linkstate routing protocols for unified communications

... Models for the Physical Layer and for User Traffic Generation 221 5.1 How to Account for the Physical Layer? 221 5.1.1 What to Account For and How? 221 5.1.2 Using Approximations for Error Performance ... Access Protocols 70 3.5.5 Random Access with CDMA 72 3.5.6 Protocols based on some Form of Channel Sensing 72 3.5.7 Channel Sensing with CDMA 74 3.5.8 A Case for Reservation ALOHA-based Protocols ... Multiple Access Protocols for Mobile Communications GPRS, UMTS and Beyond Alex Brand Swisscom Mobile, Switzerland Hamid Aghvami King’s College London, UK SYMBOLS A[t] Slots available for contention...

Ngày tải lên: 02/03/2013, 16:59

Ngày tải lên: 27/06/2014, 15:20

Ngày tải lên: 01/04/2014, 12:20

Ngày tải lên: 01/07/2014, 11:20

... reviewing existing protocols for resource discovery (and finding them lacking for wide area applications), we present a scalable protocol for wide area service discovery, which is ideal for discovery ... Algorithms 43 2.5.3.1 Virtual Delay Algorithms . . . 44 2.5.3.1.1 Formulation for Redundant Codecs 44 2.5.3.1.2 Formulation for Reed Solomon FEC . . . 45 2.5.3.1.3 Implementation . . . 45 2.5.3.1.4 ... establishment phase of auto-conference . . . 296 6.20 Call flow for web form entry for call center . . . 297 6.21 Bidirectional translation services for the hearing impaired . . 299 xiv c 2001 Jonathan...

Ngày tải lên: 06/11/2012, 10:35

... in the following form throughout this work: ˜ H(transformed dependencies; untransformed dependencies) where the transformed dependencies are either τ,  k,orω and the untransformed dependen- cies ... spatial relationships as well. Space-Frequency Transform Map For a static channel, we may extend the time-frequency transform map in Figure 2.9 for the space-frequency relationships shown in Figure ... STOCHASTIC CHANNEL MODELING 27 Table 2.2: Fourier transform definitions for each channel dependency. Domain Pairs Transform Inverse Transform frequency, f ⇐⇒ delay, τ +∞  −∞ {}exp(j2πτf)df +∞  −∞ {}exp(−j2πτf)dτ position,...

Ngày tải lên: 20/11/2012, 11:36

Ngày tải lên: 05/09/2013, 11:07

Ngày tải lên: 06/09/2013, 07:50

... trong routing table của Router1 sẽ không có route nào đến mạng B (10.11.0.0/16). Để giải quyết vấn đề này, dùng static routing hoặc dùng các routing hỗ trợ VLSM. Khi này thì cần phải có các routing ... cùng một subnet mask duy nhất. Vì khi các routing protocol nhận các routing update về các net khác (các network không kết nối trực tiếp), thì các classfull routing protocol sẽ lấy giá trị subnet ... IP mà gói tin ARP request yêu cầu ROUTER sẽ so sánh với Routing Table của nó và nhận gói tin này nếu Match trong Routing table, sau đó sẽ forward qua Segment thích hợp. Quá trình tiếp theo tương...

Ngày tải lên: 07/09/2013, 15:00

... New York, 1999. 126 VoIP FOR GLOBAL COMMUNICATIONS 8 VoIP FOR GLOBAL COMMUNICATIONS1 This Chapter discusses how IP-based voice communications can be deployed for global communications in multinational ... a destination, and so on. Therefore, addi- tional resources need to be allocated for these hardware and software plat- forms. The network performance–related information collected using these ... architecture for a packet-based global network for advanced or enhanced VoIP and POTS services in a multinational corporation.) (Source: Adapted from Fig. 3-8) 120 VoIP FOR GLOBAL COMMUNICATIONS ...

Ngày tải lên: 30/09/2013, 07:20

... characteristics and classification of various IP routing protocols. Although all routing protocols have a common goal of gathering routing information to support packet-forwarding decisions, they can be classified ... unicast routing protocol is optimized for processing unicast network information and provides routing intelligence for forwarding IP packets to unicast destination addresses. Multicast forwarding ... with the best cost for each route. Hence, routing protocols that are based on the Bellman-Ford algorithm commonly are referred to as distance vector protocols (see Table 1-4). Routing Convergence When...

Ngày tải lên: 16/10/2013, 12:15

... productivity applications that will streamline communications. For more information about Cisco Unified Communications, visit http://www.cisco.com/go/unifiedcommunications. Printed in ... Integrations Cisco Unified Communications with Microsoft Live Communications Server 2005 and Office Communicator 2005 The integration between Cisco Unified Communications and Microsoft Live Communications ... Support for mixed deployments of voice, integrated, and unified messaging and for different versions of Microsoft Exchange Server provides a cost-effective migration path to unified messaging.* Unified...

Ngày tải lên: 16/10/2013, 13:15

... core functions as a master processor for global control and for processing of tasks such as variable length encoding and quantization. To improve the performance for typical video coding schemes, ... Normalized silicon area and throughput for dedicated DCT circuits. c  1999 by CRC Press LLC VLSIArchitecturesforImage Communications P.Pirsch Laboratoriumfur Informationstechnologie, UniversityofHannover W.Gehrke PhilipsSemiconductors 59.1Introduction 59.2RecentCodingSchemes 59.3ArchitecturalAlternatives 59.4EfciencyEstimationofAlternativeVLSIImplementations 59.5DedicatedArchitectures 59.6ProgrammableArchitectures IntensivePipelinedArchitectures ã ParallelDataPaths ã Co- processorConcept 59.7Conclusion Acknowledgment References 59.1 ... Introduction Videoprocessinghasbeenarapidlyevolvingeldfortelecommunications,computer,andmedia industries.Inparticular,forrealtimevideocompressionapplicationsagrowingeconomicalsigni- canceisexpectedforthenextyears.BesidesdigitalTVbroadcastingandvideophone,servicessuch asmultimediaeducation,teleshopping,orvideomailwillbecomeaudiovisualmassapplications. Tofacilitateworldwideinterchangeofdigitallyencodedaudiovisualdata,thereisademandfor internationalstandards,deningcodingmethods,andtransmissionformats.Internationalstan- dardizationcommitteeshavebeenworkingonthespecicationofseveralcompressionschemes.The JointPhotographicExpertsGroup(JPEG)oftheInternationalStandardsOrganization(ISO)has speciedanalgorithmforcompressionofstillimages[4].TheITUproposedtheH.261standardfor videotelephonyandvideoconference[1].TheMotionPicturesExpertsGroup(MPEG)ofISOhas completeditsrststandardMPEG-1,whichwillbeusedforinteractivevideoandprovidesapicture qualitycomparabletoVCRquality[2].MPEGmadesubstantialprogressforthesecondphaseof standardsMPEG-2,whichwillprovideaudiovisualqualityofbothbroadcastTVandHDTV[3]. Besidestheavailabilityofinternationalstandards,thesuccessfulintroductionofthenamedservices dependsontheavailabilityofVLSIcomponents,supportingacostefcientimplementationofvideo compressionapplications.Inthefollowing,wegiveashortoverviewofrecentcodingschemesand discussimplementationalternatives.Furthermore,theefciencyestimationofarchitecturalalter- nativesisdiscussedandimplementationexamplesofdedicatedandprogrammablearchitecturesare presented. c 1999byCRCPressLLC ...

Ngày tải lên: 25/10/2013, 02:15

... responsible for operation and maintenance (monitoring, performance data, alarms, and so forth) within the RNS. ã SGSN - The SGSN is responsible for session management, producing charging information, ... cells (Figure 2.1). There are megacells for satellites, macrocells for wide- area coverage (rural areas), microcells for urban coverage, and picocells for indoor use. There is a mixture of public ... Chapter 7 debates this. 1.4 Economic Reasons for 'IP for 3G' As already indicated, IP for 3G is about reducing costs. There is nothing that IP for 3G will enable that cannot already be...

Ngày tải lên: 27/10/2013, 17:15

... Configuration 421 Viewing the Routing Table and Link-State Database 423 L1_only2A Routing Table and Link-State Database 423 L2_only2B Routing Table and Link-State Database 425 L1/L2_2to1 Routing Table and ... the University of California at Berkeley was for UNIX (BSD UNIX), Stanford University in nearby Palo Alto was even more important where the Internet was concerned. One Stanford engineering building, ... common “protocol” as the information flowed between the IMPs. Thus, each IMP only had to convert between two formats: the internal format of the host computer and the network format. This was much...

Ngày tải lên: 06/11/2013, 00:15

... productivity applications that will streamline communications. For more information about Cisco Unified Communications, visit http://www.cisco.com/go/unifiedcommunications. Printed in ... Integrations Cisco Unified Communications with Microsoft Live Communications Server 2005 and Office Communicator 2005 The integration between Cisco Unified Communications and Microsoft Live Communications ... Information. White Paper All contents are Copyright â 19922007 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 2 of 11 Unified Communications Unified...

Ngày tải lên: 10/12/2013, 17:15

Ngày tải lên: 11/12/2013, 15:15

Ngày tải lên: 11/12/2013, 15:15

... Center for Telecom- munications and Information Systems Laboratory, Stanford University, Stanford, CA, June 1994. [2] Second workshop on smart antennas in wireless mobile communications, Center for ... Telecom- munications and Information Systems Laboratory, Stanford University, Stanford, CA, July 20-21, 1995. [3] Third workshop on smart antennas in wireless mobile communications, Center for Telecom- munications ... [12, 30, 55] for more details. For a linear modulation (e.g., BPSK), we can write u(t) =  k g(t − kT )s(k) (68.2) where g(·) is the pulse shaping waveform and s(k)represents the information bits. In...

Ngày tải lên: 16/12/2013, 04:15

... interesting applications. Summary Cisco’s unified communications system does not represent a replacement for a telephone and voice mail sys- tem. Unified communications goal is to provide one common ... extent, geographical routing should be deployed in the system. Geographical routing could lead to large savings for International calls, but there would be a much lower benefit to perform- ing this ... this one unified system to the business core values , while delivering on the com- mitment to provide one system that meets all of the company’s communications needs. Cisco’s unified communications...

Ngày tải lên: 17/01/2014, 06:20