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Symmetric and Asymmetric 10GEPON

Keywords of 10GEPON Technology

PMA: Physical Medium Attachment; PHY: Physical Layer Device; PMD: Physical Medium Dependent; RS: the reconciliation sublayer; PCS: physical coding sublayer; GMII: Gigabit Media Independent Interface; XGMII: 10 Gigabit MII; MPCP:MultiPoint Control Protocol; OAM: Operations, Administrations, and Maintenance

  The development direction of optical access is mainly higher bandwidth and greater user access capability. This blog introduces the main new generation of access network technologies that are emerging and are expected to be widely used in the future, including 10GE PON and XG-PON. As well as WDM-PON, the functional reference model, main technical points and applications of each technology are introduced.

10GEPON Overview

  With the gradual development of high-volume broadband services such as IPTV, high-definition television, and online games, the bandwidth demand of users continues to increase and accelerate. The bandwidth requirement per user will reach 50 to 100 Mbps, whether it is EPON or GPON technology. Some PON port bandwidths will have new bandwidth bottlenecks. Operators, equipment providers, and technology developers are all seeking new ways to meet bandwidth requirements for next-generation applications.
  To this end, the IEEE has actively developed the IEEE802.3av standard, which was established since 2006 and was formally promulgated in September 2009. Since then, 10GEPON technology has moved toward the stage of broadband access. The goal of 10GEPON technology is to realize the coexistence of 10GEPON ONUs and 1GEPON ONUs under the same PON port, supporting symmetrical 10gbps uplinks and downlinks, or 10 Gbps downlinks and 1 Gbps uplinks, or a combination of both. The IEEE802.3av standard focuses on the research of physical layer technology and uses the IEEE 802.3av MPCP protocol of EPON as much as possible, so that 10GEPON has a good inheritance, and provides operators with a strict solution for smoothly upgrading from 1GEPON to 10GEPON. Maximize the protection of the operator’s investment.

10GEPON function reference model

10GEPON technology layering diagram

  IEEE802.3av has identified two physical layer modes: one is an asymmetric mode, that is, 10 Gbps downstream and 1 Gbps upstream (corresponding to the PMD layer signal rate, under the behavior of 10.32125 GBd, on the behavior of 1.25 GBd); the other is symmetrical The mode, that is, the uplink and downlink rates are 10 Gbps (corresponding to the PMD layer signal rate, the lower behavior of 10.32125 GBd, on the behavior of 10.32125 GBd); asymmetric mode can be considered an over-representation of the symmetric mode, the demand for upstream bandwidth in the previous period In situations where the cost is low and the cost is sensitive, an asymmetric model can be used. With the development of the business and the advancement of technology, the symmetry model is gradually over-extended. The 10GEPON protocol stack hierarchy in symmetric mode and the corresponding relationship with the ISO/IEC OSI reference model are shown in Figure above.

  It should be noted that only the protocol layering when accessing the ONU with 10GE uplink 10GE downlink capability is shown here.
The 10GEPON protocol stack in asymmetric mode is slightly different in layering, mainly because the uplink rate interface between the PCS sub-layer and the RS sub-layer is different, as shown in Figure below. 

Symmetric and Asymmetric 10GEPON‘s Function Reference Model

  It should also be noted that, for the sake of clarity, only the protocol layering when accessing ONUs with 10GE downlink 1GE uplink capability is shown.

The wavelength allocation of Symmetric (10/10 Gbps) and Asymmetric (10/1 Gbps) 10GEPON

  The wavelength assignment of IEEE802.3av is shown in Figure 3, and the downlink uses the 1575 to 1580 nm band. The uplink overlaps the wavelength of 1GEPON and uses the 1260 to 1280 nm band. From the perspective of wavelength allocation, uplink 10 Gbps upstream wavelengths and 1 Gbps upstream wavelengths are superimposed. Therefore, 1 Gbps rate ONUs and 10 Gbps rate ONUs need to use time division multiplexing to send uplink data. The 10 Gbps rate in the downlink and the 1 Gbps rate are separate, ensuring that the downlink data has higher bandwidth.

The wavelength allocation of actual fiber optic communication (from google)

  In the symmetric mode, the center wavelength of the uplink is 1270 nm, the wavelength range is 1260-1280 nm, the center wavelength of the downlink is 1577 nm, and the wavelength range is 1575-1580 nm.
  In the asymmetric mode, the center wavelength of the uplink is 1310 nm, the wavelength range is 1260 to 1360 nm, the center wavelength of the downlink is 1577 nm, and the wavelength range is 1575 to 1580 nm

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