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 Monday, 18 June 2007

Another step towards all optical networks (AON) has been achieved with the consent of the new Recommendation G.680 by ITU-T's Study Group 15.

The Recommendation will allow operators to take optical add/drop multiplexers (OADMs) and photonic cross-connects (PXCs) from different vendors and integrate them in to an all optical network without having to add expensive optical/electrical/optical conversion (O/E/Os).

This achievement is made possible as the Rec gives operators a way to evaluate the end-to-end quality of a signal where photonic cross-connects (PXC) and optical add/drop multiplexers (OADMs) are deployed. In addition, experts say that the evolution towards an AON could significantly reduce costs for operators by reducing the need for costly optical/electrical/electrical (O/E/O) conversion. As optical transport networks (OTN) evolve, the number of - expensive - O/E/O conversions within their boundaries is coming down.

The two main reasons for the reduction in the number of O/E/O conversions are that DWDM systems are becoming capable of carrying light signals for thousands of kilometers without electrical regeneration and that PXCs and OADMs are becoming available with the capacity, space requirements, power consumption, reliability and cost, suitable for their use in the telecommunication networks. With this evolution experts predict that AONs could extend to all potential routes of the backbone network of a medium size country - optical paths up to around 2,000 km.

The Recommendation defines a "degradation function" of optical network elements (ONEs) such as photonic cross connects (PXCs), optical add-drop multiplexers (OADMs), etc. making up an optical network. It enables the degradation of the signal quality in an all-optical network consisting of ONEs including DWDM line segments to be assessed.

Monday, 18 June 2007 09:14:28 (W. Europe Standard Time, UTC+01:00)  #     | 

An upgrade to a widely used specification for fibre optic cables will allow the simpler deployment of Gigabit Ethernet (GbE) in FTTH applications up to 500 m link distance. The original Recommendation ITU-T Rec G.651 provided specifications for multimode fibre which is currently widely deployed for data communications, but not for telecoms.

The work was initiated given two observations; the cost disparity between telecom and data networks, where high speed GbE telecom equipment is often far more expensive than datacom equipment; and the economics of rolling out FTTH into multi-tenant (apartment) buildings where there is a high subscriber density. Ethernet is increasingly seen as an end-to-end technology.

Similar to recently published Rec G.657 on single mode fibre, Recommendation G.651.1 allows for increased cable flexibility. This increased flexibility in a fibre optic cable means that operators can follow tighter corners in buildings and can worry less if cables / fibres are laid with a sharp bend. This all makes installation work more engineer friendly leading also to less re-work. Moreover the closures for fibres can be half the size, important where space is at a premium especially in multi-tenant buildings.

G.651.1 retains many of the key characteristics of its well known predecessor. However manufacturing tolerances and transmission characteristics have been improved significantly. In addition, it has been harmonized fully with relevant IEC standards.

Monday, 18 June 2007 09:10:50 (W. Europe Standard Time, UTC+01:00)  #     | 
 Wednesday, 13 June 2007
Working Party 1, 2, 3, and 4/13 Meetings of Study Group 13 - Next Generation Networks

Geneva, 21 September 2007 (afternoon)

Registration Form

See TSB Collective-letter 8/13 for more information.

Study Group 13 Home

Wednesday, 13 June 2007 17:26:45 (W. Europe Standard Time, UTC+01:00)  #     | 
 Monday, 11 June 2007

Study Group 13 the lead for NGN in ITU met in April reached final ‘approval’ stage on two Recommendations and consented a number of others, as well as starting discussions on some new work areas. SG13 met concurrently with SGs 19 and 11 as part of the NGN Global Standards Initiative (NGN GSI).

Among inputs to a special ‘futures’ brainstorming session at the meeting were proposals on Mobile IPTV standardization and a “Future Vision beyond NGN”. Mobile IPTV is described as IPTV to mobile and wireless networks. There was discussion on a possible standard that would be neutral in terms of the wireless technology and would cover architecture for NGN, authentication for user mobility and seamless connectivity for mobility, security, and signaling for scalable delivery of content.

The paper “Future Vision beyond NGN” proposed that the future beyond NGN is next generation ubiquitous networking. Study areas for ITU-T and particularly Study Group 13 could be media, identity and so-called ABC (for accounting, billing and charging) processing; open service environment, service and transport control; extending QoS capabilities for bandwidth, security, mobility, personalization and media; supporting a variety of NGN applications including fixed-mobile convergence (FMC), networked IDs, ubiquitous sensor networks (USN), home networking, IPTV etc. The paper also proposed that this work should be more closely linked with protocol development.

Another important document given the first stage approval known as consent defines the service requirements, service features, service architecture, and implementation scenarios of IMS based real-time conversational multimedia services. These include PSTN/ISDN simulation services. When these real-time conversational multimedia services are provided by using an IMS-based service environment, the implementations will use SIP protocol between the Service Support Functions and the Service Control Functions [ITU-T Y.2012] [ITU-T Y.2021]. IMS based NGNs which meet these service requirements will be capable of supporting real-time conversational multimedia services with new service features as well as allowing for new implementation scenarios.

Also consented were documents charting OAM requirements for T-MPLS based networks and QoS control architecture for Ethernet-based IP access networks.

Study Group 19 meeting at the same time consented a document outlining the general requirements for fixed-mobile convergence – a key application in NGN.

Monday, 11 June 2007 17:38:18 (W. Europe Standard Time, UTC+01:00)  #     | 
 Thursday, 07 June 2007
Press release here.

Thursday, 07 June 2007 10:42:21 (W. Europe Standard Time, UTC+01:00)  #     | 
 Monday, 04 June 2007

ITU-T is establishing an ''Expert Group'' which will review the International Telecommunication Regulations (ITRs). 

The ITRs are an international treaty whose purpose is to promote the development of telecommunication services and their most efficient operation while harmonizing the development of facilities for worldwide telecommunications.

The ITU Telecommunication Standardization Sector (ITU-T) was requested by the Plenipotentiary Conference of 2006 to start the review process of the ITRs, which was last updated in 1988. The review is considered appropriate in light of the changing ICT environment characterized by convergence of telecoms, IT, broadcast as well as other industry sectors and also the liberalization of telecoms markets.

The Expert Group will examine the existing ITRs. The output of the ITU-T review will feed into a World Conference on International Telecommunication (WCIT) scheduled for 2012. A different process, the World Telecommunication Policy Form (WTPF), will consider emerging telecommunications policy and regulatory issues with respect to international telecommunication networks and services.

The first meeting of the Expert Group will be held in Geneva, 10-11 October 2007. Information relating to the expert group will be available on the ITU-T website here . Information on the WTPF is available on the ITU-T website here.

Monday, 04 June 2007 14:52:08 (W. Europe Standard Time, UTC+01:00)  #     |