Transcript | PSTN ISDN TDM |

| PSTN ISDN TDM |
Presention By:
♠ Murat Irkkan
♠ Mert Kaptan
PSTN
What is PSTN (Public Switched Network)?
 How Data is transferred over PSTN?
 How to connect net over PSTN?

Circuit - Switching
1.
2.
3.
4.

Real Time Voice Transmission
Point To Point Networks
Bandwidth is constant
Data Transmission
PSTN & ISDN & TDM
Circuit – Switching Network
Constant Bandwidth
What is PSTN?

Circuit - Switching telephone network

Carries analog voice

Constant Bandwith
Data Transfer Over PSTN
Digital lines between santrals
 E1 Tranks: 32 channels X 64Kbps

Analog
3 X E1 Trank
Analog
Users
Users
Santral 1
Digital
32X3=96 calls
Santral 2
How to connect net over PSTN?
Modem converts;
Digital data to Analog voice
 28 Kbps
 56 Kbps

How to connect net over PSTN?
Analog
Santral
Analog
Digital
ISDN
What is ISDN
(Integrated Services Digital Network)?
 How it works?
 Types of ISDN?
 What can be done by using ISDN?
 What type of network devices & settings
are needed for the ISDN?
 What is BroadBand ISDN?

What is ISDN?

Integrated Services Digital Network

Allow digital transmission

Support wide range of services over a
channel
Services that ISDN supports
Voice Calls
 Fax Transmission
 Data Transmission & Voice
 Linking to the internet
 Video Conferencing

How Does ISDN Works?
Types of ISDN

ISDN BA / BRI
Basic Access / Basic Rate Interface
Formula:2B+1D
For KOBI’s & Home Users

ISDN PA / PRI
Primary Access / Primary Rate Interface
Formula:30B+1D
For Internet Service Providers & Big Companies
Network Devices & Settings For ISDN
Digital Line
 Network Terminator Max:8terminal
 ISDN Modem (Terminals)


Same as Standart Modem Configuration
What Is BroadBand ISDN?
Max 2MBits/Sec to 1GigaBits/Sec
 Related With ATM
(Asynchronous Transfer Mode)
 Fiber Optics Using
 Atm Cell;

Head
5Bytes
Data
48 Bytes
ATM != ATM
(Asynchronous Transfer Mode)
ATM !=
Advantages of ISDN
Digital Service ~ Less Errors.
 Connection is fast.
 Higher bandwidth.
 Voice, data and video can all be sent over
a single ISDN line.

TDM
What is TDM (Time Division Multiplexing)?
 Theory of Time Division Multiplexing
 Differences between TDM and ATM

Time Division Multiplexing
Continuous,compact and orderly
data transfer
 Voice and image data transfer at the
same time
 Constant bandwidth
 Secure connection

Theory of Time Division Multiplexing
Channel A
Channel A
Sequential
Channel B
Channel B
Channel C
A|B|C|A|B|C
Time Channels
Channel C
TDM vs ATM
References


www.teach-ict.com/as_a2/topics/telephone_systems/telephone_systems/
30 MAY 2006
http://en.wikipedia.org/
30 MAY 2006
◄ The End ►

Presented By;
♠ Murat Irkkan
♠ Mert Kaptan
Any Questions?
” Are Wellcomed ”