SIST EN 300 175-2 V1.7.1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 2: Physical Layer (PHL)35.100.10Physical layer33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)ICS:Ta slovenski standard je istoveten z:EN 300 175-2 Version 1.7.1SIST EN 300 175-2 V1.7.1:2003en01-december-2003SIST EN 300 175-2 V1.7.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 2
Reference REN/DECT-000201-2 Keywords DECT, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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© European Telecommunications Standards Institute 2003. All rights reserved.
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 300 175-2 V1.7.1:2003

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Contents Intellectual Property Rights.7 Foreword.7 1 Scope.8 2 References.8 3 Definitions and abbreviations.9 3.1 Definitions.9 3.2 Abbreviations.10 4 PHL services.11 4.1 RF channels (access in frequency).12 4.1.1 Nominal position of RF carriers.12 4.1.2 Accuracy and stability of RF carriers.12 4.2 Time Division Multiple Access (TDMA) structure (access in time).13 4.2.1 Frame, full-slot, double-slot, and half-slot structure.13 4.2.2 Reference timer accuracy and stability.14 4.2.3 RFP transmission jitter.14 4.2.4 PP reference timer synchronization.14 4.2.5 System synchronization.15 4.2.6 Inter-system synchronization.15 4.2.7 Reference timer adjustment for synchronization.15 4.3 Cells (access in space).15 4.4 Physical packets.15 4.4.1 The short physical packet P00.16 4.4.2 The basic physical packet P32.16 4.4.3 The low capacity physical packet P08j.16 4.4.4 The high capacity physical packet P80.17 4.5 Physical channels.17 4.5.1 Ra (K, L, M, N) notation.17 4.5.2 The short physical channel R00 (K, L, M, N).18 4.5.3 The basic physical channel R32 (K, L, M, N).19 4.5.4 The low-rate physical channel R08j (K, L, M, N).19 4.5.5 The high capacity physical channel R80 (K, L, M, N).20 4.6 Synchronization field S.20 4.7 D-field.21 4.7.1 Physical packet P00.21 4.7.2 Physical packet P32.21 4.7.3 Physical packet P08j.21 4.7.4 Physical packet P80.21 4.8 Z-field.22 4.9 Bit pattern during ramping.22 5 Transmission of physical packets.22 5.1 Definitions.22 5.1.1 End of the physical packet.22 5.1.2 Transmitted power.22 5.1.3 Normal Transmitted Power (NTP).23 5.2 Transmission burst.23 5.2.1 Transmitter attack time.23 5.2.2 Transmitter release time.23 5.2.3 Minimum power.23 5.2.4 Maximum power.23 5.2.5 Maintenance of transmission after packet end.23 5.2.6 Transmitter idle power output.23 5.3 Transmitted power.24 5.3.1 Peak power per transceiver.24 SIST EN 300 175-2 V1.7.1:2003

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5.3.1.1 PP and RFP with an integral antenna.24 5.3.1.2 PP and RFP with external connections for all antennas.24 5.3.2 Maximum EIRP and number of transceivers.24 5.4 RF carrier modulation.24 5.4.1 Modulation method.24 5.4.2 Definition of "1" and "0".25 5.4.3 Deviation limits.25 5.5 Unwanted RF power radiation.25 5.5.1 Emissions due to modulation.25 5.5.2 Emissions due to transmitter transients.26 5.5.3 Emissions due to intermodulation.26 5.5.4 Spurious emissions when allocated a transmit channel.26 6 Reception of physical packets.27 6.1 Definitions and conditions for clause 6.27 6.1.1 Power levels and field strength.27 6.1.2 Test conditions.27 6.1.3 Reference DECT radio end point.27 6.2 Radio receiver sensitivity.27 6.3 Radio receiver reference bit error rate and frame error ratio.28 6.4 Radio receiver interference performance.28 6.5 Radio receiver blocking.28 6.5.1 Owing to signals occurring at the same time but on other frequencies.28 6.5.2 Owing to signals occurring at a different time.29 6.6 Receiver intermodulation performance.29 6.7 Spurious emissions when not allocated a transmit channel.29 6.7.1 Out of band.29 6.7.2 In the DECT band.29 7 Primitives between physical layer and other entities.29 7.1 Medium access control layer (D-SAP).30 7.1.1 PL_TX {req}.30 7.1.2 PL_RX {req, cfm}.30 7.1.3 PL_FREQ_ADJ {req}.31 7.2 Management entity (PM-SAP).31 7.2.1 PL_ME_SYNC {req, cfm}.31 7.2.2 PL_ME_SIG_STR {req, cfm}.31 7.2.3 PL_ME_TIME_ADJ {req, cfm}.31 8 PHL procedures.31 8.1 Addition of synchronization field and transmission.31 8.2 Packet reception and removal of synchronization field.32 8.3 Measurement of signal strength.32 8.4 Synchronization pulse detection.32 8.5 Timing adjustment.33 8.6 Frequency adjustment.33 9 Management entity procedures related to PHL.33 9.1 List of quietest physical channels.33 9.2 Physical channels with greatest field strength (PP only).33 9.3 Extract timing.33 Annex A (informative): RF exposure requirements.34 A.1 Recommendation.34 A.2 Compliance distances.34 Annex B (normative): Synchronization port.36 B.1 General requirements.36 B.2 Wired synchronization ports.36 B.2.1 Synchronization signal.37 SIST EN 300 175-2 V1.7.1:2003

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B.3 GPS synchronization.38 B.3.1 Synchronization signal.39 B.3.2 DECT timings derivation from the GPS time.39 B.3.2.1 DECT multiframe number synchronization using GPS.40 B.3.2.2 DECT PSCN synchronization using GPS.40 B.4 Guidance for installation.41 B.4.1 Interconnection cable.41 B.4.2 Propagation delay of synchronization signals.41 B.4.2.1 Calculation of Propagation delay (informative).41 B.4.2.2 Delay compensation.42 B.4.3 GPS receiver stability.42 Annex C (informative): Prolonged preamble.43 C.1 Bit pattern.43 C.2 The power-time template.43 Annex D (normative): 4-level/8-level/16-level/64-level modulation option.44 D.1 The /2-DBPSK modulation scheme.45 D.1.1 RF carrier modulation.45 D.1.1.1 Modulation accuracy.45 D.1.2 Transmission of physical packets.45 D.2 The /4-DQPSK modulation scheme.46 D.2.1 RF carrier modulation.46 D.2.1.1 Modulation accuracy.46 D.2.2 Transmission of physical packets.46 D.3 The /8-D8PSK modulation scheme.46 D.3.1 RF carrier modulation.46 D.3.1.1 Modulation accuracy.47 D.3.2 Transmission of physical packets.47 D.4 The 16 QAM modulation scheme.47 D.4.1 RF carrier modulation.47 D.4.1.1 Modulation accuracy.48 D.4.2 Transmission of physical packets.48 D.5 The 64 QAM modulation scheme.48 D.5.1 RF carrier modulation.48 D.5.1.1 Modulation accuracy.49 D.5.2 Transmission of physical packets.50 D.6 Transmission of physical packets.50 D.6.1 Error vector magnitude definition.50 D.6.2 EVM requirement.50 Annex E (normative): Power control procedures.51 E.1 Definitions of parameters and relations between parameters.52 E.2 Procedure for PP power adjustment due to movement.53 E.3 Setting the power control threshold, RSSpT.53 Annex F (normative): DECT carrier numbers and carrier positions in the range 1 880 MHz to 2 025 MHz and for the US market 902 MHz to 928 MHz and 2 400 MHz to 2 483,5 MHz.55 F.1 Introduction.55 F.2 1 880 MHz to 1 978 MHz and 2 010 MHz to 2 025 MHz RF band 00001.56 F.3 1 880 MHz to 1 925 MHz and 2 010 MHz to 2 025 MHz RF band 00010.57 SIST EN 300 175-2 V1.7.1:2003

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F.4 1 880 MHz to 1 900 MHz, 1 915 MHz to 1 940 MHz and 2 010 MHz to 2 025 MHz RF band 00011.58 F.5 1 880 MHz to 1 900 MHz, 1 935 MHz to 1 960 MHz and 2 010 MHz to 2 025 MHz RF band 00100.59 F.6 1 880 MHz to 1 900 MHZ, 1 955 MHz to 1 980 MHz and 2 010 MHz to 2 025 MHz RF band 00101.60 F.7 US ISM band carriers.61 F.7.1 902 MHz to 928 MHz RF band 01000.61 F.7.2 2 400 MHz to 2 483,5 MHz RF band 01001.61 Annex G (informative): Bibliography.62 Annex H (informative): Change history.63 History.64
ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 7
Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Project Digital Enhanced Cordless Telecommunications (DECT). The present document is part 2 of a multi-part deliverable. Full details of the entire series can be found in part 1 [1]. Further details of the DECT system may be found in TR 101 178 [10] and ETR 043 [9].
National transposition dates Date of adoption of this EN: 27 June 2003 Date of latest announcement of this EN (doa): 30 September 2003 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 March 2004 Date of withdrawal of any conflicting National Standard (dow): 31 March 2004
ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 8
1 Scope The present document gives an introduction and overview of the complete Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). The present document of the DECT CI specifies the physical channel arrangements. DECT physical channels are radio communication paths between two radio end points. A radio end point is either part of the fixed infrastructure or a Portable Part (PP), typically a handset. The assignment of one or more particular physical channels to a call is the task of higher layers. The Physical Layer (PHL) interfaces with the Medium Access Control (MAC) layer, and with the Lower Layer Management Entity (LLME). On the other side of the PHL is the radio transmission medium which has to be shared extensively with other DECT users and a wide variety of other radio services. The tasks of the PHL can be grouped into five categories: a) to modulate and demodulate radio carriers with a bit stream of a defined rate to create a radio frequency channel; b) to acquire and maintain bit and slot synchronization between transmitters and receivers; c) to transmit or receive a defined number of bits at a requested time and on a particular frequency; d) to add and remove the synchronization field and the Z-field used for rear end collision detection; e) to observe the radio environment to report signal strengths. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ETSI EN 300 175-1: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 1: Overview". [2] ETSI EN 300 175-3: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 3: Medium Access Control (MAC) Layer". [3] ETSI EN 300 175-4: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data Link Control (DLC) Layer". [4] ETSI EN 300 175-5: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 5: Network (NWK) Layer". [5] ETSI EN 300 175-6: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 6: Identities and Addressing". [6] ETSI EN 300 176-1: "Digital Enhanced Cordless Telecommunications (DECT); Approval test specification; Part 1: Radio". [7] ITU-R Recommendation M.1457: "Detailed specifications of the radio interfaces of International Mobile Telecommunications-2000 (IMT-2000)". SIST EN 300 175-2 V1.7.1:2003

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[8] ITU-T Recommendation V.11: "Electrical characteristics for balanced double-current interchange circuits operating at data signalling rates up to 10 Mbit/s". [9] ETSI ETR 043: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Services and facilities requirements specification". [10] ETSI TR 101 178: "Digital Enhanced Cordless Telecommunications (DECT); A High Level Guide to the DECT Standardization". [11] FCC 02-151: "Federal Communications Commission, Second Report and Order, Amendment of Part 15 of the Commission's Rules Regarding Spread Spectrum Devices". [12] ERC/DEC(99)25: "ERC Decision of 29 November 1999 on the harmonized utilisation of spectrum for terrestrial Universal Mobile Telecommunications System (UMTS) operating within the bands 1 900 - 1 980 MHz, 2 010 - 2 025 MHz and 2 110 - 2 170 MHz". [13] ERC/DEC(00)01: "ERC Decision of 28 March 2000 extending ERC/DEC/(97)07 on the frequency bands for the introduction of terrestrial Universal Mobile Telecommunications System (UMTS)". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply:
antenna diversity: See EN 300 175-1 [1]. cell: See EN 300 175-1 [1]. Central Control Fixed Part (CCFP): See EN 300 175-1 [1]. channel: See EN 300 175-1 [1]. cluster: See EN 300 175-1 [1]. Connection Oriented mode (C/O): See EN 300 175-1 [1]. Cordless Radio Fixed Part (CRFP): See EN 300 175-1 [1]. coverage area: See EN 300 175-1 [1]. Dect Network (DNW): See EN 300 175-1 [1]. double duplex bearer: See EN 300 175-1 [1]. double simplex bearer: See EN 300 175-1 [1]. double slot: See EN 300 175-1 [1]. down-link: See EN 300 175-1 [1]. duplex bearer: See EN 300 175-1 [1]. Fixed Part (DECT Fixed Part) (FP): See EN 300 175-1 [1]. Fixed Radio Termination (FT): See EN 300 175-1 [1]. frame: See EN 300 175-1 [1]. full slot (slot): See EN 300 175-1 [1]. guard space: See EN 300 175-1 [1]. half slot: See EN 300 175-1 [1]. SIST EN 300 175-2 V1.7.1:2003

ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 10 handover: See EN 300 175-1 [1]. IMT-2000: International Mobile Telecommunications, Third Generation Mobile Systems IMT-FT: International Mobile Telecommunications, FDMA/TDMA NOTE: This is the DECT family member of IMT-2000. intercell handover: see EN 300 175-1 [1]. intracell handover: See EN 300 175-1 [1]. Lower Layer Management Entity (LLME): See EN 300 175-1 [1]. multiframe: See EN 300 175-1 [1]. physical channel (channel): See EN 300 175-1 [1]. Portable Part (DECT Portable Part) (PP): See EN 300 175-1 [1]. Portable radio Termination (PT): See EN 300 175-1 [1]. public access service: See EN 300 175-1 [1]. radio channel: See EN 300 175-1 [1]. radio end point: See EN 300 175-1 [1]. Radio Fixed Part (RFP): See EN 300 175-1 [1]. Repeater Part (REP): See EN 300 175-1 [1]. RF carrier (carrier): See EN 300 175-1 [1]. RF channel: See EN 300 175-1 [1]. simplex bearer: See EN 300 175-1 [1]. Single Radio Fixed Part (SRFP): See EN 300 175-1 [1]. TDMA frame: See EN 300 175-1 [1]. Wireless Relay Station (WRS): See EN 300 175-1 [1]. 3.2 Abbreviations For the purposes of the present document the following abbreviations apply: AM Amplitude Modulation BER Bit Error Rate CCFP Central Control Fixed Part CI Common Interface (standard) CRFP Cordless Radio Fixed Part dBc dB relative to the peak power of an unmodulated carrier dBm dB relative to 1 milliwatt DBPSK Differential Binary Phase Shift Keying DC Direct Current DLC Data Link Control layer DQPSK Differential Quaternary Phase Shift Keying
DSV Digital Sum Variation EIRP Effective Isotropic Radiated Power ERP Effective Radiated Power FP Fixed Part FT Fixed radio Termination Fy Frequency SIST EN 300 175-2 V1.7.1:2003

ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 11 GFSK Gaussian Frequency Shift Keying GMSK Gaussian Minimum Shift Keying GPS Global Positioning System ISM Industrial, Scientific and Medical LLME Lower Layer Management Entity MAC Medium Access Control layer MCM Minimum Common Multiple MFN MultiFrame Number NTP Normal Transmitted Power NWK NetWorK PCMCIA Personal Computer Memory Card International Association PHL PHysical Layer PM-SAP Physical layer Management entity Service Access Point PP Portable Part ppm parts per million PSCN Primary receiver Scan Carrier Number PT Portable radio Termination REP REpeater Part RF Radio Frequency RFP Radio Fixed Part RMS Root Mean Square RPN Radio fixed Part Number SAP Service Access Point SAR Specific Absorption Rate SDU Service Data Unit TDD Time Division Duplex TDMA Time Division Multiple Access UMTS Universal Mobile Telecommunication System UTC Universal Time Coordinated WRS Wireless Relay Station 4 PHL services A physical channel provides a simplex bit-pipe between two radio end points. To establish, for example, a duplex telephone connection, two physical channels have to be established between the endpoints. Radio spectrum is needed to create a physical channel. The radio spectrum space has three dimensions: - geometric (geographic) space; - frequency; - time. Spectrum is assigned to physical channels by sharing it in these three dimensions. DECT provides a mechanism called "handover", to release a physical channel and to establish another one in any or all of the three dimensions without releasing the end-to-end connection. The requirements of the present document should be read in conjunction with EN 300 176-1 [6]. The requirements specified apply for nominal conditions unless extreme conditions are stated. Tests at extreme conditions may include combinations of limit values of extreme temperature and of power supply variation, defined for each case in EN 300 176-1 [6]. Nominal and extreme temperature ranges are defined below: Nominal temperature: PP, FP, RFP, CCFP +15°C to +35°C; Extreme temperature: PP 0°C to +40°C; FP, RFP, CCFP, class E1 +10°C to +40°C; SIST EN 300 175-2 V1.7.1:2003

ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 12 FP, RFP, CCFP, class E2 -10°C to +55°C. The environmental class E1 refers to installation in indoor heated and/or cooled areas allowing for personal comfort, e.g. homes, offices, laboratories or workshops. The environmental class E2 refers to all other installations. For nominal temperature, each measurement is made at the temperature of the test site, which shall be within +15°C to +35°C. For extreme temperatures, additional measurements are made, at each limit value of the extreme temperature. 4.1 RF channels (access in frequency) 4.1.1 Nominal position of RF carriers DECT carriers are specified for the whole frequency range 1 880 MHz to 1 980 MHz and 2 010 MHz to 2 025 MHz. Carrier positions in the 902 MHz to 928 MHz ISM band and the 2 400 MHz to 2 483,5 MHz ISM band have been defined for the US market [11]. DECT is also an IMT-2000 [7] family member, called IMT-FT, the only member that provides for uncoordinated installations on an unlicensed spectrum. RF carriers for IMT-FT applications of DECT are placed within the parts of the European UMTS spectrum applicable for TDD operation. (See ERC/DEC(99)25 [12], ERC/DEC(00)01 [13].) E.g. within 1 900 MHz to 1 920 MHz, 1 920 MHz to 1 980 MHz and/or 2 010 MHz to 2 025 MHz. The most common spectrum allocation is 1 880 MHz to 1 900 MHz, but outside Europe spectrum is also available in 1 900 MHz to 1 920 MHz and in 1 910 MHz to 1 930 MHz (several countries). Ten RF carriers are defined in the frequency band 1 880 MHz to 1 900 MHz with centre frequencies Fc given by: Fc = F0 - c x 1,728 MHz where: F0 = 1 897,344 MHz; and c = 0,1, ., 9. Above this band, additional carriers are defined in annex F. Annex F shows the carrier frequencies for c = 0 to 9 and for c ≥ 10 and RF bands 00001 to 01001 (see EN 300 175-3 [2], clauses 7.2.3.3 and 7.2.3.9). The frequency band between Fc - 1,728/2 MHz and Fc + 1,728/2 MHz shall be designated RF channel c. NOTE: A nominal DECT RF carrier is one whose centre frequency is generated by the formula: Fg = F0 - g x 1,728 MHz, where g is any integer. All DECT equipment should when allowed be capable of working on all 10 RF channels, c= 0,1, ., 9. New or modified carrier positions and/or frequency bands can (locally) be defined when needed by utilizing reserved RF band numbers. 4.1.2 Accuracy and stability of RF carriers At an RFP the transmitted RF carrier frequency corresponding to RF channel c shall be in the range Fc ± 50 kHz at extreme conditions. At a PP the centre frequency accuracy shall be within ±50 kHz at extreme conditions either relative to an absolute frequency reference or relative to the received carrier, except that during the first 1 s after the transition from the idle-locked state to the active-locked state the centre frequency accuracy shall be within ±100 kHz at extreme conditions relative to the received carrier. NOTE: The above state transition is defined in EN 300 175-3 [2]. The maximum rate of change of the centre frequency at both the RFP and the PP while transmitting, shall not exceed 15 kHz per slot. SIST EN 300 175-2 V1.7.1:2003

ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 13 4.2 Time Division Multiple Access (TDMA) structure (access in time) 4.2.1 Frame, full-slot, double-slot, and half-slot structure To access the medium in time, a regular TDMA structure is used. The structure repeats in frames of 11 520 symbols, and the data is transmitted at a symbol rate of 1 152 ksymbol/s. Within this frame 24 full-slots are created, each consisting of two half-slots. A double slot has a length of two full slots, and starts concurrently with an even numbered full slot (see figures 1, 2 and 3). NOTE: Some DECT documents sometimes refer to bits instead of symbols due to the fact that symbol and bit become synonyms for the mandatory 2-level modulation, for which most physical layer tests are defined, see EN 300 176-1 [6]. fullslot0fullslot1fullslot2fullslot11fullslot12fullslot13fullslot23fullslot23fullslot0normalRFP transmitnormalPP transmitone frame, 11 520 bits Figure 1: Full slot format Full-slots are numbered from K = 0 to 23, and half-slots are numbered L = 0 or 1, where half-slot 0 occurs earlier than half-slot 1. Normally full-slots K = 0 to 11 are used in the RFP to PP direction, while full slots K = 12 to 23 are normally used in the PP to RFP direction. Double slots are numbered K = 0 to 22 for even values of K. Each full-slot has a duration of 480 symbol intervals. Symbol intervals within a full-slot are denoted f0 to f479 where interval f0 occurs earlier than interval f1. Each half-slot has a duration of 240 symbol intervals. Half-slots commence at f0 or f240 (see figure 2). full-slot (K-1)half-slotL=1 480 bits full-slot (K)half-slotL=1half-slotL=0full-slot (K+1)half-slotL=0240 bits240 bitsf0f240f479 Figure 2: Half-slot format Each double slot has a duration of 960 symbol intervals. Symbol intervals within a double slot are denoted f0 to f959. Symbols f0 to f479 coincide with the same notation for full slots with even K, K(e). double-slot (K(e)-2)full-slotK(e)-1 960 bits full-slotK(e)+1full-slotK(e)full-slotK(e)+2480 bits480 bitsf0f479f959double-slot (K(e))double-slot (K(e)+2) Figure 3: Double slot format SIST EN 300 175-2 V1.7.1:2003

ETSI ETSI EN 300 175-2 V1.7.1 (2003-07) 14 NOTE: Each radio end point has its own timing of the TDMA structure due to propagation delay and non-synchronized systems. 4.2.2 Reference timer accuracy and stability The reference timer of a RFP or a PP is a notional clock to which the timing parameters of the TDMA framing are related. A PP shall have its reference timer stability and accuracy better than 25 ppm at extreme conditions. RFPs that can work with more than one duplex pair of physical channels per frame are known as multi-channel RFPs. Single channel RFPs can only work with one duplex pair of physical channels per frame (excluding handover situations). A multi channel RFP shall have its reference timer stability and accuracy better than 5 ppm and better than 10 ppm at extreme conditions. A single channel RFP shall have reference timer stability and accuracy better than 10 ppm at extreme conditions. 4.2.3 RFP transmission jitter The nominal time when a packet should occur at the RFP antenna is (by this definition) synchronous to the RFP reference timer. The jitter of a RFP packet transmission in a slot refers to the occurrence at the antenna of the start of symbol p0 of that packet. The jitter is defined in relation to the reference timer of that RFP. The jitter of a packet transmission shall be less than ±1 µs at extreme conditions. The jitter between p0 and every other symbol in a packet shall be within ±0,1 µs. NOTE: 0,1
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