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- QoS: What Is It? Why Do We Need It?
- Quality of Service QoS is the ability to treat packets differently as they transit a network device, based on the packet contents. Without QoS, all packets on the network vie for the same pool of resources, and when congestion occurs. QoS can be used to address issues such as...
- Tags: QoS
- White papers 2008-04-11
- Assuring Voice Quality on IP Telephony Rollouts
- IP Telephony deployment changes dramatically when the job grows from "a few sites" to a full company-wide rollout across many locations. Achieving a high level of QoS for VoIP across the WAN and Internet often runs counter to the interests and needs of other network traffic on a converged infrastructure....
- Tags: Deployment, QoS, Telephony, Performance, IP Telephony, IP, VOIP, Performance Management, Telecommunications, Network Technology, Networking, Human Resources, Workforce Management
- Webcasts 2008-05-14
- An OFDM-TDMA/SA MAC Protocol With QoS Constraints for Broadband Wireless LANs
- Orthogonal Frequency Division Multiplexing OFDM is an important technique to support high speed transmission of broadband traffic in wireless networks, especially broadband wireless Local Area Networks LANs. Based on OFDM, a new multiple access scheme, called OFDM-TDMA with subcarrier allocation (OFDMTDMA/ SA), is introduced in this paper. It provides more...
- Tags: QoS, Broadband Wireless, Broadband, WLAN, OFDMA, Broadband Internet, OFDM, Network Technology, Telecommunications, LANs, Wireless, Networking
- White papers
- Ensuring Data Quality of Service in UMTS Networks
- There is ever-increasing pressure on Wireless Service Providers to grow their average revenue per user ARPU whilst decreasing their operating costs. These contradictory objectives can only be achieved through radical changes in processes and practices. The introduction of compelling wireless data services gives operators an opportunity to attract higher profit...
- Tags: Data Quality, UMTS, QoS, Agilent Technologies Inc., Wi-Fi, Wireless
- Webcasts
- Multi-Path Admission Control for Mobile Ad Hoc Networks
- As wireless networks become more prevalent, users will demand the same applications that are currently available in wired networks. Further, they will expect to receive a quality of service similar to that obtained in a wired network. Included in these applications are real-time applications such as voice over IP and...
- Tags: QoS, Mobile, Network
- White papers
- QoS and Aperiodic Tasks Scheduling for Real-Time Linux Applications
- There has been increasing interest in the real-time community for Quality of Service QoS based systems, such as multimedia and telecommunication systems. This paper deals with scheduling components integrating new QoS functionalities under Linux/RTAI (Real-Time Application Interface) [Rta04]. The work relies on a periodic task model which allows occasional deadline...
- Tags: Linux, QoS, Telecommunications, Telephony, Networking
- White papers
- Performance Modeling and QoS Evaluation of MAC/RLC Layer in GSM/GPRS Networks
- A continuous time Markov chain model is used in this paper to analyze the GSM/GPRS MAC/RLC layer function and compare the performance of three different channel allocation algorithms. Using simulation, the analytical model is verified. The results show that both the data source characteristics such as degree of burstiness and...
- Tags: Data Source, QoS, Performance, Network, GPRS, Allocation, GSM, University Of California, Cellular Phones, Consumer Electronics, Personal Technology
- White papers
- Quality of Service Aware MAC Based on IEEE 802.11 for Multihop Ad-Hoc Networks
- Real-time multimedia applications necessitate predictable network resources. Quality of Service QoS support for such applications in mobile ad hoc networks MANETs requires acceptable channel conditions, QoS-aware mechanisms for channel access, identification of proper forwarding transit nodes, as well as measures for congestion prevention and management in those nodes. This paper...
- Tags: Aware, IEEE 802.11, QoS, MAC, Network
- White papers
- Evaluation of Quality of Service Schemes for IEEE 802.11 Wireless LANs
- This paper evaluates four mechanisms for providing service differentiation in IEEE 802.11 wireless LANs, the Point Coordinator Function PCF of IEEE 802.11, the Enhanced Distributed Coordinator Function EDCF of the proposed IEEE 802.11e extension to IEEE 802.11, Distributed Fair Scheduling DFS, and Blackburst using the ns-2 simulator. The metrics used...
- Tags: IEEE 802.11, QoS, Point Coordinator Function Performance, Wireless LANs, Wi-Fi, Wireless
- White papers
- Marconi Adds Quality of Service to a Wireless Broadband Network
- Faced with a bandwidth shortage that could decelerate economic growth, community leaders in Western Maryland are working toward a common goal: expanding a successful wireless network for county government into a "local loop" infrastructure that will deliver broadband services to virtually all of the area's businesses and residences. Their innovative...
- Tags: Marconi, Broadband Network, QoS, Network, Wireless Broadband, Broadband Internet, Government, Wireless, Wi-Fi, Telecommunications
- Case studies
- Performance of an Overlay Bluetooth-WiFi Network With Vertical Handover
- The performance of an overlay Bluetooth and IEEE 802.11b WiFi network is considered in terms of QoS parameters, that is packet latency and throughput, in the presence of a vertical handover procedure. The objective of the overlay network is to maximize the QoS allowing the possibility for a mobile to...
- Tags: QoS, Performance, Network, Performance Management, Networking, Human Resources, Workforce Management
- White papers
- Managing Wireless Data Networks
- There is ever-increasing pressure on Wireless Service Providers to grow their average revenue per user ARPU whilst decreasing their operating costs. These contradictory objectives can only be achieved through radical changes in processes and practices. This webcast discusses an end-to-end holistic approach to monitoring network quality of service, from a...
- Tags: Data Network, Wireless Data Network, QoS, Network, Agilent Technologies Inc., Wi-Fi, Wireless
- Webcasts
- Marimba and Celestix Partner to Deliver Linux-Based Hardware Appliance for On-Demand Software Management
- Celestix Networks Inc., is a leading developer of Internet managed security appliances that are complete, ready-to deploy solutions. Celestix and Marimba, Inc. have formed an alliance to offer a cost-effective solution for enterprise change management. Using Marimba's management software enhances the capabilities of the Celestix appliance by efficiently distributing software...
- Tags: Software, BMC Software Inc., Linux, QoS, Marimba, On-demand, Hardware, Tools & Techniques, It Management, Roi/Tco, Management, It service Management, Finance, Managerial Accounting
- Case studies
- Quality of Service Technical White Paper
- This white paper reviews emerging QoS mechanisms and how they are integrated to optimize the utilization of network resources. It then specifically discusses Microsoft's QoS mechanisms.
- Tags: QoS, Microsoft Corp.
- White papers
- GIE Informatique Arpege Uses BMC Remedy Solutions to Unify and Centralize Support Services for Enhanced Performance and Improved Quality of Service
- GIE informatique Arpege wanted a unifying help desk and change management services. GIE informatique Arpege chose BMC Remedy IT Service Management solutions to improve its services by gradually unifying the support delivered to the 12 "Caisses d'Epargne" banks in its remit, while rationalizing and automating change and incident management. Arpege...
- Tags: BMC Software Inc., QoS, Performance, Support Services, Remedy Corp., ITIL, Change Management, It Management, It Services, Process Improvement, Tools & Techniques, Management, It service Management, Quality, Business Operations
- Case studies
- Push, Inc. Uses Trend Micro ScanMail to Maintain Quality of Service
- Push, Inc. is an Application Service Provider ASP in Santa Barbara, California. It provides Customer Relationship Management and email services to about 20 mid-market companies. Because Push is an ASP, its servers are physically inaccessible to users. The company's primary source of infection is electronic mail. "Melissa, 'I Love You,'...
- Tags: QoS, Trend Micro Inc., E-mail, Application Service Providers (ASPs), Web Hosting, Business Services, Online Communications, Internet
- Case studies
- An Enhancement to the IEEE 802.11e EDCA Providing QoS Guarantees
- One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is Quality of Service QoS. However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad hoc networks, does not address this issue. In order...
- Tags: QoS, IEEE, Lund University, Wireless LANs, Wi-Fi, Wireless
- White papers
- With Avaya Contact Center Solutions, WebHelp Is Enhancing Its Quality of Service
- WebHelp had been using an aging telephone platform, whose architecture could not handle the exponential growth of their activities. The new center is based on a centralized architecture that allows the creation of a "Virtual" Multi-Site Call Center and is supposed to contribute to the optimization of the routing and...
- Tags: QoS, Phone, Avaya Inc., Telecom & Utilities
- Case studies
- Mobile IPv6 and Some Issues for QoS
- In this paper, the advantages of IPv6 for mobility are given and the Mobile IPv6 protocol is overviewed. Then the paper introduces some issues about QoS support in mobile IPv6 such as fast handover, smooth handover and mobility managements. Since the provisions in the existed QoS architectures such as InterServ...
- Tags: QoS, Mobile
- White papers
- Tasman Networks Case Study: MASERGY
- Based in Dallas, Texas, MASERGY is a privately-held company that provides outsourced network services over its own MultiProtocol Label Switching MPLS-based network to hundreds of medium to large businesses in the U.S. and multi-national companies around the world. When MASERGY began selling its services, the network service provider offered two...
- Tags: Tasman Networks, PPP, QoS, MPLS, Network, Network Service, Frame Relay, Networking, Network Technology
- Case studies
