The ITU reached agreement on two new standards for Gigabit-capable Passive Optical Networks (G-PONs). Both standards cover symmetrical and asymmetrical (upstream/downstream) systems. The new standards are:
- ITU Recommendation G.984.1, which describes the general characteristics of a gigabit-capable PON system such as architecture, bit rates, reach, signal transfer delay, split ratio protection and security.
- ITU Recommendation G.984.2, which describes a flexible optical fiber access network capable of supporting the bandwidth requirements of business and residential services. It covers systems with nominal line rates of 1.25 Gbps and 2.5 Gbps in the downstream (Central Office to customer) direction and 155 Mbps, 622 Mbps, 1.5 Gbps and 2.5 Gbps in the upstream (customer to Central Office) direction. This represents approximately twice the capability of the previous release of the standards (G.983.4 and G.983.5).
http://www.itu.int/newsroom/press_releases/2003/04.html