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layer 2.5 softmac

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SoftMAC: Layer 2.5 MAC for VoIP Support in Multi-Hop Wireless Networks: 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. The proposed SoftMAC resides between the 802.11 MAC layer and IP layer to coordinate the real-time and best-effort packet transmission...; Tags: VoIP Service, MAC, Layer 2.5 SoftMAC, Telephony, VOIP, Telecommunications, Wireless LANs, Wi-Fi, Wireless, Networking; White papers 2005-12-07

Additional Resources

SoftMAC - Flexible Wireless Research Platform: Software-Defined Radio SDR systems have prompted some rethinking of the network stack, and schemes have been presented that attempt to take advantage of the opportunities afforded by these flexible radio systems. However, evaluation of these schemes has largely taken place only in simulation or on small testbeds. In order to...; Tags: University Of Colorado, Wireless Networking, Wi-Fi, Wireless; White papers 2005-11-04
Layer 3 Switching: This document 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. The document analyzes Layer 3 switching from both functional as well as an operational perspective, helping...; Tags: Layer 3; White papers 1998-05-01
Multi-Layer Switching Demystified: Multi-layer switching can be a confusing concept for students taking Cisco courses, and is only complicated further by more new terms arising, such as layer-3 and layer-4 switching. KnowledgeNet Instructor Jeremy Cioara employs concrete analogies to fully explain the concept of Cisco multi-layer switching in this article. "What is...; Tags: KnowledgeNet, Cisco Systems Inc., KnowledgeNet Instructor Jeremy Cioara; White papers 2001-08-01
Layer 3 Switching: An Introduction: 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. The paper analyzes Layer 3 switching from both a functional and an operational perspective, helping the reader make...; Tags: Layer 3; White papers 1998-05-01

OSI Layer-2 Encryption: Security goes one layer deeper: Ethernet Layer 2 EncryptionI find it hard to believe this article firstly has no posts, and secondly doesn't recognise Senetas. Senetas is a pure Layer 2 vendor, who provides Layer 2 encryption hardware to SafeNet, nCipher and Thales.Senetas has Layer 2 encryptors for ATM, Sonet/SDH and Ethernet, ans all...; Tags: Network technology, NETWORKING, OSI, security, andrew.younger@..., Senetas, Ethernet, Layer 2; Discussion threads 2007-09-13
MPLS VPNs: Layer 2 or Layer 3? Understanding the Choice: Since there's been data networking, there's been a debate between switched and routed architectures - stated in OSI terms, between performing functions at Layer 3 or Layer 2. Today, we see it again surfacing as network architects consider the design of Virtual Private Networks VPNs that take advantage of Multi-Protocol...; Tags: MPLS VPN, Layer 2, Layer 3, MPLS, VPNs, Networking, Network Security, Telecommunications; White papers 2002-07-05
Implementing Network Management on ATM Interfaces: This paper provides a single reference on how to gather network management data on an ATM interface through the use of Simple Network Management Protocol SNMP. It focuses specifically on Cisco router ATM interfaces. ATM comprises a three-layer stack: an ATM Adaptation Layer AAL, an ATM layer, and a physical...; Tags: Network, Network Management, ATM, Network Technology, Networking; White papers 2005-10-19
Providing Multi-Layer Security Support for Wireless Communications Across Multiple Trusted Domains: Recently many link layer security protocols have been developed and deployed to protect the wireless communications in local area networks. However, cryptanalysis has revealed lots of insecurities and vulnerabilities of the link layer protocols. This paper studies a multi-layer alternative. Compared to a link layer approach, the multi-layer architecture provides...; Tags: Wireless Communication, Domain, Wi-Fi, Wireless, Security; White papers
TCP Over CDMA2000 Networks: A Cross-Layer Measurement Study: Modern cellular channels in 3G networks incorporate sophisticated power control and dynamic rate adaptation which can have a significant impact on adaptive transport layer protocols, such as TCP. Though there exists studies that have evaluated the performance of TCP over such networks, they are based solely on observations at the...; Tags: Network, TCP, Springer Science+Business Media, Tcp/Ip, Networking; White papers 2007-02-09
My Network and Layer 3 Switching and VLANS: Please help me understand a couple of things about my network, layer 3 switching, and VLANS.. I'm confused as hell about this stuff for some reason, I usually grasp such concepts so it's frustrating. We had a network which was entirely Layer 2 in nature, but then one switch...; Tags: LANs, NETWORKING, nate@..., network, Layer 3, VLAN, server; Discussion threads 2007-04-14
Oracle Developer Day: The Services Layer With EJB 3.0: This webcast explains about various technology options for constructing the backend Services layer and the new EJB 3.0 specification as an option for simplified persistence and business logic layer.; Tags: Oracle Corp., Oracle Developer, EJB, J2Ee, Application Servers, Middleware, Enterprise Software, Software Development, Software/Web Development, Software; Webcasts
Network layer 3: What is the need of a Network layer 3 in a broadcast network?um...functionality?without the IP part of layer 3, how can you send anything to an address, let alone all addresses?I assumethis is for a report. I can give you a starting point. When a packet is recieved by a...; Tags: Routers & switches, Network technology, NETWORKING, daddybiggy@...; Discussion threads 2007-07-09
OSI Layers: I am having trouble finding out in which OSI Layer does the ultimate sender and receiver of data make contact?Hi,It's been a while since I looked at the OSI, but from memory it is the session layer.Layer 5: The session layer...This layer sets up, coordinates, and terminates conversations, exchanges, and...; Tags: networking, OSI, OSI Layer, srkcmk@...; Q&A 2005-08-28
Layer 2 Extension Between Remote Data Centers - Cisco Catalyst 6500 Series Virtual Switching System and L2VPNoGRE: 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. If there is no Layer 3 alternative, Cisco recommends the three approaches below. These approaches allow the...; Tags: Cisco Catalyst, Layer 2, Data Center, Cisco Systems Inc., Data Centers, Storage, Hardware, Data Management; White papers 2008-08-01
RCL: A New Method for Cross-Layer Network Modelling and Simulation: The evolution from wired network systems to wireless environments such as Ad-hoc networks enables the emerging of cross-layer systems to improve the wireless network performance. Efficient methods that may either produce or update cross-layer conceptual models have to be considered. Those models allow an efficient organization of the wireless systems....; Tags: Method, Wi-Fi, Wireless; White papers 2005-06-13
Application-Layer Filtering in ISA Server 2004: ISA Server 2004 is a sophisticated, application-layer aware firewall that uses a number of application filters to perform layer 7 inspection of communications moving through the firewall. ISA Server 2000 moves beyond the limitations of traditional packet-filtering firewalls to perform deep application-layer content inspection. This intelligent, application-layer filtering helps secure...; Tags: Microsoft ISA Server, ISA Server 2004, Firewalls, Network Security, Security, Networking; White papers 2004-06-01
Multiple Layer Error Control Over Wireless Links: This paper compares the wireless performance of TCP with or without selective acknowledgments and in the presence or absence of a reliable link layer protocol, in order to determine whether link layer error control remains beneficial for TCP variants with improved error recovery capabilities, such as TCP SACK. The paper...; Tags: Performance, TCP, Error, Wireless, Tcp/Ip, Performance Management, Networking, Human Resources, Workforce Management; White papers 2007-03-01
Defend the network layer from malicious attack: The network layer is key to the operation of the stack. In this sample chapter from Hack the Stack: Using Snort and Ethereal to Master the 8 Layers of an Insecure Network, begin by reviewing the protocols that reside here, such as Internet Protocol IP, Internet Control...; Tags: Snort, Network, Malicious Attack, Syngress, Chapter Coverage, Networking; Book chapters 2007-06-22
Traffic-Based Reconfiguration for Logical Topologies in Large-Scale WDM Optical Networks: Wavelength-Division Multiplexing WDM technology has emerged as a promising technology for backbone networks. The optical layer based on WDM technology provides optical routing services to the upper layers such as the packet - switching layer and the Time-Division Multiplexing TDM layer over the Generalized MultiProtocol Label-Switching GMPLS paradigm. The set...; Tags: Topology, WDM, Optical Networking, Networking; White papers 2005-10-01

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