ETSI I-ETS 300 230 ed.1 (1993-10)
Radio Equipment and Systems (RES); Land mobile service; Binary Interchange of Information and Signalling (BIIS) at 1 200 bit/s (BIIS 1 200)
Radio Equipment and Systems (RES); Land mobile service; Binary Interchange of Information and Signalling (BIIS) at 1 200 bit/s (BIIS 1 200)
DI/RES-02-08
Radijska oprema in sistemi (RES) – Storitev kopenskih mobilnih komunikacij – Izmenjava binarnih podatkov in signalizacija (BIIS) s hitrostjo 1200 bit/s (BIIS 1 200)
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radijska oprema in sistemi (RES) – Storitev kopenskih mobilnih komunikacij – Izmenjava binarnih podatkov in signalizacija (BIIS) s hitrostjo 1200 bit/s (BIIS 1 200)Radio Equipment and Systems (RES); Land mobile service; Binary Interchange of Information and Signalling (BIIS) at 1 200 bit/s (BIIS 1 200)33.070.01Mobilni servisi na splošnoMobile services in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:I-ETS 300 230 Edition 1SIST I-ETS 300 230 E1:2003en01-december-2003SIST I-ETS 300 230 E1:2003SLOVENSKI
STANDARD
INTERIMEUROPEANI-ETS 300 230TELECOMMUNICATIONOctober 1993STANDARDSource: ETSI TC-RESReference: DI/RES-2-08ICS:33.060.20, 33.060.30Key words:Land mobile service, BIISRadio Equipment and Systems (RES);Land mobile serviceBinary Interchange of Information and Signalling (BIIS)at 1 200 bit/s(BIIS 1 200)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 92 94 42 00 - Fax: +33 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1993. All rights reserved.SIST I-ETS 300 230 E1:2003
Page 2I-ETS 300 230: October 1993Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST I-ETS 300 230 E1:2003
Page 3I-ETS 300 230: October 1993ContentsForeword.91Scope.112Normative references.113Definitions, symbols and abbreviations.123.1Definitions.123.2Symbols.133.3Abbreviations.144System architecture.154.1General network configuration.154.2Addressing.154.3Usage of repeaters.165Basic system definitions.165.1Modulation method.165.1.1Subcarrier modulation.165.1.2Frequency deviation.165.2Transmission format.175.3Link establishment time.175.4Bit synchronisation.175.5Block synchronisation.175.5.1Normal block synchronisation.175.5.2Optional bit and block synchronisation.185.6Codewords.185.6.1Redundancy.185.6.2Optional data protection for error correction.195.7Hang-over bit.205.8Signalling cycle.206Services and facilities.216.1Selective calls.216.1.1Individual call.216.1.2Group call.216.1.3Broadcast call.226.2Call priority levels.226.2.1Normal call.226.2.2Priority call.226.2.3Emergency call.226.3Call management.226.3.1Acknowledgements.226.3.1.1Automatic acknowledgement.226.3.1.2Emergency acknowledgement.226.3.1.3Informative acknowledgements.226.3.1.4Invalid call acknowledgement.226.3.2Manual response.236.3.3Call cancellation.236.3.4Emergency reset.236.3.5Repeater access.236.4Telephone access.236.4.1PABX access.236.4.2PSTN access.23SIST I-ETS 300 230 E1:2003
Page 4I-ETS 300 230: October 19936.5Special functions.236.5.1Request to call back.236.5.2Channel control.236.5.3Mobile enable/disable.236.5.4Status transmission.246.5.5Data transmission.246.5.6System control.246.6Identification.247Codeword and block definition.247.1Address block.247.1.1General.247.1.2Concatenated codewords.257.1.3Normal address mode.257.1.4External address mode.257.2Operating mode characteristic.267.2.1Category definitions.267.2.2System functions.267.2.2.1Emergency reset.277.2.2.2Cancel.277.2.2.3Clear down.277.2.2.4Maintenance Identification.277.2.2.5Transmitter key on.277.2.2.6Transmitter key off.277.2.2.7Repeater on.277.2.2.8Repeater off.277.2.3Call messages.277.2.3.1Emergency radio call.287.2.3.2Priority radio call.287.2.3.3Normal radio call.287.2.3.4Telephone call.287.2.3.5Broadcast radio call.297.2.3.6Request to call back.297.2.3.7Manual response.297.2.3.8External addressing.297.2.4Acknowledgements.297.2.4.1Emergency acknowledgement.307.2.4.2Repeat acknowledgement.307.2.4.3General acknowledgement.307.2.4.4Absent/unavailable acknowledgement.307.2.4.5Busy acknowledgement.307.2.4.6Call back acknowledgement.307.2.4.7Intermediate acknowledgement.307.2.4.8Reject acknowledgement.307.2.5Special functions.307.2.5.1System control.317.2.5.2Short data transfer.317.2.5.3Dialogue data transfer.327.2.5.4Change channel.327.2.5.5Vote now.327.2.5.6Status request.327.2.5.7Mobile enable.327.2.5.8Mobile disable.327.2.6Status transfer.327.2.7Reserved category.327.2.8Custom functions.328Message procedures.338.1Normal or priority radio call procedure.338.2Broadcast call procedure.34SIST I-ETS 300 230 E1:2003
Page 5I-ETS 300 230: October 19938.3Emergency call procedure.348.4Manual response procedure.358.5Call cancellation procedure.358.6Repeater access procedure.368.7Telephone call procedure.368.8Call back request procedure.378.9Change channel procedure.378.10Mobile enable and mobile disable procedure.378.11Status transfer procedure.388.12Short data transfer procedure.389Channel access protocol and occupation rules.399.1Channel access.399.2Retry procedure.409.3Reversion time.4010Data protocol.4010.1Dialogue protocol services and facilities.4110.1.1Acknowledged point-to-point information transfer.4110.1.2Acknowledged broadcast information transfer.4110.1.3Unacknowledged information transfer.4110.2Data transmission structure.4110.3Elements of the control block.4210.3.1Data terminal sub-address, ADR.4210.3.2Command/Response bit, C/R.4310.3.3Control field, CONT.4310.3.3.1Sequence numbers, N(R) and N(S).4310.3.3.2Poll and final bit, P/F.4410.3.3.3Supervisory and modifier function bits, S and M.4410.3.4PARAMETER field.4410.4I-frames.4410.5S-frames.4510.5.1Receive Ready (RR) command/response.4510.5.2Receive Not Ready (RNR) command/response.4610.5.3Reject (REJ) command/response.4610.5.4Selective reject (SREJ) command/response.4610.6U-frames.4710.6.1Set Asynchronous Balanced Mode (SABM) command.4710.6.2Disconnect (DISC) command.4710.6.3Un-numbered Acknowledgement (UA) response.4810.6.4Frame reject (FRMR) response.4810.6.5Disconnected Mode (DM) response.4910.6.6Un-numbered Information (UI) command.4910.6.7Set Group Mode (SGM) command.4910.7Data compression.5011Definition of the data transfer protocol.5111.1Data link set-up phase.5111.1.1Point-to-point link set-up.5111.1.2Group link set-up.5111.2Data transfer phase.5211.2.1Transmission of I-frames.5211.2.1.1Transmission of I-frames on a point-to-point connection.5211.2.1.2Transmission of I-frames on a group connection.5211.2.2Reception confirmation.5211.2.2.1Point-to-point reception confirmation.5211.2.2.2Group reception confirmation.5311.2.3Checkpointing.5311.2.4Recovery by time control.5311.2.4.1Point-to-point time control.53SIST I-ETS 300 230 E1:2003
Page 6I-ETS 300 230: October 199311.2.4.2Group time control.5311.2.5Reception of I-frames.5411.2.5.1Ready-to-receive state.5411.2.5.2Not-ready-to-receive state.5411.3Resetting phase.5411.4Transfer termination phase.5411.4.1Point-to-point link termination.5411.4.2Group link termination.5512Channel access protocol and occupation rules for data transmission.5512.1Channel access for data transmission.5512.2Retry procedure.55Annex A (informative):Examples of channel access and occupation rules.57A.1Message duration.57A.2Successful transmission of a message.57A.3Unsuccessful transmission of a message and repetition.57A.4Channel access with time intervals.58A.5Channel access for data transmission with time intervals.58Annex B (normative):Values of system parameters.59Annex C (normative):The Radix 40 data compression method.60Annex D (informative):System-terminal interface.63D.1Interface for data terminal equipment.63D.2Procedure for the system-terminal interface.63D.2.1Asynchronous procedure 1 (CR/LF).64D.2.2Asynchronous procedure 2 (STX/ETX).64D.2.3Synchronous procedure 1 (STX/ETX).64D.2.4Synchronous procedure 2 (HDLC).64Annex E (normative):Hexadecimal digit coding.65Annex F (normative):Country code.66Annex G (normative):OMC coding.67Annex H (informative):Examples for the data dialogue procedure.68H.1Test algorithm for the validity of N(R).68H.2State transition table of the data dialogue procedure.68H.2.1State table for miscellaneous inputs.69H.2.2State table for commands received.70H.2.3State table for responses received.71Annex J (informative):Verification of the integrity of the I-frames.73Annex K (informative):Using forward error correction.74Annex L (informative):Examples of using the COM field.76SIST I-ETS 300 230 E1:2003
Page 7I-ETS 300 230: October 1993Annex M (informative):Bibliography.77History.78SIST I-ETS 300 230 E1:2003
Page 8I-ETS 300 230: October 1993Blank pageSIST I-ETS 300 230 E1:2003
Page 9I-ETS 300 230: October 1993ForewordThis Interim European Telecommunication Standard (I-ETS) has been prepared by the Radio Equipmentand Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI),and having passed through the Voting phase of the ETSI standards approval procedure is now published.The binary signalling procedure described in this I-ETS is an alternative to existing calling systems such assingle-tone, multitone, subaudio and double-tone.Every I-ETS and ETS prepared by ETSI is a voluntary standard. This I-ETS contains text concerningconformance testing of the equipment to which it relates. This text should be considered as guidance onlyand does not make this I-ETS mandatory.Table F.1 in Annex F (normative) may be subject to the ETSI ammendment procedure after considerationof a Vote comment submitted during the ETSI standards approval procedure.SIST I-ETS 300 230 E1:2003
Page 10I-ETS 300 230: October 1993Blank pageSIST I-ETS 300 230 E1:2003
Page 11I-ETS 300 230: October 19931ScopeThis Interim European Telecommunication Standard (I-ETS) describes a binary signalling and datatransmission system for private radio equipment operating at 1 200 bit/s using indirect modulation.This I-ETS applies to systems operating on either shared, or exclusive, channels.According to national regulations of various countries, Public Switched Telephone Network (PSTN) accessand data transmission may be subject to licensing. The channel access protocol and occupation rules canalso be a matter for licensing, depending on the different national regulations.This I-ETS may be implemented only in parts. Where parts, or options, of this I-ETS are implemented, therequirements of this I-ETS shall be met. Conversely the bits specified in this I-ETS for options which arenot implemented, shall not be used for any other purposes.Fields that have been reserved to provide for future extensions to this I-ETS shall not be used. Finally,fields have been defined as free for custom specific applications and are not further defined in this I-ETS.This I-ETS permits the addition, if necessary, of supplementary signalling, either sub-audio, multitone, orbinary, as appropriate, to permit primary and secondary paging to be used. This I-ETS does not attemptto define the protocols necessary for such supplementary signalling.Where parameters relating to the radio environment are specified, reference should be made to theappropriate Clauses of I-ETS 300 113 [3]. However, selective calls according to this I-ETS can beimplemented in equipment fulfilling I-ETS 300 219 [2] (that is messages of categories 0, 2, 4, 5 andmessages of category 1 and functions 0, 1 and 2 as defined in subclause 7.2 of this I-ETS).2Normative referencesThis I-ETS incorporates by dated or undated reference, provisions from other publications. Thesenormative references are quoted at the appropriate places in the text and the publications are listedhereafter. For dated references subsequent amendments to or revisions of any of these publications applyto this I-ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ISO 4335 (Third edition: 1987): "Information processing systems - Datacommunication - High-level data link control elements of procedures".[2]prI-ETS 300 219: "Radio Equipment and Systems (RES); Land Mobile Service;Technical characteristics and test conditions for radio equipment, transmittingsignals to initiate a specific response in the receiver".[3]I-ETS 300 113: "Radio Equipment and Systems (RES) Land mobile service;Technical characteristics and test conditions for non-speech and combinedanalogue speech/non-speech equipment with an internal and external antennaconnector, intended for the transmission of data".[4]CCITT Recommendation T.50: "International Alphabet No. 5".[5]ISO 3309 (1991): "Information technology - Telecommunications and informationexchange between systems - High-level data link control (HDLC) procedures -Frame structure".SIST I-ETS 300 230 E1:2003
Page 12I-ETS 300 230: October 19933Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of this I-ETS, the following definitions apply:Address: information which consists of a country code, a common address part, and an individual numberor a group number.Address block: a block containing addresses. The first block of a transmission is always an addressblock. It can be followed by other address blocks.Address codeword: a 64-bit codeword. The first 48 bits contain the information, the remaining 16 bitscontain the redundancy for the data protection. The first codeword of a transmission is always an addresscodeword that can be followed by others. The transmitter address, the receiver address and the functionof the message are transmitted in the address codeword.Block: the smallest quantity of information that will be exchanged over the radio channels according to thisI-ETS. It can correspond to the transmission of either a "codeword" or an "encoded codeword".Call or connection set-up: a complete information exchange between two or more stations, including thetransmission of one or more messages.Codeword: a word correctly coded according to this I-ETS. It contains 48 bits of information. These bitsare protected by 16 bits of redundancy, producing a total of 64 bits.Common address: a common part for an individual transmitter and individual receiver address.Data block: a block intended for the transmission of information. The data blocks can only follow addressblocks in a transmission.Data codeword: a 64-bit codeword. The first 48 bits contain the information, the remaining 16 bits containthe redundancy for the data protection. The data codewords follows the address codewords. Datacodewords are assigned to the transmission of any information.Encoded codeword: the 64 bits of a codeword can optionally be encoded with the convolutional code,producing a total of 128 bits.External addressing: the individual transmitter and receiver address are binary coded within 12 bits usingthe normal addressing mode. The complete transmitter address with its individual and common part islocated in the first address codeword. The complete receiver address with its individual and common partis located in the second address codeword.Group address: an address shared by several stations. The group number can be any number within thenormal addressing capacity of 12 bits. The group numbers are user specific.I-frame: see subclause 10.4.Individual address: the address of a station, which is unique within the network. Each station has anindividual address.Message: the contiguous transmission of a codeword sequence consisting of an address codeword whichmay be followed by other address codewords and by one or several data codewords.Normal addressing: the individual transmitter and
receiver address are binary coded within 12 bits andcompletely located in the address codeword not being followed by other address codewords.Reserved: fields within codewords which are intended for a future designation. Reserved fields areintended for the values specified in the protocol.SIST I-ETS 300 230 E1:2003
Page 13I-ETS 300 230: October 1993Selective address: see individual address.S-frame: see subclause 10.5.Signalling cycle: a sequence of several messages having the same function which are separated by bitand block synchronisation.Sub-address: the individual address of a terminal equipment if a station has connections to more than oneterminal. This is defined for data transmission only.Telephone call: the entire telephone number is transmitted within concatenated codewords.Transmission: the information transmitted in between the "power on" and "power off" period of aparticular transmitter, which may include blocks and/or speech.U-frame: see subclause 10.6.3.2SymbolsFor the purposes of this I-ETS, the following symbols apply:dTTThe maximum time during which an acknowledgement or reply may be sent afterexpiry of TT.HHexadecimal notation, e.g. 2AH is equal to 42 decimal.KThe maximum number of unacknowledged sequentially numbered I-frames at aspecific time.N1The highest number of data blocks which may be transmitted within an I-frame.N2The maximum number of retransmissions of an I-frame after the expiry of thetime control T1.NAThe number of acknowledgement repetitions within a signalling cycle.NDThe maximum number of data blocks used for short data transfer.NMThe number of message repetitions within a signalling cycle.NRThe maximum number of retrys of a message if an acknowledgement is notreceived.T1FThe fixed part of the retry waiting time T1 after whose expiry a repetition of aframe is initiated.T1IThe increment part of the retry waiting time T1 after whose expiry a repetition ofa frame is initiated.T3The time after which a receiving station automatically exits the group mode.TACThe time waiting for an acknowledgement after whose expiry a repetition of themessage is initiated.TADThe time waiting for a response after whose expiry a repetition of a frame isinitiated.TCThe maximum waiting time to access a channel.TFThe time after which a call is cleared if an Radio Frequency (RF) carrier is lost.SIST I-ETS 300 230 E1:2003
Page 14I-ETS 300 230: October 1993TIThe time following an intermediate acknowledgement after which furthersignalling is expected.TOFThe fixed part of the observation time TO after whose expiry the channel may beoccupied.TOIThe increment part of the observation time TO after whose expiry the channelmay be occupied.TRVThe maximum time between the last bit of a message and keying of thetransmitter by the answering station.TS1The transmit state time within an emergency cycle.TS2The receive state time within an emergency cycle.TS3The idle state time within an emergency cycle.TTThe maximum transmission time during which a station may access the channelfor ongoing data packet transmissions.TVThe maximum duration time of a call after which the call is automatically cleared.TWFThe fixed part of the retry waiting time TW after whose expiry a repetition of themessage is initiated.TWIThe increment part of the retry waiting time TW after whose expiry a repetitionof the message is initiated.3.3AbbreviationsFor the purposes of this I-ETS, the following abbreviations apply:ADMAsynchronous Disconnected ModeABMAsynchronous Balanced ModeBSBase StationCCITT(The) International Telegraph and Telephone Consultative CommitteeDTEData Terminal EquipmentFCSFrame Check SequenceFECForward Error CorrectionGMGroup ModeHDLCHigh-level Data Link ControlIA5International Alphabet No. 5 [4]LETLink Establishment TimeLSBLeast Significant BitMSMobile StationMSBMost Significant BitSIST I-ETS 300 230 E1:2003
Page 15I-ETS 300 230: October 1993PABXPrivate Automatic Branch eXchangePSTNPublic Switched Telephone NetworkRFRadio FrequencyRXReceiverTETerminal EquipmentTXTransmitter4System architecture4.1General network configurationOne example of the network configuration
is represented in figure 1, but other configurations are possible.For this example the network contains four main interfaces. The Man-Machine Interface (MMI), theTerminal-Mobile Interface (TE/MS), and the System-Terminal Interface (SC/TE) are specified by thesystem designer. In this I-ETS, only the Air Interface (AI) will be defined. The recommended System-Terminal Interface (SC/TE) is outlined in Annex D. The information to be transmitted is transferred to theconnected terminals or gateways for processing.ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³ ³
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Page 16I-ETS 300 230: October 1993These addresses include individual addresses, group call addresses and common addresses to all units ofa network.Where several data terminals are connected to the same station, sub-addresses may be used.When gateways are used, additional information is needed to identify destination terminals.4.3Usage of repeatersSystems implemented according to this I-ETS may include repeaters. If repeaters are used, data can berepeated in one of the three following ways:-full transparency;-bit by bit regeneration;-message error correction and repetition of a transmission.Each repeater can be addressed using its individual address.5Basic system definitionsThis Clause describes the basic system definitions for the signalling and data transmission system.In the following figures, the transmitted bit stream is always shown with bit 1, the Most Significant Bit(MSB) transmitted first.Where data bytes or characters are transmitted, the MSB is also to be transmitted first. This differs frommost line applications where the Least Significant Bit (LSB) is sent first.5.1Modulation method5.1.1Subcarrier modulationThe binary data transmission is based on subcarrier modulation. Fast Frequency Shift Keying (FFSK) at 1200 bit/s is used. The transition between bits are made at the zero crossing points of the subcarrier. Themodulation parameters are represented in table 1:Table 1: Modulation parametersÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³ Transmission speed ³ 1 200 bit/s
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Page 17I-ETS 300 230: October 1993Table 2: Frequency deviationÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³Channel spacing³
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³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙFigure 2: Transmission format5.3Link establishment timeTransmissions shall be preceded by a Link Establishment Time (LET) within which a transmission,preferably unmodulated, at not less than 90 % of maximum power shall take place. The duration of theLET shall be defined on a system per system basis.5.4Bit synchronisationThe binary transmission is required to begin with a bit reversal 1010.10 so that the receiver datademodulator can be synchronized to the transmitted signal. The normal bit synchronisation (BITSYNC)consists of 16 bits and ends with a binary 0. An optional bit synchronisation is defined in subclause 5.5.2.5.5Block synchronisation5.5.1Normal block synchronisationThe block synchronisation (BLCSYNC) marks the beginning of the codeword framing. It consists of 16 bits.The bit pattern and the hexadecimal equivalent are represented in figure 3.SIST I-ETS 300 230 E1:2003
Page 18I-ETS 300 230: October 1993ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³Bit-no.
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ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙFigure 3: Block synchronisationIf the block synchronisation is not received correctly, the blocks that follow shall not be decoded.The autocorrelation properties of the BLCSYNC are calculated with respect to its correspondingBITSYNC.5.5.2Optional bit and block synchronisationIt is possible to protect all codewords with a Forward Error Correction (FEC). If the codewords areoverlaid by a FEC code this is indicated by the inverse bit and block synchronisation. The bitsynchronisation ends with a binary 1. The bit pattern and the hexadecimal equivalent of the inverse blocksynchronisation are represented in figure 4.ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³Bit-no.
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ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙFigure 4: Optional block synchronisationIf the block synchronisation is not received correctly, the blocks that follow shall not be decoded.The autocorrelation properties of the BLCSYNC are calculated with respect to its correspondingBITSYNC.5.6CodewordsThe codewords have a constant length of 64 bits. 48 bits contain the information and 16 bits contain theredundancy for the data protection. The structure is represented in figure 5.ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿³Bit-no. 1 .48 49.64 ³³
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I N F O R M A T I O N
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³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙFigure 5: Codeword structure5.6.1RedundancyThe redundancy comprises 16 bits and shall be used for error detection. Error corrections may also beperformed. The check bits are calculated in three steps:-the first 15 check bits originate from a (63,48) cyclic block code. The 48 information bits representthe coefficients of a polynomial. This polynomial is divided modulo 2 by the following generatingpolynomial:x15 + x14 + x13 + x11 + x4 + x2 + 1SIST I-ETS 300 230 E1:2003
Page 19I-ETS 300 230: October 1993The first 15 check bits correspond to the coefficients of the terms from x14 to x0 in the remainingpolynomial after the complete division;-the 15th check bit is then inverted;-finally, a parity bit is appended to the 63 bit block to provide an even parity of the complete 64bit block.The error control properties of the codewords, using a hard decision decoding, are the following:-detection of all odd number of errors, any random errors up to 5, and any error burst up to length16; or-correction of any single bit error and detection of any random errors up to 4, and any error burst upto length 11; or-correction of any two
errors and detection of any random errors up to 3, and any error burst up tolength 4; or-correction of any single error burst up to length 5.The higher the degree of applied error correction, the more li
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