ETSI I-ETS 300 131 ed.1 (1992-04)

SLOVENSKI STANDARD
01-december-2003
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Radio Equipment and Systems (RES); Common air interface specification to be used for
the interworking between cordless telephone apparatus in the frequency band 864.1
MHz to 868.1 MHz, including public access services
Ta slovenski standard je istoveten z: I-ETS 300 131 Edition 1
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERIM
EUROPEAN I-ETS 300 131
TELECOMMUNICATION April 1992
STANDARD
Source: ETSI TC-RES Reference: CV/RES-0001
ICS: 33.060, 33.060.20
CT2, CAI
Key words:
Radio Equipment and Systems (RES);
Common air interface specification to be used for
the interworking between cordless telephone apparatus
in the frequency band 864,1 MHz to 868,1 MHz,
including public access services
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No 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 1992. All rights reserved.
New presentation - see History box

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I-ETS 300 131: April 1992
Whilst 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.

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I-ETS 300 131: April 1992
Contents
Foreword . 13
Introduction . 13
1 Scope . 15
2 Normative references . 16
3 Definitions and abbreviations . 17
4 Radio frequency interface . 23
4.1 General . 23
4.2 Channel frequencies . 23
4.2.1 Channel centre frequencies . 23
4.2.2 Channel frequency accuracy . 23
4.2.3 Rate of change of transmit centre frequency . 23
4.2.4 CTA access . 23
4.3 Signalling strategy . 23
4.3.1 CTA access . 23
4.3.2 Signalling during communication . 23
4.3.3 Signalling outside communication . 23
4.4 Dynamic channel allocation strategy . 24
4.4.1 Incoming calls . 24
4.4.2 Outgoing calls . 24
4.4.3 Channel selection strategies . 24
4.4.4 Free channel . 24
4.5 Radio transmitters . 25
4.5.1 RF power . 25
4.5.1.1 Maximum RF power . 25
4.5.1.2 Minimum RF power . 25
4.5.1.3 Output power at low power setting . 25
4.5.2 Modulation . 25
4.5.3 Adaptive transmitter power strategy . 25
4.5.3.1 General . 25
4.5.3.2 CPP only . 25
4.5.3.3 CPP and CFP . 25
4.5.3.4 Power level changes . 26
4.5.4 Transmitter burst envelope . 26
4.5.4.1 Amplitude . 26
4.5.4.2 Dispersion effects . 26
4.5.4.3 Guard time . 26
4.5.5 Adjacent channel power (narrow band) . 26
4.5.6 Out of band power arising from transmitter transients . 26
4.5.7 Intermodulation attenuation . 27
4.6 Radio receivers . 27
4.6.1 G ener al . 27
4.6.1.1 CTA including three or more RFPs . 27
4.6.1.2 Other CTAs . 27
4.6.1.3 CTAs without integral or supplied antenna . 27
4.6.2 Sensitivity . 27
4.6.2.1 Receiver sensitivity for CFP or CPP using an integral or supplied antenna
............................................................... 27
4.6.2.2 Receiver sensitivity with a 50 ohm connector . 27
4.6.3 Interference rejection . 28
4.6.3.1 Unmodulated interfering carrier signal . 28

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I-ETS 300 131: April 1992
4.6.3.2 Modulated asynchronous interfering signal . 28
4.6.4 Blocking due to spurious responses . 29
4.6.5 Intermodulation response rejection . 29
4.7 Combined radio transmitter/receivers . 29
4.7.1 Adverse power supply conditions . 29
4.7.2 Spurious emissions of the combined transmitter/receiver . 30
4.8 Termination of the communication state . 30
4.8.1 Clear down signal sequence . 30
4.8.2 Cessation of RF activity . 30
4.8.3 Off-line timing . 30
4.9 Channel scanning . 30
4.9.1 Available channels . 30
4.9.2 Response times . 30
4.9.2.1 Outgoing . 30
4.9.2.2 Incoming . 31
4.10 In-communication channel switching . 31
4.10.1 Capability . 31
4.10.2 Channel change delay . 31
4.11 Controls . 31
4.12 Synthesisers and PLL systems . 31
5 Signalling layer one . 32
5.1 Data structure and timing . 32
5.1.1 Data rate . 32
5.1.2 Time-division duplexing . 32
5.1.3 Master-slave relationship . 33
5.2 Sub-channel multiplexes . 33
5.2.1 Channel Markers (CHM) and synchronism markers (SYNC) . 33
5.2.2 Multiplex one . 34
5.2.3 Multiplex two . 35
5.2.4 Multiplex three . 36
5.3 Calling channel detection . 37
5.3.1 Calling channel detection at the CPP . 37
5.3.2 Calling channel detection at the CFP . 38
5.4 Link set up and establishment . 38
5.4.1 Link set up from CFP to CPP . 38
5.4.2 Link set up from CPP to CFP . 39
5.4.3 Set up collision resolution . 40
5.4.4 Link re-establishment on the existing channel . 40
5.4.5 Link re-establishment on a different channel . 40
5.5 ID handshaking . 40
5.5.1 General . 40
5.5.1.1 Handshake code series . 40
5.5.1.2 Code allocation . 41
5.5.1.3 Code matching . 41
5.5.1.4 Code recognition . 41
5.5.1.5 Communication state . 41
5.5.1.6 Lack of in-communication handshake: RF activity . 41
5.5.1.7 Lack of in-communication handshake: off-line state . 41
5.5.2 ID handshake operation . 41
5.5.3 Handshake protocol . 41
5.5.4 Reception of valid handshakes . 42
5.5.5 ID handshake mechanism . 43
6 Signalling layer two . 44
6.1 Code word usage . 44
6.2 General message format . 44
6.3 General packet format . 45
6.3.1 Order of transmission and field mapping convention . 45

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I-ETS 300 131: April 1992
6.3.2 IDLE_D . 45
6.3.3 Synchronisation word (SYNCD) . 45
6.3.4 Code Words - (address and data code words) . 46
6.3.5 Code word transmission sequence. . 46
6.3.6 Check field encoding (octets 7 and 8) . 46
6.4 Fixed length packet format (FT = 0) . 47
6.4.1 SR (octet 1 (part)) . 47
6.4.2 LS (octet 1 (part)) . 47
6.4.3 HIC (octets 1 (part), 2, 3) . 48
6.4.4 MIC (octet 4) . 48
6.4.5 LID (octets 5 and 6) . 48
6.5 Variable length packet format (FT = 1) . 50
6.5.1 PI (octet 1) . 50
6.5.2 L3_end (octet 1) . 50
6.5.3 Endwrd and code word no/rem encoding (octet 1) . 51
6.5.4 Control (octet 2) . 51
6.5.5 Content . 52
6.5.6 Link supervisory "messages" . 52
6.5.7 Fill-in . 54
6.6 Link establishment and re-establishment . 54
6.6.1 Link set up from the CPP . 54
6.6.2 Link re-establishment . 55
6.6.3 Link set up from the CFP . 55
6.6.4 CFP polling . 56
6.6.5 CPP poll response . 57
6.6.6 CPP link set up and re-establishment diagram . 58
6.6.7 CFP link set up diagram . 59
6.7 Layer two link protocol set up and control . 60
6.7.1 Layer two link protocol timings . 60
6.7.2 Layer two link operation . 60
6.7.2.1 Link initialisation (see subclause 6.5.6 (iii)) . 61
6.7.2.2 Packet transmission . 61
6.7.2.3 Packet reception . 62
7 Signalling layer three . 64
7.1 Single octet information elements . 64
7.2 Variable length information elements . 65
7.2.1 Keypad information element (KP) . 67
7.2.2 Display information element (DISP) . 68
7.2.3 Signal information element (SIG) . 70
7.2.4 Feature activation information element (FA) . 71
7.2.5 Feature indication information element (FI) . 74
7.2.6 Channel control information element (CC) . 77
7.2.7 Initialisation information element (INIT) . 78
7.2.8 Authentication request information element (AUTH_REQ) . 79
7.2.9 Authentication response information element (AUTH_RES) . 80
7.2.10 Terminal capabilities information element (TERM_CAP) . 81
7.2.11 Base capabilities information element (BAS_CAP) . 82
7.2.12 Character information element (CHAR) . 83
7.2.13 On-air (de-)registration acknowledge information element (OARAC) . 84
7.2.14 Parameter set information element (PAR_SET) . 84
7.2.15 Parameter request information element (PAR_REQ) . 85
7.2.16 Parameter response information element (PAR_RES) . 85
7.2.17 Alternative authentication request information element (AUTH2_REQ) . 85
7.2.18 Alternative authentication response information element (AUTH2_RES) . 86
7.2.19 Number of CPPs polled information element (NO_POLL) . 86
7.3 Layer three mandatory syntax . 86
7.3.1 Access to layer three . 86
7.3.2 Exit from layer three . 86

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7.3.3 Emergency access . 87
7.3.4 On-air registration . 87
8 Speech coding and telephony . 88
8.1 Definitions . 88
8.1.1 Cordless Portable Part (CPP) . 88
8.1.2 Fixed geometry CPP . 88
8.1.3 Variable geometry CPP . 88
8.1.4 CAI ADPCM voice codec (CIC = 0) . 88
8.2 Speech transmission algorithm . 88
8.2.1 Speech coding algorithm . 88
8.2.2 Codec for telepoint CFP . 89
8.3 Bit transmission sequence . 89
8.4 Frequency responses . 89
8.4.1 Sending frequency response . 89
8.4.2 Receiving frequency response . 90
8.5 Digital signal level . 91
8.6 Sending and receiving loudness ratings . 91
8.7 Sidetone loudness ratings . 92
8.7.1 Sidetone for analogue telephony . 92
8.7.2 Sidetone for digital telephony . 92
8.7.2.1 Talker sidetone . 92
8.7.2.2 Listener sidetone . 92
8.8 Clipping . 93
8.9 Distortion . 93
8.9.1 Sending distortion . 93
8.9.2 Receiving distortion . 93
8.10 Noise . 94
8.10.1 Sending . 94
8.10.2 Sending (narrow-band noise) . 94
8.10.3 Receiving . 94
8.11 Delay . 94
8.11.1 Handset delay . 94
8.11.2 Base delay . 94
8.11.3 Network echo from a CFP with a 2-wire analogue interface . 94
8.12 Terminal coupling loss . 95
8.12.1 Weighted terminal coupling loss (TCLw) . 95
8.12.2 Stability loss (fixed geometry CPPs) . 95
8.12.3 Stability loss (variable geometry CPPs) . 95
8.12.4 CFP with a 4-wire interface . 95
8.13 Out of band signals . 96
8.13.1 Discrimination against out-of-band input signals (sending) . 96
8.13.2 Spurious out-of-band signals (receiving) . 96
8.14 Sampling frequency level (receiving) . 96
8.15 Acoustic shock . 96
8.15.1 Maximum intended sound pressure level . 96
8.15.2 Maximum possible sound pressure level . 96
8.16 Audible incoming call indication . 97
8.16.1 Provided on CPP: sound pressure level . 97
9 Radio frequency parametric and system tests . 98
9.1 Test conditions, power sources and ambient temperatures . 98
9.1.1 Normal and extreme test conditions . 98
9.1.2 Test power source . 98
9.1.3 Normal test conditions . 98
9.1.3.1 Normal temperature and humidity. 98
9.1.3.2 Normal test power source . 98
9.1.3.2.1 Mains voltage . 98
9.1.3.2.2 Regulated lead acid battery power sources . 98

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I-ETS 300 131: April 1992
9.1.3.2.3 Nickel cadmium battery . 99
9.1.3.2.4 Other power sources . 99
9.1.4 Extreme test conditions . 99
9.1.4.1 Extreme temperatures . 99
9.1.4.2 Extreme test source voltages . 99
9.1.4.2.1 Mains voltage . 99
9.1.4.2.2 Regulated lead acid battery power sources . 99
9.1.4.2.3 Nickel cadmium battery . 99
9.1.4.2.4 Other power sources . 99
9.1.5 Procedure for tests at extreme temperatures . 99
9.2 Electrical test conditions . 100
9.2.1 Arrangements for signals to be applied to the fixed and portable receivers . 100
9.2.2 Artificial antenna . 100
9.2.3 Test fixture for integral antenna . 100
9.2.4 Test site and general arrangements for measurements involving the use of radiated
fields . 101
9.2.4.1 Test site . 101
9.2.4.2 Test antenna . 101
9.2.4.3 Substitution antenna . 101
9.2.4.4 Optional additional indoor site . 101
9.2.5 Transceiver test facility . 102
9.3 Transmitter . 103
9.3.1 Transmitter carrier power . 103
9.3.1.1 Definition . 103
9.3.1.2 Method of measurement for equipment with an antenna connection . 103
9.3.1.3 Method of measurement for equipment with an integral antenna. . 103
9.3.1.3.1 Method of measurement under normal test conditions . 103
9.3.1.3.2 Method of measurement under extreme test conditions . 104
9.3.1.4 Limits . 104
9.3.2 Adjacent channel power (narrow-band measurement) . 104
9.3.2.1 Definition . 104
9.3.2.2 Method of measurement . 104
9.3.2.3 Characteristics of the spectrum analyser . 105
9.3.2.4 Integrating and power summing device . 105
9.3.2.5 Limits . 106
9.3.3 Out of band power arising from transmitter transients . 106
9.3.3.1 Definition . 106
9.3.3.2 Method of measurement . 106
9.3.3.3 Characteristics of the spectrum analyser . 106
9.3.3.4 Limits . 106
9.3.4 Intermodulation attenuation . 106
9.3.4.1 Definition . 107
9.3.4.2 Method of measurement . 107
9.3.4.3 Limits . 107
9.3.5 Prevention of mis-operation due to adverse power supply conditions . 107
9.3.5.1 Definition . 107
9.3.5.2 Method of measurement . 107
9.3.5.3 LimitsThe limits shall be those specified in subclause 4.7.1. . 108
9.4 Spurious emissions . 108
9.4.1 Spurious emissions of the combined transmitter/receiver . 108
9.4.1.1 Definition . 108
9.4.1.2 Method of measuring the power level (i) . 108
9.4.1.3 Method of measuring the effective radiated power (ii) . 108
9.4.1.4 Limits . 109
9.5 Radio frequency system operation . 109
9.5.1 Definitions . 109
9.5.2 Channel frequencies . 109
9.5.2.1 Ability to transmit on each of the 40 channels . 109
9.5.2.2 Ability to receive on each of the 40 channels . 109

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9.5.2.3 Ability to receive when the carrier frequency is up to ±10 kHz from
nominal . 109
9.5.2.4 Ability to receive when carrier frequency is varying at a rate of up to
1 kHz/ms . 109
9.5.3 Dynamic RF channel allocation strategy . 109
9.5.3.1 No channel is occupied . 109
9.5.3.2 One channel only below the threshold . 110
9.5.3.3 All channels occupied . 110
9.5.4 Adaptive CPP transmitter power control . 110
9.5.5 RF modulation . 110
9.5.5.1 Peak frequency deviation: transmission . 110
9.5.5.2 Peak frequency deviation: reception . 110
9.5.6 RF envelope . 110
9.5.6.1 Transmitter output: ramp-down . 110
9.5.6.2 Transmitter output: ramp-up . 110
9.5.7 Radio receiver sensitivity . 111
9.5.7.1 Raw bit error rate . 111
9.5.8 Radio receiver blocking performance . 111
9.5.8.1 Ability to receive in the presence of unmodulated interfering signals . 111
9.5.8.2 Ability to receive in the presence of asynchronous modulated interfering
signals . 112
9.5.9 Blocking due to spurious responses . 112
9.5.9.1 Blocking requirements . 112
9.5.9.2 Intermodulation response rejection . 112
9.6 Transmitter modulation . 112
9.7 Power supply units . 112
9.8 Declarations by the manufacturer . 112
9.9 Labelling . 113
10 Signalling system tests . 113
10.1 Multiplex alignment and timing . 113
10.1.1 Alignment of D and B channels in MUX1 . 113
10.1.2 Alignment of D and SYN channels in MUX2 . 113
10.1.3 Transmit/listen timing of MUX3 . 113
10.1.4 Alignment of P, D and SYN channels in MUX3 . 113
10.2 Calling channel detection at the CPP . 113
10.3 Calling channel detection at the CFP . 113
10.4 Link set up from CFP to CPP . 114
10.4.1 For a CFP . 114
10.4.1.1 To acquire a free RF channel and generate MUX2 Transmissions . 114
10.4.1.2 Generation of LINK_GRANT . 114
10.4.1.3 If no valid MUX2 response is received . 114
10.4.2 For a CPP . 114
10.5 Link set up from CPP to CFP . 114
10.5.1 For a CPP . 114
10.5.1.1 To acquire a free RF channel and generate MUX3 transmissions of
LINK_REQUEST . 114
10.5.1.2 Valid MUX2 response . 114
10.5.1.3 No valid MUX2 response . 114
10.5.2 For a CFP . 115
10.6 Set up collision resolution . 115
10.7 Link re-establishment on the existing channel . 115
10.7.1 For a CPP . 115
10.7.1.1 Valid link re-establishment message . 115
10.7.1.2 Valid MUX2 response . 115
10.7.1.3 No valid MUX2 response . 115
10.7.2 For a CFP . 115
10.7.2.1 Valid link re-establishment message . 115
10.7.2.2 Valid MUX3 LINK REQUEST . 115

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10.7.2.3 No valid MUX3 LINK REQUEST . 115
10.8 Link re-establishment on a different channel . 116
10.8.1 For a CPP . 116
10.8.2 For a CFP . 116
10.9 Generation and reception of valid handshakes . 116
10.9.1 Handshake intervals . 116
10.9.2 For a CPP . 116
10.9.2.1 Response to loss of valid handshakes . 116
10.9.2.2 Re-acquisition of valid handshakes . 116
10.9.3 For a CFP . 116
10.9.3.1 Response to loss of valid handshakes . 116
10.9.3.2 Re-acquisition of valid handshakes . 116
10.10 Layer two parameters . 116
10.11 Layer one and layer two timers . 117
10.12 Acknowledged message protocol validation . 118
10.12.1 CPP response to received packets . 118
10.12.2 CPP transmit actions . 118
10.12.3 CFP response to received packets . 119
10.12.4 CFP transmit actions . 119
10.13 Handshake operation . 119
10.14 Layer three parameters . 119
10.14.1 The receiving end . 119
10.14.2 The transmitting end . 120
10.15 Layer three timers . 120
10.16 Declarations by the manufacturer . 120
10.16.1 Information . 120
10.16.2 Declarations . 120
10.17 Additional test requirements . 122
10.17.1 Specifics for telepoint to UKF1 . 122
10.17.2 Reserved for future use . 122
10.18 Characteristics of the reference test set . 122
11 Speech and telephony tests . 124
11.1 Measurement philosophy . 124
11.2 Digital signal level . 125
11.3 General conditions of test . 125
11.4 Sending sensitivity frequency response (subclause 8.4.1) . 126
11.5 Receiving sensitivity frequency response (subclause 8.4.2) . 126
11.6 Handset sending loudness rating (subclause 8.6 (i)) . 126
11.7 Handset receiving loudness rating (subclause 8.6 (ii)) . 126
11.8 Handset sidetone masking rating (subclause 8.7.2.1) . 126
11.9 Sending distortion (subclause 8.9.1) . 126
11.10 Receiving distortion (subclause 8.9.2) . 127
11.11 Sending noise (subclause 8.10.1) . 127
11.12 Sending noise (narrow band) (subclause 8.10.2) . 127
11.13 Receiving noise (subclause 8.10.3) . 127
11.14 Handset delay (subclause 8.11.1) . 127
11.15 Weighted terminal coupling loss (subclause 8.12.1) . 129
11.16 Stability loss - fixed geometry (subclause 8.12.2) . 130
11.17 Stability loss - variable geometry (subclause 8.12.3) . 130
11.18 Out of band (sending) (subclause 8.13.1) . 130
11.19 Out of band (receiving) (subclause 8.13.2) . 130
11.20 Sampling frequency level (receiving) (subclause 8.14) . 130
11.21 Acoustic shock (subclause 8.15) . 130
11.22 Listener sidetone (subclause 8.7.2.2) . 131
11.23 Sidetone distortion (subclause 8.9.3) . 131
11.24 Subjective speech quality . 131
11.24.1 Overall requirements . 131
11.24.2 CTA tested as an entirety . 131

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11.24.3 Codec to be treated in isolation . 132
11.24.4 CTA incorporating codec complying with 11.24.3 . 132
11.24.5 Standard of performance . 133
Annex A (normative) . 134
Layer three mandatory syntax diagrams . 134
A.1 CPP mandatory layer three initialisation syntax . 134
A.2 CFP mandatory layer three initialisation syntax . 135
A.3 Telepoint CPP mandatory layer three syntax . 136
A.4 Telepoint CFP mandatory layer three syntax . 137
Annex B (normative): . 138
Telepoint operation . 138
B.1 Minimum telepoint handset configuration . 138
B.2 Minimum telepoint base station configuration . 139
B.3 Telepoint authentication . 140
B.3.1 Introduction . 140
B.3.2 Basis of operation . 140
B.3.2.1 Identification information . 140
B.3.2.2 KEY number . 141
B.3.2.3 Function "F" . 141
B.3.2.4 Assignment of KEY numbers . 141
B.3.3 ZAP facility . 142
B.3.4 Registration data fields . 142
B.3.5 Entry of registration data . 142
B.3.5.1 Basic data entry . 142
B.3.5.2 Check digits . 143
B.3.5.3 Termination of data entry . 143
B.3.5.4 Example . 144
B.3.6 Man-machine interface (MMI) for registration . 144
B.3.7 Handset registration capacity. 145
Annex C (normative): . 146
Serial number format . 146
Annex D (normative): . 147
Accuracy of measurement . 147
D.1 Radio frequency parametric and system tests . 147
D.2 Signalling system tests . 147
D.3 Speech and telephony tests . 148
Annex E (informative) . 149
Interim arrangements . 149

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E.1 Minimum RF power . 149
E.2 Radio receiver sensitivity . 149
E.3 Portable part ADPCM voice codec . 149
E.4 Weighted terminal coupling loss . 149
E.5 Alternative authentication algorithms . 149
Annex F (informative) . 150
Message sequence diagrams . 150
F.1 Call set up to a telepoint CFP . 151
F.2 Call set up to a private CFP . 152
F.3 Private CFP incoming (group) call . 153
F.4 Telepoint CFP incoming call . 154
F.5 Call clear down . 155
F.6 On air registration from CPP to private CFP . 156
Annex G (informative): . 157
Code word example . 157
Annex H (informative): . 158
Intellectual property rights . 158
Annex J (normative): . 160
Subjective speech quality tests . 160
J.1 Preparation of master recordings . 161
J.1.1 Speech material . 161
J.1.2 Apparatus and environment . 161
J.1.3 Recording procedure . 162
J.1.4 Calibration signals and speech levels . 163
J.2 Processing of recordings . 164
J .2.1 G ener al . 164
J.2.2 Processing through the apparatus under test . 164
J.2.3 Processing through controlled distortion . 165
J.3 Conduct of listening test . 165
J.3.1 Apparatus, calibration and environment . 165
J.3.2 Selection of subjects. . 166
J .3.3 Pr oc edur e . 166
J.4 Treatment of results . 168
J.5 Determination of laboratory-specific Q-rating boundaries for the purposes of subclause 11.24.5 . . 176
J.6 References . 177

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Annex K (informative): . 178
Artificial echo loss for a CFP with a 4-wire interface . 178
Annex L (informative): . 179
Network echo from a CFP with a 2-wire analogue interface . 179
History: . 180

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I-ETS 300 131: April 1992
Foreword
This Interim European Telecommunication Standard (I-ETS) has been prepared by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI) and
has been adopted having undergone the ETSI standards approval procedure.
Parts of this I-ETS were prepared by the British Standards Institution (BSI), by the United Kingdom
Department of Trade and Industry (DTI) and by those companies listed in Annex H. It contains information
and copyright material, the property of these organisations. The connection of equipment specified here to
the Public Switched Telephone Network (PSTN) is covered in prETS 300 001 [1].
Every I-ETS prepared by ETSI is a voluntary standard. This I-ETS contains text concerning the type approval
of the equipment to which it relates. This text should be considered solely as guidance, and does not make
the I-ETS mandatory.
The standard includes two types of requirement: those that are required in all units; and those that are
optional in a unit, but shall be implemented in the specified manner if provided. The specifications of parts
one and two are requirements unless otherwise stated. The specifications of part three are optional unless
otherwise stated. The specifications of part four are requirements unless otherwise stated. The tests
specified in part five shall be passed by all units where the tested feature is provided.
Annexes A to D and Annex J of this standar
...