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Wan Connectivity for Atm's

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    Wale AdetugboWale Adetugbo

    Telnet (Nigeria) LimitedTelnet (Nigeria) Limited

    February, 2006February, 2006

    TELNET

    WAN Connectivity Options For ATMWAN Connectivity Options For ATMss

    An Analysis Of Radio, Cellular & VSATAn Analysis Of Radio, Cellular & VSAT

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    ATM Connectivity

    TELNETAgendaAgenda

    Business ProblemBusiness Problem

    Connection OptionsConnection Options

    ConclusionConclusion

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    ATM Connectivity

    TELNETBusiness ProblemBusiness Problem

    Low Cost Connectivity Between ATM &Low Cost Connectivity Between ATM &

    ProcessorProcessor

    Relatively Low Bandwidth Requirement

    9.6Kbps

    Deterministic Or Guaranteed Performance

    Ability To Predict Time Taken By A TransactionDependent On Link Characteristics

    Security

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    ATM Connectivity

    TELNETConnection OptionsConnection Options

    RadioRadio

    GSMGSM

    VSATVSAT

    Infrastructural Challenges Dictate OptionsInfrastructural Challenges Dictate OptionsVariety Of Data Services Available In Developed

    Economies

    Telephone Access (Wireline) Is UbiquitousMost ATMs Use Dial Up

    Not An Option For Nigeria YET!

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- RadioRadio

    Radio Installation Connecting ATM To FinancialRadio Installation Connecting ATM To FinancialNetworkNetwork

    Point To Point LinksPoint To Point Links Licensed & UnlicensedLicensed & UnlicensedOnly Licensed Radios Can Guarantee Performance

    Unlicensed Radios Suffer From Interference

    NN Link ProblemLink Problem A City With 40 ATMs will require 40 Radio Links To A Central

    Site

    Problematic For Off Site ATMs

    Low Speed RadioLow Speed Radios Relatively Unavailables Relatively Unavailable 64K & Lower Bandwidths Required, Fractional E1 and Above

    Available

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- RadioRadio

    PricePrice

    From 10K USD Per Link

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- GSMGSM

    Use GSM InfrastructureUse GSM InfrastructureGPRS To ConnectGPRS To Connect

    ATMATMss

    Operator Provisioned ServiceOperator Provisioned Service

    No Performance Guarantees!

    Best Effort

    Inherently Low SpeedInherently Low Speed

    Theoretical Good Fit For Low Traffic RequirementOf ATM

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- GSMGSM

    GPRS PerformanceGPRS Performance

    Extremely Variable

    Due To Nature Of GPRSUses Spare Radio Capacity In Cell

    Voice Traffic Takes Precedence

    No Spare Capacity In Nigerian Networks At Present Dropped Call Or Network Problem Syndrome

    GPRS CharacteristicsGPRS Characteristics

    Low & Fluctuating Bandwidth

    High & Variable Latency

    Link BlackoutsR. Chakravorty and I. Pratt. Performance Issues with GeneralPacket Radio Service. Journal of Communications and Networks(JCN) 4, 2 (2002)

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- GSMGSM

    GPRS PerformanceGPRS PerformanceTechnicalTechnical

    Requires Dedicated PDCH (Packet Data Channel)

    For Acceptable Performance

    Acceptable Performance Defined As No Of Users &Average IP traffic In GSM Cell

    Requires Dedicated TCH (Traffic Channel)Lowers Voice Capacity In Cell

    Not Acceptable To The Nigerian Operator Today

    Congestion

    Peter Stuckman Radio Network Dimensioning for GPRSNetworks to support Mobile Internet Applications.WrzburgerWorkshop "IP Netzplanung, IP Netzmanagement und Optimierung21-7-2000 University Of Wursburg

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    ATM Connectivity

    TELNETConnection Options GSMConnection Options GSM

    PricePrice

    From 1K USD For Modems

    100 USD Monthly

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    ATM Connectivity

    TELNET

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- VSATVSAT

    VSAT Terminal Installed At ATM LocationVSAT Terminal Installed At ATM Location

    Guaranteed PerformanceGuaranteed Performance

    Fixed Bandwidth Costs

    Transaction Volumes Determine BandwidthRequired Across ALL ATMs

    100 ATMs Generating 20,000 Transactions A Day Require128K Bandwidth For 2 Second Response Time

    Cost Effective For Multiple Site Installations

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    ATM Connectivity

    TELNETConnection OptionsConnection Options -- VSATVSAT

    PricePrice

    7K USD Per Installation

    1K USD Per Month Bandwidth Costs For 100 ATMs

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    ATM Connectivity

    TELNETConclusionConclusion

    GPRS Is Cheapest But Lowest PerformingGPRS Is Cheapest But Lowest Performing

    OptionOption

    Only Use If Operator Will Give PerformanceGuarantees For Throughput, Delay, & Latency

    Impossible In Nigeria Today

    Do NOT RecommendATMs will sometimes Work. Or NOT!

    Transaction Times Highly Variable And Will Depend OnTime Of Day!

    2 Min Trasaction @ 7AM versus 10 Min Trasaction @ 4PM

    Career Limiting!!!

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    ATM Connectivity

    TELNETConclusionConclusion

    Radios Should Only Be Used In High VolumeRadios Should Only Be Used In High Volume

    Locations Or Where Multiple Services AreLocations Or Where Multiple Services Are

    Being Provided Over The Same LinkBeing Provided Over The Same LinkBank Branches

    Radio Carries ATM, Branch IP Traffic, Voice etc.

    Malls With Multiple ATMsRadio Carries Traffic For All ATMs

    Dedicated Radio Links For ATMDedicated Radio Links For ATMss

    Too ExpensiveDont Scale!

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    ATM Connectivity

    TELNETConclusionConclusion

    VSAT Is Ideal For Off Site ATMVSAT Is Ideal For Off Site ATMss

    Price & Performance

    Radio For Locations With Multiple ServicesRadio For Locations With Multiple Services

    GPRS To Be AvoidedGPRS To Be Avoided

    In Special Cases Where Contract Specifies TheLack Of Performance Guarantees & Customer IsAware Of The Problems


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