Here is the ITU information SVogel. G.992.2 Splitterless is the item we've been talking about here...
INTERNATIONAL TELECOMMUNICATION UNION
Telecommunication
Standardization Bureau
Geneva, 15 March 1999
Ref: TSB Circular 177
COM 15/PR
Tel: +41 22 730 5235
Fax: +41 22 730 5853
- To the Administrations of Member States
of the Union
Copy:
- To ITU-T Sector Members;
- To the Chairman and Vice-Chairmen of
Study Group 15;
- To the Director of the Telecommunication
Development Bureau;
- To the Director of the Radiocommunication
Bureau
Subject: Meeting of Study Group 15 with a view to approving three draft revised and thirteen draft new Recommendations in accordance with the provisions of Resolution 1, Section 8, of the WTSC (Geneva, 1996)
Geneva, 22 June and 2 July 1999
To the Director-General,
Dear Sir,
1 At the request of the Chairman of Study Group 15, Transport networks, systems and equipments, I have the honour to inform you that this Study Group, which will meet from 21 June 1999 to 2 July 1999, intends to apply the procedure described in Resolution 1, Section 8, of the WTSC (Geneva, 1996) for the approval of three revised Recommendations and of thirteen new Recommendations.
2 The summaries and locations of the draft revised ITU-T Recommendations and draft new ITU-T Recommendations proposed for approval will be found in Annex 1.
3 Any ITU Member State or Sector Member aware of a patent held by itself or others which may fully or partly cover elements of the draft Recommendations proposed for approval is requested to disclose such information to the TSB, in accordance with TSB patent policy (see Resolution 1, Appendix 1 to Section 8, of the WTSC (Geneva, 1996)).
Available patent information can be accessed through TIES on the Internet (using either the World Wide Web or Gopher).
4 Having regard to the provisions of Resolution 1, Section 8, I should be grateful if you would inform me by 2400 hours UTC on 9 June 1999, whether your Administration assigns authority to Study Group 15 that these draft revised or new Recommendations should be considered for approval at the Study Group meeting.
Should any Member States be of the opinion that consideration for approval should not proceed, they should advise their reasons for disapproving and indicate the possible changes that would facilitate further consideration and approval of the draft revised or new Recommendations.
5 If 70% or more of the replies from Member States support consideration for approval of these draft revised or new Recommendations at the Study Group meeting, one Plenary session will be devoted on 22 June 1999 to apply the approval procedure. In cases where contributions have been received proposing changes to the text of draft revised or new Recommendations (other than those of an editorial nature presented by the Rapporteur/Editor) their approval may take place at the closing Plenary on 2 July 1999.
I accordingly invite your Administration to send a representative to the meeting. The Administrations of Member States of the Union are invited to supply the name of the Head of their delegation. If your Administration wishes to be represented at the meeting by a recognized operating agency, a scientific or industrial organization or another entity dealing with telecommunication matters, the Director should be duly informed, in accordance with Article 19, No. 239, of the Convention of the International Telecommunication Union (Geneva, 1992), as amended by the Plenipotentiary Conference (Kyoto, 1994).
6 The agenda, registration form and all relevant information concerning the Study Group 15 meeting will be available from Collective-letter 4/15.
7 Information on the meeting room will be displayed on the screens at the entrances to the ITU headquarters building.
8 After the meeting, the Director of TSB will notify, in a circular, the decision taken on these Recommendations. This information will also be published in the ITU Notification.
Yours faithfully,
H. Zhao
Director of the Telecommunication
Standardization Bureau
ANNEX 1
(to TSB Circular 177)
Summaries and locations of the ITU-T Recommendations
for approval at the meeting of Study Group 15 (Geneva, 21 June - 2 July 1999)
1. Draft revised ITU-T Recommendation G.780 - Vocabulary of terms for the Synchronous Digital Hierarchy (SDH) networks and equipment
(published in Report COM 15-R 33)
This Recommendation lists abbreviations and describes terms used in ITU-T Recommendations on synchronous digital hierarchy (SDH) networks and equipment.
In cases where specific SDH terms are used only in one Recommendation, they will be described in that Recommen-dation.
Plans are to enhance Recommendation G.780 in the future with abbreviations and terms related to SDH network architecture and management.
The following abbreviations and terms are used in some of the Recommendations dealing with SDH networks and equipment (G.707, G.783, G.784, G.803, G.826, G.832, G.841, G.842, G.957 and G.958)
2. Draft revised ITU-T Recommendation G.784 - Synchronous Digital Hierarchy (SDH) Management
(published in Report COM 15-R 33)
This Recommendation addresses management aspects of the synchronous digital hierarchy (SDH), including the control and monitoring functions relevant to SDH network elements (NE). The SDH management sub-network (SMS) architecture, SDH embedded control channel (ECC) functions, and SDH ECC protocols are specified. Detailed message sets are for further study.
The management of SDH equipment should be seen as a subset of the telecommunications management network (TMN) described in Recommendation M.30, and reference is made to Recommendation G.773 for the specification of protocol suites to be used at external (Q) management interfaces.
This Recommendation specifies for fault management, performance monitoring, and configuration management a library of basic equipment management function (EMF) building blocks and a set of rules by which they are combined in order to describe a digital transmission equipment's EMF functionality. The library defined in this Recommendation forms part of the set of libraries defined furthermore in Recommendation G.783.
Not every function defined in this Recommendation is required for every application. Different subsets of functions may be assembled in different ways to provide a variety of different capabilities. Network operators and equipment suppliers may choose which functions must be implemented for each application.
3. Draft revised ITU-T Recommendation G.957 - Optical interfaces for equipment and systems relating to synchronous digital hierarchy
(published in COM 15-139)
This Recommendation specifies optical interface parameters for equipment and systems based on the Synchronous Digital Hierarchy to enable transverse compatibility.
4. Draft new ITU-T Recommendation G.169 - Automatic Level Control Devices
(published in Report COM 15-R 29)
This Recommendation applies to testing of Automatic Level Control (ALC) devices intended for use in digital network-based equipment. It does not apply to subscriber-based level control devices, devices that operate in the analogue domain, or any means of fixed level control within the network which may be part of an overall network transmission plan.
The scope of this Recommendation is to define certain performance constraints for network ALC devices and, where appropriate, to define laboratory tests that may be performed on an ALC device to verify that these constraints are met.
An ALC device that satisfies all the constraints and passes all of the tests in this Recommendation, should ensure (but will not guarantee) that the pre-existing standard of overall network performance (e.g. the transmission of speech, voiceband data and other voiceband signals, ISDN etc) is not degraded when the ALC device is installed in the network.
This Recommendation also describes the general characteristics of ALC devices and indicates what characteristics are important to provide acceptable performance in the network. Issues relating to the interaction of ALC devices with other network and subscriber equipment are also discussed in this Recommendation.
This Recommendation does not define a standard algorithm.
This Recommendation does not define planning rules, deployment aspects, or target levels for ALC devices.
5. Draft new ITU-T Recommendation G.664 - General automatic power shut-down procedures for optical transport systems
(published in Report COM 15-R 37)
This Recommendation provides guidelines and techniques to provide optically safe working conditions (of Hazard Level 3A or lower) on optical interfaces of the Optical Transport Network, including conventional SDH systems, for equipment in restricted and controlled locations. For SDH applications a transverse compatible Automatic Laser Shutdown and Restart procedure is specified.
6. Draft new ITU-T Recommendation G.691 - Optical interfaces for single channel SDH systems with optical amplifiers, and STM-64 systems
(published in COM 15-138)
This Recommendation provides values for optical interface parameters for very-long and ultra-long haul STM-4 and STM-16 systems, and for all types of STM-64 systems, including short-haul systems without optical amplifiers.
7. Draft new ITU-T Recommendation G.708 - Bitrates and multiplexing structures for sub-STM-1 interfaces
(published in Report COM 15-R 33)
This Recommendation is an extension of ITU-T Recommendation G.707. It provides the requirements for the sub STM-0 signals at the Network Node Interface of a synchronous digital network in terms of:
- bit rates,
- frames structures,
- formats for mapping and multiplexing elements,
- functionalities of the overheads.
8. Draft new ITU-T Recommendation G.781 - Synchronization layer functions
(published in COM 15-129)
This Recommendation defines the atomic functions that are part of the 2 synchronization layers, the Synchronization Distribution (SD) layer and the Network Synchronization (NS) layer. It also defines some atomic functions, part of the Transport layer, which are related with synchronization.
These functions describe the synchronization of SDH NEs and how SDH NEs are involved in Network Synchronization.
The specifications in this Recommendation are the superset of functionality of three regional standards bodies. Care should be taken when selecting from this Recommendation.
Not every atomic function defined in this Recommendation is required for every application. Different subsets of atomic functions may be assembled in different ways according to the combination rules given in Recommendation G.783 to provide a variety of different capabilities. Network operators and equipment suppliers may choose which functions must be implemented for each application.
9. Draft new ITU-T Recommendation G.992.1 - Asymmetrical Digital Subscriber Line (ADSL) Transceivers
(published in COM 15-131)
This Recommendation specifies the physical layer characteristics of the Asymmetrical Digital Subscriber Line (ADSL) interface to metallic loops.
This Recommendation has been written to help ensure the proper interfacing and interworking of ADSL transmission units at the customer end (ATU-R) and at the network operator end (ATU-C) and also to define the transport capability of the units. Proper operation shall be ensured when these two units are manufactured and provided independently. A single twisted pair of telephone wires is used to connect the ATU-C to the ATU-R. The ADSL transmission units must deal with a variety of wire pair characteristics and typical impairments (e.g., crosstalk and noise).
An ADSL transmission unit can simultaneously convey all of the following: downstream simplex bearers, duplex bearers, a baseband analog duplex channel, and ADSL line overhead for framing, error control, operations, and maintenance. Systems support a minimum of 6.144 Mbit/s downstream and 640 kbit/s upstream.
This Recommendation includes mandatory requirements, recommendations and options; these are designated by the words “shall”, “should” and “may” respectively. The word “will” is used only to designate events that take place under some defined set of circumstances.
Two categories of performance are specified. Category I performance is required for compliance with this Recommendation; performance enhancement options are not required for category I equipment. Category II is a higher level of performance (i.e., longer lines and greater impairments). Category II performance and characteristics are not required for compliance with this recommendation.
This Recommendation defines several optional capabilities and features,
- echo cancellation
- trellis coded modulation
- dual latency
- transport of a network timing reference
- transport of STM and/or ATM
- reduced overhead framing modes
It is the intention of this recommendation to provide, by negotiation during initialization, for U-interface compatibility and interoperability between transceivers complying to this Recommendation and between transceivers that include different combinations of options.
10. Draft new ITU-T Recommendation G.992.2 - Splitterless Asymmetrical Digital Subscriber Line (ADSL) Transceivers
(published in COM 15-136)
Recommendation G.992.2 describes the interface between the telecommunications network and the customer installation in terms of their interaction and electrical characteristics. G.992.2 allows the transmission of POTS and V.series data services simultaneously with a digital channel over a single mixed gauge twisted metallic pair. The procedures to operate in a TCM-ISDN noise environment. Operation in the frequency band over BRA-ISDN is for further study.
The Recommendation includes procedures to allow provisioning without the need for “splitters”, typically installed at the ingress to the customer premises. Additionally, power management procedures and link states are specified to achieve power savings at the central office and customer premises.
11. Draft new ITU-T Recommendation G.994.1 - Handshake procedures for Digital Subscriber Line (DSL) Transceivers
(published in COM 15-134)
Recommendation G.994.1 provides a flexible mechanism for Digital Subscriber Line (DSL) transceivers to exchange capabilities and to select a common mode of operation. It includes parameters relating to service and application requirements as well as parameters pertinent to various DSL transceivers. G.994.1 is currently an integral part of the startup procedure for both G.992.1 and G.992.2. It is anticipated that future DSL Recommendations will also be able to make use of G.994.1. Provisions are also included for exchanging non-standard information.
12. Draft new ITU-T Recommendation G.995.1 - Overview of Digital Subscriber Line (DSL) Recommendations
(published in COM 15-132)
Recommendation G.995.1 provides the necessary guidance and an overview of the DSL family of Recommendations and is therefore informative. Specifically, Recommendation G.995.1 contains an overview of the DSL family of Recommendations, and a description of how the various Recommendations in this family are related. It also contains a definition of a generic system reference configuration and how it relates to the system reference models of the DSL Recommendations. Additionally, the definition of a generic protocol reference architecture for DSL Recommendations and derivations of the appropriate user or management plane protocol reference architectures for the DSL Recommendations is included. Also illustrations of the data service presentation options using the DSL Recommendations is provided. Finally, a glossary of the terms used in the DSL Recommendations is also included.
13. Draft new ITU-T Recommendation G.996.1 - Test procedures for Digital Subscriber Line (DSL) Transceivers
(published in COM 15-133)
Recommendation G.996.1 describes the testing procedures for ITU Digital Subscriber Line (DSL) Recommendations. The testing procedures described in G.996.1 include methods for testing DSL transceivers in the presence of crosstalk from other services, impulse noise and POTS signalling. Test loops and in-home wiring models are specified for different regions of the world for use during DSL performance testing. Other DSL Recommendations reference this document for testing procedures and configurations. G.996.1 does not specify performance requirements for these other Recommendations. G.996.1 only specifies the procedures for measuring the performance requirements for a particular Recommendation.
14. Draft new ITU-T Recommendation G.997.1 - Physical layer management for Digital Subscriber Line (DSL) Transceivers
(published in COM 15-135)
Recommendation G.997.1 specifies the physical layer management for ADSL transmission systems. It specifies means of communication on a transparent transmission channel defined in the physical layer Recommendations G.992.1 and G.992.2. It specifies Network Elements content and syntax for Configuration, Fault and Performance Management
15. Draft new ITU-T Recommendation I.741 - Interworking and interconnection between ATM and switched telephone networks for the transmission of Speech, Voiceband data and Audio signals
(published in Report COM 15-R 29)
This Recommendation provides requirements for the interworking and interconnection functions between public ATM and other types of public switched telephone networks (including wireless networks) for the transmission of speech, voice band data and audio signals. The functions include: interfaces of TDM to ATM networks, TDM to ATM conversion, transport, multiplexing, switching and echo cancellation.
16. Draft new ITU-T Recommendation V.300 - A 144 kbit/s Data Circuit Terminating Equipment standardized for use on digital point-to-point leased circuits
(published in COM 15-137)
Recommendation V.300 specifies the necessary functions of a 64, 128 and 144 kbit/s DCE for the provision of digital leased circuits. Interworking with DCEs complying with Recommendation V.38 is covered. The recommended functions also allows this DCE to be deployed as a remote access to a flexible multiplexer as specified in Recommendation G.797.
The V.24 and X.24 DTE-DCE interfaces are specified in terms of functions and electrical characteristics. The use of additional interfaces is not precluded. Core functions include scrambling of data, testing facilities, optional aggregation function and optional multiplexing function. This type of DCE may be part of a managed network.
The Recommendation contains three appendices providing information on complementary functions or applications for this type of equipment
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