1、 International Telecommunication Union ITU-T H.248.42TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (05/2006) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: DCME interworking package ITU-T Recommendation H.248.42
2、 ITU-T 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.259
3、Coding of 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.36
4、9 Supplementary 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
5、 H.520H.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.559Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-PLAY MULTIM
6、EDIA SERVICES Broadband multimedia services over VDSL H.610H.619 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. H.248.42 (05/2006) i ITU-T Recommendation H.248.42 Gateway control protocol: DCME interworking package Summary The DCME Package is used for interfacing
7、Digital Circuit Multiplication Equipment (DCME). DCME types are for instance defined by ITU-T Recs G.763, G.767 or G.768. There is a signalling interface defined between DCME and a so-called “International Switching Centre“ (ISC). ITU-T Rec. Q.50 defines such an interface. The DCME Package scopes DC
8、ME with Q.50 interfaces. Source ITU-T Recommendation H.248.42 was approved on 29 May 2006 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.248.42 (05/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agen
9、cy in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide
10、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 on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Re
11、solution 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, the expression “Administration“ is used for conciseness to indicate both a telecommunication administrati
12、on 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 applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions ar
13、e 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 with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the po
14、ssibility 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 applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of th
15、e 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 implement this Recommendation. However, implementors are cautioned that this may not represent the latest info
16、rmation and are therefore strongly urged to consult the TSB patent database. ITU 2006 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. H.248.42 (05/2006) iii CONTENTS Page 1 Scope 1 2 References. 2 2.
17、1 Normative references 2 2.2 Informative references 2 3 Terms and definitions . 2 4 Abbreviations 3 5 DCME interworking package. 4 5.1 Properties 4 5.2 Events . 4 5.3 Signals 9 5.4 Statistics 12 5.5 Error codes 12 5.6 Procedures 12 ITU-T Rec. H.248.42 (05/2006) 1 ITU-T Recommendation H.248.42 Gatewa
18、y control protocol: DCME interworking package 1 Scope The DCME Package is used for interfacing Digital Circuit Multiplication Equipment (DCME). DCME types are for instance defined by ITU-T Recs G.763 7, G.767 9 or G.768 10. There is a signalling interface defined between DCME and a so-called “Intern
19、ational Switching Centre“ (ISC). ITU-T Rec. Q.50 3 defines such an interface. The DCME Package scopes DCME with Q.50 interfaces (see Figure 1). NOTE 1 Relation to PCME 8: the DCME package may be applied in principles as well for PCME types with Q.50-based CME signalling and E1/PDH trunk interface ty
20、pes. The final decision is still for further studies, e.g., due to dependencies with still open clause 19/G.765 8 on dynamic load control. NOTE 2 Relation to IP-CME 11: the DCME package may be applied for IP-CME types with Q.50-based CME signalling and E1/PDH trunk interface types. Other trunk facil
21、ities are for further studies. Figure 1/H.248.42 Scope of the DCME Package The DCME Package must support DCME-ISC signalling interface functions. The required Package capabilities may be summarized by following overview from ITU-T Recs G.763 and Q.50. There are three major groups of functions: Trans
22、mission resource management Facilitates the dynamic load control process within the ISC and the DCME concurrently, based on the status of the traffic loading on the DCME system. Seizure/release of 64 kbit/s circuits Used in the DCME for the generation of internal assignment and disconnection message
23、s and in the ISCs for the validation of circuit seizure selection/release based on acknowledgement from the DCME. 2 ITU-T Rec. H.248.42 (05/2006) Maintenance information Facilitates information exchange between the DCME and the ISCs pertaining to the maintenance status. Maintenance status informatio
24、n may be exchanged between the DCME and the ISC. 2 References 2.1 Normative references The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated w
25、ere valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged 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 Recommen
26、dations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 1 ITU-T Recommendation H.248.1 (2005), Gateway control protocol: Version 3. 2 ITU-T Recommendation H.248.8 (2005), Gateway control proto
27、col: Error code and service change reason description. 3 ITU-T Recommendation Q.50 (2001), Signalling between Circuit Multiplication Equipment (CME) and International Switching Centres (ISC). 4 ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736
28、kbit/s hierarchical levels. 2.2 Informative references 5 ITU-T Recommendation Q.50.1 (2001), Signalling between International Switching Centres (ISC) and Digital Circuit Multiplication Equipment (DCME) including the control of compression/decompression. 6 ITU-T Recommendation G.726 (1990), 40, 32, 2
29、4, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM). 7 ITU-T Recommendation G.763 (1998), Digital circuit multiplication equipment using G.726 ADPCM and digital speech interpolation. 8 ITU-T Recommendation G.765 (1992), Packet circuit multiplication equipment. 9 ITU-T Recommendation G.7
30、67 (1998), Digital circuit multiplication equipment using 16 kbit/s LD-CELP, digital speech interpolation and facsimile demodulation/remodulation. 10 ITU-T Recommendation G.768 (2001), Digital circuit multiplication equipment using 8 kbit/s CS-ACELP. 11 ITU-T Recommendation G.769/Y.1242 (2004), Circ
31、uit multiplication equipment optimized for IP-based networks. 3 Terms and definitions None. ITU-T Rec. H.248.42 (05/2006) 3 4 Abbreviations This Recommendation uses the following abbreviations: 2PTY Two-Party 3PTY Three-Party C2C Circuit-to-Circuit C2P Circuit-to-Packet CAS Channel Associated Signal
32、ling CME Circuit Multiplication Equipment CSN Circuit-Switched Network DCME Digital Circuit Multiplication Equipment DS Dual Seizure IP-CME CME optimized for IP-based networks ISC International Switching Centre MG Media Gateway MGC Media Gateway Controller MPTY Multiparty NGN Next-Generation Network
33、 NROR No Response On Release P2P Packet-to-Packet PCM Pulse Code Modulation PCME Packet Circuit Multiplication Equipment PSN Packet-Switched Network RDSD Remote DCME Signalling Disabled SNOT Seizability NOT yet enabled TDM Time Division Multiplexing TRM Transmission Resource Management TS Time-slot
34、UKLS UnKnown Line State 4 ITU-T Rec. H.248.42 (05/2006) 5 DCME interworking package Package Name: DCME Interworking package PackageID: dcme (0x0x009e) Description: This package defines the H.248 signals and events for a decomposed International Switching Centre (ISC) following ITU-T Rec. Q.50 3. The
35、 intention of this package is to be independent of ITU-T Rec. Q.50 Annexes A and B implementation. The H.248 MG provides PCM30 ITU-T Rec. G.704 4 compliant 2 Mbit/s interface(s), whereas time-slot 16 is used to carry the ISC-DCME signalling protocol. The “term PCM30“ is defined in 3.1/H.248.33. Vers
36、ion: 1 Extends: None 5.1 Properties 5.1.1 DCME protocol Property Name: DCME Protocol PropertyID: cmeprotocol (0x0001) Description: The specific protocol (ISC DCME) supported for a 2 Mbit/s interface. Note that the MG shall provision this property for the physical termination representing time-slot 1
37、6. For the other physical terminations of the 2 Mbit/s interface, this is optional. Type: Enumeration Possible values: “None“ (0x0001) “Q50AnnexA“ (0x0002) “Q50AnnexB“ (0x0003) Default: Provisioned Defined in: TerminationState Characteristics: read 5.2 Events 5.2.1 No trunk(s) available for 3.1 kHz
38、audio or speech Event Name: Trunk unavailable EventID: tunav (0x0001) Description: Generated when no bearer capacity for additional 3.1 kHz audio or speech trunk(s) is available. This event is used by the DCME transmission resource management (TRM). 5.2.1.1 EventDescriptor parameters None. 5.2.1.2 O
39、bservedEventsDescriptor parameters None. ITU-T Rec. H.248.42 (05/2006) 5 5.2.2 No channels(s) available for 3.1 kHz Event Name: Channel unavailable EventID: cunav (0x0002) Description: Generated when no bearer capacity for additional 3.1 kHz channel(s) is available. This event is used by the DCME tr
40、ansmission resource management (TRM) to retain backward compatibility only and is not to be used in implementations based on 1993 or later versions of ITU-T Rec. Q.50. 5.2.2.1 EventDescriptor parameters None. 5.2.2.2 ObservedEventsDescriptor parameters None. 5.2.3 Trunk(s) available for 3.1 kHz audi
41、o or speech Event Name: Trunk available EventID: tav (0x0003) Description: Generated to notify the end of “No trunk available for 3.1 kHz audio or speech“ condition. This event is used by the DCME transmission resource management (TRM). 5.2.3.1 EventDescriptor parameters None. 5.2.3.2 ObservedEvents
42、Descriptor parameters None. 5.2.4 No 64 kbit/s capacity available Event Name: 64 kbit/s capacity unavailable EventID: kb64Unav (0x0004) Description: Generated when no 64 kbit/s capacity is available, i.e., only bearer capabilities for speech and 3.1 kHz audio are available. This event is used by the
43、 DCME transmission resource management (TRM). 5.2.4.1 EventDescriptor parameters None. 5.2.4.2 ObservedEventsDescriptor parameters None. 5.2.5 Trunk(s) available for 64 kbit/s Event Name: 64 kbit/s capacity available EventID: kb64Av (0x0005) Description: Generated to notify the end of “No 64 kbit/s
44、capacity available“ overload condition, i.e., all bearer capabilities are available thus corresponds to DCME normal operation. This event is used by the DCME transmission resource management (TRM). 6 ITU-T Rec. H.248.42 (05/2006) 5.2.5.1 EventDescriptor parameters None. 5.2.5.2 ObservedEventsDescrip
45、tor parameters None. 5.2.6 64 kbit/s positive acknowledgement Event Name: 64 kbit/s positive acknowledgement EventID: kb64PosAck (0x0006) Description: Generated upon a positive acknowledgement is received from DCME equipment due to a previously sent 64 kbit/s request. This event is used by the DCME
46、bearer service selection. 5.2.6.1 EventDescriptor parameters None. 5.2.6.2 ObservedEventsDescriptor parameters None. 5.2.7 64 kbit/s negative acknowledgement Event Name: 64 kbit/s negative acknowledgement EventID: kb64NegAck (0x0007) Description: Generated upon a negative acknowledgement is received
47、 from DCME equipment due to a previously sent 64 kbit/s request. This event is used by the DCME bearer service selection. 5.2.7.1 EventDescriptor parameters None. 5.2.7.2 ObservedEventsDescriptor parameters None. 5.2.8 Release 64 kbit/s positive acknowledgement Event Name: Release 64 kbit/s positive
48、 acknowledgement EventID: kb64RelPosAck (0x0008) Description: Generated upon a positive acknowledgement is received from DCME equipment due to a 64 kbit/s release request thus indicating normal service availability. This event is used by the DCME bearer service selection. 5.2.8.1 EventDescriptor par
49、ameters None. 5.2.8.2 ObservedEventsDescriptor parameters None. 5.2.9 Positive acknowledgement Event Name: Positive acknowledgement EventID: PosAck (0x0009) ITU-T Rec. H.248.42 (05/2006) 7 Description: Generated upon a positive acknowledgement is received from DCME equipment due to a previously sent request for 3.1 kHz service or speech. This event is used by the DCME bearer service selection. 5.2.9.1 EventDescriptor parameters None. 5.2.9.2 ObservedEventsDescriptor
