Modern broadband telecommunication networks are based on multiple transport technologies such as Asynchronous Transfer Mode (ATM), Synchronous Digital Hierarchy (SDH) and Wavelength Division Multiplex (WDM). For resilient networks, recovery mechanisms are existent in each technology. The coordination or interworking aspects of the single layer recovery mechanisms is a challenging problem and ma...

-This presentation will discuss the relative merits of various monitoring schemes, and show that by providing faster turn-up time, minimizing dowii-time in case of ii fault and enabling performance optimization, optical domain performance monitoring provides cost savings to network operators. For applications applied in the Internet today, bit error requirements may be considerably alleviated a...

Dataflow has proved to be an attractive computational model for programming digital signal processing (DSP) applications. A restricted version of dataflow, termed synchronous dataflow (SDF), offers strong compile-time predictability properties, but has limited expressive power. A new type of hierarchy semantics that we propose for the SDF model allows more expressivity in SDF while maintaining ...

Network synchronization is a generic concept that depicts a way of distributing common time and frequency references to all the nodes of a network, to align their respective time and frequency scales (Box B). The role of network synchronization, especially in the context of frequency accuracy, has grown in importance since the late 1970s, when digital transmission and switching were introduced....

this paper represents the performance of a squirrel-cage high temperature superconducting induction/ synchronous motor (hts-ism) based on nonlinear electrical equivalent circuit. the structure of the hts-ism is the same as that of the squirrel-cage type induction machine, and the secondary windings are fabricated by the use of the hts wires. it has already been shown that based on the experimen...

New timing issues have been raised by Synchronous Digital Hierarchy (SDH), which implies new phenomena generating jitter and wander compared to those well known in legacy networks based on the Plesiochronous Digital Hierarchy (PDH). First, this paper reviews the bit and byte synchronization processes that take place in a SDH transmission chain: the mapping of PDH tributaries into SDH frames, th...

Synchronous Digital Hierarchy (SDH) and Synchronous Optical Network (SONET) are the standards for lightwave transmission systems, which can accommodate various existing signal types via Tributary Units (TUs) or Virtual Tributaries (VTs). In the SDH standards, Tributary Unit-11 (TU-11) is used to transport the DS1 signal with payload pointer and path overheads. In this paper, asynchronous floati...

In today’s modern world, with the abundance of digital data, data science is identified as a rigorous discipline and machine learning (ML) techniques are commonly used. The Prognostics & Health Management (PHM) field can successfully be executed utilizing foundational approach where hierarchy needs established for successful implementation PHM on large-scale system. This paper rationalizes ...

Hierarchical access control policies, in which users and objects are associated with nodes in a hierarchy, can be enforced using cryptographic mechanisms. Protected data is encrypted and authorized users are given the appropriate keys. Lazy re-encryption techniques and temporal hierarchical access control policies require that multiple keys may be associated with a node in the hierarchy. In thi...