Kommunikatsioonivõrkude struktuurid ja teenused

Transcription

1 Kommunikatsioonivõrkude struktuurid ja teenused IRT0100 WLAN Loeng 4 K. 24. sept 2008 Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. avots@lr.ttu.ee 1 Traffic & Network Engineering Traffic engineering (TE) Put the traffic where the bandwidth is (Sub-)second/minute time scale Network Engineering (NwE) Put the bandwidth where the traffic is or is soon expected to be 15 minute/hour/day/week time scale Network Planning (NP) Put the equipment, fibers and bandwidth where the traffic is expected to be [in the future] Month/quarter/year time scale Traffic Traffic Engineering Engineering Network Engineering Network Planning 0 second minute 15 min hour day week month quarter year 2 1

2 Traffic Engineering (TE) The process concerned with optimally routing of signals over existing links in a layer network More specific: Optimally assigning available bandwidth to requests (to the network) for bandwidth. It is an intra layer network process TE process in each layer network discovers the links created by network planning and engineering advertises the links and their bandwidth utilisation manages (set-up, release, modify) connections in the layer network; i.e. processes incoming calls for native and client connections restores high grade connections on signal fail [or signal degrade] of the connection It is implemented by the Sub Network Controllers within the layer network 3 Network Engineering The process concerned with optimally selecting topology and bandwidth in a layer network, based on (pro-active) traffic demands expected between any two locations in the network and (re-active) the actual traffic demand It is an inter layer network process NwE process in each layer network advertises the nodes and their ports within the layer network monitors the layer network and determines if/when a new (topological) link should be added or an existing link should be modified or released, based on the network provider's policy determines best set of connections between ports in the layer network requests those connections to be set up by its server layer networks; i.e. generates outgoing calls for client connections It is implemented by the (distributed) Network Engineering Controllers (NEC) within the layer network 4 2

3 Network Planning The process concerned with optimally selecting equipment, fiber [medium] and bandwidth based on expected traffic growth, also taking into account inherent uncertainties service levels (availability, service delivery times) total network cost (capex and opex) NP process is a multi layer network process Physical: fiber infrastructure and topology Logical: architecture and topology: hierarchical levels ring / mesh / star granularity It is implemented by off-line planning algorithms and tools quantitatively evaluate alternatives: dimensioning cost calculations, business modelling 5 Interfaces - Layer Networks LOVC PN UNI LOVC Link LOVC VPN #1 LOVC VPN #2 HOVC Permanent Connection [non-switched] HOVC VPN I-NNI PC I-NNI I-NNI HOVC Link UNI STM-N Physical Interface HOVC PN Component Link PN: Public Network VPN: Virtual Private Network 6 3

4 Ressursijaotus Dedicated Bandwidth Circuits Shared Bandwidth Circuits Dedicated Transport & Transfer Rate In Network Actual Data Rate Usage vs. Time Sum of Aggregate Bandwidth Much Less Wasted Bandwidth Mbps Mbps Time Wasted Bandwidth Time Multiple Data Customers in Shared Trunk Bandwidth 7 8 4

5 Võrgu planeerimine The process concerned with optimally selecting equipment, fiber [medium] and bandwidth based on expected traffic growth, also taking into account inherent uncertainties service levels (availability, service delivery times) total network cost (capex and opex) NP process is a multi layer network process Physical: fiber infrastructure and topology Logical: architecture and topology: hierarchical levels ring / mesh / star granularity It is implemented by off-line planning algorithms and tools quantitatively evaluate alternatives: dimensioning cost calculations, business modelling 9 Maksumus $500 installation per access point If equipment and project is funded through onetime capital dollars, then the monthly rate for operations and maintenance is: $25 per month per access point 10 5

6 Conclusions Wireless is very addictive. It will be very popular. It will be very problematic. It will cost more than you expect In offices, it is not a replacement for wired. The dust has not settled. 11 Terminali mobiilsust tagav kõrgkäideldavusega WiFi-võrk TTÜ teine õppehoone Sügis 2007 > rahastamine Eesti Telekom Kevad/suvi/sügis 2008 > valmisehitamine AS Võrguvara & TTÜ infotehnoloogia osakond 12 6

7 Riistvara Nortel WLAN Security Switch keskkontrollerina, kiudoptilise ühendusega (2 Gbit/s) Tehnikaülikooli tuumvõrku Kokku 51 tugijaama Nortel WLAN 2332 Access Point IEEE a/b/g, mis ühenuvad keskkontrolleriga virtuaalkohtvõrgu (VLAN) tehnikaid kasutades. Tugijaamad on hajali paigutatud neljal teise õppehoone korrusel ja füüsika auditooriumis Tugijaamade kaugtoite (PoE) seadmestik 13 Tarkvara Nortel WLAN Management System Nortel WLAN Security Switch Management Planning Tool 14 7

8 Põhinõuded (1) Lairiba raadiovõrkude (WLAN) üldlevinud ja standardiseeritud raadiotehnoloogiat (standardid IEEE a; b/g) kasutav võrgulahendus TTÜ teises õppehoodes peab tagama hoonesisese mobiilsete (autenditud) WLAN terminalide: sülearvutid, WLAN liidesega mobiilterminal (telefon, PDA) jne kasutuse, mistarvis raadiosignaal peab ruumides olema kõikides kasutuskohtades vajaliku tugevusega ja olema kavandatud selliselt, et tugijaamade signaal ulatuks võimalikult vähe väljapoole õppehoonet 15 Põhinõuded (2) WLAN lahendus peab olema keskhaldusega, kus manageeritakse keskturvaseadet ja lahendust tervikuna, mitte aga üksikuid tugijaamu eraldi WLAN lahendus peab toetama enamlevinud turvastandardeid näitena: WPA/WPA2, i/802.1x, EAP-TLS, EAP-TTLS, EAP- MD5, PEAP-TLV, X.509, MAC autentimine, jpt. 16 8

9 Põhinõuded (3) WLAN lahendus peab võimaldama pidevalt jälgida raadiovõrku ja terminale ning automaatselt valima ja häälestama optimaalselt raadiokanaleid ja tugijaamade väljundvõimsusi, tagades piirkonna tugijaamade koormuse ühtlase jaotuse ja võrdsed tingimused terminalidele. Samuti peab automaatselt käivituma, üksiku tugijaama rikke korral, töökorras tugijaamade koormuste ja võimsuste reguleerimine, tagades kvaliteetse signaalilevi. 17 Nortel WLAN 2300 Series A simple and powerful wireless services platform WLAN Access Point 2330A One access point with the flexibility to meet all indoor requirements Portfolio of security switches with the right model for any architecture and any sized network WLAN Security Switches (WSS) WLAN Management Software (WMS) System One feature-rich management system for all administrator requirements 18 9

10 Wireless LAN New Hardware Wireless LAN Security Switch 2382 Wireless Access Point 2332 Wireless Location Engine 2340 System Operation Enhancements AP/DAP Unification AP Bias Enhancement Distributed Forwarding Enforceable Data Rates Enhanced RF Load Balancing Logout for Web-AAA Users Mobility Domain Seed Redundancy One-Hop Mesh Configuration Integrated Services Location Services Voice Enhancements Voice Monitoring Security Enhancements Password Management WMS Enhancements Configuration Wizards RF Analysis RF Link Testing RF Visualizations Reporting 19 Release 6.0 Content New Hardware Wireless LAN Security Switch 2382 Wireless Access Point 2332 Wireless Location Engine 2340 System Operation Enhancements AP/DAP Unification AP Bias Enhancement Distributed Forwarding Enforceable Data Rates Enhanced RF Load Balancing Logout for Web-AAA Users Mobility Domain Seed Redundancy One-Hop Mesh Configuration Integrated Services Location Services Voice Enhancements Voice Monitoring Security Enhancements Password Management Management Enhancements Configuration Wizards RF Analysis RF Link Testing RF Visualizations Reporting 20 10

11 WLAN Handset 6100 Series The WLAN Handset 6100 Series builds upon the feature-rich capabilities of the WLAN Handset 2200 Series but adds enhanced wireless capabilities (IEEE a/b/g radio), larger backlit display, expanded Push-to-Talk channels (6140), extended capacity battery options and new accessories IEEE a/b/g WLAN Application Gateway 2246 WLAN IP Telephony Manager Nortel Communication Server Platforms/Infrastructure 6140 IEEE WLAN Infrastructure Nortel WLAN & Telephony Infrastructure Components Nortel WLAN Handsets (UNIStim firmware) 21 SMB Portfolio What s in the Portfolio? Desktop FE/GE Ethernet Switching WLAN Mobility BES50 BES50FE-12T PWR BES50FE-24T PWR BES50GE-12-T PWR BES50GE-24-T PWR Stackable FE Rack-mounted FE BES100 BES110-24T BES110-48T BES T PWR BES T PWR BES200 BES210-24T BES210-48T BES T PWR BES T PWR MultiService Gateway BB Router BSR222 BSR252 BSG4 BES T BES T BES T PWR BES T PWR WLAN 2300 series BB Router Services Gateway BES1000 Access Points & Security Switch Access Points BAP120 Secure Routing Rack-mounted GE WAN Router SR 1000 series Services Gateway BSG8 WAN Router SR3120 Services Gateway BSG12 series 22 11