SIST ETS 300 085 E1:2003

SLOVENSKI STANDARD
01-december-2003
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Integrated Services Digital Network (ISDN); 3,1 kHz telephony teleservice; Attachment
requirements for handset terminals (Candidate NET 33)
Ta slovenski standard je istoveten z: ETS 300 085 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 085
TELECOMMUNICATION December 1990
STANDARD
Source: ETSI TC-TE Reference: T/TE 10-06
ICS: 33.080
Candidate NET 33, ISDN, 3,1 kHz telephony terminals
Key words:
Integrated Services Digital Network (ISDN);
3,1 kHz telephony teleservice
Attachment requirements for handset terminals
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 1990. All rights reserved.
New presentation - see History box

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ETS 300 085: December 1990
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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ETS 300 085: December 1990
Contents
Foreword.9
1 Scope .11
2 Normative references .11
3 Definitions and abbreviations.13
3.1 Definitions.13
3.2 Abbreviations.13
4 Access channel selection .14
5 Call control functions.14
5.1 Outgoing calls.14
5.1.1 Overlap and en-bloc sending .14
5.1.2 Coding of Bearer Capability (BC) information element.14
5.1.3 Coding of High Layer Compatibility (HLC) information element .15
5.1.4 Coding of Low Layer Compatibility (LLC) information element.15
5.2 Incoming calls.16
5.2.1 Compatibility checking .16
5.2.1.1 Coding of Bearer Capability (BC) information element .17
5.2.1.2 Coding of High Layer Compatibility (HLC) information
element.17
5.2.1.3 Coding of Low Layer Compatibility (LLC) information
element.17
5.2.1.4 Terminal selection.17
5.2.1.4.1 Operation of the designated terminal
under restricted power conditions.18
5.2.2 Incoming call indication .18
5.2.2.1 Terminal is not engaged in a telephone call.18
5.2.2.2 Terminal is busy .18
5.3 Information tones .18
5.4 Multi Frequency Push Button (MFPB) signalling .19
6 Transmission aspects .19
6.1 General.19
6.1.1 Encoding .19
6.1.2 Relative level.19
6.1.3 Volume control.19
6.2 Speech performance characteristics (Handset 3,1 kHz telephony). 19
6.2.1 Sensitivity - frequency response .19
6.2.1.1 Sending .19
6.2.1.2 Receiving .20
6.2.2 Sending and receiving loudness ratings (SLR and RLR).20
6.2.2.1 Nominal values .20
6.2.2.2 Volume control .20
6.2.3 Sidetone.21
6.2.3.1 Talker sidetone.21
6.2.3.2 Listener sidetone.21
6.2.4 Terminal coupling loss (TCL).21
6.2.4.1 Weighted Terminal Coupling Loss (TCLw) .21
6.2.4.2 Stability loss.21
6.2.5 Distortion.21
6.2.5.1 Sending .21

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ETS 300 085: December 1990
6.2.5.1.1 Method 1 5 (Pseudo random noise
stimulus) .21
6.2.5.1.2 Method 2 (Sinusoidal test signal) .22
6.2.5.2 Receiving .22
6.2.5.2.1 Method 1 .22
6.2.5.2.2 Method 2 .23
6.2.5.3 Sidetone .23
6.2.6 Variation of gain with input level.23
6.2.6.1 Sending.23
6.2.6.2 Receiving .24
6.2.7 Out-of-band signals .24
6.2.7.1 Discrimination against out-of-band input signals (sending) .24
6.2.7.2 Spurious out-of-band (receiving).24
6.2.8 Noise.25
6.2.8.1 Sending.25
6.2.8.2 Receiving .25
6.2.8.3 Level of sampling frequency (receiving) .25
6.2.9 Acoustic shock.25
6.2.9.1 Continuous signal.25
6.2.9.2 Peak signal .25
6.2.10 Delay.25
6.3 Loudspeaking and handsfree telephony.25
6.4 Non-linear devices.26
7 Power feeding.26
7.1 General conditions.26
7.2 Operation under restricted power conditions.26
7.2.1 Leakage current.26
7.2.2 Designated terminal functions.26
7.3 Method of designation .26
7.4 Visibility of designation.26
8 Physical modules.26
8.1 Handset.26
8.2 Audible alerting module.27
8.2.1 Sound pressure level .27
8.2.2 Alerting module control.27
8.2.2.1 Starting.27
8.2.2.2 Stopping .27
8.2.3 Adjustment of loudness .28
8.2.4 Adjustment of sound characteristics .28
9 Testing and approval methodology.28
Annex A (normative): Test specifications .29
A.1 General conditions for testing.29
A.1.1 Environment for tests.29
A.1.2 Power supply limitations.29
A.1.3 Test equipment interface.29
A.1.4 Test equipment requirements .29
A.1.4.1 Electro-acoustic equipment .29
A.1.4.2 Test equipment for digital telephone sets.29
A.1.4.2.1 Codec approach and specification.29
A.1.4.2.2 Direct digital processing approach.30
A.1.5 Alternative test methods .30
A.1.6 Accuracy of test measurements .31
A.1.7 Bandwidth.31
A.2 Transmission requirements testing.31

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ETS 300 085: December 1990
A.2.1 Sensitivity/frequency response .31
A.2.1.1 Sending. 31
A.2.1.2 Receiving.31
A.2.2 Loudness ratings.32
A.2.2.1 Sending Loudness Rating (SLR).32
A.2.2.2 Receiving Loudness Rating (RLR).32
A.2.3 Sidetone.32
A.2.3.1 Talker sidetone .32
A.2.3.2 Listener sidetone.33
A.2.4 Terminal coupling loss .33
A.2.4.1 Weighted terminal coupling loss.33
A.2.4.2 Stability Loss . 33
A.2.5 Distortion. 34
A.2.5.1 Sending. 34
A.2.5.1.1 Method 1 . 34
A.2.5.1.2 Method 2 . 35
A.2.5.2 Receiving. 35
A.2.5.2.1 Method 1 . 35
A.2.5.2.2 Method 2 . 35
A.2.5.3 Sidetone. 35
A.2.6 Variation of gain with input level.35
A.2.6.1 Sending. 35
A.2.6.2 Receiving.36
A.2.7 Out-of-band signals.36
A.2.7.1 Discrimination against out-of-band input signal.36
A.2.7.2 Spurious out-of-band signals .36
A.2.8 Noise .36
A.2.8.1 Sending. 36
A.2.8.2 Receiving.36
A.2.8.3 Level of sampling frequency (receiving).37
A.2.9 Acoustic shock.37
A.2.9.1 Continuous signal .37
A.2.10 Delay .37
A.3 Audible alerting module.38
A.3.1 Sound pressure level measurement .38
A.3.1.1 Measurement conditions .38
A.3.1.2 Measurement method.38
A.3.2 Alerting module control .39
A.3.2.1 Starting . 39
A.3.2.2 Stopping.39
Annex A Appendix A (informative): Test Report Format.40
A.A.1 Identification .40
A.A.1.1 Identification of the Document .40
A.A.1.2 Identification of the testing laboratory . 40
A.A.1.3 Identification of the client . 40
A.A.1.4 Identification of the test item .40
A.A.1.5 Use of subcontractors . 41
A.A.2 Test conditions. 41
A.A.3 Test equipment .41
A.A.4 Test results.41
A.A.4.1 Call control functions . 41
A.A.4.2 Speech transmission characteristics . 41
A.A.4.3 Loudspeaking or handsfree telephony.41
A.A.4.4 Power feeding . 42

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ETS 300 085: December 1990
A.A.4.5 Physical modules.42
A.A.4.6 Acoustic shock.42
A.A.5 Summary and conclusion.42
Annex B (informative): Availability of tone generation option.43
Annex B Appendix A: Belgian requirements for tones locally generated by digital telephone.44
B.A.1 Introduction.44
B.A.2 Characteristics of the tones.44
B.A.2.1 Dial tone.44
B.A.2.2 Ringing tone.44
B.A.2.3 Busy tone .44
B.A.2.4 Congestion tone.44
Annex B Appendix B: Finnish requirements for tones locally generated by a digital telephone.45
Annex B Appendix C: French requirements for tones generated by an ISDN digital telephone .46
B.C.1 Introduction.46
B.C.2 Dial tone.46
B.C.2.1 En-bloc sending.46
B.C.2.2. Overlap sending .46
B.C.3 Call routing tone .46
B.C.4 Ring-back tone.47
B.C.5 Busy tone / congestion tone / hang-up tone .47
B.C.6 Characteristics of the tones.47
B.C.7 Additional option.47
Annex B Appendix D: German requirements for tones locally generated by a digital telephone.48
B.D.1 General requirements .48
B.D.2 Dial tone.48
B.D.3 Special dial tone.49
B.D.4 Ringing tone.49
B.D.5 Busy tone .49
B.D.6 Congestion tone (path engaged indication) .49
Annex B Appendix E: Greek requirements for tones locally generated by a digital telephone.50
Annex B Appendix F: Italian requirements for tones generated by an ISDN digital telephone.51
B.F.1 Introduction.51
B.F.2 Characteristics of the tones.51
B.F.2.1 Connection not admitted indication.51
B.F.2.2 Number engaged indication (Busy tone) .51

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ETS 300 085: December 1990
B.F.2.3 Proceed indication (Dial tone).51
B.F.2.4 Awaiting answer indication (Ring back tone).51
B.F.2.5 Call waiting tone. 51
Annex B Appendix G: Portuguese requirements for tones locally generated by a digital telephone .52
Annex B Appendix H: Spanish requirements for tones generated by an ISDN telephony terminal in
response to the receipt of messages on the D-channel .53
B.H.1 Introduction.53
B.H.2 Characteristics of the tones.53
B.H.2.1 Dial tone. 53
B.H.2.2 Ringing tone.53
B.H.2.3 Busy tone. 53
B.H.2.4 Congestion tone. 53
B.H.2.5 Connexion not admitted indication (number unobtainable tone).53
B.H.2.6 Call waiting tone. 53
Annex B Appendix J: Swedish requirements for tones locally generated by a digital telephone .54
Annex B Appendix K: Swiss requirements for tones locally generated by a digital telephone.55
B.K.1 Introduction.55
B.K.2 Characteristics of the tones.55
B.K.3 Additional requirements.55
Annex B Appendix L: United Kingdom (UK) requirements for tones generated by an ISDN digital
telephony terminal in response to the receipt of messages on the D-channel . 56
B.L.1 Introduction.56
B.L.2 Call set-up tones. 56
B.L.2.1 Proceed indication (Dial tone).56
B.L.2.1.1 En-bloc sending.56
B.L.2.1.2 Overlap sending .56
B.L.2.2 Awaiting answer indication.57
B.L.3 Tones for unsuccessful calls.57
B.L.4 Characteristics of the tones.58
B.L.4.1 Connexion not admitted indication (Number unobtainable tone).58
B.L.4.2 Number engaged indication (Busy tone) .58
B.L.4.3 Path engaged indication (Congestion tone).58
B.L.4.4 Proceed indication (Dial tone).58
B.L.4.5 Awaiting answer indication (Ringing tone).58
History.59

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ETS 300 085: December 1990
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ETS 300 085: December 1990
Foreword
This European Telecommunication Standard (ETS) was produced by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI) and was adopted in
November 1990.
Annex A to this ETS is normative but Annex A, Appendix A and Annex B are informative.

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ETS 300 085: December 1990
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ETS 300 085: December 1990
1 Scope
This standard specifies the technical characteristics (electrical, logical and acoustic) for terminal equipment
for the 3,1 kHz telephony teleservice which can be connected to an ISDN basic access.
The requirements of this standard are additional to those of the standards for connection to the ISDN basic
access, and of any other standards to which the terminal equipment is subject.
This standard is applicable to simple telephony terminals as well as to the telephony function of multi-
function or multi-service terminals.
This standard is applicable to terminal equipment of the functional group defined as Terminal Equipment
Type l (TEl) in CCITT Recommendation I.411 [10] which supports the 3,1 kHz telephony teleservice.
This standard applies to apparatus for household, office and similar general indoor use.The terminal
includes all the functions necessary to provide real-time 2-way speech conversation. Where a function is
indicated as optional, it need not be provided, but where such a function is provided, the terminal shall
conform to the requirements and tests specified in this standard.
This standard is not applicable to:
a) terminal equipment specially designed for the disabled (e.g., with amplification of received speech
as an aid for the hard-of-hearing);
b) terminal equipment using a radio link (e.g., cordless telephones);
c) terminal equipment for hostile environments.
NOTE 1: This standard is applicable only to items of terminal equipment with an integral user-
network interface for ISDN basic access. Where an adaptor is used, other standards
may apply.
NOTE 2: In some countries, an interim ISDN service corresponding to, but not wholly compatible
with, the ISDN basic access standards may be provided. For connection to such
services, this standard is not applicable.
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These normative
references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to, or revisions of any of these publications apply to this ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] NET 3 part 1 : "Approval Requirements for Terminal Equipment to Integrated
Services Digital Network (ISDN) using ISDN Basic Access. Layers 1 and 2
Aspects." (First edition : 1988)
Part 2 : "Approval Requirements for Terminal Equipment to Integrated Services
Digital Network (ISDN) using ISDN Basic Access. Layer 3 Aspects."
[2] Draft prETS 300 012, "Integrated Services Digital Network (ISDN) ; Basic user-
network interface, Layer 1 specification and test principles."
[3] CCITT Recommendation G.101 (1988) "The transmission plan."
[4] CCITT Recommendation G.122 (1988), "Influence of national systems on
stability, talker echo, and listener echo in international connections."

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ETS 300 085: December 1990
[5] CCITT Recommendation G.223 (1988), "Assumptions for the calculations of
noise on hypothetical reference circuits for telephony."
[6] CCITT Recommendation G.701 (1988), "Vocabulary of digital transmission and
multiplexing, and Pulse Code Modulation (PCM) terms."
[7] CCITT Recommendation G.711 (1988), "Pulse Code Modulation (PCM) of voice
frequencies."
[8] CCITT Recommendation G.714 (1988), "Separate performance characteristics
for the send and receive sides of PCM channels applicable to 4-wire voice
frequency interfaces."
[9] CCITT Draft Recommendation I.241 (1988), "Teleservices supported by an
ISDN."
[10] CCITT Recommendation I.411 (1988) "ISDN user-network interfaces - reference
configurations."
[11] CCITT Recommendation O.131 (1988), "Specification for a quantizing distortion
measuring apparatus using a pseudo-random noise stimulus."
[12] CCITT Recommendation O.132 (1988), "Specification for a quantizing distortion
measuring apparatus using a sinusoidal test signal."
[13] CCITT Recommendation O.133 (1988), "Specification for equipment to measure
the performance of PCM encoders and decoders."
[14] CCITT Recommendation P.10 (1988), "Vocabulary of terms on telephone
transmission quality and telephone sets."
[15] CCITT Recommendation P.51 (1988), "Artificial mouths and artificial ears."
[16] CCITT Recommendation P.64 (1988), "Determination of sensitivity/frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings."
[17] CCITT Recommendation P.76 (1988), "Determination of loudness ratings;
fundamental principles."
[18] CCITT Recommendation P.79 (1988), "Calculation of loudness ratings."
[19] CCITT Blue Book (1988), Volume V, Supplement 13, "Noise spectra."
[20] IEC 318, "An artificial ear, of the wide band type, for the calibration of
earphones used in audiometry."
[21] IEC 651, "Sound level meters."
[22] ISO 3 - 1973, "Preferred numbers - series of preferred numbers."

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ETS 300 085: December 1990
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the relevant definitions and abbreviations in CCITT Recommendations P.10
[14] and G.701 [6] shall apply.
Acoustic reference level (ARL): the acoustic level which gives -10 dBmO at the digital interface.
Designated terminal: refers to the terminal which is permitted to draw power from power source 1 under
restricted power conditions as specified in draft prETS 300 012 [2].
Restricted Power Condition: the condition where the terminal has no other power source available than
power source 1 supplying the restricted power condition as specified in draft prETS 300 012 [2].
3,1 kHz telephony teleservice: a definition for telephony service is to be found in CCITT
Recommendation I.241 [9]. This definition corresponds to the term 3,1 kHz telephony teleservice used in
this standard.
NOTE: Work is currently being undertaken by ETSI to produce a stage 1 description of the 3.1
kHz telephony teleservice in the ISDN.
Terminal coupling loss (TCL): the frequency dependent coupling loss between the receiving port and the
sending port of a terminal due to :
- acoustical coupling at the user interface
- electrical coupling due to crosstalk in the handset cord or within the electrical circuits
- seismic coupling through the mechanical parts of the terminal
NOTE 1: The receiving port and the sending port of a digital voice terminal is a 0 dBr point.
NOTE 2: The coupling at the user interface depends on the conditions of use.
Weighted terminal coupling loss (TCLw) : the weighted TERMINAL COUPLING LOSS using the
weighting of CCITT Recommendation G. 122 [4].
3.2 Abbreviations
ARL Acoustic Reference Level
BC Bearer Capability
ERP Ear Reference Point
HLC High Layer Compatibility
ISDN Integrated Services Digital Network
LLC Low Layer Compatibility
L Sidetone path loss
meST
LRGP Loudness Rating Guard-ring Position
MFPB Multi Frequency Push Button
MRP Mouth Reference Point
TCL Terminal Coupling Loss
TCLw Weighted Terminal Coupling Loss
RLR Receiving Loudness Ratings
SLR Sending Loudness Ratings
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ETS 300 085: December 1990
4 Access channel selection
Access through any B-channel shall be possible. Channel allocation shall be in accordance with NET 3 [1].
The functional characteristics of the terminal shall be independent of the B-channel selected.
Compliance shall be tested by random choice of the B-channel during testing.
5 Call control functions
At least one of the following shall be implemented:
- outgoing calls
- incoming calls
All terminals shall have the capability to initiate call clearing in accordance with NET 3 [1].
5.1 Outgoing calls
Provision for outgoing calls is optional. If provided, subclauses 5.1.1 to 5.1.4 shall apply.
For terminal equipment only supporting outgoing calls, any incoming SETUP message shall be ignored.
5.1.1 Overlap and en-bloc sending
The terminal shall support the complete procedures for both overlap and en-bloc sending as specified in
NET 3 [1].
NOTE : The en-bloc procedure is recognised as the most appropriate for the ISDN, but the
overlap procedure is required in order to guarantee having also the dialling procedure
as for the analogue telephone (as far as the human interface is concerned).
5.1.2 Coding of Bearer Capability (BC) information element
When initiating an outgoing call on the 3,1 kHz telephony teleservice, the coding of the Bearer Capability
(BC) information element in the outgoing SETUP message shall be in conformance to figure 1.
8   7   6   5   4   3   2   1
�˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡        Bearer Capability        ‡
‡  0   0   0   0   0   1   0   0 ‡ Octet 1
‡     information element identifier     ‡
ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  0   0   0   0   0   0   1   1 ‡ Octet 2
‡     Length of information element     ‡
ˆ˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  1 ‡ 0   0  ‡ 0   0   0   0   0 ‡ Octet 3
‡    ‡  CCITT  ‡    Speech        ‡
ˆ˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  1 ‡ 0   0  ‡ 1   0   0   0   0 ‡ Octet 4
‡  Ext ‡Circuit Mode‡     64 kbit/s     ‡
ˆ˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  1 ‡ 0   1  ‡ 0   0   0   1   1 ‡ Octet 5
‡  Ext ‡ Layer 1  ‡    G.711 A-law     ‡
�˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 1: Coding of Bearer Capability (BC) information element indicating speech
Conformance to this requirement shall be checked using the test specified in NET 3 [1].

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ETS 300 085: December 1990
5.1.3 Coding of High Layer Compatibility (HLC) information element
The HLC information element for 3,1 kHz telephony teleservice is optional. When it is included in the
SETUP message it shall be encoded as specified by figure 2.
8   7   6   5   4   3   2   1
�˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡      High Layer Compatibility      ‡
‡ 0   1   1   1   1   1   0   1 ‡ Octet 1
‡    information element identifier     ‡
ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡ 0   0   0   0   0   0   1   0 ‡ Octet 2
‡     Length of information element     ‡
ˆ˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜·
‡ 1 ‡ 0   0 ‡ 1   0   0 ‡ 0   1 ‡ Octet 3
‡   ‡  CCITT  ‡   First   ‡ Protocol ‡
‡   ‡      ‡         ‡ Profile ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡       Telephony         ‡
‡ 1 ‡ 0   0   0   0   0   0   1 ‡ Octet 4
�˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 2: Coding of High Layer Compatibility information element indicating telephony
Conformance to this requirement shall be checked using the test specified in NET 3 [1].
NOTE: In accordance with ETS 300 102-1, the HLC is shown here as being optional. However,
it should be noted that in the future the HLC may become mandatory.
5.1.4 Coding of Low Layer Compatibility (LLC) information element
There should be minimal duplication between the BC information element and the LLC information element.
Nevertheless, if the LLC information element is included, as an option, in the SETUP message the LLC
shall be coded as shown in either figure 3 or figure 4.
8   7   6   5   4   3   2   1
�˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡   ‡     Low Layer Compatibility     ‡
‡ 0 ‡ 1   1   1   1   1   1  0 ‡ Octet 1
‡   ‡ information element identifier     ‡
ˆ˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡                        ‡
‡ 0   0   0   0   0   0   1  0 ‡ Octet 2
‡    Length of information element     ‡
ˆ˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Coding  ‡  Information Transfer   ‡
‡ 1 ‡ 0   0 ‡ 0   0   0   0  0 ‡ Octet 3
‡   ‡ Standard ‡  Capability = Speech   ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Transfer ‡  Information Transfer   ‡
‡ 1 ‡ 0   0 ‡ 1   0   0   0  0 ‡ Octet 4
‡   ‡  Mode = ‡   Rate = 64 kbit/s    ‡
‡   ‡ Circuit ‡               ‡
�˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 3: Coding of LLC information element indications speech

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ETS 300 085: December 1990
8   7   6   5   4   3   2   1
�˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡   ‡     Low Layer Compatibility     ‡
‡ 0 ‡ 1   1   1   1   1   1  0 ‡ Octet 1
‡   ‡   information element identifier   ‡
ˆ˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡                        ‡
‡ 0   0   0   0   0   0   1  1 ‡ Octet 2
‡     Length of information element     ‡
ˆ˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡  Coding ‡  Information Transfer   ‡
‡ 1 ‡ 0   0 ‡ 0   0   0   0  0 ‡ Octet 3
‡   ‡ Standard ‡  Capability = Speech   ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Transfer ‡  Information Transfer   ‡
‡ 1 ‡ 0   0 ‡ 1   0   0   0  0 ‡ Octet 4
‡   ‡  Mode = ‡   Rate = 64 kbit/s    ‡
‡   ‡ Circuit ‡               ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Layer 1 ‡ User info layer 1 protocol =‡
‡ 1 ‡ 0   1 ‡ 0   0   0   1  1 ‡ Octet 5
‡   ‡ Identity ‡ Recommendation G. 711 A-law ‡
�˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 4: Coding of LLC information element indications speech, CCITT Recommendation G.711 A-
law [7].
5.2 Incoming calls
Provision for incoming calls is optional. If provided the following subclauses apply.
5.2.1 Compatibility checking
The terminal shall perform compatibility check(s) in accordance with NET 3 [1].
Compliance with these requirements shall be checked using the tests specified in NET 3 [1].
NOTE 1: In association with the support of bearer services or teleservices other than 3,1 kHz
telephony, a multiservice terminal may accept as compatible incoming calls with BC,
HLC, and LLC information elements other than as specified in this section.
NOTE 2: In the future there are to be telephony terminals which require bearer capabilities other
than speech as well as HLC information element analysis, e.g., wideband (7 kHz)
telephony and narrowband videophone.
Interworking between such terminals and a 3,1 kHz telephony terminal is envisaged.
The interworking procedure is for further study.
Every incompatible incoming SETUP message may be responded to by sending a
RELEASE COMPLETE with cause #88 (incompatible destination) or may be ignored.

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ETS 300 085: December 1990
5.2.1.1 Coding of Bearer Capability (BC) information element
The terminal, in association with the support o
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