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Software-defined networking (SDN) is a promising future network architecture which introduces new dimensionsin flexibility and adaptability to cope with different Quality of service (QoS) metrics, such as latency constraint, loss rate, etc. In this paper, we provide differentiated Services for flows of a topic-oriented publish/subscribe system to address some of the QoS guarantee issues, by leveraging...
This paper presents a modified droop-based control for dc voltage restoration in a Multi-Terminal dc (MTdc) system of parallel-operated buck converters. The proposed control structure is introduced to a proportional-derivative (PD) droop controller, which realises the active power — dc voltage droop control method. The additional control structure consists of an adaptive integrator, which decreases...
Detectors in high energy physics (HEP) that are subject to high hit rates require fast and sophisticated instrumentation. The proposed Timing Vertex Detector (TVD) requires femtosecond resolution timing to determine the space-time coordinates of the traversing particles. One of its key components is the RFpix waveform digitizing ASIC, which is being designed to operate with an analog bandwidth of...
Assigning network resources to Virtual Links (VLs) efficiently and on-demand is a challenging problem for any network virtualization solution. Known as the Virtual Link Mapping (VLM) problem, its objective is to compute the appropriate network paths with the required network resources that meet the quality of service expectations of arriving VLs while spreading the load over all nodes to maximise...
Owing to Ethernet's low cost, high bandwidth and architecture openness, much attention has been paid to develop converged Ethernet to support both time-critical services and conventional communication services on a unified network infrastructure. The greatest challenge here is providing low and deterministic latency for time-critical packets. Recently, the IEEE time sensitive networking task group...
The various flows in production datacenters usually can be classified into two types: bandwidth-hungry and delay-sensitive. To improve their performance, datacenter networks require effective load balancing and flow control protocols, respectively. However, as the two techniques are typically employed separately in current datacenters, they are unable to optimize the network in a coordinated way....
As base stations (BS) are responsible for the large amount of energy consumed in cellular networks, energy efficient BS sleep mode techniques have the potential to save a significant amount of energy. However, assuming that BSs are able to alternate between sleeping and active states as frequently as possible may have a negative impact on network reliability, shortening BS lifetime. In this paper...
In data center networks, many network-intensive applications leverage large fan-in and many-to-one communication to achieve high performance. However, the special traffic patterns, such as micro-burst and high concurrency, easily cause TCP Incast problem and seriously degrade the application performance. To address the TCP Incast problem, we first reveal theoretically and empirically that alleviating...
The controller design of servo drives for bandwidth improvement will presented in this paper. The delay issues caused by calculation, fdter and PWM generation, etc. are addressed. The controllers of current loop, speed loop and position loop are designed considering the delay and phase margin. Experimental results show the bandwidth for current, speed and position loops of servo drives are significantly...
Video constitutes the majority of traffic in ISP networks. The demand for more and higher quality videos is growing rapidly while network capacities are limited. Today, OTT video is mostly delivered over CDNs. For ISP-internal video such as IPTV channels, IP multicast provides an efficient delivery method. However, this does not scale for OTT videos due to their large number and their Zipf-distributed...
We tackle the problem of a network switch enforcing fair bandwidth sharing of the same link among many TCP-like senders. Most of the mechanisms to solve this problem are based on complex scheduling algorithms, whose feasibility becomes very expensive with today's line rate requirements, i.e. 10–100 Gbit/s per port. We propose a new scheme called FDPA in which we do not modify the scheduler, but instead...
A 14nm FinFET CMOS 12-b current-steering digital-to-analog (DAC) for 2G/3G/4G cellular applications is presented. A bit segmentation of 6-bit thermometer and 6-bit binary is adopted, and it utilizes the dynamic element matching (DEM) technique to suppress the spurious tones caused by the current source mismatches in 3-D FinFETs. In addition, to keep the voltage drop across each transistor within long-term...
The separated control and data planes in software-defined networking (SDN) with high programmability introduce a more flexible way to manage and control network traffic. However, SDN will experience long packet delay and high packet loss rate when the communication link between two planes is jammed by SDN-aimed DoS attacks with massive table-miss packets. In this paper, we propose FloodDefender, an...
Datacenter networks are often structured as multi-rooted trees to provide high bisection bandwidth at low cost. To utilize the available bisection bandwidth, an efficient load balancing algorithm is required. Packet Spraying is known to perform well in symmetric topologies as it provides per-packet load balancing over equal cost paths. However, packet spraying performs poorly in asymmetric topologies...
This paper describes a switched capacitor, 3rd order MASH 2-1 ΣΔ modulator, for signals with a bandwidth of 20kHz, using passive integrators implemented based on the ultra incomplete settling (UIS) concept. The UIS concept requires RC time constant values much larger than the clock period. Due to the low signal bandwidth the clock frequency is 10 MHz, which would result in large resistors and capacitors...
The use of Software Defined Network (SDN) in recently networking architecture has brought tremendous advantage in computer networking technology. Administrative issues such as routing, security and load balancing can be centralized and automated in SDN controllers. Controllers have been an integral part of the SDN architecture enabling intelligent networking. However, because all the packets are transmitted...
This paper presents the designs of second-order analog bandpass and bandstop filters using switched-capacitor techniques to achieve independent tunability of center frequency and bandwidth. The filter core is a lattice network that implements a structurally allpass section, in the sense that the transfer function remains allpass regardless of coefficient realization errors produced by fabrication...
In datacenter networks, flows can have different performance objectives. We use a tenant-objective division to denote all flows of a tenant that share the same objective. Bandwidth allocation in datacenters should support not only performance isolation among divisions but also objective-oriented scheduling among flows within the same division. This paper studies the Multi-Tenant Multi-Objective (MT-MO)...
Ideally, minimizing the flow completion time (FCT) requires millions of priorities supported by the underlying network so that each flow has its unique priority. However, in production datacenters, the available switch priority queues for flow scheduling are very limited (merely 2 or 3). This practical constraint seriously degrades the performance of previous approaches. In this paper, we introduce...
This paper introduces an analog bandwidth mismatch compensation technique for Time-Interleaved Analog-to-Digital Converters (TI-ADCs). It takes advantage of a Fully Depleted Silicon On Insulator (FD-SOI) technology to compensate for the bandwidth mismatch errors among channels. Our technique utilizes the body-effect to adjust the on-resistance of the sampling switch, by means of a 6-bit Digital-to-Analog-Converter...
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