by an appropriate unsuccessful Transmission_status value, prior to establishing a successful connection between the involved stations.
The DL_Disconnect.request is passed from the LLC sublayer management entity to the LLC entity to request for disconnection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Disconnect.request ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The DL_Disconnect.request is sent from the LLC management entity to the LLC sublayer entity to initiate the closure of a connection, resulting in the LLC entity entering a non-operational mode.
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Après la DL_Disconnect.request, les DL_Data.request avec un Lcls égal à I_CLASS, provenant d’entités utilisateur LLC ou pas encore confirmées, seront refusées à l’aide d’un
DL_Data.confirm avec une valeur d’échec appropriée dans Transmission_Status.
Les donnộes utilisateur LLC entrantes en transit, reỗues dans des trames I des entitộs homologues associées et éloignées, seront ignorées.
DL_Disconnect.confirm
Fonction
La primitive DL_Disconnect.confirm est transmise de la sous-couche LLC à l’entité de gestion
LLC pour confirmer une DL_Disconnect.request et pour indiquer que l’entité LLC passera en mode non opérationnel.
Structure
La sémantique de la primitive est la suivante:
DL_Disconnect.confirm ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Le paramètre Status indique la fermeture d’une connexion avec les valeurs suivantes:
– zéro: une réponse positive à une DL_Disconnect.request;
– autres valeurs positives: réponse négative à une DL_Disconnect.request.
Application
The DL_Disconnect.confirm primitive is sent from the LLC sublayer entity to the LLC management entity to provide the outcome of the previous DL_Disconnect.request It indicates that the LLC entity has transitioned to a non-operational mode, assuming that the LLC management entity has sufficient information to associate the response with the appropriate request.
Après une DL_Disconnect.confirm, les DL_Data.request avec un Lcls égal à I_CLASS, provenant d’entités utilisateur LLC, ou pas encore confirmées seront refusées à l’aide d’une
DL_Data.confirm avec la valeur d’échec appropriée dans Transmission_Status.
Les donnộes utilisateur en transit entrantes, reỗues dans des trames I d’entitộs homologues associées et éloignées, seront ignorées.
DL_Disconnect.indication
Fonction
La primitive DL_Disconnect.indication est transmise de la sous-couche LLC à l’entité de gestion LLC pour indiquer que l’entité LLC est passée en mode non opérationnel.
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After the DL_Disconnect.request, DL_Data.requests, with Lcls equal to I_CLASS coming from
LLC User entities or not yet confirmed, will be refused through DL_Data.confirm with an appropriate unsuccessful Transmission_status value.
Incoming LLC User data in transit, received in I frames from the associated remote LLC peer entity, will be discarded.
The DL_Disconnect.confirm is transmitted from the LLC sublayer to the LLC management entity, serving to confirm the DL_Disconnect.request and signaling that the LLC entity has transitioned into a non-operational mode.
The semantics of the primitive are as follows:
DL_Disconnect.confirm ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The Status parameter indicates a connection close-down with the following values:
– in the case of zero, a successful answer to a DL_Disconnect.request;
– other positive values, unsuccessful answer to a DL_Disconnect.request.
The DL_Disconnect.confirm is sent from the LLC sublayer entity to the LLC management entity to communicate the outcome of a prior DL_Disconnect.request, signaling that the LLC entity has transitioned into a non-operational mode, with the assumption that adequate information is accessible.
LLC sublayer management entity to associate the response with the appropriate request.
After the DL_Disconnect.confirm, DL_Data.requests with Lcls equal to I_CLASS, coming from
LLC user entities or not yet confirmed, will be refused through DL_Data.confirm with an appropriate unsuccessful Transmission_Status value.
Incoming LLC User data in transit, received in I frames from the associated remote LLC peer entity, will be discarded.
The DL_Disconnect.indication is passed from the LLC sublayer to the LLC management entity to indicate the LLC entity entered a non-operational mode.
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Structure
La sémantique de la primitive est la suivante:
DL_Disconnect.indication ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion: ce sont obligatoirement des adresses individuelles.
Le paramètre Status indique les causes de la fermeture de la connexion, due à des problèmes de liaison ou à une demande de déconnexion par une entité éloignée.
Application
La primitive DL_Disconnect.indication est transmise de l’entité de la sous-couche LLC à l’entité de gestion LLC pour indiquer que l’entité LLC est passée en mode non opérationnel.
Après une DL_Disconnect.indication, les DL_Data.request avec un Lcls égal à I_CLASS, provenant d’entités utilisateurs LLC, ou pas encore confirmées, seront refusées à l’aide d’une
DL_Data.confirm avec une valeur d’échec appropriée dans Transmission_Status.
Les donnộes utilisateur LLC en transit entrantes, reỗues dans des trames I d’entitộs homologues associées et éloignées, seront ignorées.
DL_Close.request
Fonction
La primitive DL_Close.request est transmise de l’entité de gestion de la sous-couche LLC à l’entité LLC pour demander la désallocation des ressources d’une connexion avec une entité
Structure
La sémantique de la primitive est la suivante:
DL_Close.request ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion.
Application
The DL_Close.request primitive performs the inverse function of DL_Open.request It is sent from the LLC management entity to the LLC sublayer entity to request the deallocation of resources required for a connection, along with the appropriate windowing values.
Les invocations de demandes de service en cours sont terminées à l’aide des primitives de confirmation appropriées avec une valeur d’échec du paramètre Status.
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The semantics of the primitive are as follows:
DL_Disconnect.indication ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection: they must be individual addresses.
The Status parameter indicates the cause of the connection close-down, due to link problems or disconnection requested from remote entity.
The DL_Disconnect.indication is passed from the LLC sublayer entity to the LLC management entity to indicate the LLC entity entered a non-operational mode.
Following the DL_Disconnect.indication, any DL_Data.requests with Lcls set to I_CLASS, whether originating from LLC user entities or those not yet confirmed, will be rejected via DL_Data.confirm, accompanied by a suitable unsuccessful Transmission_Status value.
Incoming LLC user data in transit, received in I frames from the associated remote LLC peer entity, will be discarded.
The DL_Close.request is passed from the LLC sublayer management entity to the LLC entity to request the deallocation of resources for a connection with a remote LLC entity.
The semantics of the primitive are as follows:
DL_ Close.request ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection.
The DL_Close.request serves as the inverse function of the DL_Open.request, facilitating the deallocation of resources required for a connection This request is transmitted from the LLC management entity to the LLC sublayer entity, ensuring the appropriate windowing parameters are applied.
Pending service request invocations are terminated through the appropriate confirm primitives with unsuccessful Status parameter value.
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DL_Close.confirm
Fonction
La primitive DL_Close.confirm est transmise de la sous-couche LLC à l’entité de gestion LLC pour confirmer une DL_Close.request.
Structure
La sémantique de la primitive est la suivante:
DL_Close.confirm ( Destination_address,
Les paramètres Destination_address et Source_address spécifient les adresses de la station locale et des stations éloignées impliquées dans la connexion.
Le paramètre Status indique une fermeture réussie quand il a la valeur zéro, un échec dans tout autre cas.
Application
The DL_Close.confirm primitive is transmitted from the LLC sublayer entity to the LLC management entity to provide the result of a previous DL_Close.request It is assumed that the LLC management entity has sufficient information to associate the response with the appropriate request.
Aucune autre primitive avec le même paramètre d’adresse ne sera acceptée par l’entité de la sous-couche LLC après une DL_Close.request acceptée, en dehors d’une nouvelle
DL_Test.request
Fonction
The DL_Test.request primitive is sent from the management entity of the LLC sublayer to the LLC entity to initiate the testing procedure with a remote LLC entity.
Structure
La sémantique de la primitive est la suivante:
DL_Test.request ( Destination_address,
The parameters Destination_address and Source_address define the addresses of the local station and the remote stations involved in the connection Destination addresses can be either individual addresses or group addresses.
Le paramètre Test_sdu est défini par l’entité utilisateur LLC et inséré dans le champ information d’un cadre d’essais (voir l'article 5).
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The DL_Close.confirm is passed from the LLC sublayer to the LLC management entity to confirm a DL_Close.request.
The semantics of the primitive are as follows:
DL_Close.confirm ( Destination_address,
The Destination_address and Source_address parameters specify the address of the local and of the remote stations involved in the connection.
The Status parameter indicates a successful close in the case of zero value, unsuccessful otherwise.
The DL_Close.confirm message is sent from the LLC sublayer entity to the LLC management entity, signaling the outcome of a prior DL_Close.request It is expected that the LLC sublayer management entity has enough information to link the response to the corresponding request.
No other primitives with the same address parameters are accepted by the LLC sublayer entity after an accepted DL_Close.request, but a new DL_Open.request.
The DL_Test.request is passed from the LLC sublayer management entity to the LLC entity to request the invocation of test procedure with a remote LLC entity.
The semantics of the primitive are as follows:
DL_Test.request ( Destination_address,
The Destination_address and Source_address parameters define the addresses of the local and remote stations in a connection, with the Destination address capable of being either an individual or a group address.
The Test_sdu parameter is defined by LLC user entity and inserted in the information field of a test frame (see clause 5).
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Fonction
La primitive DL_Test.request invoque la procédure d’essais LLC, avec l’échange de trames d’essai entre les stations.
La sémantique des adresses de groupe dans la procédure d’essais est hors du domaine d’application de cette norme.