Sidevrgud IRT 0020 loeng 218. sept. 2005

1
Sidevõrgud IRT 0020loeng 2 18. sept. 2005

• Avo Ots
• telekommunikatsiooni õppetoolraadio- ja
  sidetehnika instituut
• avots_at_lr.ttu.ee

2
Backbone network design layers
3
Layering
4
Ülemise ja alumised kihid

• Lower three layers are hop-by-hop
• Next two layers are end-to-end

5
Andmeülekanne (loogiline)
6
Andmeülekanne (füüsiline)
7
Sõnumiülekanne
8
Vahekihid
9
Funktsioonijaotus

• The application knows the requirements best,
  place functionality as high in the layer as
  possible
• If the application can implement a functionality
  correctly, implement it at a lower layer only as
  a performance enhancement
• Think twice before implementing a functionality
  that you believe that is useful to an application
  at a lower layer

10
Töökindlus
router
sender
receiver
L2
L2
L1
L1
L1

• Solution 1 make each step reliable, and then
  concatenate them
• Solution 2 end-to-end check and retry

11
Töökindluse tagamine

• The receiver has to do the check anyway!
• Thus, full functionality can be entirely
  implemented at the upper layer no need for
  reliability from lower layers
• Is there any need to implement reliability at
  lower layers?

12
Routed Backbone
13
Collapsed backbone
14
Central Parkings collapsed backbone
15
ATM Virtual Circuits
16
ATM Encapsulation
17
Protokollid

• http//www.private.org.il/tcpip_rl.html
• http//www.eix.co.uk/Ethernet/
• http//www.mfaforum.org/education/atm_presentation
  s.shtml
• http//www.mfaforum.org/education/atm_cs.shtml
• http//www.mfaforum.org/tech/superdemo_2004.pdf

18
ISO OSI vs DoD mudel
7 6 5 4 3 2 1
19
Võrkude ja teenuste ühendamine
T
G
T
T
T
T
T
R
R
T
20
Spectrum Usage

• Licensed Bands
• 2.5GHz (2.3-2.4 2.5-2.7)
• 3.5GHz (3.3-3.7)

• Unlicensed Band
• 5.8GHz (5.25-5.85)

N. America
2.5 5.8 GHz
W. E. Europe
APAC
3.5 5.8 GHz
3.5 5.8 GHz
Middle East Africa
Central S. America
2.5, 3.5 5.8 GHz
3.5 5.8 GHz
21
Kihtide vahelised seosed
rakendus
esitlus
Võrgurakenduse teenus
seanss
transport
Transporditeenus
võrk
kanal
Võrguteenus
füüsiline
22
Mudeli täiendused
23
Simple Mail Transfer Protocol

• RFC0821 (august 1982) J. Postel, RFC2821
  (aprill, 2001)
• Sõnumite töökindlaks saatmiseks
• Klient-server mudel
• Ühendusele orienteeritud ja kinnitustega
  protokoll
• TCP port 25

24
Lõpulingid

• Kõik RFC-dhttp//www.ietf.org/iesg/1rfc_index.tx
  t
• Infotehnoloogia reeglid Eesti keele ja kultuuri
  keskkonnas EVS 82000http//www.eki.ee/itstandard
  /sisukord.html
• www.ieee.org

25
Kihid
26
APP
APP
UNI
UNI
Application Layer
Service Network
CPE
CPE
NNI
NNI
Service Layer
Switching Network
Switching Network
Switching Network
Transmission Network
Transmission Network
Transmission Layer
NNI
NNI
Physical Layer
Physical Network
Physical Network
Physical Network
NNI
Service Access Point
Physical Interface
Logical Interface
27
Service Independent Block
Service Independent Block
Service Components
Service Independent Block
Service Independent Block
Service Independent Block
Service Logic
Service Logic
Service Control
Service Switching
Service Switch
Service Switch
Service Switch
Service Switch
Service Access
Service Access
Service Access
Service Access
Service Access
Service Access
Session Control (Circuit Switching control)
Call/ Session
Call/ Session
Call/ Session
Call/ Session
Call/ Session
Call/ Session
Call/ Session
28
Server
Client
APP
APP
Application Layer
Server
Server
Server
ISP Applications
ISP Applications
ISP Applications
CPE
CPE
IP
IP
Packet Switching Network
Packet Switching Network
Network Layer
IP
NNI
Transmission Layer
Transmission Network
Transmission Network
Transmission Network
NNI
Service Access Point
Physical Interface
Logical Interface
29
Linear Service Architecture in Legacy Network
Static Services
Two-Dimension Service Architecture in NGN Active
Services
30
(No Transcript)
31
Link

• http//www.mmwave.com/pdf/Alvarion.pdfKõik
  RFC-dhttp//www.ietf.org/iesg/1rfc_index.txt
• Infotehnoloogia reeglid Eesti keele ja kultuuri
  keskkonnas EVS 82000http//www.eki.ee/itstandard
  /sisukord.html
• www.ieee.org