SIST EN 300 175-2 V1.9.1:2006

• Abstract:

  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, a privately owned Fixed Part (FP), typically a base station, 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.

• Status: Published
• Publication Date: 28-Feb-2006
• ICS: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT)
• ICS: 35.100.10 - Physical layer
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2006
• Due Date: 01-Mar-2006
• Completion Date: 01-Mar-2006
• Ref Project: ETSI EN 300 175-2 V1.9.1 (2005-09) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 2: Physical Layer (PHL)

Overview

SIST EN 300 175-2 V1.9.1:2006 defines the Physical Layer (PHL) specification for Digital Enhanced Cordless Telecommunications (DECT) systems. Developed by the Slovenian Institute for Standardization (SIST) and harmonized with EN 300 175-2, this standard identifies how DECT devices communicate over radio channels using the Common Interface (CI). The PHL provides the fundamental radio communication path between two radio end points, whether those are fixed infrastructure elements (base stations, known as Fixed Parts or FPs) or portable devices (handsets, known as Portable Parts or PPs).

The document sets out the physical channel arrangements and the core tasks of the PHL, supporting interoperability and consistent performance in DECT cordless telephony. It ensures DECT systems efficiently share radio spectrum with multiple users and services and facilitates smooth communication between transmitting and receiving devices.

Key Topics

• Physical Channel Definition: Describes how DECT assigns radio communication paths between fixed and portable endpoints.
• PHL Core Tasks:
  • Modulation and demodulation of radio carriers with bit streams.
  • Establishing and maintaining bit and slot synchronization for reliable communication.
  • Timely and frequency-specific transmission or reception of information bits.
  • Management of synchronization fields for precise slot allocation and collision detection.
  • Radio environment monitoring for signal strength reporting.
• Interfacing with Higher Layers: The PHL interfaces with the Medium Access Control (MAC) layer and Lower Layer Management Entity (LLME).
• Spectrum Sharing: Describes the methods for dynamic allocation and efficient use of the radio spectrum among users, supporting functionalities like handover and channel selection.
• Synchronization: Ensures accurate alignment between the network and devices for seamless handovers and minimized interference.
• DECT Packet Structure: Outlines basic physical packets, synchronization fields, and mechanisms to prevent rear-end packet collisions.

Applications

The standard is widely applicable in the design, deployment, and operation of DECT-based cordless telecommunications systems. Key areas of application include:

• Fixed and Cordless Telephony: Ensuring base stations and handsets can communicate reliably and seamlessly in both private (home, office) and public environments.
• Wireless Private Branch Exchange (PBX): Used in enterprise environments to provide wireless telephone extensions, boosting workplace mobility.
• Home and Small Office Communication: DECT phones for residential or SME markets, leveraging PHL for robust, interference-minimized connections.
• Industrial and Commercial Wireless Voice/Data Systems: Providing clear, reliable wireless links in environments requiring special coverage or extended range, including warehouses, retail facilities, and healthcare sectors.
• Public Access Services: Facilitating wireless voice services in public spaces using standardized channel arrangements.
• Compliance and Interoperability Testing: As a baseline for radio system manufacturers and integrators to verify that devices meet interoperability and regulatory requirements.

Related Standards

Implementation of SIST EN 300 175-2 is most effective in conjunction with:

• EN 300 175-1 – DECT Common Interface: Overview
• EN 300 175-3 – DECT Common Interface: Medium Access Control (MAC) Layer
• EN 300 175-4 – Data Link Control (DLC) Layer
• EN 300 176-1 – DECT Test Specifications: Radio
• ETSI ETR 043 – DECT CI: Services and Facilities Requirements Specification
• ITU-R Recommendation M.1457 – Radio Interfaces of IMT-2000
• ITU-T Recommendation V.11 – Electrical Characteristics for Balanced Circuits

These related standards provide frameworks for DECT network architecture, testing, and integration with international mobile telecommunications systems.

---

Keywords: Digital Enhanced Cordless Telecommunications, DECT, physical layer, radio communication, Common Interface, PHL, base station, handset, synchronization, spectrum sharing, cordless telephony, SIST, EN 300 175-2, wireless standards.

SLOVENSKI STANDARD
01-marec-2006
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH'(&7±6NXSQLYPHVQLN&,±
GHO)L]LþQDSODVW3+/
Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 2:
Physical Layer (PHL)
Ta slovenski standard je istoveten z: EN 300 175-2 Version 1.9.1
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
35.100.10 )L]LþQLVORM Physical layer
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)

Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 2: Physical Layer (PHL)
2 ETSI EN 300 175-2 V1.9.1 (2005-09)

Reference
REN/DECT-000227-2
Keywords
DECT, radio
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ETSI
3 ETSI EN 300 175-2 V1.9.1 (2005-09)
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 .13
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.16
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.17
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
ETSI
4 ETSI EN 300 175-2 V1.9.1 (2005-09)
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
ETSI
5 ETSI EN 300 175-2 V1.9.1 (2005-09)
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 π/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 π/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 π/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
ETSI
6 ETSI EN 300 175-2 V1.9.1 (2005-09)
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
7 ETSI EN 300 175-2 V1.9.1 (2005-09)
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: 26 August 2005
Date of latest announcement of this EN (doa): 30 November 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 May 2006
Date of withdrawal of any conflicting National Standard (dow): 31 May 2006

ETSI
8 ETSI EN 300 175-2 V1.9.1 (2005-09)
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, a
privately owned Fixed Part (FP), typically a base station, 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); Test
specification; Part 1: Radio".
[7] ITU-R Recommendation M.1457: "Detailed specifications of the radio interfaces of International
Mobile Telecommunications-2000 (IMT-2000)".
ETSI
9 ETSI EN 300 175-2 V1.9.1 (2005-09)
[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] Federal Communications Commission FCC 02-151: "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 harmonised 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].
ETSI
10 ETSI EN 300 175-2 V1.9.1 (2005-09)
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
CTA Cordless Terminal Adapter
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
D-SAP Data field-Service Access Point
DSV Digital Sum Variation
EIRP Equivalent Isotropically Radiated Power
ERP Effective Radiated Power
EVM Error-Vector Magnitude
FMID Fixed Part MAC Identity
ETSI
11 ETSI EN 300 175-2 V1.9.1 (2005-09)
FP Fixed Part
FT Fixed radio Termination
Fy Frequency
GFSK Gaussian Frequency Shift Keying
GMSK Gaussian Minimum Shift Keying
GPS Global Positioning System
ICNIRP International Commission on Non-Ionizing Radiation Protection
iDCS instant Dynamic Channel Selection
IMT-FT International Mobile Telecommunications - Frequency Time
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
RSSp Radio Signal Strength PP
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].
ETSI
12 ETSI EN 300 175-2 V1.9.1 (2005-09)
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;
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] and 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 × 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 × 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.
ETSI
13 ETSI EN 300 175-2 V1.9.1 (2005-09)
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.
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 a full slot
(see figures 1 to 3).
NOTE 1: 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].
normal normal
RFP transmit PP transmit
full full full full full full full full full
slot slot slot slot slot slot slot slot slot
23 0 1 2 11 12 13 23 0
one 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 10 and from 12 to 22. There is no double
slot 11 due to the TDM structure imposed on the DECT frame.
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
...