SIST EN 300 175-4 V1.9.1:2006
(Main)Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
- Abstract
The present document gives an introduction and overview of the complete Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard and layer 2b of the DECT protocol stack.
Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and the User plane (U-plane). The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also provides a separate point-to-multipoint (broadcast) service (Lb). The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed characteristics of those links are determined by the particular needs of each service. The defined services cover a wide range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable delay", for local area network applications. NOTE: The performance of the DLC services need not be tight to any particular application. For example the "unprotected with low delay" service could also be used for data applications, e.g. if some data protection is provided outside the DECT protocol. The present document uses the layered model principles and terminology as described in ITU-T Recommendation X.200 [12] and ITU-T Recommendation X.210 [13].
- Status
- Published
- Publication Date
- 28-Feb-2006
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Mar-2006
- Due Date
- 01-Mar-2006
- Completion Date
- 01-Mar-2006
SIST EN 300 175-4 V1.9.1:2006 is the Slovenian adoption of ETSI EN 300 175-4 for Digital Enhanced Cordless Telecommunications (DECT). It specifies the Data Link Control (DLC) layer of the DECT Common Interface, which is layer 2b of the DECT protocol stack, for the DECT fixed and portable sides. The document defines the Control plane (C-plane) and User plane (U-plane) services, the frames and procedures they use, and the management interfaces around them.
What does SIST EN 300 175-4 V1.9.1:2006 specify?
SIST EN 300 175-4 V1.9.1:2006 specifies the DLC layer for DECT CI and gives an overview of how that layer fits into the full DECT stack. It is focused on link-layer behavior, while the companion DECT parts cover the physical layer, MAC layer, network layer, identities and speech coding.
The document separates the DLC layer into two independent planes:
- the C-plane for signalling and broadcast
- the U-plane for end-to-end user information
Its main structure runs from the overview and references through C-plane service characteristics, frame structures, field formats and procedures, primitives, management procedures, then U-plane service characteristics and U-plane frame structures. The layered terminology follows ITU-T Recommendation X.200 and X.210.
What are the key requirements of SIST EN 300 175-4 V1.9.1:2006?
SIST EN 300 175-4 V1.9.1:2006 defines how DECT link-layer traffic is built, signalled and managed. In practice, an implementation has to choose the right plane, frame type, service class and management procedure for the traffic it carries.
C-plane operation
- Clause 4 states that the C-plane and U-plane are independent and use separate service access points. This matters because signalling traffic and user traffic are handled by different procedures.
- Clause 5 defines two C-plane services: the data link service (LAPC+Lc) and the broadcast service (Lb). The data link service carries reliable point-to-point Network (NWK) messages, while broadcast is point-to-multipoint.
- Clause 6 defines the C-plane frame structures, including delimiters, routing to logical channels and the handling of invalid frames. Invalid frames are discarded without notification, so transmit and receive logic must detect checksum, length and coding faults correctly.
- Clause 7 defines address and control fields such as SAPI, LLN, DLI, the C/R bit, the NLF bit and the P/F bit. The P/F bit is used only in class B operation, so implementers need different handling for class A and class B links.
- Clause 7.11 defines the command and response set, including I, RR, RNR, REJ, SABM, DM, UI, DISC and UA. These frames drive acknowledgement, flow control, re-establishment, release and unacknowledged transfer.
Interfaces and management
- Clause 8 defines primitives between DLC and the NWK layer, the MAC layer and the interworking unit. These are the software calls that establish, release, move, suspend, resume, encrypt and broadcast data.
- Clause 10 covers management for MAC connections, logical channel selection, link signature, routing, connection handover, ciphering and broadband data link management. This is the control logic needed to keep links usable during setup, movement and security changes.
U-plane operation
- Clause 11 defines several U-plane services, including TRUP, FREL, FSWI, FEC, BRAT, SRAT, ESC, LU7 64 kbit/s bearer service, EFREL and LU11. These services cover unprotected transport, protected transport, rate adaptation and error control.
- Clause 12 defines the U-plane frame families FU1 to FU10 and explains what each frame carries - addressing, length, sequencing, or combinations of these. This lets the designer match the frame type to the delay, reliability and direction needed by the application.
What terms does SIST EN 300 175-4 V1.9.1:2006 define?
- Control plane (C-plane) - The part of the DLC layer that carries DECT signalling and broadcast control traffic.
- User plane (U-plane) - The part of the DLC layer that carries end-to-end user information and application-dependent procedures.
- Lower Layer Management Entity (LLME) - The management entity that handles lower-layer control functions such as connection and service management.
- Multi-Channel Set (MCS) - The LU5 multiplex group that combines one, two or three channels into a multiplexed data unit.
- Logical Link Number (LLN) - The value that identifies a LAPC entity for a frame and distinguishes class U, class A and class B operation.
- Data Link Identifier (DLI) - The identifier formed from LLN and MCI to uniquely identify a LAPC instance within the FT and PT.
- Forward Error Control (FEC) - The coding method used in LU7 and LU11 to add parity and correct errors over the radio link.
Who uses SIST EN 300 175-4 V1.9.1:2006?
SIST EN 300 175-4 V1.9.1:2006 is used by DECT equipment designers, protocol-stack engineers, radio firmware developers, interworking-unit implementers, test laboratories and compliance teams. It is also relevant to buyers and quality managers who need to confirm that a product supports the right DECT link-layer services, frame types and management behavior.
Which standards are used with SIST EN 300 175-4 V1.9.1:2006?
- EN 300 175-1 - Provides the overall DECT Common Interface overview and the basic terms and definitions used by this part.
- EN 300 175-2 - Defines the physical layer used under the DLC layer.
- EN 300 175-3 - Defines the MAC layer and the lower-layer primitives used by DLC.
- EN 300 175-5 - Defines the DECT Network (NWK) layer, including messages and service change procedures referenced by U-plane and management clauses.
- EN 300 175-6 - Provides identities and addressing used in DECT.
- EN 300 175-8 - Covers speech coding and transmission.
- ETSI TS 144 006 - Gives a related data link layer specification from the 3GPP environment.
- ITU-T Q.920 / Q.921 - Provide general data link-layer aspects and bit conventions for control fields.
- ITU-T V.42 / V.110 - Provide error-correcting and rate-adaptation procedures used by LU6.
- ITU-T X.200 / X.210 - Provide the layered-model terminology used by the document.
- ISO/IEC 8073 - Provides the checksum basis referenced for the underlying checksum calculation.
What does the SIST EN 300 175-4 V1.9.1:2006 document contain?
The document contains the DLC layer overview, detailed C-plane field codings, command and response formats, peer-to-peer procedures, primitive definitions and management procedures. It also contains U-plane service descriptions for transport, frame relay, frame switching, rate adaptation, error correction and data-bearer services.
It includes tables and figures for address fields, control fields, frame structures, sequence handling, segmentation, interleaving, rate coding and error-control behavior. For implementers, those tables and figures are the working material for coding, interworking and conformance testing.
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Frequently Asked Questions
SIST EN 300 175-4 V1.9.1:2006 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer". This standard covers: The present document gives an introduction and overview of the complete Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard and layer 2b of the DECT protocol stack. Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and the User plane (U-plane). The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also provides a separate point-to-multipoint (broadcast) service (Lb). The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed characteristics of those links are determined by the particular needs of each service. The defined services cover a wide range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable delay", for local area network applications. NOTE: The performance of the DLC services need not be tight to any particular application. For example the "unprotected with low delay" service could also be used for data applications, e.g. if some data protection is provided outside the DECT protocol. The present document uses the layered model principles and terminology as described in ITU-T Recommendation X.200 [12] and ITU-T Recommendation X.210 [13].
The present document gives an introduction and overview of the complete Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document specifies the Data Link Control (DLC) layer. The DLC layer is part 4 of the DECT CI standard and layer 2b of the DECT protocol stack. Two planes of operation are specified for this DLC (sub)layer. These planes are called the Control plane (C-plane) and the User plane (U-plane). The C-plane is mostly concerned with the DECT signalling aspects. It provides a reliable point-to-point service that uses a link access protocol to offer error protected transmission of Network (NWK) layer messages. The C-plane also provides a separate point-to-multipoint (broadcast) service (Lb). The U-plane is only concerned with end-to-end user information. This plane contains most of the application dependent procedures of DECT. Several alternative services (both circuit-mode and packet-mode) are defined as a family of independent entities. Each service provides one or more point-to-point U-plane data links, where the detailed characteristics of those links are determined by the particular needs of each service. The defined services cover a wide range of performance, from "unprotected with low delay" for speech applications to "highly protected with variable delay", for local area network applications. NOTE: The performance of the DLC services need not be tight to any particular application. For example the "unprotected with low delay" service could also be used for data applications, e.g. if some data protection is provided outside the DECT protocol. The present document uses the layered model principles and terminology as described in ITU-T Recommendation X.200 [12] and ITU-T Recommendation X.210 [13].
SIST EN 300 175-4 V1.9.1:2006 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT); 35.100.20 - Data link layer. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 175-4 V1.9.1:2006 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer35.100.20Podatkovni povezovalni slojData link layer33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)ICS:Ta slovenski standard je istoveten z:EN 300 175-4 Version 1.9.1SIST EN 300 175-4 V1.9.1:2006en01-marec-2006SIST EN 300 175-4 V1.9.1:2006SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-4 V1.9.1 (2005-09) 2
Reference REN/DECT-000229-4 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
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DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 175-4 V1.9.1:2006
ETSI ETSI EN 300 175-4 V1.9.1 (2005-09) 3
Contents Intellectual Property Rights.11 Foreword.11 1 Scope.12 2 References.12 3 Definitions, symbols and abbreviations.13 3.1 Definitions.13 3.2 Symbols.13 3.3 Abbreviations.14 4 Data Link Control (DLC) layer overview.15 4.1 General.15 4.2 C-plane services.16 4.3 U-plane services.17 4.4 Lower Layer Management Entity (LLME).19 5 C-plane service characteristics.19 5.1 Data link service (LAPC+Lc).19 5.1.1 General.19 5.1.2 LAPC types of operation.20 5.1.3 Establishment of information transfer modes.20 5.1.3.1 Data Link Identifier (DLI).20 5.1.3.2 LAPC states.20 5.2 Broadcast service (Lb).21 6 Frame structures for C-plane services.22 6.1 Data link service frame structure.22 6.1.1 General frame structure.22 6.1.2 Lc frame delimiting and transparency.23 6.1.3 Transmission order.23 6.1.4 Routing to logical channels.23 6.1.4.1 CF/CLF logical channel.23 6.1.4.2 CS/CLS logical channel.24 6.1.5 Invalid frames.24 6.2 Broadcast service frame structure.25 6.2.1 Standard frame structure.25 6.2.2 Extended frame structure.25 7 Elements of procedures and formats of fields for C-plane peer-to-peer communication.26 7.1 General.26 7.2 Address field formats.26 7.3 Address field parameters.26 7.3.1 REServed bit (RES).26 7.3.2 Command Response (C/R) bit.26 7.3.3 SAPI field.26 7.3.4 New Link Flag (NLF) bit.27 7.3.5 LLN-field.27 7.3.6 Data Link Identifiers (DLI).27 7.4 Control field formats.27 7.5 Control field parameters.28 7.5.1 Poll/Final (P/F) bit.28 7.5.2 Multiple frame operation variables and sequence numbers.28 7.5.2.1 Modulus.28 7.5.2.2 Send state Variable V(S).28 7.5.2.3 Acknowledge state Variable V(A).29 7.5.2.4 Send sequence Number N(S).29 7.5.2.5 Receive state Variable V(R).29 SIST EN 300 175-4 V1.9.1:2006
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7.5.2.6 Receive sequence Number N(R).29 7.5.3 Unacknowledged operation variables and sequence numbers.29 7.5.4 Supervisory and Unnumbered function bits S and U.29 7.6 Length indicator field format.29 7.7 Length indicator field parameters.30 7.7.1 Length indicator field extension bit (N).30 7.7.2 More data bit (M).30 7.7.3 Length parameter (LI).30 7.7.4 Extended length parameter (LJJ).31 7.7.5 Reserved bit (RES).31 7.8 Fill field format.31 7.9 Checksum field format.31 7.10 Checksum field parameters.31 7.11 Commands and responses.32 7.11.1 Information (I) command.33 7.11.2 Receive Ready (RR) command/response.33 7.11.3 Receive Not Ready (RNR) command/response.34 7.11.4 REJect (REJ) command/response.34 7.11.5 Set Asynchronous Balanced Mode (SABM) command.34 7.11.6 Disconnect Mode (DM) response.34 7.11.7 Unnumbered Information (UI) command.34 7.11.8 DISConnect (DISC) command.35 7.11.9 Unnumbered ACK (UA) response.35 8 Primitives.35 8.1 Primitive types.35 8.2 Primitives to the MAC layer (lower layer).35 8.3 Primitives to the NWK layer (higher layer).35 8.3.1 Parameter definitions.36 8.3.2 S-SAP primitives.37 8.3.2.1 DL_ESTABLISH primitive.37 8.3.2.2 DL_RELEASE primitive.37 8.3.2.3 DL_DATA primitive.38 8.3.2.4 DL_UNIT_DATA primitive.38 8.3.2.5 DL_SUSPEND primitive.38 8.3.2.6 DL_RESUME primitive.38 8.3.2.7 DL_ENC_KEY primitive.39 8.3.2.8 DL_ENCRYPT primitive.39 8.3.2.9 DL_SERVICE_MOD primitive.39 8.3.3 B-SAP primitives.39 8.3.3.1 DL_BROADCAST primitive.40 8.3.3.2 DL_EXPEDITED primitive.40 8.4 Primitives to the interworking unit.40 8.4.1 Parameter definitions.40 8.4.2 LUX-SAP primitives.41 8.4.2.1 DL_U_DATA primitive.41 8.4.2.2 DL_U_UNIT_DATA primitive.41 8.4.2.3 DL_U_ERROR primitive.41 9 C-plane peer-to-peer procedures.42 9.1 General.42 9.2 Point to point acknowledged operation.42 9.2.1 Procedure for the use of the P/F bit.42 9.2.1.1 Class A acknowledged information transfer.42 9.2.1.2 Class B acknowledged information transfer.43 9.2.2 Use of LLN.43 9.2.2.1 Class A operation.43 9.2.2.2 Class B operation.43 9.2.3 Link establishment and information transfer in class A operation.43 9.2.3.1 Establishing class A operation.43 9.2.3.2 Class A acknowledged information transfer.44 9.2.3.3 Transmission of class A I-frames.44 SIST EN 300 175-4 V1.9.1:2006
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9.2.3.4 Reception of class A I-frames.45 9.2.3.5 Receiving acknowledgements.45 9.2.3.6 Waiting for acknowledgement.45 9.2.3.7 Release of class A operation.46 9.2.3.8 Re-establishment of class A operation.46 9.2.4 Establishing class B multiple frame operation.46 9.2.4.1 Overview.46 9.2.4.2 Class B multiple frame establishment procedures.47 9.2.4.3 Class B LLN assignment procedures.48 9.2.4.3.1 PT establishment.48 9.2.4.3.2 FT establishment.49 9.2.5 Link maintenance and information transfer in class B multiple frame operation.49 9.2.5.1 Transmitting I-frames.49 9.2.5.2 Receiving I-frames.50 9.2.5.2.1 P bit set to 1.50 9.2.5.2.2 P bit set to 0.50 9.2.5.3 Sending and receiving acknowledgements.50 9.2.5.3.1 Sending acknowledgements.50 9.2.5.3.2 Receiving acknowledgements.50 9.2.5.4 Receiving REJ-frames.51 9.2.5.5 Receiving RNR-frames.52 9.2.5.6 LAPC own receiver busy condition.53 9.2.5.7 Waiting acknowledgement.53 9.2.5.8 Appropriate supervisory frame.54 9.2.6 Release of class B multiple frame operation.54 9.2.7 Link suspension and resumption.55 9.2.7.1 Link suspension.55 9.2.7.1.1 Class B acknowledged suspend.55 9.2.7.1.2 Unacknowledged suspend.56 9.2.7.2 Class B link resumption.56 9.2.7.3 Connection handover.57 9.2.7.3.1 Class A connection handover.59 9.2.7.3.2 Class B connection handover.59 9.2.7.3.3 Expiry of connection handover timer.60 9.2.8 Re-establishment of class B multi-frame operation.60 9.2.8.1 Criteria for re-establishment.60 9.2.8.2 Procedure.61 9.2.9 Exception handling.61 9.2.9.1 General.61 9.2.9.2 Class B exception condition reporting and recovery.61 9.2.9.2.1 N(S) sequence error.62 9.2.9.2.2 N(R) sequence error.62 9.2.9.2.3 Timer recovery condition.62 9.2.9.2.4 Collision of identical transmitted and received commands.62 9.3 Unacknowledged operation.62 9.3.1 Use of LLN for unacknowledged information transfer.62 9.3.2 Class U link establishment.63 9.3.3 Unacknowledged information transfer.63 9.3.3.1 Transmission of unacknowledged information.63 9.3.3.2 Reception of unacknowledged information.63 9.3.4 Unacknowledged release.63 9.4 Broadcast operation.63 9.4.1 Normal operation.63 9.4.1.1 Procedure in the Fixed radio Termination (FT).63 9.4.1.2 Procedure in the Portable radio Termination (PT).64 9.4.2 Expedited operation.64 9.4.2.1 Procedure in the Fixed radio Termination (FT).64 9.4.2.2 Procedure in the Portable radio Termination (PT).64 9.5 MAC layer interfaces.64 9.5.1 MC-SAP.64 9.5.1.1 C-plane overview.64 9.5.1.2 C-plane service data procedures.65 SIST EN 300 175-4 V1.9.1:2006
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9.5.1.3 U-plane service data.65 9.5.2 MB-SAP.66 9.5.2.1 C-plane service data procedures.66 9.5.2.2 U-plane service data.66 9.5.3 MA-SAP.66 9.5.3.1 Overview.66 9.5.3.2 Service data procedures.67 10 Management procedures.67 10.1 Lower Layer Management Entity (LLME).67 10.2 MAC connection management.67 10.2.1 MAC connection set-up.67 10.2.2 MAC connection release.68 10.2.3 MAC connection modification.68 10.2.4 MAC connection identifiers.69 10.2.4.1 Overview.69 10.2.4.2 Advanced MAC Connection Identifiers (AMCI).69 10.2.4.3 Basic MAC Connection Identifiers (BMCI).70 10.2.4.4 MAC Connection Endpoint Identifier (MCEI).70 10.2.5 Selection of logical channel (CS or CF).70 10.3 DLC C-plane (LAPC) management.70 10.3.1 Provision of link signature.71 10.3.2 Routing of connection oriented links.71 10.3.3 Routing of connectionless links.71 10.4 DLC U-plane (LUX) management.71 10.4.1 U-plane establishment.71 10.4.2 U-plane release.72 10.4.3 U-plane suspend and resume.72 10.5 Connection handover management.72 10.6 Ciphering management.73 10.6.1 Ciphering management in cases where the NWK layer executes the ciphering related MM procedure.73 10.6.1.1 Providing a key to the MAC layer.73 10.6.1.2 Starting and stopping the ciphering.73 10.6.1.3 Connection handover.74 10.6.2 Ciphering management in cases where the NWK layer does not execute the ciphering related MM procedure.74 10.7 Broadband data link management.74 11 U-plane service characteristics.75 11.1 General.75 11.2 LU1 TRansparent UnProtected service (TRUP).75 11.3 LU2 Frame RELay service (FREL).76 11.3.1 General.76 11.3.2 Checksum operation.77 11.3.3 Segmentation and transmission class.77 11.3.4 Data transmission.78 11.3.4.1 Send side procedure.78 11.3.4.2 Receive side procedure.78 11.4 LU3 Frame SWItching service (FSWI).78 11.5 LU4 Forward Error Correction (FEC) service.79 11.6 LU5 Basic Rate Adaption service (BRAT).79 11.6.1 Overview.79 11.6.2 Protected service operation.80 11.6.2.1 General.80 11.6.2.2 Data buffering and initial rate adaptation.81 11.6.2.3 Multi-channel set multiplexing.82 11.6.2.4 Segmentation of Multiplexed Data Units (MDU).83 11.6.2.5 Frame sequencing and addition of control and fill octets.84 11.6.2.6 Frame transmission.85 11.6.3 Unprotected service operation.85 11.6.3.1 General.85 11.6.3.2 Data buffering and initial rate adaption.86 SIST EN 300 175-4 V1.9.1:2006
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11.6.3.3 Multi-channel set multiplexing.86 11.6.3.4 Segmentation of MDUs.87 11.6.3.5 Frame transmission.87 11.7 LU6 Secondary Rate AdapTion (SRAT) service.88 11.7.1 General.88 11.8 LU16 ESCape Service (ESC).89 11.8.1 General.89 11.9 LU7 64 kbit/s data bearer service.89 11.9.1 General.89 11.9.2 Physical layer service.89 11.9.3 MAC layer service.90 11.9.4 DLC layer service.90 11.9.4.1 Architectural model.90 11.9.4.1.1 Transmit (Tx) frame buffering.90 11.9.4.1.2 Receive (Rx) frame buffering.90 11.9.4.2 Automatic-Repeat-Request (ARQ) and Forward Error Control (FEC).90 11.9.4.2.1 Control field.92 11.9.4.2.2 Information field.94 11.9.4.2.3 ARQ checksum.94 11.9.4.3 Procedures for normal operation.95 11.9.4.3.1 Establishment and synchronization procedures.95 11.9.4.3.2 Active phase.97 11.9.4.3.3 Release.98 11.9.4.4 Exceptional procedures.98 11.9.4.4.1 Invalid frame condition.98 11.9.4.4.2 Establishment.99 11.9.4.4.3 Transmitting frames.99 11.9.4.4.4 Receiving frames.99 11.9.4.4.5 Sending acknowledgements.99 11.9.4.4.6 Forwarding of received data.99 11.9.4.4.7 N(R) sequence error.99 11.9.4.4.8 N(O) sequence error.99 11.9.4.4.9 N(S) sequence error.100 11.9.4.4.10 Format error.100 11.9.4.4.11 Abnormal release.100 11.9.4.4.12 Implicit reset.100 11.9.5 Network layer service.101 11.9.5.1 LCE service.101 11.9.5.2 CC service.101 11.10 LU8 service.101 11.10.1 Physical layer service.101 11.10.2 MAC layer service.
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