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ISDNISDNIntegrated ServiceIntegrated ServiceDigital networkDigital network

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n Introductionn Introduction SDN is a set of standardsSDN is a set of standardshich define an end to endhich define an end to endigital Networkigital Network AN TechnologyAN Technology

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. . .hat is it ???. . .hat is it ??? igital communicationigital communicationtechnologyechnology -onnect directly both-onnect directly both&nternet other&nternet other/ites Usersites Users /mall Business Individuals/mall Business Individuals tandard Interfacetandard Interface , , ,oice Graphs Video Graphics, ,oice Graphs Video Graphicsnd Datand Data

ingle telephone lineingle telephone line

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Purely Digital Transmission

Ability to deliver two simultaneous connection in any

May attach Multiple Connections in the line as requir

IntegratntegratddServiceservices

Digitaligital

e

ction-Leased line

om Local Telephone Exchange to Remote UserincludiNetworketwork

IntegratntegratddServiceservices

Digitaligital

Networketwork

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ses Digital Signalses Digital Signal ses Existing telephoneses Existing telephonewiringiring harges are generally basedharges are generally based

n the duration of calln the duration of call( ow long the WAN link wasow long the WAN link was)sed)sed

lternate to using leasedlternate to using leasedlinesines aster Call setup thanaster Call setup than

Modemsodems

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an transport many types ofan transport many types of( ,etwork traffic Voice( ,etwork traffic Voice, , ,ata Video Text Graphics, ,ata Video Text Graphics)tc)tc aster Data transfer rateaster Data transfer ratehan modemshan modems

Featureseatures

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Componentsomponents SDN CHANNELSSDN CHANNELS CCESS TYPESCCESS TYPES EVICESEVICES NTERFACESNTERFACES ROTOCOLSROTOCOLS

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ChannelsChannels ChannelsChannels ChannelsChannels

SDN ChannelsSDN Channels asic Unitsasic Units

ChannelsChannels ChannelsChannels ChannelsChannels

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earer Channelsearer Channels

-64 Kbps unit of clear digital

bandwidth

Carry any type of digital( , ,information voice data or

)video with no restrictions onformat or protocol imposed bythe ISDN carrier

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/elta Demand Channelselta Demand Channels

Signalling between the customer's

terminal device and thecarrier's end switching office

Carries the information needed to

connect or disconnect calls andto negotiate special callingparameters

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/elta Demand Channelselta Demand Channels

. ., ,i e automatic number ID,call waiting data protocol

-carry packet switched data

.using the X 25 protocol

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-ata Rate D Channels-ata Rate D ChannelsType of access

Basic Rate Access D channeloperates at 16 Kbps

Primary Rate Access Dchannel operates at 64

Kbps

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igh Capacity Channelsigh Capacity Channels

, -Special high speed clearchannel

-Designed primarily for full

,motion color video are notyet in common use

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ypes H Channelsypes H Channels

.1.1 (" - ") H0 H zero 384 Kbps(" - ") H0 H zero 384 Kbps44ththof a North Americanof a North American

Primary Rate Access or one fifthPrimary Rate Access or one fifth

of a European Primary Rate Accessof a European Primary Rate Access

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ypes H Channelsypes H Channels

.2 (" - - ") - . -H11 H one one 1 536 Mbps NorthAmerican Primary Rate Access

.3 (" - - ") -H12 H one two European

Primary Rate Access

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SDN DevicesSDN Devices ( )Terminal Equipment TE ( )Terminal Adapter TA ( )Network Termination 1 NT1

( )Network Termination 2 NT2 ( )Exchange Termination ET

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SDN InterfacesSDN Interfaces

Four distinct interfaces in the

Four distinct interfaces in the

customer's connection to thecustomer's connection to thenetworknetwork

, , ,R S T and U, , ,R S T and U

" " ,Not real physical interfaces but" " ,Not real physical interfaces butsimply STANDARD REFERENCE POINTSsimply STANDARD REFERENCE POINTS

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SDN ProtocolsSDN Protocols

Protocols that govern the exchange of.data on the D channel

The two ISDN signalling protocols make

,up a layered protocol stack withthe Link Access

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Operates between TE and NT

( . )APD Q 921( . )APD Q 921SDN ProtocolsSDN Protocols

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ss/nd Response Bit

ol

(mation -only in frames carrying higher layerCheck Sequence

APD frameAPD frameSDN ProtocolsSDN Protocols

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-he ISDN D Channel Signalling Protoco

.931SDN ProtocolsSDN Protocols

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HANK YOUHANK YOU