SIST EN 300 175-4 V1.8.1:2006
(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. 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 V1.8.1:2006 is the SIST adoption of ETSI EN 300 175-4 V1.8.1 for Digital Enhanced Cordless Telecommunications (DECT) Common Interface Part 4. It specifies the DECT Data Link Control (DLC) layer, which is layer 2b of the DECT protocol stack, for use between the MAC layer and the Network (NWK) layer. The document covers control-plane signalling, user-plane data transport, frame formats, procedures, primitives, and management functions for DECT links.
What does SIST EN 300 175-4 V1.8.1:2006 specify?
SIST EN 300 175-4 V1.8.1:2006 specifies how the DECT DLC layer works and how its services are organized. It divides the DLC layer into two independent planes: the Control plane (C-plane) and the User plane (U-plane).
The document is structured to move from overview to detailed operation:
- Clause 4 gives the DLC layer overview.
- Clauses 5 to 10 cover C-plane services, frame structures, peer-to-peer procedures, primitives, and management.
- Clause 11 covers U-plane service characteristics.
- Clause 12 defines the U-plane frame structures.
In practice, this means the standard tells implementers how DECT signalling, user data, and management messages are carried and controlled across the air interface.
What are the key requirements of SIST EN 300 175-4 V1.8.1:2006?
SIST EN 300 175-4 V1.8.1:2006 defines three C-plane service classes and a family of U-plane services, with different levels of acknowledgment, protection, and delay. The choices matter because they determine whether a link is used for signalling, speech, or data, and how much error handling and flow control is available.
C-plane operation
Clause 5 defines the data link service LAPC+Lc with three classes:
- Class U - unacknowledged transfer
- Class A - single-frame acknowledged transfer
- Class B - multiple-frame acknowledged transfer
Class A and Class B are point-to-point only, while Class U can also be used for point-to-multipoint broadcast. LAPC provides segmentation, error detection, recovery, flow control, and suspend/resume; Lc provides frame delimiting, checksum handling, routing to logical channels, and connection handover.
Link identifiers and states
Clause 5.1.3 and clause 7.3 define the link identifiers used to keep each DECT link distinct. The Data Link Identifier (DLI) stays constant through bearer or connection handovers, which is important for continuity during mobility. Clause 5.1.3.2 defines three LAPC states: unassigned link identifier, assigned link identifier, and assigned link identifier/multiple frame state.
Frames, fields, and error handling
Clauses 6 and 7 define the C-plane frame structures and field coding. The address field uses C/R, SAPI, NLF, LLN, and RES, with SAPI 0 for connection-oriented signalling and SAPI 3 for connectionless signalling. Clause 6.1.5 says invalid frames are discarded without notification to the sender, so implementations must not try to recover from malformed frames at this layer.
Clause 7.11 defines the main commands and responses: I, RR, RNR, REJ, SABM, DM, UI, DISC, and UA. These control data transfer, acknowledgements, retries, link setup, release, and busy conditions. In class B, the P/F bit is used for polling and final response handling.
Primitives and management
Clause 8 defines service primitives to the NWK layer and to the interworking unit. These include DL_ESTABLISH, DL_RELEASE, DL_DATA, DL_UNIT_DATA, DL_SUSPEND, DL_RESUME, DL_ENC_KEY, DL_ENCRYPT, DL_SERVICE_MOD, DL_BROADCAST, DL_EXPEDITED, DL_U_DATA, DL_U_UNIT_DATA, and DL_U_ERROR. In practice, these are the service entry points software uses to start, stop, protect, and route link traffic.
Clause 10 defines management functions for MAC connections, LAPC and LUX routing, handover, ciphering, and broadband data link management. This is the part implementers use to coordinate link setup, mobility, and security behavior.
U-plane services
Clause 11 defines the U-plane service family LU1 to LU16, including TRUP, FREL, FSWI, FEC, BRAT, LU7, LU10, LU11, and LU16. Some services are unprotected and low-delay, while others add frame relay, error correction, rate adaptation, or an escape path for non-standard use. This gives equipment designers several link types for speech, bearer services, and data transport.
What terms does SIST EN 300 175-4 V1.8.1:2006 define?
- Data Link Control (DLC) - The DECT layer that carries link control and user data between the MAC layer and the NWK layer.
- Control plane (C-plane) - The DLC plane used mainly for DECT signalling and reliable error-protected transfer of NWK messages.
- User plane (U-plane) - The DLC plane used for end-to-end user information and application-dependent procedures.
- LAPC - The C-plane protocol entity used for DECT data link service.
- Lc - The lower C-plane function that handles frame delimiting, checksum, routing, and connection handover.
- Lower Layer Management Entity (LLME) - The management function that coordinates C-plane and U-plane routing and MAC connection control.
- Data Link Identifier (DLI) - The identifier that uniquely distinguishes each LAPC instance within a fixed and portable part.
- Service Access Point Identifier (SAPI) - The field that identifies which higher-layer service a frame belongs to.
Who uses SIST EN 300 175-4 V1.8.1:2006?
This standard is used by DECT chipset vendors, cordless phone manufacturers, base station and handset developers, and software teams implementing DECT protocol stacks. It is also used by test engineers and quality managers who need to verify link establishment, acknowledgements, frame handling, broadcast operation, handover, and ciphering behavior. Buyers and integrators use it to confirm that equipment supports the right DECT DLC services for signalling, voice, or data.
Which standards are used with SIST EN 300 175-4 V1.8.1:2006?
The document references the DECT companion parts that define the rest of the stack:
- EN 300 175-1 - overview of the DECT Common Interface
- EN 300 175-2 - physical layer
- EN 300 175-3 - MAC layer, including lower SAPs and MAC interaction
- EN 300 175-5 - NWK layer and higher-layer message mapping
- EN 300 175-6 - identities and addressing
- EN 300 175-8 - speech coding and transmission
It also references:
- ETSI TS 144 006 - data link layer specification for the GSM/3GPP MS-BSS interface
- ITU-T Q.920 and Q.921 - general ISDN data link layer aspects and specification patterns
- ITU-T V.42 and V.110 - error correction and rate-adaptation concepts
- ITU-T X.200 and X.210 - layered model principles and service conventions
- ISO/IEC 8073 - checksum basis referenced for the DLC checksum method
What does the SIST EN 300 175-4 V1.8.1:2006 document contain?
The document contains field formats, frame layouts, state machines, procedures, primitive definitions, and management behavior for DECT DLC operation. It includes detailed coding for address and control fields, checksum handling, and the command/response set used by C-plane links. It also includes service descriptions and procedure detail for U-plane services such as LU7, LU10, LU11, and LU16.
For implementation work, the most useful parts are the frame format figures, the state and sequence-number rules, the primitive tables, and the service-specific procedures in the U-plane clauses. These are the parts engineers use when designing protocol software, verifying interoperability, and checking link behavior in testing.
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Frequently Asked Questions
SIST EN 300 175-4 V1.8.1:2006 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. 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. 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 V1.8.1:2006 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 V1.8.1:2006 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 1.8.1SIST EN 300 175-4 V1.8.1:2006en01-marec-2006SIST EN 300 175-4 V1.8.1:2006SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 2
Reference REN/DECT-000215-4 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 V1.8.1:2006
ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 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.13 4 Data Link Control (DLC) layer overview.15 4.1 General.15 4.2 C-plane services.16 4.3 U-plane services.16 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.27 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.28 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).29 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 V1.8.1:2006
ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 4
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.30 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).31 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.32 7.10 Checksum field parameters.32 7.11 Commands and responses.33 7.11.1 Information (I) command.33 7.11.2 Receive Ready (RR) command/response.34 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.35 7.11.7 Unnumbered Information (UI) command.35 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).36 8.3 Primitives to the NWK layer (higher layer).36 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.38 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.39 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.40 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 V1.8.1:2006
ETSI ETSI EN 300 175-4 V1.8.1 (2004-11) 5
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.57 9.2.7.3 Connection handover.58 9.2.7.3.1 Class A connection handover.59 9.2.7.3.2 Class B connection handover.60 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.62 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.63 9.3.1 Use of LLN for unacknowledged information transfer.63 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.64 9.4.1 Normal operation.64 9.4.1.1 Procedure in the Fixed radio Termination (FT).64 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.65 9.5.1 MC-SAP.65 9.5.1.1 C-plane overview.65 9.5.1.2 C-plane service data procedures.65 SIST EN 300 175-4 V1.8.1:2006
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9.5.1.3 U-plane service data.66 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.67 9.5.3.1 Overview.67 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.68 10.2.1 MAC connection set-up.68 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.71 10.3.1 Provision of link signature.71 10.3.2 Routing of connection oriented links.71 10.3.3 Routing of connectionless links.72 10.4 DLC U-plane (LUX) management.72 10.4.1 U-plane establishment.72 10.4.2 U-plane release.72 10.4.3 U-plane suspend and resume.72 10.5 Connection handover management.73 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.74 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).79 11.5 LU4 Forward Error Correction (FEC) service.79 11.6 LU5 Basic Rate Adaption service (BRAT).80 11.6.1 Overview.80 11.6.2 Protected service operation.81 11.6.2.1 General.81 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.86 11.6.3.1 General.86 11.6.3.2 Data buffering and initial rate adaption.86 SIST EN 300 175-4 V1.8.1:2006
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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.88 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.90 11.9.1 General.90 11.9.2 Physical layer service.90 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.91 11.9.4.1.2 Receive (Rx) frame buffering.91 11.9.4.2 Automatic-Repeat-Request (ARQ) and Forward Error Control (FEC).91 11.9.4.2.1 Control field.92 11.9.4.2.2 Information field.94 11.9.4.2.3 ARQ checksum.95 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.99 11.9.4.4 Exceptional procedures.99 11.9.4.4.1 Invalid frame condition.99 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.100 11.9.4.4.6 Forwarding of received data.100 11.9.4.4.7 N(R) sequence error.100 11.9.4.4.8 N(O) sequence error.100 11.9.4.4.9 N(S) sequence error.101 11.9.4.4.10 Format error.101 11.9.4.4.11 Abnormal release.101 11.9.4.4.12 Implicit reset.101 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.102 11.10.1 Physical layer service.102 11.10.2 MAC layer service.
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