SIST EN 300 175-4 V1.7.1:2003
(Main)Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) layer
- Abstract
Maintenance update to include elements for the high speed DECT service.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 175-4 V1.7.1:2003 is the Slovenian edition of ETSI EN 300 175-4 V1.7.1, published by SIST. It specifies the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI) Data Link Control (DLC) layer, including the control plane (C-plane) and user plane (U-plane) procedures used by DECT radio fixed parts, portable parts, and interworking units. The scope says it is a maintenance update that adds elements for the high speed DECT service.
What does SIST EN 300 175-4 V1.7.1:2003 specify?
SIST EN 300 175-4 V1.7.1:2003 specifies DECT DLC layer behaviour at layer 2b of the DECT protocol stack. It covers signalling traffic on the C-plane and user data on the U-plane, so implementers can build the link layer that sits between the MAC layer and the NWK layer.
The document is organized into clauses on:
- Scope, references, and terms
- A DLC overview with C-plane, U-plane, and LLME roles
- C-plane service characteristics and frame structures
- Field formats, commands, primitives, and peer-to-peer procedures
- Management procedures
- U-plane service characteristics, including the LU service family
In practice, that structure lets a reader find the service model first, then the frame coding and procedures, and finally the service-specific U-plane options.
What are the key requirements of SIST EN 300 175-4 V1.7.1:2003?
SIST EN 300 175-4 V1.7.1:2003 splits DLC operation into two planes. The C-plane provides reliable point-to-point signalling and a broadcast service, while the U-plane carries end-to-end user information. This distinction matters because signalling, broadcast control, and payload traffic are handled differently.
C-plane service classes and link behaviour
Clause 5 defines three C-plane service classes through LAPC+Lc:
- Class U - unacknowledged service
- Class A - single-frame acknowledged service
- Class B - multiple-frame acknowledged service
Each LAPC instance supports one class of operation for one data link between one FT and one PT. In practice, this means the implementer chooses the link behaviour according to the reliability and traffic pattern needed for the connection.
Frame formats and invalid frames
Clause 6 defines the C-plane data link frame structure and the broadcast frame structure. Invalid frames are discarded if they contain a checksum error, an unsupported or unassigned identifier, an undefined control field, or an invalid length indicator. For a receiver, that means bad frames are dropped without side effects instead of being forwarded up the stack.
Addressing and control coding
Clause 7 defines the address field and control field coding. The SAPI identifies signalling use, with 0 for connection-oriented signalling and 3 for connectionless signalling, while LLN and DLI identify the link instance. Clause 7 also defines the I, S, and U control formats and the command set RR, RNR, REJ, SABM, DM, UI, DISC, and UA. In practice, both sides must use the same coding for acknowledgements, mode setting, release, and unnumbered transfer.
Primitives and management
Clause 8 maps the DLC service to primitives such as DL_ESTABLISH, DL_RELEASE, DL_DATA, DL_UNIT_DATA, DL_SUSPEND, DL_RESUME, DL_BROADCAST, DL_EXPEDITED, DL_U_DATA, DL_U_UNIT_DATA, and DL_U_ERROR. Clause 10 assigns the LLME responsibility for routing, MAC connection control, handover, and ciphering management. This is the part that implementers turn into API calls and internal link-control logic.
U-plane service family
Clause 11 defines multiple U-plane services, including TRUP, FREL, FSWI, FEC, BRAT, SRAT, ESC, LU7, LU8, LU9, LU10, and LU11. The family covers low-delay unprotected traffic, protected framed services, rate adaption, escape coding, and bearer services such as the 64 kbit/s data bearer service. This matters because DECT systems select the service according to delay, protection, and rate needs.
What terms does SIST EN 300 175-4 V1.7.1:2003 define?
- C-plane - The control plane of the DLC layer, used mainly for DECT signalling and control traffic.
- U-plane - The user plane of the DLC layer, used for end-to-end user information.
- LAPC - The DLC layer C-plane protocol entity that provides link functions for one data link.
- LLME - The Lower Layer Management Entity that coordinates routing and MAC connection control.
- SAPI - The Service Access Point Identifier that selects the signalling service associated with a frame.
- LLN - The Logical Link Number that identifies a LAPC entity within a PT.
- DLI - The Data Link Identifier formed from LLN and MCI to identify a LAPC instance.
- DLEI - The Data Link Endpoint Identifier formed from SAPI, LLN, and MCI to identify the endpoint.
Who uses SIST EN 300 175-4 V1.7.1:2003?
SIST EN 300 175-4 V1.7.1:2003 is used by DECT equipment designers, protocol implementers, and interworking-unit developers who need the DLC layer to behave consistently across fixed parts and portable parts. It is also relevant to test labs, quality managers, and buyers checking whether a product supports the required DECT link services, primitives, and frame handling.
Which standards are used with SIST EN 300 175-4 V1.7.1:2003?
- EN 300 175-1 - Gives the DECT overview and the shared terms and definitions used by this part.
- EN 300 175-2 - Provides the DECT physical layer referenced by the DLC procedures.
- EN 300 175-3 - Provides the MAC layer below the DLC layer.
- EN 300 175-5 - Provides the network layer and the mapping used for higher-layer signalling and broadcast content.
- EN 300 175-8 - Provides speech coding and transmission references used by DECT services.
- ETSI TS 144 006 - Gives a related data link layer specification from the GSM/3GPP environment.
- ITU-T Q.920 and Q.921 - Provide general data link layer concepts and frame-control conventions.
- ITU-T V.42, V.110, X.200, X.210, and ISO/IEC 8073 - Provide error-control, rate-adaptation, layering, and checksum concepts referenced by the DLC procedures.
What does the SIST EN 300 175-4 V1.7.1:2003 document contain?
The document contains field codings, frame formats, procedure flows, primitive tables, and management models for DECT DLC operation. It includes figures for the layered architecture, broadcast frame formats, and U-plane service models, plus tables for commands, primitives, service classes, and rate coding.
It also lays out detailed state-machine style procedures for acknowledged and unacknowledged C-plane operation, including establishment, maintenance, release, suspension, resumption, handover, and exception handling. On the U-plane side, it describes several service families and their buffering, sequencing, segmentation, and error-control methods.
For implementation work, these sections support software design, interoperability testing, and conformance review of DECT link-layer behaviour.
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Frequently Asked Questions
SIST EN 300 175-4 V1.7.1:2003 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: Maintenance update to include elements for the high speed DECT service.
Maintenance update to include elements for the high speed DECT service.
SIST EN 300 175-4 V1.7.1:2003 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 V1.7.1:2003 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 1.7.1SIST EN 300 175-4 V1.7.1:2003en01-december-2003SIST EN 300 175-4 V1.7.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-4 V1.7.1 (2003-07) 2
Reference REN/DECT-000201-4 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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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 V1.7.1:2003
ETSI ETSI EN 300 175-4 V1.7.1 (2003-07) 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 and abbreviations.13 4 Data Link Control (DLC) layer overview.15 4.1 General.15 4.2 C-plane services.15 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.29 7.5.2.1 Modulus.29 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 V1.7.1:2003
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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.30 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 V1.7.1:2003
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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 9.2.7.1.2.1 Class A.56 9.2.7.1.2.2 Class B.56 9.2.7.1.2.3 Class U.57 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 SIST EN 300 175-4 V1.7.1:2003
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9.5.1 MC-SAP.65 9.5.1.1 C-plane overview.65 9.5.1.2 C-plane service data procedures.65 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.67 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.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 11 U-plane service characteristics.74 11.1 General.74 11.2 LU1 TRansparent UnProtected service (TRUP).75 11.3 LU2 Frame RELay service (FREL).75 11.3.1 General.75 11.3.2 Checksum operation.76 11.3.3 Segmentation and transmission class.77 11.3.4 Data transmission.77 11.3.4.1 Send side procedure.77 11.3.4.2 Receive side procedure.77 11.4 LU3 Frame SWItching service (FSWI).78 11.5 LU4 Forward Error Correction service (FEC).78 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.80 11.6.2.3 Multi-channel set multiplexing.81 11.6.2.4 Segmentation of Multiplexed Data Units (MDU).82 11.6.2.5 Frame sequencing and addition of control and fill octets.83 11.6.2.6 Frame transmission.84 11.6.3 Unprotected service operation.85 SIST EN 300 175-4 V1.7.1:2003
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11.6.3.1 General.85 11.6.3.2 Data buffering and initial rate adaption.85 11.6.3.3 Multi-channel set multiplexing.85 11.6.3.4 Segmentation of MDUs.86 11.6.3.5 Frame transmission.87 11.7 LU6 Secondary Rate AdapTion (SRAT) service.87 11.7.1 General.87 11.8 LU16 ESCape Service (ESC).88 11.8.1 General.88 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.89 11.9.4 DLC layer service.89 11.9.4.1 Architectural model.89 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.91 11.9.4.2.1.1 Format control parameter coding.92 11.9.4.2.1.2 Offset variable V(O).92 11.9.4.2.1.3 Time variables Vn(T).92 11.9.4.2.1.4 Offset number N(O).92 11.9.4.2.1.5 Send state variable V(S).93 11.9.4.2.1.6 Acknowledge state variable V(A).93 11.9.4.2.1.7 Send sequence number N(S).93 11.9.4.2.1.8 Receive state variable V(R).93 11.9.4.2.1.9 Receive sequence number N(R).93 11.9.4.2.2 Information field.93 11.9.4.2.3 ARQ checksum.94 11.9.4.3 Procedures for normal operation.94 11.9.4.3.1 Establishment and synchronization procedures.94 11.9.4.3.2 Active phase.96 11.9.4.3.2.1 Transmitting frames (first time transmission).96 11.9.4.3.2.2 Re-transmitting frames.97 11.9.4.3.2.3 Receiving frames.97 11.9.4.3.2.4 Sending acknowledgements.98 11.9.4.3.2.5 Receiving acknowledgements.98 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.98 11.9.4.4.3 Transmitting frames.98 11.9.4.4.4 Receiving frames.
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