1、 International Telecommunication Union ITU-T H.248.17TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Line test packages Recommendation ITU-T H.248.17 ITU-T
2、H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.240H.259Coding o
3、f moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Supple
4、mentary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.
5、529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MUL
6、TIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.
7、720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, please refer to the list of ITU-T Recommendati
8、ons. Rec. ITU-T H.248.17 (03/2013) i Recommendation ITU-T H.248.17 Gateway control protocol: Line test packages Summary Recommendation ITU-T H.248.17 describes line test components and how they are used across an MGC/MG ITU-T H.248.1 interface to complete line tests. This revision incorporates a cor
9、rection to an incorrect signal identity in clause 8.3.1.2. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248.17 2002-11-29 16 1.1 ITU-T H.248.17 (2002) Cor. 1 2004-03-15 16 2.0 ITU-T H.248.17 2013-03-16 16 ii Rec. ITU-T H.248.17 (03/2013) FOREWORD The International Telecommunicatio
10、n Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questi
11、ons and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations
12、on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, th
13、e expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or ap
14、plicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance wit
15、h the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or appli
16、cability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to imple
17、ment this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2014 All rights reserved. No part of this publication may be reproduced, by any me
18、ans whatsoever, without the prior written permission of ITU. Rec. ITU-T H.248.17 (03/2013) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Test system architecture and flows . 2 6 Line test components 4 6.1 Common line tests components for ANSI,
19、ITU-T and TTC 4 6.2 ITU-T line tests components 6 6.3 ANSI line test components . 13 6.4 TTC line test components . 17 7 Line test procedures at the testing switching centre . 18 7.1 ITU-T 18 7.2 ANSI . 19 7.3 TTC line tests . 20 8 Line test procedures at the testee switching centre . 20 8.1 ITU-T 2
20、0 8.2 ANSI . 21 8.3 TTC line tests . 22 Rec. ITU-T H.248.17 (03/2013) 1 Recommendation ITU-T H.248.17 Gateway control protocol: Line test packages 1 Scope This Recommendation describes line test components and how they are used to complete line tests. The definition of line test components, rather t
21、han of complete line tests, allows the media gateway controller (MGC) and media gateway (MG) to implement a minimal set of signals and packages to achieve a larger set of line tests. It is assumed that the media gateway controller is responsible for sequencing and timing of the line test components
22、to complete the relevant line tests. The detailing of results that are reported (e.g., events and statistics), as well as the timing and mechanisms used for transmitting such records from the MG to the MGC, are outside the scope of this Recommendation. 2 References The following ITU-T Recommendation
23、s and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore e
24、ncouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone
25、 document, the status of a Recommendation. ITU-T G.711 Recommendation ITU-T G.711 (1988), Pulse code modulation (PCM) of voice frequencies. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3. ITU-T O.6 Recommendation ITU-T O.6 (1988), 1020 Hz reference test freque
26、ncy. ITU-T O.11 Recommendation ITU-T O.11 (1992), Maintenance access lines. ITU-T O.22 Recommendation ITU-T O.22 (1992), CCITT automatic transmission measuring and signalling testing equipment ATME No. 2. ITU-T O.152 Recommendation ITU-T O.152 (1992), Error performance measuring equipment for bit ra
27、tes of 64 kbit/s and N 64 kbit/s. ITU-T Q.107 Recommendation ITU-T Q.107 (1988), Standard sending sequence of forward address information. ITU-T Q.551 Recommendation ITU-T Q.551 (2002), Transmission characteristics of digital exchanges. ITU-T Q.1950 Recommendation ITU-T Q.1950 (2002), Bearer indepen
28、dent call bearer control protocol. ANSI T1.206*ANSI T1.206-1994, Digital exchanges and PBXs Digital circuit loopback test line with NxDS0 capability. _ *T1 standards are maintained since November 2003 by ATIS. 2 Rec. ITU-T H.248.17 (03/2013) ANSI T1.207* ANSI T1.207-2000, Operations, Administration,
29、 Maintenance and Provisioning (OAM request the MG via signal “itult2804/tt2804hz_10“ to initiate a tone. 7.1.2.3 Signal-to-total-distortion ratio measurements clause 3.3 of ITU-T O.22 To provide the procedures of clause 3.3.1 of ITU-T O.22 over an MCG/MG interface, the MGC at the access point at the
30、 input to the path to be measured shall request the MG via the signal “itult1020/tt1020hz“, to initiate tones for Signal-total-distortion ratio measurement. 7.1.2.4 Echo canceller testing system clause 3.4 of ITU-T O.22 These tests may be achieved through normal call establishment procedures between
31、 the MGC and MG. The use of echo cancellation equipment may be specified as per clause E.13.1 of ITU-T H.248.1. The clauses below specify the behaviour of individual tests. 7.1.2.4.1 Absolute power level measurements clause 3.4.1 of ITU-T O.22 To provide the procedures of clause 3.4.1 of ITU-T O.22
32、over an MCG/MG interface, the MGC at the access point at the input to the path to be measured shall request the MG via the signals, “itult1020/tt1020hz“, “itultdis/tt2100hz_dis“, “itultdisecd/tt2100hz_disecd“, “itult2804/tt2804hz_10“, “itultntt/noise“ to initiate tones of the indicated frequencies.
33、7.1.2.4.2 Noise measurements clause 3.4.2 of ITU-T O.22 As per clause 7.1.2.2. 7.1.2.4.3 Echo performance ratio measurements clause 3.4.3 of ITU-T O.22 To provide the procedures of clause 3.4.3 of ITU-T O.22 over an MCG/MG interface, the MGC at the access point at the input to the path to be measure
34、d shall request the MG, via the signals “itultntt/ttnoise“, to initiate noise test signal. Rec. ITU-T H.248.17 (03/2013) 19 7.1.2.5 Digital test pattern tests to a digital loopback test line clause 3.5.1 of ITU-T O.22 To provide the procedures of clause 3.5.1 of ITU-T O.22 over an MCG/MG interface,
35、the MGC at the access point at the input to the path to be measured shall request the MG, via the signals “itultdprt/ttrandom“, to initiate pseudo-random digital test signal. At the access point where the loopback is to be initiated, the procedures of clause 8.1.1.5 apply. 7.1.2.6 Transmission tests
36、 to a digital loopback test line clause 3.5.2 of ITU-T O.22 To provide the procedures of clause 3.5.2 of ITU-T O.22 over an MCG/MG interface, the MGC at the access point at the input to the path to be measured shall request the MG, via the signals “itult404/tt404hz_10“, “itult1020/tt1020hz“, “itultd
37、is/tt2100hz_dis“, “itultdisecd/tt2100hz_disecd“ or “itult2804/tt2804hz_10“, to initiate tones of the indicated frequency. At the access point where the loopback is to be initiated, the procedures of clause 8.1.1.5 apply. 7.2 ANSI 7.2.1 100-type test lines Quiet termination clause 5.1.1.1 of ANSI T1.
38、207 This line test procedure is used in a responding role, see clause 8.2.1. 7.2.2 100-type test lines 1000 Hz (milliwatt) Test tone clause 5.1.1.2 of ANSI T1.207 This line test procedure is used in a responding role, see clause 8.2.2. 7.2.3 101-type test line Communications clause 5.1.2 of ANSI T1.
39、207 These tests may be achieved through normal call establishment procedures between the MGC and MG. No line test components are used. 7.2.4 102-type test line Milliwatt clause 5.1.3 of ANSI T1.207 This line test procedure is used in a responding role, see clause 8.2.4. 7.2.5 104-type test line clau
40、se 5.1.4 of ANSI T1.207 Not applicable to the MGC/MG interface as test pads are contained in a remote office. 7.2.6 105-type test line Automatic transmission measuring clause 5.1.5 of ANSI T1.207 This line test procedure is used in a responding role, see clause 8.2.6. 7.2.7 107-type line test Data t
41、ransmission test line clause 5.1.6 of ANSI T1.207 These tests may be achieved through normal call establishment procedures between the MGC and MG. No line test components are used. 7.2.8 109-test line Echo canceller testing clause 5.17 of ANSI T1.207 This line test procedure is used in a responding
42、role, see clause 8.2.8. 7.2.9 108-type test line Digital non inverting loop-back clause 5.2.1 of ANSI T1.207 To provide the procedures of clause 5.2.1 of ANSI T1.207 over an MGC/MG interface at a testing switching centre, the MGC shall request the MG via the signal ansi/digtestsig in an AMM command,
43、 to initiate the digital test signals. 7.2.10 606-type test line Digital inverting loop-back clause 5.2.2 of ANSI T1.207 No line test procedures are used as digital tests are performed by test set. 7.2.11 Operational line tests clause 5.3 of ANSI T1.207 These tests may be achieved through normal cal
44、l establishment procedures between the MGC and MG. No line test components are used. 20 Rec. ITU-T H.248.17 (03/2013) 7.3 TTC line tests See clause 8.3 for testee procedures. 8 Line test procedures at the testee switching centre The MGC may determine the relevant line test to perform according to th
45、e forward addressing information provided by the appropriate signalling system. The MGC is responsible for implementing the delays between the receipt of off hook and the generation of signals. The MGC is also responsible for implementing periodic interruptions to line tests. 8.1 ITU-T 8.1.1 Test li
46、ne types according to Recommendation ITU-T O.11 8.1.1.1 Quiet termination test line clause 1.2/O.11 To provide the procedures of clause 1.2 of ITU-T O.11 over an MGC/MG interface, the MGC shall request the MG, via the signal “itult1020/tt1020hz“ in an AMM command, to initiate a 1020 Hz tone. After 1
47、3-15 seconds, the MGC shall then request the MG, via the signal “qtlt/quietterm“, to initiate a quiet termination. When the calling party disconnects, the MGC shall remove any the “qtlt/quietterm“ signal. 8.1.1.2 Test and/or communications access line clause 1.3 of ITU-T O.11 These tests may be achi
48、eved through normal call establishment procedures between the MGC and MG. No line test components are used. 8.1.1.3 Echo suppressor test line clause 1.4 of ITU-T O.11 FFS. 8.1.1.4 Analogue loopback test line clause 1.5.1 of ITU-T O.11 To provide the procedures of clause 1.5.1 of ITU-T O.11 over an M
49、GC/MG interface, the MGC shall request the MG, via the signal “itult1020/tt1020hz“ in an AMM command, to initiate a 1020 Hz tone. After 13-15 seconds, the MGC shall then request the MG, via the signal “qtlt/quietterm“ in a MM command, to initiate a quiet termination. After another 13-15 seconds, the MGC shall request the MG, via the signal “lltr/loopback“, to loopback the local and remote (“GO“ and “RETURN“) sides of t
