SIST EN 300 175-4 V1.4.2:2003
(Main)Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) Layer
- Abstract
To update ETS 300 175 Edition 2 based upon change requests received.
- 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 V1.4.2:2003 is the SIST adoption of ETSI EN 300 175-4 V1.4.2 for Digital Enhanced Cordless Telecommunications (DECT), Common Interface, Part 4. It specifies the Data Link Control (DLC) layer for DECT, including how C-plane signalling and U-plane traffic are framed, acknowledged, routed and managed. The standard is for designers, implementers and testers of DECT Fixed radio Termination (FT), Portable radio Termination (PT), and interworking equipment.
What does SIST EN 300 175-4 V1.4.2:2003 specify?
SIST EN 300 175-4 V1.4.2:2003 specifies the DECT DLC layer and the procedures above and below it on the common interface. Its focus is the link behaviour that makes FT and PT communication work in practice: service classes, frame coding, link establishment, retransmission, broadcast handling, management and U-plane service mapping.
The document is organized into clauses covering definitions, the DLC overview, C-plane service characteristics, frame structures, field coding, primitives, peer-to-peer procedures, management procedures, and U-plane service characteristics. That structure matters because it shows the standard moves from basic terminology to concrete protocol behaviour and then to the service interfaces used by higher layers and management entities.
What are the key requirements of SIST EN 300 175-4 V1.4.2:2003?
SIST EN 300 175-4 V1.4.2:2003 defines three C-plane data link classes: class U, class A and class B. Class U is unacknowledged, class A is acknowledged single-frame operation, and class B is acknowledged multiple-frame operation. In practice, this tells an implementer which link behaviour to support for signalling, and whether retransmission and flow control are required.
The standard requires each LAPC instance to use one class of operation, with class B needing an assigned Data Link Identifier (DLI) and additional establishment, maintenance and release procedures. It also defines LAPC states such as ULI, ALI and ASM. This matters because link identity must remain stable across bearer or connection handovers, and class B can be suspended and resumed.
For C-plane frames, the standard defines a type FA frame with address, control, length indicator, optional extended length indicator, information, fill and checksum fields. It also distinguishes CF and CS logical channels, which have different fragment sizes and frame-length alignment rules. In practice, this affects buffer sizing, fragmentation and how the MAC layer and DLC layer share the frame boundary.
The frame coding rules define the address field, control field, length indicator and checksum behaviour. Important identifiers include SAPI, LLN and DLI, and the control field uses I, S and U formats with the Poll/Final (P/F) bit. For engineering work, this is the part that determines how a receiver identifies the link, interprets commands and checks whether a frame is valid.
The standard gives detailed peer-to-peer procedures for class A and class B operation, including link setup, acknowledgement, retransmission, release, suspension, resumption and exception handling. It also defines when frames are accepted, discarded, or retransmitted, and how sequence variables such as V(S), V(A) and V(R) are used. That is the practical core of interoperability: both sides must manage state the same way.
It also defines the service primitives between the DLC layer and higher layers or the Interworking Unit (IWU). 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. This matters to protocol software because these are the interface points between the standard and an implementation’s internal software layers.
The U-plane part covers several service types, including TRUP, FREL, FSWI, FEC, BRAT, SRAT, ESC and a 64 kbit/s data bearer service. In practice, this section tells implementers how user data is carried, protected, segmented, switched or rate-adapted depending on the service instance.
What terms does SIST EN 300 175-4 V1.4.2:2003 define?
- DECT - Digital Enhanced Cordless Telecommunications, the cordless telecommunications system covered by the standard.
- FT - Fixed radio Termination, the fixed side of the DECT radio link.
- PT - Portable radio Termination, the portable side of the DECT radio link.
- DLC - Data Link Control, the layer that handles framing, acknowledgement and link management.
- LAPC - Link Access Procedure for the C-plane, the protocol entity that manages C-plane data links.
- Lc - the lower DLC entity that handles delimiting, checksum and routing to logical channels.
- LLME - Lower Layer Management Entity, which coordinates DLC processes and MAC connection control.
- SAPI - Service Access Point Identifier, the field that identifies the higher-layer service associated with a frame.
Who uses SIST EN 300 175-4 V1.4.2:2003?
SIST EN 300 175-4 V1.4.2:2003 is used by DECT equipment designers, protocol engineers, firmware developers and interoperability test labs. It is also relevant to quality managers and buyers who need to confirm that a product implements the expected DECT DLC behaviour for signalling and data traffic. In practice, it is used when designing, verifying or comparing FT, PT and IWU implementations.
What changed in SIST EN 300 175-4 V1.4.2:2003 from the previous edition?
SIST EN 300 175-4 V1.4.2:2003 updates ETS 300 175 Edition 2 based on change requests received.
Which standards are used with SIST EN 300 175-4 V1.4.2:2003?
- EN 300 175-2 - provides the physical-layer timing and fragment alignment used by DLC framing.
- EN 300 175-3 - defines the MAC layer transmission order and MAC-side primitives referenced by DLC.
- EN 300 175-5 - defines the mapping of higher-layer information for broadcast service messages.
- ITU-T Recommendation Q.921 - is referenced for link-layer concepts such as the extended address bit and related procedure heritage.
- ISO/IEC 8073 - provides the basis for the underlying checksum approach used in the checksum field.
What does the SIST EN 300 175-4 V1.4.2:2003 document contain?
The document contains coding rules, frame formats, state machines, service primitives and management procedures for DECT DLC. It includes figures for the FA frame, broadcast frame formats, control field formats, length indicator formats, checksum format and the U-plane model. It also includes tables for LLN values, command and response codes, primitive parameter presence, and channel-specific frame parameters.
For implementation work, the most useful parts are the procedures for class A and class B link establishment, retransmission and release, plus the tables that show how each primitive is parameterized. For testing, the document gives the exact frame and field structures needed to verify interoperability and link behaviour.
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Frequently Asked Questions
SIST EN 300 175-4 V1.4.2:2003 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: To update ETS 300 175 Edition 2 based upon change requests received.
To update ETS 300 175 Edition 2 based upon change requests received.
SIST EN 300 175-4 V1.4.2:2003 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 V1.4.2:2003 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 1.4.2SIST EN 300 175-4 V1.4.2:2003en01-december-2003SIST EN 300 175-4 V1.4.2:2003SLOVENSKI
STANDARD
EN 300 175-4 V1.4.2 (1999-06)European Standard (Telecommunications series)Digital Enhanced Cordless Telecommunications (DECT);Common Interface (CI);Part 4: Data Link Control (DLC) layerSIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)2ReferenceREN/DECT-000129-4 (1md00jdc.PDF)KeywordsDECT, radioETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frIndividual copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: editor@etsi.frCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999.All rights reserved.SIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)3ContentsIntellectual Property Rights.11Foreword.111Scope.122References.123Definitions and abbreviations.133.1Definitions.133.2Abbreviations.144Data Link Control (DLC) layer overview.164.1General.164.2C-Plane services.164.3U-plane services.174.4Lower Layer Management Entity (LLME).195C-plane service characteristics.195.1Data link service (LAPC+Lc).195.1.1General.195.1.2LAPC types of operation.205.1.3Establishment of information transfer modes.205.1.3.1Data Link Identifier (DLI).205.1.3.2LAPC states.205.2Broadcast service (Lb).216Frame structures for C-plane services.226.1Data link service frame structure.226.1.1General frame structure.226.1.2Lc frame delimiting and transparency.236.1.3Transmission order.236.1.4Routing to logical channels.236.1.4.1CF logical channel.246.1.4.2CS logical channel.246.1.5Invalid frames.256.2Broadcast service frame structure.256.2.1Standard frame structure.256.2.2Extended frame structure.267Elements of procedures and formats of fields for C-plane peer-to-peer communication.267.1General.267.2Address field formats.267.3Address field parameters.277.3.1REServed bit (RES).277.3.2Command Response (C/R) bit.277.3.3SAPI field.277.3.4New Link Flag (NLF) bit.277.3.5LLN-field.277.3.6Data Link Identifiers (DLI).287.4Control field formats.287.5Control field parameters.287.5.1Poll/Final (P/F) bit.287.5.2Multiple frame operation variables and sequence numbers.297.5.2.1Modulus.297.5.2.2Send state Variable V(S).297.5.2.3Acknowledge state Variable V(A).297.5.2.4Send sequence Number N(S).297.5.2.5Receive state Variable V(R).297.5.2.6Receive sequence Number N(R).30SIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)47.5.3Unacknowledged operation variables and sequence numbers.307.5.4Supervisory and Unnumbered function bits S and U.307.6Length indicator field format.307.7Length indicator field parameters.307.7.1Length indicator field extension bit; N.307.7.2More data bit; M.307.7.3Length parameter; LI.317.7.4Extended length parameter; LJJ.317.7.5Reserved bit; RES.327.8Fill field format.327.9Checksum field format.327.10Checksum field parameters.327.11Commands and responses.337.11.1Information (I) command.347.11.2Receive Ready (RR) command/response.347.11.3Receive Not Ready (RNR) command/response.347.11.4REJect (REJ) command/response.347.11.5Set Asynchronous Balanced Mode (SABM) command.347.11.6Disconnect Mode (DM) response.357.11.7Unnumbered Information (UI) command.357.11.8DISConnect (DISC) command.357.11.9Unnumbered ACK (UA) response.358Primitives.368.1Primitive types.368.2Primitives to the MAC layer (lower layer).368.3Primitives to the NWK layer (higher layer).368.3.1Parameter definitions.368.3.2 S-SAP primitives.378.3.2.1DL_ESTABLISH primitive.388.3.2.2DL_RELEASE primitive.388.3.2.3DL_DATA primitive.388.3.2.4DL_UNIT_DATA primitive.388.3.2.5DL_SUSPEND primitive.398.3.2.6DL_RESUME primitive.398.3.2.7DL_ENC_KEY primitive.398.3.2.8DL_ENCRYPT primitive.398.3.2.9DL_SERVICE_MOD primitive.408.3.3B-SAP primitives.408.3.3.1DL_BROADCAST primitive.408.3.3.2DL_EXPEDITED primitive.408.4Primitives to the interworking unit.408.4.1Parameter definitions.418.4.2LUX-SAP primitives.418.4.2.1DL_U_DATA primitive.418.4.2.2DL_U_UNIT_DATA primitive.418.4.2.3DL_U_ERROR primitive.429C-plane peer-to-peer procedures.429.1General.429.2Point to point acknowledged operation.439.2.1Procedure for the use of the P/F bit.439.2.1.1Class A acknowledged information transfer.439.2.1.2Class B acknowledged information transfer.439.2.2Use of LLN.439.2.2.1Class A operation.439.2.2.2Class B operation.439.2.3Link establishment and information transfer in class A operation.439.2.3.1Establishing class A operation.439.2.3.2Class A acknowledged information transfer.449.2.3.3Transmission of class A I-frames.44SIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)59.2.3.4Reception of class A I-frames.459.2.3.5Receiving acknowledgements.459.2.3.6Waiting for acknowledgement.459.2.3.7Release of class A operation.469.2.3.8Re-establishment of class A operation.469.2.4Establishing class B multiple frame operation.469.2.4.1Overview.469.2.4.2Class B multiple frame establishment procedures.479.2.4.3Class B LLN assignment procedures.489.2.4.3.1PT establishment.489.2.4.3.2FT establishment.499.2.5Link maintenance and information transfer in class B multiple frame operation.499.2.5.1Transmitting I-frames.499.2.5.2Receiving I-frames.509.2.5.2.1P bit set to 1.509.2.5.2.2P bit set to 0.509.2.5.3Sending and receiving acknowledgements.509.2.5.3.1Sending acknowledgements.509.2.5.3.2Receiving acknowledgements.509.2.5.4Receiving REJ-frames.519.2.5.5Receiving RNR-frames.529.2.5.6LAPC own receiver busy condition.539.2.5.7Waiting acknowledgement.539.2.5.8Appropriate supervisory frame.549.2.6Release of class B multiple frame operation.549.2.7Link suspension and resumption.559.2.7.1Link suspension.559.2.7.1.1Class B acknowledged suspend.559.2.7.1.2Unacknowledged suspend.569.2.7.2Class B link resumption.569.2.7.3Connection handover.579.2.7.3.1Class A connection handover.599.2.7.3.2Class B connection handover.599.2.7.3.3Expiry of connection handover timer.609.2.8Re-establishment of class B multiframe operation.609.2.8.1Criteria for re-establishment.609.2.8.2Procedure.609.2.9Exception handling.619.2.9.1General.619.2.9.2Class B exception condition reporting and recovery.619.2.9.2.1N(S) sequence error.619.2.9.2.2N(R) sequence error.629.2.9.2.3Timer recovery condition.629.2.9.2.4Collision of identical transmitted and received commands.629.3Unacknowledged operation.629.3.1Use of LLN for unacknowledged information transfer.629.3.2Class U link establishment.629.3.3Unacknowledged information transfer.639.3.3.1Transmission of unacknowledged information.639.3.3.2Reception of unacknowledged information.639.3.4Unacknowledged release.639.4Broadcast operation.639.4.1Normal operation.639.4.1.1Procedure in the Fixed radio Termination (FT).639.4.1.2Procedure in the Portable radio Termination (PT).639.4.2Expedited operation.649.4.2.1Procedure in the Fixed radio Termination (FT).649.4.2.2Procedure in the Portable radio Termination (PT).649.5MAC layer interfaces.649.5.1MC-SAP.64SIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)69.5.1.1C-plane overview.649.5.1.2C-plane service data procedures.659.5.1.3U-plane service data.659.5.2MB-SAP.659.5.2.1C-plane overview.659.5.2.2C-plane service data procedures.669.5.2.3U-plane service data.669.5.3MA-SAP.669.5.3.1Overview.669.5.3.2Service data procedures.6610Management procedures.6710.1Lower Layer Management Entity (LLME).6710.2MAC connection management.6710.2.1MAC connection set-up.6710.2.2MAC connection release.6810.2.3MAC connection modification.6810.2.4MAC connection identifiers.6810.2.4.1Overview.6810.2.4.2Advanced MAC Connection Identifiers (AMCI).6910.2.4.3Basic MAC Connection Identifiers (BMCI).6910.2.4.4MAC Connection Endpoint Identifier (MCEI).7010.2.5Selection of logical channel (CS or CF).7010.3DLC C-plane (LAPC) management.7010.3.1Provision of link signature.7010.3.2Routing of connection oriented links.7110.3.3Routing of connectionless links.7110.4DLC U-plane (LUX) management.7110.4.1U-plane establishment.7110.4.2U-plane release.7210.4.3U-plane suspend and resume.7210.5Connection handover management.7210.6Ciphering management.7310.6.1Ciphering management in cases where the NWK layer executes the ciphering related MM procedure.7310.6.1.1Providing a key to the MAC layer.7310.6.1.2Starting and stopping the ciphering.7310.6.1.3Connection handover.7310.6.2Ciphering management in cases where the NWK layer does not execute the ciphering related MMprocedure.7311U-plane service characteristics.7411.1General.7411.2LU1 TRansparent UnProtected service (TRUP).7411.3LU2 Frame RELay service (FREL).7511.3.1General.7511.3.2Checksum operation.7611.3.3Segmentation and transmission class.7611.3.4Data transmission.7711.3.4.1Send side procedure.7711.3.4.2Receive side procedure.7711.4LU3 Frame SWItching service (FSWI).7711.5LU4 Forward Error Correction service (FEC).7811.6LU5 Basic Rate Adaption service (BRAT).7811.6.1Overview.7811.6.2Protected service operation.7911.6.2.1General.7911.6.2.2Data buffering and initial rate adaption.8011.6.2.3Multi-channel set multiplexing.8111.6.2.4Segmentation of Multiplexed Data Units (MDU).8211.6.2.5Frame sequencing and addition of control and fill octets.8211.6.2.6Frame transmission.83SIST EN 300 175-4 V1.4.2:2003
ETSIETSI EN 300 175-4 V1.4.2 (1999-06)711.6.3Unprotected service operation.8411.6.3.1General.8411.6.3.2Data buffering and initial rate adaption.8511.6.3.3Multi-channel set multiplexing.8511.6.3.4Segmentation of MDUs.8611.6.3.5Frame transmission.8611.7LU6 Secondary Rate AdapTion (SRAT) service.8611.7.1General.8611.8LU16 ESCape Service (ESC).8811.8.1General.8811.9LU7 64 kbit/s data bearer service.8811.9.1General.8811.9.2Physical layer service.8811.9.3MAC layer service.8811.9.4DLC layer service.8811.9.4.1Architectural model.8811.9.4.1.1Transmit (Tx) frame buffering.8911.9.4.1.2Receive (Rx) frame buffering.8911.9.4.2Automatic-Repeat-Request (ARQ) and Forward Error Control (FEC).8911.9.4.2.1Control field.9111.9.4.2.1.1Format control parameter coding.9111.9.4.2.1.2Offset variable V(O).9111.9.4.2.1.3Time variables Vn(T).9111.9.4.2.1.4Offset number N(O).9211.9.4.2.1.5Send state variable V(S).9211.9.4.2.1.6Acknowledge state variable V(A).9211.9.4.2.1.7Send sequence number N(S).9211.9.4.2.1.8Receive state variable V(R).9211.9.4.2.1.9Receive sequence number N(R).9211.9.4.2.2Information field.9311.9.4.2.3ARQ checksum.9311.9.4.3Procedures for normal operation.9311.9.4.3.1Establishment and synchronization procedures.9311.9.4.3.2Active phase.9511.9.4.3.2.1Transmitting frames (first time transmission).9511.9.4.3.2.2Re-transmitting frames.9511.9.4.3.2.3Receiving frames.9611.9.4.3.2.4Sending acknowledgements.9611.9.4.3.2.5Receiving acknowledgements.9711.9.4.3.3Release.9711.9.4.4Exceptional procedures.9711.9.4.4.1Invalid frame condition.9711.9.4.4.2Establishment.9711.9.4.4.3Transmitting frames.9711.9.4.4.4Receiving frames.9711.9.4.4.5Sending acknowledgements.9711.9.4.4.6Forwarding of received data.9711.9.4.4.7N(R) sequence error.9811.9.4.4.8N(O) sequence error.9811.9.4.4.9N(S) sequence error.9811.9.4.4.10Format error.9811.9.4.4.11Abnormal release.9911.9.4.4.12Implicit reset.9911.9.5Network layer service.9911.9.5.1LCE service.9911.9.5.2CC service.9911.10LU8 service.
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