1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T V.59 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2000) SERIES V: DATA COMMUNICATION OVER THE TELEPHONE NETWORK Transmission quality and maintenance Managed objects for diagnostic information of public switched telephone network connected V-series
2、modem DCEs ITU-T Recommendation V.59 (Formerly CCITT Recommendation) ITU-T V-SERIES RECOMMENDATIONS DATA COMMUNICATION OVER THE TELEPHONE NETWORK General V.1V.9 Interfaces and voiceband modems V.10V.34 Wideband modems V.35V.39 Error control V.40V.49 Transmission quality and maintenance V.50V.59 Simu
3、ltaneous transmission of data and other signals V.60V.99 Interworking with other networks V.100V.199 Interface layer specifications for data communication V.200V.249 Control procedures V.250V.299 Modems on digital circuits V.300V.399 For further details, please refer to the list of ITU-T Recommendat
4、ions. ITU-T V.59 (11/2000) i ITU-T Recommendation V.59 Managed objects for diagnostic information of public switched telephone network connected V-series modem DCEs Summary This Recommendation specifies a series of Modem Managed Objects (MMO) that can be used for modem diagnostics across standardize
5、d interfaces. Source ITU-T Recommendation V.59 was prepared by ITU-T Study Group 16 (2001-2004) and approved under the WTSA Resolution 1 procedure on 17 November 2000. For the purposes of forward and backward compatibility, this Recommendation is assigned a version number 1. ii ITU-T V.59 (11/2000)
6、FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency 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
7、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 on these
8、 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, the expres
9、sion “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intelle
10、ctual 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 the Recommendation development process. As of the date of approval of this Recommendation, ITU had received not
11、ice 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 information and are therefore strongly urged to consult the TSB patent database. ITU 2001 All rights reserved. No par
12、t of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU. ITU-T V.59 (11/2000) iii CONTENTS Page 1 Scope. 1 2 References. 1 3 Definitions 3 4 Abbreviations 4 5 Modem Managed
13、 Objects Structure and Definitions . 4 5.1 Compliance Requirements 4 5.2 Model Overview . 5 5.2.1 Data Call States . 5 5.2.2 Scope and Volatility of Objects. 7 6 Object Classes. 7 6.1 Object Identification . 7 6.2 Data Type definitions 7 6.2.1 String Type simpleText . 8 6.2.2 String Type dataSequenc
14、e . 8 6.2.3 BIT STRING . 8 6.2.4 NULL Type . 8 6.2.5 Comment on the format of numbers 8 6.2.6 Object Lists 9 6.3 High-Level Objects. 9 6.4 Common Mid-Level Objects 10 6.5 Modem Identification Objects 16 6.6 Modem Capability 17 6.7 Modem Selected Mode Objects 19 6.8 Modem Diagnostic Objects 19 6.8.1
15、V.8 Diagnostics . 19 6.8.2 V.8 bis Diagnostics 20 6.8.3 V.90 Diagnostics . 23 6.8.4 V.91 Diagnostic Objects 25 6.8.5 V.92 Diagnostics . 27 6.8.6 V.34 Duplex Diagnostics. 34 6.8.7 V.32 bis Diagnostics 36 6.8.8 V.22 bis Diagnostics 37 6.8.9 V.23 Diagnostics . 38 6.8.10 V.21 Diagnostics . 39 6.8.11 V.3
16、4 half-duplex facsimile Diagnostics 39 6.8.12 V.17 facsimile Diagnostics 41 iv ITU-T V.59 (11/2000) Page 6.8.13 V.29 facsimile Diagnostics 41 6.8.14 V.27 ter facsimile Diagnostics 41 6.8.15 V.18 Diagnostics . 42 6.8.16 V.70 DSVD Diagnostics 43 6.8.17 V.61 ASVD Diagnostics 43 6.8.18 Non-Standard Mode
17、m Diagnostics . 43 6.9 Connection Diagnostic 44 6.10 Line Conditions. 46 6.11 Call Progress . 47 6.12 Protocol Performance . 49 6.13 DTE/DCE interface Diagnostics. 56 Annex A ASN.1 Notation. 58 ITU-T V.59 (11/2000) 1 ITU-T Recommendation V.59 Managed objects for diagnostic information of public swit
18、ched telephone network connected V-series modem DCEs 1 Scope This Recommendation specifies a series of Modem Managed Objects (MMO), which can be used to diagnose modem connections on the Public Switched Telephone Network for performance and statistics. This information is only valid from the beginni
19、ng of the last connection until the start of the next connection. These MMOs are relevant to information exchanged across standardized interfaces. This Recommendation does not define the DTE to DCE management process. The set of managed objects includes: a) Modem Identification; b) Modem Capabilitie
20、s; c) Modem Selected Mode; d) Modem Diagnostics; e) Line Conditions; f) Call Progress; g) Protocol Performance; h) DTE/DCE interface status. NOTE There is some similarity between the contents of this Recommendation and that of ITU-T V.58. ITU-T V.58 defines a management model for V-series DCEs and w
21、as designed within the scope of the Telecommunication Management (TMN) activity defining objects required for the management of Network Elements (NE). This Recommendation is intended to provide a standard way for untrained modem users to extract diagnostic information from modems which could be pass
22、ed on to a third party e.g. Internet Service Provider (ISP). Where ITU-T V.58 is used as a reference and if the same attributes are used in this Recommendation, this is indicated. Recommendation version For the purposes of forward and backward compatibility, this Recommendation is assigned a version
23、 number that may be included as one of the diagnostic items. NOTE The reader is encouraged to check on the ITU-T website for any normative or informative amendments to this Recommendation. Version: 1 Status: Approved November 2000 2 References The following ITU-T Recommendations and other references
24、 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; all users of this Recommendation are therefore encouraged to inves
25、tigate 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. 2 ITU-T V.59 (11/2000) ITU-T H.324 (1998), Terminal for low bit-rate multimedia communication. ITU-T T.30 (
26、1999), Procedures for document facsimile transmission in the general switched telephone network. ITU-T V.8 (2000), Procedures for starting sessions of data transmission over the public switched telephone network. ITU-T V.8 bis (2000), Procedures for the identification and selection of common modes o
27、f operation between data circuit-terminating equipments (DCEs) and between data terminal equipments (DTEs) over the public switched telephone network and on leased point-to-point telephone-type circuits. ITU-T V.14 (1993), Transmission of start-stop characters over synchronous bearer channels. ITU-T
28、 V.17 (1991), A 2-wire modem for facsimile applications with rates up to 14 400 bit/s. ITU-T V.18 (2000), Operational and interworking requirements for DCEs operating in the text telephone mode. ITU-T V.21 (1988), 300 bits per second duplex modem standardized for use in the general switched telephon
29、e network. ITU-T V.22 bis (1988), 2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits. ITU-T V.23 (1988), 600/1200-baud modem standardized for use in the ge
30、neral switched telephone network. ITU-T V.24 (2000), List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE). ITU-T V.25 (1996), Automatic answering equipment and general procedures for automatic calling equipment on the general
31、 switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls. ITU-T V.27 ter (1988), 4800/2400 bits per second modem standardized for use in the general switched telephone network. ITU-T V.29 (1988), 9600 bits per second
32、 modem standardized for use on point-to-point 4-wire leased telephone-type circuits. ITU-T V.32 bis (1991), A duplex modem operating at data signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. ITU-T V.3
33、4 (1998), A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. ITU-T V.42 (1996), Error correcting procedures for DCEs using asynchronous-to-synchronous conversion. ITU-T V.42 b
34、is (1990), Data compression procedures for data circuit-terminating equipment (DCE) using error correction procedures. ITU-T V.43 (1998), Data flow control. ITU-T V.44 (2000), Data compression procedures. ITU-T V.58 (1994), Management information model for V-series DCEs. ITU-T V.59 (11/2000) 3 ITU-T
35、 V.61 (1996), A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bit/s, with optional automatic switching to data-only signalling rates of up to 14 400 bit/s, for use on the General Switched Telephone Network and on leased point-to-point 2-wire telephone typ
36、e circuits. ITU-T V.70 (1996), Procedures for the simultaneous transmission of data and digitally encoded voice signals over the GSTN, or over 2-wire leased point-to-point telephone type circuits. ITU-T V.80 (1996), In-band DCE control and synchronous data modes for asynchronous DTE. ITU-T V.90 (199
37、8), A digital modem and analogue modem pair for use on the Public Switched Telephone Network (PSTN) at data signalling rates of up to 56 000 bit/s downstream and up to 33 600 bit/s upstream. ITU-T V.91 (1999), A digital modem operating at data signalling rates of up to 64 000 bit/s for use on a 4-wi
38、re circuit switched connection and on leased point-to-point 4-wire digital circuits. ITU-T V.92 (2000), Enhancements to Recommendation V.90. ITU-T V.250 (1999), Serial asynchronous automatic dialling and control. ITU-T V.253 (1998), Control of voice-related functions in a DCE by an asynchronous DTE.
39、 ITU-T X.680 (1997) | ISO/IEC 8824-1:1998, Information technology Abstract Syntax Notation One (ASN.1): Specification of basic notation. ITU-T X.691 (1997) | ISO/IEC 8825-2:1998, Information technology ASN.1 encoding rules: Specification of Packed Encoding Rules (PER). 3 Definitions This Recommendat
40、ion defines the following terms. 3.1 exchanged sequence: Coded binary sequences exchanged between DCEs during their start up phases. 3.2 analogue PCM modem: The analogue PCM modem is that as defined in ITU-T V.90. 3.3 digital PCM modem: The digital PCM modem is that as defined in ITU-T V.90. 3.4 IA5
41、 STRING: A simple type whose distinguished values are an ordered sequence of zero, one or more octets, each octet being an ordered sequence of eight bits. The valid contents of this type are the character set of International Alphabet Number 5 (IA5). 3.5 modem-on-hold: This term describes the proced
42、ure in ITU-T V.92 that allows for the temporary suspension of a modem connection in favour for a second incoming call without termination of the initial call. 3.6 robbed bit signalling: This term describes the occasional use of bits from PCM code words to convey signalling information for call contr
43、ol, using the least significant bit from every 6th codeword. 4 ITU-T V.59 (11/2000) 4 Abbreviations This Recommendation uses the following abbreviations. APCM Analogue PCM modem ASN.1 Abstract Syntax Notation One ASVD Analogue Simultaneous Voice and Data DCE Data Circuit-terminating Equipment (Modem
44、) DPCM Digital PCM modem DSVD Digital Simultaneous Voice and Data DTE Data Terminal Equipment ISP Internet Service Provider MMO Modem Managed Object NE Network Element PSTN Public Switched Telephone Network RBS Robbed Bit Signalling TMN Telecommunications Management Network 5 Modem Managed Objects S
45、tructure and Definitions Information items that are used for diagnosing PSTN modem connections are modelled as abstract data objects, and the view of these items is a managed object. Objects with similar attributes may be grouped into Object classes. An object is characterized by its object class an
46、d object instance, and may posses multiple attribute types and associated values. The terms “managed object class“ and “managed object instance“ apply specifically to objects that are being managed. An object class may be a subclass of another Class. A subclass inherits attribute types, packages and
47、 behaviour of the super class, in addition to possessing its own specific attributes and properties. For the scope of this Recommendation the following classes are used. High-Level Object Highest-level object in data structure hierarchy. Mid-Level Object A subclass of objects, which make up a High-L
48、evel Object. These objects inherit all the attributes of the High-Level Object. Low-Level Object A subclass of objects, which make up a Mid-Level Object. These objects inherit all the attributes of the Mid-Level objects. Object classes and attribute types are defined only for the purpose of communic
49、ating diagnostic messages between systems, and need not be related to the structure of data within those systems. The presentation of the managed objects within this Recommendation complies with the specification of ASN.1 (see ITU-T X.680). The ASN.1 as defined in Annex A should be used in conjunction with the object definitions to provide a complete overview of the diagnostics. 5.1 Compliance Requirements The Recommendation does not require DCE behaviour that is inconsistent with other V-series PSTN modem Rec
