What is Gfast?

• Gfast (ITU-T G.9700/9701) is a fiber-to-the-distribution point (FTTdp) architecture that provides fiber-to-the-home like speeds with the self-installation aspects of ADSL.
• Utilizes very short loop lengths, typically no longer than 400m, but is optimized for 250m.
• Unlike VDSL which uses Frequency Division Duplexing (FDD), Gfast uses Time Division Duplexing (TDD).
• Advantages include a variable DS/US asymmetry ratio, support for low power states, and discontinuous operation which allows trade-offs of throughput vs. power consumption.

What are the real benefits of Gfast A3?

• Gfast A3 offers higher DENSITY, lower CAPEX (cost/port) as well as lower OPEX (minimized loop conditioning). A Gfast A3 vectoring group scales to 96 ports which applies to some buildings that use OSP wiring.

What are the advantages of cDTA?

• cDTA improves Gfast upstream performance by four or five times by dynamically balancing upstream and downstream capacity to match residential traffic patterns in real-time.
• Enables symmetrical gigabit services with Gfast and puts service providers in a leadership position against their competition as they can exceed the speeds of DOCSIS-based offerings.

How does vectoring enable service providers to reap the full benefits of Gfast?

• Vectoring has eliminated many of the issues and concerns related to using higher frequencies on twisted copper pairs (e.g. generation of crosstalk).
• Service providers utilize vectoring to cancel this crosstalk and allow each line to perform to its potential. This noise cancellation technology allows for higher speeds, both downstream and upstream.
• Vectoring also brings significant performance gains.