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Passport 8600 Routing Switch - Layer 2/3 Performance
White Papers Network managers deploying enterprise-class Layer 2/3 routing switches understand the importance of line-rate throughput. With the emergence of VoIP and other latency sensitive applications, line rate throughput and low latency are essential.
[October 21, 2003, 5:43]
Layer 2 Extension Between Remote Data Centers - Cisco Catalyst 6500 Series Virtual Switching System and L2VPNoGRE
White Papers Cisco recommends retaining Layer 2 domains within each data center. However to meet new application framework requirements or for migration purposes, the Enterprise may have to extend Layer 2 beyond the Data Center.
[October 7, 2008, 1:01]
SoftMAC: Layer 2.5 MAC for VoIP Support in Multi-Hop Wireless Networks
White Papers This paper presents the challenges in supporting VoIP services over multi-hop wireless networks using commercial IEEE 802.11 MAC DCF hardware, and proposes a novel software solution, called Layer 2.5 SoftMAC.
[June 16, 2006, 1:00]
Layer 3 Switching: An Introduction
White Papers This paper is a map through the jungle of internetworking infrastructure, particularly focusing on how Layer 2 switching and Layer 3 routing have combined to form the powerful Layer 3 switching architecture.
[August 20, 2003, 2:54]
A Simple and Effective Cross Layer Networking System for Mobile Ad Hoc Networks
White Papers This paper proposes a novel cross layer design concept that could improve the network throughput significantly for mobile ad hoc networks. The channel reservation control packets employed at the MAC layer can be utilized at the physical layer in...
[August 13, 2007, 8:09]
Architecture of and Migration to SOA's Presentation Layer
White Papers In this paper the state-of-the-art concepts and relevant standards related to the presentation layer of service-oriented architectures are described. Service-Oriented Architectures (SOA) enables enterprises too quickly respond to changing business...
[March 29, 2007, 1:00]
The Virtual Node Layer: A Programming Abstraction for Wireless Sensor Networks
White Papers The Virtual Node Layer (VNLayer) programming abstraction provides programmable, predictable automata-virtual nodes-emulated by the low-level network nodes. This simplifies the design and rigorous analysis of applications for the wireless sensor...
[August 23, 2007, 1:00]
Using a five-layer filter to cut spam
Talkback Maybe a one layer system with the filtering spread out over five tiers. You might call it a five tiered system with 1 layer of spam protection. I don't see how that is five layers of filtering. I don't see how any of your tiers are overlapping.
[December 17, 2003, 16:44]
Fairness and Physical Layer Capture in Random Access Networks
White Papers While physical layer capture has been observed in real implementations of wireless devices which randomly accessing shared channels, fair rate control algorithms based on accurate channel models describing the phenomenon have not been developed.
[August 13, 2007, 8:09]
Double-layer DVD heats up standards battle
Talkback I love the idea of a double-layer recordable DVD, but since the industry failed to handle single-layer properly I can't say I'm too excited about using a double-layer format. The compatibility problems with DVD-R is still an issue and now they're...
[March 5, 2004, 13:51]
Intelligent Layer 7 DoS and Brute Force Protection for Web Applications
White Papers However, most of today's DoS attacks target layer 7 (L7) by overwhelming applications with seemingly valid requests and Brute Force programs can send more than one million attempts per second. Both Denial of Service (DoS) and Brute Force Attacks...
[July 13, 2009, 0:00]
Cross-Layer Optimization for Scheduling in OFDM-TDMA Transmission
White Papers The activities are grouped in clusters dealing with different data rates in the physical layer. In the integrated project My personal Adaptive Global NET (MAGNET) of the European Union, advanced adaptive and scalable air interface concepts for...
[March 30, 2005, 3:00]
Cross-Layer Optimization of OFDM Transmission Systems for MPEG-4 Video Streaming
White Papers This paper studies the performance of a combined link- and physical-layer approach for the downlink of a dynamic OFDM-FDMA transmission system delivering MPEG-4 video streams. This cross-layer approach allows to utilize channel-related knowledge...
[April 11, 2007, 1:01]
Two Layer Denial of Service Prevention on SIP VoIP Infrastructures
White Papers This paper proposes two layer architecture to prevent Denial of Service attacks on VoIP systems based on the Session Initiation Protocol (SIP). The emergence of Voice over IP (VoIP) has offered numerous advantages for end users and providers alike...
[June 20, 2009, 1:21]
Cross-Layer Optimization for OFDM Wireless Networks - Part II: Algorithm Development
White Papers The authors have established a theoretical framework for cross-layer optimization in Orthogonal Frequency Division Multiplexing (OFDM) wireless networks. This paper focuses on effective and practical algorithms for efficient and fair resource...
[April 11, 2007, 1:01]
Cross-Layer Adaptation of MPEG4 Video Streaming Over Wireless Networks Using Unequal Error Protection and MC-CDMA
White Papers The proposed cross-layer adaptation jointly exploits Variable-BitRate (VBR) Multi-Carrier Code-Division Multiplexing (MC-CDM) and MPEG4 Fine-Grain-Scalability (FGS) in order to provide unequal error protection to the transmitted video stream.
[February 8, 2006, 0:01]
Design Considerations and Initial Physical Layer Performance Results for a Space Time Coded OFDM 4G Cellular Network
White Papers The key design considerations and link parameters for a 4G OFDM system are identified and initial physical layer performance results are presented for a number of transmission modes and channel scenarios.
[April 11, 2007, 1:01]
Dynamic Resource Allocation in OFDM Systems: An Overview of Cross-Layer Optimization Principles and Techniques
White Papers Recently, a lot of research effort has been spent on cross-layer system design. It has been shown that cross-layer mechanisms (i.e.policies) potentially provide significant performance gains for various systems.
[April 11, 2007, 1:01]
Multimedia Communication Over OFDM Mobile Wireless Networks: A Cross-Layer Diversity Approach
White Papers In this work, by considering transmission of an embedded bitstream over a slow varying Rayleigh faded environment, the authors develop a cross-layer diversity technique which takes advantage of both multiple description source coding and frequency...
[April 11, 2007, 1:01]
Utility-Based Joint Physical-MAC Layer Optimization in OFDM
White Papers In this paper, joint physical-MAC layer optimization in OFDM systems using adaptive modulation and subcarrier allocation is investigated based on utility theory. The paper formulates cross-layer optimization problem as one that maximizes the sum of...
[April 13, 2007, 1:01]
