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7039b5c82545309841e61876569b2020 | 103 740 | 6.7.1 Attenuation Range in Send Direction during Double Talk AH,S,dt | Requirements Based on the level variation in send direction during double talk AH,S,dt the behaviour of the terminal can be classified according to table 6.7.1-1. The terminal should have full duplex capability (category 1). For desktop type terminals, category 1 shall be achieved. For handheld type terminals, category... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.7.2 Attenuation Range in Receive Direction during Double Talk AH,R,dt | Requirements Based on the level variation in receive direction during double talk AH,R,dt the behaviour of the terminal can be classified according to table 6.7.2-1. The terminal shall have full duplex capability (category 1). Table 6.7.2-1: Double talk categories for receive direction Category (according to Recommenda... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.7.3 Detection of echo components during double Talk | Requirement "Echo Loss" (EL) is the echo suppression provided by the terminal measured at the electrical reference point. Table 6.7.3-1: Echo loss during double talk categories Category (according to Recommendation ITU-T P.340 [10]) 1 2a 2b 2c 3 Full Duplex Capability Partial Duplex Capability No Duplex Capability Echo... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.7.4 Minimum activation level and sensitivity of double talk detection | For further study. ETSI ETSI TS 103 740 V1.4.1 (2021-10) 34 |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8 Switching parameters | |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8.0 Overview | Additional requirements may be needed in order to further investigate the effect of NLP implementations on the users' perception of speech quality. |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8.1 Activation in Send Direction | The activation in send direction is mainly determined by the built-up time Tr,S,min and the minimum activation level (LS,min). The minimum activation level is the level required to remove the inserted attenuation in send direction during idle mode. The built-up time is determined for the test signal burst which is appl... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8.2 Minimum activation level and sensitivity in Receive direction | For further study. |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8.3 Automatic level control | For further study. ETSI ETSI TS 103 740 V1.4.1 (2021-10) 35 |
7039b5c82545309841e61876569b2020 | 103 740 | 6.8.4 Silence Suppression and Comfort Noise Generation | For further study. |
7039b5c82545309841e61876569b2020 | 103 740 | 6.9 Background noise performance | |
7039b5c82545309841e61876569b2020 | 103 740 | 6.9.1 Performance in send direction in the presence of background noise | Requirement The level of comfort noise, if implemented, shall be within in a range of +2 dB and -5 dB compared to the original (transmitted) background noise. The noise level is calculated with A-weighting. NOTE 1: It is advisable that the comfort noise matches the original signal as good as possible (from a perception... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.9.2 Speech Quality in the Presence of Background Noise | Requirement Speech Quality for wideband systems shall be tested based on ETSI TS 103 106 [20]. The test method leads to three MOS-LQO quality numbers: • N-MOS-LQOw: Transmission quality of the background noise. • S-MOS-LQOw: Transmission quality of the speech. • G-MOS-LQOw: Overall transmission quality. For the backgro... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.9.3 Quality of Background Noise Transmission (with Far End Speech) | Requirement The test is carried out applying a speech signal in receive direction and comparing the noise level transmitted in the send direction under reference conditions with no far end speech, to the noise level transmitted in the send direction under test conditions including far end speech. During and after the e... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.10 Quality of echo cancellation | |
7039b5c82545309841e61876569b2020 | 103 740 | 6.10.1 Temporal echo effects | Requirements This test is intended to verify that the system will maintain sufficient echo attenuation during single talk. The measured echo attenuation during single talk shall not decrease by more than 6 dB from the maximum echo attenuation measured. Measurement method The test arrangement is according to clause 5.2.... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.10.2 Spectral Echo Attenuation | Requirement The echo attenuation vs. frequency shall be below the tolerance mask given in table 6.10.2-1. Table 6.10.2-1: Spectral echo loss limits Frequency Limit 100 Hz -41 dB 1 300 Hz -41 dB 3 450 Hz -46 dB 5 200 Hz -46 dB 7 500 Hz -37 dB 8 000 Hz -37 dB NOTE: The limit at intermediate frequencies lies on a straight... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.10.3 Occurrence of Artefacts | For further study. |
7039b5c82545309841e61876569b2020 | 103 740 | 6.10.4 Variable echo path | Requirement This test is intended to verify that the system will maintain sufficient echo attenuation during single talk with dynamic changing echo paths. The measured echo level over time during single talk shall not be more than 10 dB above the minimum noise level during the measurement. Measurement method The test s... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.11 Send and receive delay - round-trip delay | Requirement Send and receive delays are tested separately but the requirement is defined for the combination of send and receive delays (round-trip delay). It is recognized that the end-to-end delay should be as small as possible in order to ensure high quality of the communication. The round-trip delay Trtd (sum of se... |
7039b5c82545309841e61876569b2020 | 103 740 | 6.12 Void | 7 Codec dependent requirements and associated Measurement Methodologies |
7039b5c82545309841e61876569b2020 | 103 740 | 7.1 Speech Codecs | The present document is intended to be applicable for different speech codecs implemented in access networks. Table 7.1-1 defines a list of speech codecs implemented (non exhaustive). Table 7.1-1: List of speech codecs System Codec UMTS (WCDMA) AMR-WB (Recommendation ITU-T G.722.2) @12,65 kbit/s [17] VoLTE AMR-WB (Reco... |
7039b5c82545309841e61876569b2020 | 103 740 | 7.2 Void | |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3 Objective listening Quality in send and receive direction | |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3.0 Overview | The measurements of this clause are only applicable if the hands-free terminal supports at least one of the codecs listed in table 7.1-1. |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3.1 Objective listening speech quality MOS-LQO in send direction | The listening speech quality tests are conducted without any packet impairments (clean network conditions). Requirements The requirements for the listening speech quality according to table 7.3.1-1 apply. Table 7.3.1-1: Requirements for speech quality in send direction Speech codec MOS-LQOS (P.863) MOS-LQOM (TOSQA 2001... |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3.2 Objective listening quality MOS-LQO in receive direction | |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3.2.1 Jitter- and Error-Free Condition | The listening speech quality tests are conducted without any packet impairments (clean network conditions). Requirements The requirement for the listening speech quality and the delay under clean network conditions according to table 7.3.2.1-1 apply. ETSI ETSI TS 103 740 V1.4.1 (2021-10) 42 Table 7.3.2.1-1: Requirement... |
7039b5c82545309841e61876569b2020 | 103 740 | 7.3.2.2 Packet Impairments | The listening speech quality tests are conducted with simulated packet impairments. In addition to the listening speech quality tests, the delay is measured. The tests of this clause are only applicable to terminals providing an IP-based network access. Requirement The degradation between the error- and jitter-free con... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 1 Scope | The present document is intended to specify the one-to-one interface used for voice communications. It is intended for use in connecting products based on Multimedia Internet Keying Sakai-Kasahara Key Encryption (MIKEY-SAKKE) domains and to validate products. |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 2 References | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 3 Definition of terms, symbols and abbreviations | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 3.1 Terms | Void. |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 3.2 Symbols | Void. ETSI ETSI TS 103 816-2 V1.1.1 (2021-07) 7 |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: 3GPP 3rd Generation Partnership Project AEAD Authenticated Encryption with Associated Data AES Advanced Encryption Scheme BCAST Broadcast CS Crypto Session CSB Crypto Session Bundle CSB_ID Crypto Session Bundle IDentifier CS-ID Crypto Session ... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4 Overview of One-to-one Connections | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.1 One-to-one Interface | The present document defines the client interface between networks of Vendor Products. It defines two components: • The signalling channel used to setup the multimedia session. • The multimedia session itself. Initially only voice sessions shall be supported. Support for messaging, video and data sessions may be suppor... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.2 Use of the interface | It is anticipated that clients from different Vendor Products will not connect directly. Rather interoperability will occur by passing data between the independent Vendor Products networks via a Session Initialization Protocol (SIP) Trunk. The present document defines the data that will be passed between these networks... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.3 Communication Network | The present document assumes that signalling and session packets are to be routed between the Vendor Products networks. To provide this routing functionality, a SIP Trunk shall be used. The establishment of a client interface for Vendor Products will allow Vendor Products to establish shared infrastructure for inter-ne... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.4 Profiles | For signalling, the clients shall support a subset of SIP and Session Description Protocol (SDP), defined in the present document. For multimedia sessions, clients shall support Secure Real-time Protocol (SRTP). Clients should align with the Web Real-Time Communication (WebRTC) media profile defined in [9] as this will... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.5 One-to-one communications | Client Interfaces are end-points which wish to communicate with other clients and whose identity has been authenticated and provisioned by a technology which is compliant with ETSI TS 103 816-1 [1] and ETSI TS 103 816-5 [19]. No information need be exchanged between clients prior to communication except for identities.... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 4.6 Provisioning | It is assumed that all clients have been provisioned by a KMS. The process for provisioning is out-of-scope of the present document, however a mechanism has been specified within ETSI TS 133 179 [18]. It is also assumed that the initiating client has the KMS certificate for the domain of the receiving client, and the r... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 5 Inter-domain Interface | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 5.1 Setup | To securely communicate using Vendor Products each client of such Vendor Products shall be provisioned with keys corresponding to the client's MIKEY-SAKKE Unique Identifiers (UIDs), along with domain specific information. Generally, the client will perform a registration process (e.g. SIP REGISTER) with the home networ... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 5.2 Signalling Flow | Figure 2 shows the basic set-up procedure for the creation of a communication between clients of Vendor Products. Figure 2: Setup procedure for client-to-client communications The procedure in Figure 2 is now described step-by-step: 1) Prior to beginning this procedure it is assumed that the clients of Vendor Products ... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6 Signalling Profile | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.1 SIP Profile | The clients shall use SIP as defined in IETF RFC 3261 [12]. The following sections define the subset of SIP which shall be used for Vendor Products. |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.2 SIP Requests | The client shall support the following SIP requests: • INVITE • ACK • CANCEL • OPTIONS • BYE |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.3 SIP INVITE | SIP INVITEs shall be addressed to a SIP URI including the domain of the user. The SIP INVITE message shall include an SDP Offer message which shall include a MIKEY message, specifically a MIKEY-SAKKE I_MESSAGE. |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.4 SIP Responses | Clients shall support the following responses (as defined in Section 21 of IETF RFC 3261 [12]): • Trying • Ringing • OK • Not found • Temporarily not available • Busy here • Server internal error • Decline NOTE: It was originally proposed that the SIP OK (200) responses may include an SDP Answer message which may inclu... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.5 SDP Profile | The clients shall use SDP as defined in IETF RFC 4566 [4]. Clients should follow the Voice-over-Long-Term- Evolution (VoLTE) profile defined in ETSI 124 371 [11]. MIKEY-SAKKE messages shall be included using the "key-mgmt" SDP extension defined in IETF RFC 4567,[13]. |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.6 Supported SDP Fields | The following SDP fields shall be supported: • Codec (audio) • IP • Port • key-mgmt (mikey) Clients shall not use the SDP key field (''k='') defined in IETF RFC 4566 [4]. Clients shall not use the security descriptions field (''a=crypto'') defined in IETF RFC 4568 [8]. Only the MIKEY protocol shall be used within the '... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 6.7 MIKEY Profile | The SDP offer shall include a MIKEY-SAKKE I_MESSAGE defined as in IETF RFC 6509 [5] (containing the fields HDR, T, RAND, [IDRi], [IDRr], [IDRkmsi], [IDRkmsr], [CERT], {SP}, SAKKE, SIGN as described in that document) but with the following clarifications and modifications: • The HDR payload shall be the first MIKEY payl... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 7 SRTP Profile | |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 7.1 Media Profile | All clients shall support the RTP/ Secure Audio-Visual Profile with Feedback (SAVPF) Profile as defined in IETF RFC 5124 [10]. Real-Time Control Protocol (RTCP)/ Secure Real-Time Control Protocol (SRTCP) may be supported. Clients shall establish a SRTP session, as defined in IETF RFC 3711 [2]. Clients shall ignore unkn... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 7.2 Security Profiles | Clients shall use the SRTP encryption profile "AEAD_AES_128_GCM" as defined in IETF RFC 7714 [6] as the default SRTP security profile. See Annex A for further details. The Key Derivation Function shall be applied on the 12-byte salt provided by AES-GCM without any additional padding. NOTE: The interpretation of Master ... |
8adb0708b3ae9078677f893507d94ae2 | 103 816-2 | 7.3 Audio Codecs | Where a client supports audio communications, the client shall support the following audio codec: • Opus as defined in IETF RFC 6716 [7]. Additional codecs may be supported and a given network may operate solely using these additional codecs but Opus is the codec used for proving interoperability of two or more Vendor ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 1 Scope | The present document provides speech transmission performance requirements for wireless terminals; it addresses several types of mobile wireless terminals, including softphones. The present document addresses hands-free functionality of narrowband wireless terminals. Test methods and performance requirements apply (but... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 2 References | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 2.1 Normative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which a... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 2.2 Informative references | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks i... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 3 Definitions of terms, symbols and abbreviations | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 3.1 Terms | For the purposes of the present document, the following terms apply: artificial ear: device for the calibration of earphones incorporating an acoustic coupler and a calibrated microphone for the measurement of the sound pressure and having an overall acoustic impedance similar to that of the median adult human ear over... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 3.2 Symbols | Void. |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 3.3 Abbreviations | For the purposes of the present document, the following abbreviations apply: a.c. alternative current AH,S,dt attenuation range in send direction during double talk AM-FM Amplitude Modulation Frequency Modulation AMR Adaptive Multi-Rate codec CS Composite Source CSS Composite Source Signal DECT Digital Enhanced Cordles... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 4 Void | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5 Test Configurations | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.1 Set-up interface | The generic schematic as defined in figure 5.1-1 is applicable to any wireless link. NOTE: The "whole" terminal includes all the components from "RF interface" to the transducers and may include an additional (radio) link. The air interface considered in figure 5.1-1 is not the additional radio link. Figure 5.1-1: Set-... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2 Set-up for terminals | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.0 General | For electroacoustical testing, HATS as described in Recommendation ITU-T P.58 [10] shall be used, which is equipped with a mouth simulator and two artificial ears. In general, most measurements described in the present document can be conducted with one artificial ear. However, for some measurements, the usage of both ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.1 Handheld terminal | HATS measurement equipment shall be configured to the handheld hands-free UE according to figure 5.2.1-1. The HATS should be positioned so that the HATS Reference Point is at a distance dHF from the centre point of the visual display of the Mobile Station. The distance dHF is specified by the manufacturer. A vertical a... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.2 Vehicle mounted hands-free | Test arrangement, test methods and performance requirements are according to Recommendation ITU-T P.1100 [i.2]. Figure 5.2.2-1: Void ETSI ETSI TS 103 738 V1.4.1 (2021-10) 13 |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.3 Desktop hands-free terminal | Definition of hands-free terminals and setup for desktop hands-free terminals are based on Recommendation ITU-T P.581 [16]. Figure 5.2.3-1: Position for test of desktop hands-free terminal side view Figure 5.2.3-2: Position for test of desktop hands-free terminal top sight |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.4 Additional test setup for hands-free function with softphone | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.4.0 General | Two types of softphones are to be considered: • Type 1 is to be used as a desktop type (e.g. notebook). • Type 2 is to be used as a handheld type (e.g. PDA). When manufacturer gives conditions of use, they will apply for test. If no other requirement is given by manufacturer softphone will be positioned according the f... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.4.1 Softphone including speakers and microphone | Figure 5.2.4.1-1: Configuration of softphone relative to the HATS side view Figure 5.2.4.1-2: Configuration of softphone relative to the HATS-top sight ETSI ETSI TS 103 738 V1.4.1 (2021-10) 15 |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.4.2 Softphone with separate speakers | When separate loudspeakers are used, system will be positioned as in figure 5.2.4.2-1. Figure 5.2.4.2-1: Configuration of softphone using external speakers relative to the HATS-top sight When external microphone and speakers are used, system will be positioned as in figure 5.2.4.2-2. Figure 5.2.4.2-2: Configuration of ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.2.5 Test setup for variable echo path | Test setup for desktop hands-free terminals: A notebook is positioned at least 20 cm in front of the device (or devices) with the transducers, as shown in figure 5.2.5-1. The notebook lid is moved during the measurement. > 20cm Figure 5.2.5-1: Positioning of DUT Test setup for softphone: The test setup is described in ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.3 Acoustical environment | In general, different acoustical environments have to be taken into account: either room noise and background noise are an inherent part of the test environment or room noise and background noise shall be eliminated to such an extent that their influence on the test results can be neglected. Unless stated otherwise mea... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.4 Test signals | Modern wireless terminals often deploy non linear and time-varying processing. As such terminals are designed for speech transmission, the most appropriate test signal is real speech. Appropriate test signals (general description) are defined in Recommendation ITU-T P.501 [14]. For testing the narrowband telephony serv... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.5 Calibration | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.5.1 Send | Unless specified otherwise, the test signal level shall be -4,7 dBPa at the MRP. The various steps for calibration of the artificial mouth are described in Recommendation ITU-T P.581 [16]. The spectrum of acoustic signal produced by the artificial mouth is equalized under freefield conditions at the MRP. The test setup... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.5.2 Receive | Unless specified otherwise, the applied test signal level at the digital input shall be -16 dBm0, measured according to Recommendation ITU-T P.56 [9] at the digital reference point or the equivalent analogue point. All measurement values produced by HATS are intended to be free-field equalized according Recommendation ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.5.3 Setup of background noise simulation | A setup for simulating realistic background noises in a lab-type environment is described in ETSI TS 103 224 [25]. ETSI TS 103 224 [25] contains a description of the recording arrangement for realistic background noises, a description of the setup for a loudspeaker arrangement suitable to simulate a background noise fi... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.6 Environmental conditions for tests | The following conditions shall apply for the testing environment: a) Ambient temperature: 15 °C to 35 °C (inclusive); b) Relative humidity: 5 % to 85 %; c) Air pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar). |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.7 Accuracy of test equipment | Unless specified otherwise, the accuracy of measurements made by test equipment shall be better than: Table 5.7-1: Accuracy of measurements Item Accuracy Electrical Signal Level Electrical Signal Level Sound pressure Frequency Time Measured maximum frequency Clock Accuracy ±0,2 dB for levels ≥ -50 dBV ±0,4 dB for level... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.8 Power feeding conditions | For terminal equipment, which is directly powered from the mains supply, all tests shall be carried out within ±5 % of the rated voltage of that supply. If the equipment is powered by other means and those means are not supplied as part of the apparatus, all tests shall be carried out within the power supply limit decl... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 5.9 Influence of terminal delay on measurements | As delay is introduced by the terminal, care shall be taken for all measurements where exact position of the analysis window is required. It shall be checked that the test is performed on the test signal and not any other signal. 6 Codec independent Requirements and associated Measurement Methodologies |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1 Send and receive frequency response | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.1 Send frequency response | Requirement The send sensitivity frequency response from the MRP to the measurement output (digital or analogue output according measurement system used) shall be within the mask which can be drawn with straight lines between the breaking points in table 6.1.1-1 on a logarithmic (frequency) - linear (dB sensitivity) sc... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.2 Receive frequency response | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.2.1 Handheld terminal | Requirement The receive sensitivity frequency response from the measurement input (digital or analogue input according measurement system used) to ear of HATS free field corrected shall be within the mask which can be drawn with straight lines between the breaking points in table 6.1.2.1-1 on a logarithmic (frequency) ... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.2.2 Void | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.2.3 Softphone (computer-based terminals) | Requirements Type 1 or softphone with external speakers: The requirement as for desktop terminal shall apply. Type 2: The requirement as for handheld terminal shall apply. ETSI ETSI TS 103 738 V1.4.1 (2021-10) 23 |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.1.2.4 Desktop Terminal | Requirement The receive sensitivity frequency response from the measurement input (digital or analog input according measurement system used) to ear of HATS freefield corrected shall be within the mask which can be drawn with straight lines between the breaking points in table 6.1.2.4-1 on a logarithmic (frequency) - l... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2 Send and receive loudness ratings | |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2.1 Send Loudness Ratings | Requirement The nominal values of SLR shall be: SLR = +13 ± 3 dB Measurement method The test signal to be used for the measurements shall be the British-English single talk sequence described in clause 7.3.2 of Recommendation ITU-T P.501 [14]. The terminal is set up as described in clause 5.2 and calibration is realize... |
5f58bd61f1d47a1156ca1080618be812 | 103 738 | 6.2.2 Microphone (Mic) mute | Requirement The SLR (Send Loudness Rating) with mic mute on shall be at least 50 dB higher than with mic mute off. Measurement method The terminal will be positioned as described in clause 6.2.1, but its microphone shall be configured to be muted. Measurement and calculation method are the same as in clause 6.2.1. |
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