ANALYZING AND TRANSFORMING TIME DIVISION MULTIPLEXING EQUIPMENT STRUCTURE

The native Time Division Multiplexing (TDM) equipment hierarchy is not consistent and includes various non-hardware elements and many other obstacles. Techniques described herein provide a methodology for transforming the original structure to a modernized hierarchy that can correctly identify hardware elements and makes analysis and automation much more straightforward

Power consumption modeling in optical multilayer networks

The evaluation of and reduction in energy consumption of backbone telecommunication networks has been a popular subject of academic research for the last decade. A critical parameter in these studies is the power consumption of the individual network devices. It appears that across different studies, a wide range of power values for similar equipment is used. This is a result of the scattered and limited availability of power values for optical multilayer network equipment. We propose reference power consumption values for Internet protocol/multiprotocol label switching, Ethernet, optical transport networking and wavelength division multiplexing equipment. In addition we present a simplified analytical power consumption model that can be used for large networks where simulation is computationally expensive or unfeasible. For illustration and evaluation purpose, we apply both calculation approaches to a case study, which includes an optical bypass scenario. Our results show that the analytical model approximates the simulation result to over 90% or higher and that optical bypass potentially can save up to 50% of power over a non-bypass scenario

Industrial production and capacity utilization: the 2002 historical and annual revision

In late 2002, the Board of Governors of the Federal Reserve System published a revision to its index of industrial production and the related measures of capacity utilization. The primary feature of the revision was the reclassification back to 1972 of production and capacity indexes for individual industries from the Standard Industrial Classification System to the North American Industry Classification System. The revision also reflects the incorporation of newly available, more comprehensive source data, and it introduced improved methods for measuring the annual real output of communications equipment manufacturing. ; Along with the updating and the restatement of the data using the North American Industry Classification System, all production and capacity indexes are now expressed as percentages of output in 1997. The new information resulted in an upward revision to the rate of increase in industrial production and capacity from 1997 to 2000. For that period, the average rate of industrial capacity utilization is 0.7 percentage point higher than previously reported. The most recent business-cycle peak is still June 2000, at 116.2 percent of 1997, with the low being the fourth quarter of 2001. The rate of industrial capacity in the third quarter of 2002, at 76.2 percent, is essentially unchanged from previously reported data. The rate is more than 5 percentage points below its 1972-2001 average and about 3 percentage points below the trough in the 1990-91 recession but 5 percentage points above the trough in the 1982 recession.Industrial production index ; Industrial capacity

An overview of new video techniques

Current video transmission and distribution systems at CERN use a variety of analogue techniques which are several decades old. It will soon be necessary to replace this obsolete equipment, and the opportunity therefore exists to rationalize the diverse systems now in place. New standards for digital transmission and distribution are now emerging. This paper gives an overview of these new standards and of the underlying technology common to many of them. The paper reviews Digital Video Broadcasting (DVB), the Motion Picture Experts Group specifications (MPEG1, MPEG2, MPEG4, and MPEG7), videoconferencing standards (H.261 etc.), and packet video systems, together with predictions of the penetration of these standards into the consumer market. The digital transport mechanisms now available (IP, SDH, ATM) are also reviewed, and the implication of widespread adoption of these systems on video transmission and distribution is analysed

Experimental Study of Various Techniques to Protect Ice-Rich Cut Slopes

INE/AUTC 15.08 and INE/AUTC 13.07 (2013) Construction Repor

A novel concept of entanglement distribution in optical n Networks

A major road-block in bringing QKD to the market is the missing scalability of a single QKD-link connecting two users to a use-case with many users in the same metropolitan area network (MAN). The typical trusted node concept used for this, beyond requiring the trust on all intermediate nodes, is not able to distribute entanglement without the help of quantum manipulations that have yet to be demonstrated. Here we extend the concept of entanglement to many pairs of users by the introduction of novel structures. The goal of this work is the design of a MAN for quantum and co-propagating classical signals to allow an arbitrarily high number of users not bounded by e.g. the number of CWDM or DWDM channels in the ITU grid. The number of coexistent multiplexed links is clearly limited by this usable fibre bandwidth, but the network must be able to select the corresponding user out of a large pool of possible communication partners (as in mobile phone networks)

Multimedia broadcast and internet satellite system design and user trial results

The EU funded project, System for Advanced Multimedia Broadcast and IT Services (SAMBITS), has created an enhanced and synchronised, multimedia terminal for merging satellite broadcast and internet telecommunication services in a way that efficiently combines the large bandwidth of the broadcast channel and the interactivity of the internet. This paper proposes a novel broadcast and internet service concept, illustrates this concept with two service scenarios and develops a system architecture to demonstrate the range of key benefits provided by these new technologies. It then describes the interactive multimedia terminal that was used for consuming this new service concept. Finally, the results of the user trials on the terminal are presented and discussed

Configurable triple wavelength semiconductor optical amplifier fiber laser using multiple broadband mirrors

A configurable, triple wavelength fiber laser based on broadband mirrors (BBMs) and an arrayed waveguide grating (AWG) is demonstrated. The laser uses a semiconductor optical amplifier (SOA) as the primary gain medium due to its inhomogeneous broadening property that allows for the generation high intensity lasing wavelengths. The combination of the AWG and BBMs allows for triple lasing wavelength outputs with channel spacing from 0.8 to 4.0 nm to be obtained. The generated output is adjustable between 1540.6 and 1548.6 nm. The proposed SOA-based system is stable and can be used as a reserve laser source for wavelength division multiplexing systems. © 2019 Wiley Periodicals, Inc