communication networks i lecture 11 advanced computer networks (acn) 545
DESCRIPTION
Mr. Thilak d e Silva. BSc . Eng., MSc , CEng , FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA). Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545. Today's Agenda. PSTN Signaling ISDN PDSN Internet Connections. Session Outcomes. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/1.jpg)
Communication Networks ILecture 11
Advanced Computer Networks (ACN) 545
Mr. Thilak de Silva.BSc. Eng., MSc, CEng, FIE(SL), FIET(UK), CITP(UK), MBCS(UK), MIEEE (USA)
M.Sc. in IT - Year 1 Semester II - 2012
![Page 2: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/2.jpg)
Today's Agenda
PSTN Signaling ISDN PDSN Internet Connections
M.Sc. in IT - Year 1 Semester II - 2012
![Page 3: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/3.jpg)
Session Outcomes
At the end of this session you will understand about the Public Switch Telephone Network, Signaling, Integrated Services Digital Network and Internet connections.
M.Sc. in IT - Year 1 Semester II - 2012
![Page 4: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/4.jpg)
PSTN – Public Switch Telephone network
PSTN contains an Access network, Transmission Network, Switching and Signaling.
Use TDM System Time Slots.
It’s a Real time dedicated connection.
The bandwidth is wasted in two copper wires in the Access networks as well as in between exchanges.
M.Sc. in IT - Year 1 Semester II - 2012
![Page 5: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/5.jpg)
PSTN – Public Switch Telephone network
M.Sc. in IT - Year 1 Semester II - 2012
2 Copper Wires
TDM - TS
Circuit Switching
Waste of Bandwidth –Use only 4 Khz
Real time dedicated connection
64 Kbps
Occupancy
Time
64 Kbps
Idle
Because all the time 64Kpbs are not used bandwidth is wasted
![Page 6: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/6.jpg)
Signaling Between Exchanges
Has two types,▪Channel Associated Signaling – C5, R2▪Separate Signaling Network – C7
M.Sc. in IT - Year 1 Semester II - 2012
![Page 7: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/7.jpg)
Channel Associated Signaling In PSTN if data transmission is needed
first we need to convert the data signal in to an analog signal by using a modem.
V. Standards are used when sending data through a PSTN network.
M.Sc. in IT - Year 1 Semester II - 2012
Modem
Data
9.6 kbps14.4 Kbps19.2 Kbps28.2 Kbps54 Kbps
V.35
![Page 8: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/8.jpg)
Channel Associated Signaling
Here TS 16 (16th Time slot) of a Primary Multiplexer is allocated for signaling.
We can directly connect the customer equipment to the Multiplexer. (bypassing the exchange) That is called a leased line connection.
M.Sc. in IT - Year 1 Semester II - 2012
![Page 9: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/9.jpg)
Leased Line
We can directly connect the customer equipment to the Multiplexer. (bypassing the exchange) That is called a leased line connection.
No Switching. Point to point connection.
M.Sc. in IT - Year 1 Semester II - 2012
Switch MUX
Higher
Order MUX
Transmission Network
Leased line 64Kbps
![Page 10: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/10.jpg)
Leased Line
Data Mux s (A Special primary mux ) can be used to connect leased lines.
Cost of leased line connections are very expensive compared to dial-up connections. M.Sc. in IT - Year 1 Semester II -
2012
Data MUX
2Mbps
N * 64 Kbps
Leased Circuits
Inputs are configurable
![Page 11: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/11.jpg)
Separated Signaling Network – C7
Signaling network is separated from the switching network.
Signaling network became a packet switched network.
Therefore C7 signaling supports transmission of both voice and data through the PSTn network.
M.Sc. in IT - Year 1 Semester II - 2012
![Page 12: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/12.jpg)
ISDN - Integrated Services Digital Network
M.Sc. in IT - Year 1 Semester II - 2012
Exchange
OR
64 Kbps
Digital Phone
Analog Phone
2 * 64 Kbps
+ 16 Kbps for signaling
Network Interface
64 Kbps
64 Kbps
TA
![Page 13: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/13.jpg)
ISDN - Integrated Services Digital Network
ISDN users circuit switching An ITU-T standard. Two physical interfaces,
BRI -> 2B+D PRI -> 30B+D
BISDN – Broadband ISDN
Provides up to 155 Mbps of speed Did not actually implemented
M.Sc. in IT - Year 1 Semester II - 2012
![Page 14: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/14.jpg)
PSDN – Public Switch Data network
Introduced by ITU-T Eg: x.25
M.Sc. in IT - Year 1 Semester II - 2012
Network Interface
Physical layer
Network Interface
2 copper wires
Packet switch
Data Link Layer – LAP-B
Network Layer
X.25
LAP-B
X.25
![Page 15: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/15.jpg)
PSDN – IP
ISOC developed another public switch network called IP network.
They used routers instead of packet switches. A Router can be placed either in customer premises or in service providers premises.
M.Sc. in IT - Year 1 Semester II - 2012
![Page 16: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/16.jpg)
PSDN – IP
This is normally a private network
M.Sc. in IT - Year 1 Semester II - 2012
IP
HDLC, PPP
RS -232
![Page 17: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/17.jpg)
Getting Internet Connection
A customer need a service provider to get connected to internet/ public network.
M.Sc. in IT - Year 1 Semester II - 2012
Private Network
Public Network
ISP
Dial up
![Page 18: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/18.jpg)
Getting Internet Connection
M.Sc. in IT - Year 1 Semester II - 2012
PSTN
Customer
Modem Modem band + Remote Access server
ISP
Internet
![Page 19: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/19.jpg)
Getting Internet Connection
ISP a need to get a leased line from a bigger Service provider.
Small ISP Telecom Tier 1
Operators
M.Sc. in IT - Year 1 Semester II - 2012
![Page 20: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/20.jpg)
Getting Internet Connection
M.Sc. in IT - Year 1 Semester II - 2012
ADSL modem
DSLAM
ADSL modem bank
PE route
r
MPLS
2 copper wires
![Page 21: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/21.jpg)
Getting Internet Connection
Instead of two copper wires we can have a fiber ring in the access network.
Can get higher bit rates. PON , FTTH, FTTN .
M.Sc. in IT - Year 1 Semester II - 2012
PE Routers
Metro Ethernet box
![Page 22: Communication Networks I Lecture 11 Advanced Computer Networks (ACN) 545](https://reader030.vdocuments.us/reader030/viewer/2022032612/56813363550346895d9a797c/html5/thumbnails/22.jpg)
Thank You…
M.Sc. in IT - Year 1 Semester II - 2012