4 Typical Deployment Scenarios for EoS and MSPPs
318 Chapter 11
?– High-capacity multi-service transport systems This catch-all includes high
capacity Dense Wavelength Division Multiplexing (DWDM) systems such as Fujitsu??™s
FLASHWAVE 7500, and new devices that combine Ethernet switching, SONET
MSPP functionality (including EoS), and DWDM technology, such as Alcatel??™s 1850
TSS and Fujitsu??™s FLASHWAVE 9500.
EoS Protocol Enhancements
Another significant EoS technology trend comprises enhancements to the EoS mapping
protocols. Implementations of GFP, VCAT, and LCAS continue to grow in quantity,
quality, and interoperability. This technology triumvirate forms a solid technology foundation
for the delivery of Carrier Ethernet services over SONET networks. However,
beyond GFP/VCAT/LCAS are additional protocols that augment EoS to improve its
ability to deliver Ethernet services in some cases.
Resilient packet ring (RPR) technology, based on the IEEE 802.17 standard [14], can
improve SONET??™s ability to support E-LAN services in some scenarios. RPR provides
a MAC layer on top of SONET that enables an RPR/SONET ring to act as a shared
LAN (with built-in multipoint capabilities).
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