10G-EPON ( Eng. 10 Gigabit Ethernet PON ) - technology of passive optical access networks ( PON ), is a development of GEPON and is fully compatible with it. This technology was standardized as part of the 10 Gigabit Ethernet standards group on September 11, 2009 under the name IEEE 802.3av-2009 [1] [2] . The addition to 10G-EPON is regulated by the IEEE 802.3bk-2013 standard , approved on August 23, 2013 [3] .
As with other passive optical network technologies, the 10G-EPON:
- uses a tree topology ( Point To Multipoint , P2MP) fiber-cable system with passive optical branching on splitters ;
- the system operates on a single fiber using the spectral multiplexing of WDM channels .
The 10G-EPON technology makes it possible to use one main station ( Optical Line Terminal , OLT) for 64 subscriber units ( Optical Network Unit , ONU), located at a distance of up to 20 km.
The standard supports two types of configuration: symmetric (10 / 10G-EPON) and asymmetric (10 / 1G-EPON). In an asymmetric configuration, the downstream data stream (from the headend to the subscribers) is transmitted at a speed of 10 Gbit / s, and the upstream streams (from all subscribers to the main station) are transmitted at a total speed of 1 Gbit / s. In a symmetric configuration, both downstream and upstream flows have a speed of 10 Gb / s.
Coexistence with GEPON
The IEEE 802.3av standard pays much attention to the possibility of unimpeded simultaneous operation of EPON at a speed of 1 Gb / s and 10G-EPON at a speed of 10 Gb / s within a single optical distribution network.
In the downstream direction, for transmission of 1 Gbit / s and 10 Gbit / s, waves of different lengths are used: 1 Gbit / s transmission is in the range of 1480-1500 nm, and 10 Gbit / s transmission is in the range of 1575-1580 nm.
In the upstream direction, the wave ranges for 1 Gbit / s and 10 Gbit / s networks partially overlap: 1 Gbit / s uses the 1260–1360 nm range, and 10 Gbit / s signal transmission takes place in the 1260–1280 nm range. Because of this, time division of transmission channels 1 Gbit / s and 10 Gbit / s from different ONUs is required, for which the dual-rate TDMA method is used.
Subscriber units (ONUs) can have different implementations: they can only support 1 Gbit / s speed in both directions, 10 Gbit / s speed in the downstream direction and 1 Gbit / s speed in the upstream, or 10 Gbit / s speed in both directions. The compatibility of different subscriber unit implementations (ONUs) with different headend configurations (OLTs) is shown in the following table:
| OLT implementation | Supported ONU Types |
|---|---|
| Downstream: two wave ranges Upstream: Single Speed | (1) 1G-EPON ONU (2) 10 / 1G-EPON ONU |
| Downstream: single wavelength range Upstream: two speeds | (1) 10 / 10G-EPON ONU (2) 10 / 1G-EPON ONU |
| Downstream: two wave ranges Upstream: two speeds | (1) 1G-EPON ONU (2) 10 / 1G-EPON ONU (3) 10 / 10G-EPON ONU |
See also
- XG-PON - ITU-T G.987.2
Notes
- ↑ IEEE Std 802.3av-2009 . Archived March 10, 2016 on Wayback Machine
- ↑ Standard 10G EPON approved , russianelectronics.ru (October 20, 2009). Date of treatment December 5, 2017.
- ↑ IEEE Std 802.3bk-2013 . Archived August 9, 2017 on Wayback Machine