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1ISDN

ISDN

MODULE ID: SCWMISDN01

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2ISDN

Scenario before ISDNBefore ISDN, communication networks vary with the type of service, such as PSTN N/W, Telex N/W and Data N/W independently

Teleprinter Connected toTelex

Phone Connected toPSTN

Data Terminal

Connected toPSPDN

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3ISDN

End to End digital connectivity.

Provides Voice and Non-voice services in the same Network.

Offers standard user network interface.

ISDN Concepts

Integrated Service Digital Network

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4ISDN

After ISDN, a single network handle various types of services as follows:

New TechnologyExchange

Phone

Tele printer

Data terminal

NT

Scenario after ISDN

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5ISDN

ISDN Principles

ISDN Principles

Service integration

Connection function

Basic Service Intelligence

Layered protocol structure

Progressive evolution

Broad band capability

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6ISDN

What is ISDN? As per CCITT: A Network evolved from the telephony with integrated digital network(IDN) that provides end to end digital connectivity to support a wide variety of services , to which users have access by a limited set of standard multi- purpose customer interfaces

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7ISDN

Advantages of ISDNFor the user

One access for the several services An improved transmission quality

For administration Operation and maintenance procedures are simplified Existing copper cable is used

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8ISDN

Types of ISDN

NARROW BAND ISDN (N-ISDN)

< 2Mbps

BROAD BAND ISDN (B-ISDN)

More than 2Mbps

Basic rate access (BRA) or

Basic Rate Interface 2B+D 128 Kbps

Primary rate access (PRA) or Primary Rate Interface

30B+D2Mbps

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9ISDN

ISDN Channels

B-Basic channel or Bearer channel @ 64Kbps rate D-Data channel or Delta channel @ 16Kbps rate

OR @ 64 Kbps H- Channel Higher rate interfaces

@ 384(H0), 1536 (H11), 1920(H12)

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10ISDN

ISDN Channels

CHANNELTYPE

CHANNEL BITRATE

PURPOSE

B 64 Kbps User information transfer channel Circuit swg/ packet swg

D 16 Kbps OR64 Kbps

Signalling channel for circuit swg/packet swg connection

Information channel for packetswitched data on D - channel

User to user information channel

H HO=384 KbpsH11=1536 KbpsH12=1920 Kbps

User information transfer channel Circuit swg/ packet swg

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11ISDN

ISDN interfaces

There are 3 types of interfaces are defined in ISDN 1.Basic rate access (BRA)

Useable for customer =2*64 +16=144Kbps Additional 48kbps are used for synchronization, framing

and overhead purposes Total=2*64 +16+48=192Kbps

2.Primary rate access (PRA) Useable for customer =30*64+64=1984Kbps Additional 64kbps are used for synchronization, framing

and overhead purposes Total=30*64 +64+64=2048Kbps or 2.048Mbps

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12ISDN

ISDN interfaces

3.Higher rate interfaces H0 interface

384Kbps or 6B channels H1 interface

H11 interface 1536Kbps or 24B channels or 4 H0

interface H12 interface

1920Kbps or 30B channels or 5 H0 interface

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13ISDN

UNI configuration

User network interface ( UNI) configuration is covered as follows:1. ISDN subscriber system functional configuration2. ISDN subscriber access configuration

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14ISDN

U point is digital supports full duplex mode

No loading coils & bridge taps(BT) should

be used on line

open wire should be avoided

Max distance 4.5 Km-5Km

NT1

MDFExch

Loss < 52db

at 80Khz

Max distance is calculated based on thinnest gauge of cable used in network

( 0.4 mm )

U

Line Part of ISDN

U point: ordinary cable pair

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15ISDN

ISDN subscriber system functional configuration

This is covered with the following equipments called customer premises equipments (CPE):

1.Network terminator-type 1 (NT1)2.Network terminator-type 2 (NT2)3.Terminal equipment type-1 (TE1)4.Terminal equipment type-2 (TE2)5.Terminal adapter (TA)

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16ISDN

S/T

User-network Interface Configuration

LE NT1 NT2TE1

TE1

TA

TE2

R

TR

S

TU

Subscriber system functional configuration

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17ISDN

Network terminator-type 1 (NT1) Subscriber line terminationConversion of 2wire to 4 wireU point framing to S/T point framing 2B1Q AMI Code Conversion Power Feeding to TE1TE Activation/Deactivation

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18ISDN

Network terminator-type 2 (NT2)

Layer 2 & 3 Protocol HandlingSwitchingConcentrationMaintenance Function Interface Termination

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19ISDN

Terminal equipment type-1 (TE1) TE1:

ISDN Feature Phone- For Voice Telephony PC with Add- On- Card - For File Transfer

function, Video conferencing (128Kbps) Picture Phone G4 faxHigh Speed Video Conferencing

Equipment(384Kbps) Terminal Adopter

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20ISDN

Feature Phone

Low cost feature phone LCD display,lamp for last call logging Single call log Suspend(TP), call hold(CH) & Call waiting(CW) buttons Hands free operation, redial,memory & display key Hide key for CLIR Program key

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21ISDN

TE2: - Analog Telephone - G3 Fax - PC with RS232 Interface - PC with X.25 Interface

Terminal equipment type-2 (TE2)

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22ISDN

Terminal Adapter (TA)

Terminal Adapters:- Permits a non-ISDN terminal (TE2) to access

ISDN.- Analog Ports (Fax/Telephone)- Data Ports (RS232C, X.25 etc.)

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23ISDN

NT1 2W

S B

US

- 4 W

IRE

PC with ISDN Adapter

TA

Analog Devices

G4 FAX

Video Phone

BRA UNI Configuration

LE

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24ISDN

UNI Access Configuration

Primary Access Configuration

Point To Point ConfigurationLT TE

T

30B+D

30B+D

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25ISDN

NFAS

Non-Facility Associated Signaling (NFAS) ISDN NFAS allows a single D channel to control multiple

PRI interfaces. Use of a single D channel to control multiple PRI interfaces

can free one B channel on each interface to carry other traffic.

Any hard failure causes a switchover to the backup D channel and currently connected calls remain connected.

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26ISDN

Primary Access Configuration with NFAS

LT TE

T

30B+D

31B

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27ISDN

ISDN services

ISDN SERVICES

Basic Services Supplementary services

Bearer services Tele services

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28ISDN

ISDN Services

TE TEISDN

NETWORK

BEARER SERVICE

TELE SERVICE

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29ISDN

Bearer Services

Provides Capability For Information Transfer Between TEs.

Defined in terms of attributes, includes mode ( Circuit or Packet). Structure ( Bit stream or octet stream) transfer rate ( eg 64kbps) transfer capability ( basically the content eg

speech, video)

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30ISDN

Tele ServicesTelephony Provides 3.1khz speech communication

Telex Provides end to end text communication.

Tele fax Provides end to end facsimile comm

Videotext Interactive video communication with

Teleconferencing Multiparty communication

Videoconference Multiparty video communication

Videophone Video Call

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31ISDN

Video Conferencing Desktop Video conferencing(128Kbps): Works on one 2B+D line

Contains 1 digital Camera, 1 video card / 1 ISDN

interface card to be fitted in PC

One picture call generates 2 ISDN 64kbps calls.

112kbps- picture 16kbps-audio

NTS Bus ISDN 2B+D

line

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32ISDN

ISDN lines123

Inverse multiplexerElectroni

c moduleCamera

High Quality Video Conference equipment setup

TV

Video Conferencing

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33ISDN

Supplementary ServicesSupplementary Services based on CLI

Calling Line Identification Presentation (CLIP) Calling Line Identification Restriction (CLIR) Calling Line Identification Override (CLIO)

Connected Line Identification Presentation (COLP) Connected Line Identification Restriction (COLR)

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34ISDN

Supplementary Services

Call Forwarding Call Forwarding unconditional (CFU) Call Forwarding Busy ( CFB) Call Forwarding No Replay ( CFNR) Call Transfer (CT) Call Deflection ( CD)

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35ISDN

Supplementary Services

Terminal Portability(TP) SUSPEND & RESUME a call

Call Hold (CH) To hold a call while second call is made.

Multiple Subscriber Number (MSN)

More than one Directory numbers can be allocated to the same ISDN line

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36ISDN

Supplementary Services AOC: Advice Of Charge DDI: Direct Dial In CW: Call Waiting CONF: CONFERENCE 3PTY: 3rd Party MCID (Malicious Call ID), CUG (Closed User Group), UUS (User to User Signaling), etc.

Slide 1Scenario before ISDNISDN ConceptsScenario after ISDNISDN PrinciplesWhat is ISDN?Advantages of ISDNTypes of ISDNISDN ChannelsISDN ChannelsISDN interfacesSlide 12UNI configurationSlide 14ISDN subscriber system functional configurationUser-network Interface ConfigurationNetwork terminator-type 1 (NT1)Network terminator-type 2 (NT2)Terminal equipment type-1 (TE1)Feature PhoneTerminal equipment type-2 (TE2)Terminal Adapter (TA)Slide 23UNI Access ConfigurationNFASPrimary Access Configuration with NFASISDN servicesISDN ServicesBearer ServicesTele ServicesVideo ConferencingSlide 32Supplementary ServicesSlide 34Supplimentary ServicesSlide 36