VDSL2 products will bring about a gradual shift from ADSL/ADSL2/ADSL2+ to
Ethernet-based VDSL2; most DSLAM manufacturers will develop multimode VDSL2
ports for DSLAMs with the capability to deploy in ADSL2+ and ADSL modes; some manufacturers
shipped these multimode VDSL2/VDSL1/ADSL2+/ADSL line cards in late 2005
for deployment in COs and RTs; several factors are at play in this transition to VDSL2:
?– VDSL2 is a superset standard that combines ADSL2+ and VDSL1.
?– Port densities of VDSL2 chipsets are already in 48??“72 ports, which is the providers??™
sweet spot for ADSL2+; high-density and low-power consumption in the latest
VDSL2 chipsets fosters the move to multimode DSLAM line cards.
The Ethernet Market Opportunity 117
?– To offer video, voice, and data on DSL, Service Providers are pushing fiber deeper
into their network in North America to take advantage of the higher bandwidths
available only on shorter copper lengths. In Europe and Asia, the loops are generally
shorter; the multirate ports allow providers to deploy VDSL2 for new premium
services to some customers, while still offering interoperable ADSL2+ or ADSL
modes of operation, so they do not have to swap out customer premises equipment
(CPE) for existing customers.
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