Carriers are using RPR, VCAT, LCAS, and GFP to effi ciently
pack packet traffi c on their TDM rings.
RPR over Ethernet (including
prestandard RPR)
RPR or resilient packet ring is standardized in 802.17;
prestandard versions were developed mainly by Cisco, Nortel,
and Extreme.
RPR has gained traction among a minority of providers, and its
demand is holding steady.
Ethernet over WDM All major WDM suppliers offer Ethernet interfaces on their
metro gear, and they are adding switching and other functions.
Ethernet over CWDM/DWDM is used to connect a customer
LAN to other metro locations, POPs or COs, or for data-center
backup.
Ethernet over DSL Industry bodies such as the EFMA have driven the adoption
of Ethernet over copper (VDSL, G.SHDSL), which has been
deployed for MTU/MDU in building Ethernet connections
extensively in Asia.
Ethernet over copper (VDSL (26M), G.SHDSL (2.3M), ADSL2/
ADSL2+, bonding, etc.) is being used each year at an increasing
rate in the local loop.
118 Chapter 3
Metro Ethernet Manufacturer Revenue
The universal appeal of Ethernet is that it is less expensive than other technologies.
Ethernet is becoming an increasingly integral part of metro networks; between 2005 and
2009, Ethernet is making major inroads into metro telecom equipment spending, accumulating
$49.
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