Advanced simulations for G.fast, Vectoring & Co: Page 3 of 4

June 24, 2016 // By Daniel Hincapie and Mathias Leibiger
The evolution of copper-based transmission systems has transformed the access network and elevated its complexity. Simulation tools help to enhance the performance of DSL systems: they reproduce the particularities of the provider’s network and use simulation studies to provide realistic performance estimation.

The present modelling and simulation approach allows us to obtain very accurate and detailed models of scenarios like the aforementioned. In addition, multiple aspects impacting systems performance can be considered, such as the number of users of each service,  the relative position between DSLAMs, the target data rates of services, the loop length of users and their position within the cable-binder, settings of transmission systems (transmitted power, spectrum, upstream/downstream ratio, etc.), among others. These aspects are varied and statistically analyzed to obtain average indicators and performance ranges that are important to define providers’ service coverage, portfolio and expansion strategies.

As an example of the usability of our simulation tool for such purposes, figure 2 shows the data rates that G.fast services with loop lengths between 30 m and 430 m can attain for different configuration settings of DSLAMs transmitters. A service provider can use these results to define the services that could be offered in accordance to the achievable data rates.


Fig. 2: The data rates which are achievable with G.fast depend on the loop length. These data rates can be optimized with different settings.

Additionally, if information of the loop length distribution of operator’s network were available, the percentage of potential clients achieving a given data rate, and consequently a given service, could be determined.

Another aspect that concerns broadband service providers nowadays is the coexistence of multiple operators within the same cable binders. As in figure 1, a service provider serving its users with VDSL2 35b from the cabinet may plan to upgrade its services to G.fast. The operator shall then replace a copper segment by optic fiber and locate its DSLAM in a distribution point closer to customer premises, so G.fast can provide higher data rates.

Design category: