Post on 06-Apr-2018
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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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TELNETAgendaAgenda
Business ProblemBusiness Problem
Connection OptionsConnection Options
ConclusionConclusion
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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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TELNETConnection OptionsConnection Options -- RadioRadio
PricePrice
From 10K USD Per Link
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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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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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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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TELNETConnection Options GSMConnection Options GSM
PricePrice
From 1K USD For Modems
100 USD Monthly
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TELNET
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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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TELNETConnection OptionsConnection Options -- VSATVSAT
PricePrice
7K USD Per Installation
1K USD Per Month Bandwidth Costs For 100 ATMs
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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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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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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