Difference between revisions of "Advanced WAN Services Design Considerations"
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Revision as of 16:59, 2 September 2010
Kapitel 4 fra CCDP ARCH bogen.
This article is under development....Contents
Avancerede WAN Services
Optiske forbindelser
Optiske forbindelser mellem ISP'erne og kunderne har i en årrække anvendt teknologier som
- SDH som er en tids multiplekset TDM transportteknologi til indpakning af Voice og Data.
- WDM,CWDM og DWDM som er teknologier til at sende flere bølgelængder igennem samme fiber
ISP'erne er ved at skifte SDH og ATM baserede løsninger ud med Ethernet baserede løsninger, både på grund af prisen men også på grund af kompleksiteten. Derfor vil vi primært anvende Ethernet baserede løsninger på dette kursus.
RPR
| Resilient Packet Ring eller RPR er en lag to teknologi som kan køre over SDH eller Gigabit ethernet. RPR er en optisk løsning. RPR er beskrevet i IEEE 802.17 |
Eksterne henvisninger |
CWDM
Coarse Wavelength Division Multiplexing
- Up to 16 channels
- 20nm apart
- GBIC/SFP interfaces for SM Fiber
- ITU-T G.694.2
- Inexpensive
DWDM
Dense Wavelength Division Multiplexing
- Up to 160 channels
- About 0.8 nm Spacing
- Expensive
Metro Ethernet
Metro Ethernet is transparent for the costumer. They only need a Ethernet connection and not ISDN/PPP/or other old Serial connection.
- Pure Ethernet MAN
- SONET/SDH-Based Ethernet MAN
- MPLS-Based Ethernet MAN
Metro Ethernet LAN Services
- Ethernet Private Line (EPL) service: A port-based point-to-point Ethernet-line (Eline) service that maps Layer 2 traffic directly onto a TDM circuit
- Ethernet Relay Service (ERS): A point-to-point VLAN-based E-line service that is used primarily for establishing a point-to-point connection between customer routers
- Ethernet Wire Service (EWS): A point-to-point port-based E-line service that is used primarily to connect geographically remote LANs over a P-network
- Ethernet Multipoint Service (EMS): A multipoint-to-multipoint port-based emulated LAN (ELAN) service that is used for transparent LAN applications
- Ethernet Relay Multipoint Service (ERMS): A multipoint-to-multipoint VLANbased ELAN service that is used primarily for establishing a multipoint-to-multipoint connection between customer routers
