sidevõrgud irt 0020 loeng 218. sept. 2005
DESCRIPTION
Sidevõrgud IRT 0020 loeng 218. sept. 2005. Avo Ots telekommunikatsiooni õppetool raadio- ja sidetehnika instituut [email protected]. Backbone network design layers. Layering. Application. Application. Transport. Transport. Network. Network. Network. Datalink. Datalink. Datalink. - PowerPoint PPT PresentationTRANSCRIPT
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Sidevõrgud IRT 0020
loeng 2 18. sept. 2005
Avo Ots
telekommunikatsiooni õppetoolraadio- ja sidetehnika instituut
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Backbone network design layers
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Layering
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Ülemise ja alumised kihidLower three layers are hop-by-hop
Next two layers are end-to-end
Application
Transport
Network
Datalink
Physical
Application
Transport
Network
Datalink
Physical
Network
Datalink
Physical
Physical medium
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Andmeülekanne (loogiline)
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
networklink
physical
data
data
data
transport
transport
ack
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Andmeülekanne (füüsiline)
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
networklink
physical
data
data
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Sõnumiülekanne
datagram
applicationtransportnetwork
linkphysical
applicationtransportnetwork
linkphysical
source destination
M
M
M
M
Ht
HtHn
HtHnHl
M
M
M
M
Ht
HtHn
HtHnHl
message
segment
frame
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VahekihidTelnet FTP
packetradio
coaxial cable
fiberoptic
HTTP
HTTPTelnet FTP
packetradio
coaxial cable
fiberoptic
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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
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Töökindlus
• Solution 1: make each step reliable, and then concatenate them
• Solution 2: end-to-end check and retry
L1
L2
L1
sender receiver
L1
L2
router
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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?
L1
L2
L1
sender receiver
L1
L2
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Routed Backbone
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Collapsed backbone
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Central Parking’s collapsed backbone
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ATM Virtual Circuits
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ATM Encapsulation
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Protokollidhttp://www.private.org.il/tcpip_rl.html
http://www.eix.co.uk/Ethernet/
http://www.mfaforum.org/education/atm_presentations.shtml
http://www.mfaforum.org/education/atm_cs.shtml
http://www.mfaforum.org/tech/superdemo_2004.pdf
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ISO OSI vs DoD mudel
Process/
Application
Host-to-Host
Internet
Network Access
7654321
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T
T G T
T R R
T T
T
Võrkude ja teenuste ühendamine
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N. AmericaN. America
Central & S. AmericaCentral & S. America
W. & E. EuropeW. & E. Europe
Middle East &Middle East & AfricaAfrica
APACAPAC2.5 & 5.8 GHz2.5 & 5.8 GHz
2.5, 3.5 & 5.8 GHz2.5, 3.5 & 5.8 GHz
3.5 & 5.8 GHz3.5 & 5.8 GHz
3.5 & 5.8 GHz3.5 & 5.8 GHz
3.5 & 5.8 GHz3.5 & 5.8 GHz
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)
Spectrum Usage
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Kihtide vahelised seosed
rakendus
esitlus
seanss
transport
võrk
kanal
füüsiline
Võrguteenus
Võrgurakenduse teenus
Transporditeenus
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Mudeli täiendused
DiffServDiffServ
7 Application7 Application
6 Presentation6 Presentation
5 Session5 Session
4 Transport4 Transport
3 Network3 Network
2 Data Link2 Data Link
1 Physical1 Physical
e. g. Workflowe. g. Workflow
G.711 / G.723.1 / G.729G.711 / G.723.1 / G.729
H.323 / H.450 / RTPH.323 / H.450 / RTP
TCP / UDPTCP / UDP
IPIP
MACMAC
Transmission MediumTransmission Medium
802.1 D802.1 D
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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
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Lõpulingid• Kõik RFC-d:
http://www.ietf.org/iesg/1rfc_index.txt
• Infotehnoloogia reeglid Eesti keele ja kultuuri keskkonnas EVS 8:2000http://www.eki.ee/itstandard/sisukord.html
• www.ieee.org
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Kihid
7
6
5
4
3
2
1 Füüsiline (ühendus)
Kanal
Võrk
Transport
Seanss
Esitlus
Rakendus Application
Presentation
Session
Transport
Network
Data link
Physical
SSL, WSP
RFC 791 IP,RFC 792 ICMP
TCP RFC 793, UDP RFC 768
WAE, HTTP, RFC821,822
ISO 8859-15
IEEE 802.11a
Cat5, RS-232D
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Physical NetworkPhysical Network
Transmission NetworkTransmission Network
CPECPE CPECPE
Physical NetworkPhysical Network Physical NetworkPhysical Network
Transmission NetworkTransmission Network
Switching
Network
Switching
Network
Application
Layer
Service
Layer
Transmission
Layer
Physical
Layer
PhysicalInterface
LogicalInterface
UNI UNI
NNI NNI
NNI
NNI NNI
ServiceAccessPoint
APPAPP APPAPP
Switching
Network
Switching
NetworkSwitching
Network
Switching
Network
Service
Network
Service
Network
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Service
Access
Service
Access
Service LogicService Logic
ServiceIndependent
Block
ServiceIndependent
Block
Service SwitchService Switch
Service
Control
Service
Switching
Service
Access
ServiceIndependent
Block
ServiceIndependent
Block
Service SwitchService Switch Service SwitchService Switch Service SwitchService Switch
Service LogicService Logic
Service
Access
Service
AccessService
Access
Service
AccessService
Access
Service
AccessService
Access
Service
Access
Service
Components
ServiceIndependent
Block
ServiceIndependent
Block
ServiceIndependent
Block
ServiceIndependent
Block
ServiceIndependent
Block
ServiceIndependent
Block
Call/
Session
Call/
SessionCall/
Session
Call/
SessionCall/
Session
Call/
SessionCall/
Session
Call/
SessionCall/
Session
Call/
SessionCall/
Session
Call/
SessionCall/
Session
Call/
Session
Session Control
(Circuit
Switching control)
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Transmission
Network
Transmission
Network
Packet
Switching Network
Packet
Switching Network
ISP
Applications
ISP
Applications
CPECPE CPECPE
Transmission
Network
Transmission
NetworkTransmission
Network
Transmission
Network
Packet
Switching Network
Packet
Switching Network
ISP
Applications
ISP
ApplicationsISP
Applications
ISP
Applications
Application
Layer
Network
Layer
Transmission
Layer
PhysicalInterface
LogicalInterface
IP IPIP
NNI NNI
ServiceAccessPoint
APPAPP APPAPPServer Server Server
ServerClient
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ATerminal
ATerminal
B Terminal
B Terminal
APortal
BPortal
TransmissionTransmissionAccessAccess AccessAccess
Session ServiceSession Service
Control ServiceControl Service
A Home ServiceA Home Service B Home ServiceB Home ServiceA User Service Management
A User Service Management
B User ServiceManagement
B User ServiceManagement
TransmissionTransmissionAccess ServiceAccess Service Access ServiceAccess Service
TerminalTerminal TerminalTerminalTelecom basic service/call controlTelecom basic service/call control
Off-line customer managementOff-line customer management
Extended call control and IN chargingExtended call control and IN charging
Linear Service Architecture in Legacy Network: Static Services
Two-Dimension Service Architecture in NGN: Active Services
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Link• http://www.mmwave.com/pdf/
Alvarion.pdfKõik RFC-d:http://www.ietf.org/iesg/1rfc_index.txt
• Infotehnoloogia reeglid Eesti keele ja kultuuri keskkonnas EVS 8:2000http://www.eki.ee/itstandard/sisukord.html
• www.ieee.org