| yike |
2008-08-06 23:06 |
PON 前景如何，欢迎大家讨论：
1.1 PON Standards and Evolution
[1] IEEE 802.3ah, CSMA/CD Access Method and Physical Layer Specifications – Amendment: MAC Parameters, Physical Layers and Management Parameters for Subscriber Access Networks, Ethernet in the First Mile Task Force, Jun/2004;
[2] IEEE 802.3av, 10Gb/s Ethernet Passive Optical Network, under standardization;
[3] ITU G.984.1, Gigabit-capable Passive Optical Networks (GPON): General characteristics, 2003;
[4] ITU G.984.2, GPON: Physical Media Dependent (PMD) layer specification, 2003, with amendment 1;
[5] ITU G.984.3, G-PON: Transmission convergence layer specification, 2004, with amendments 1, 2, 3 and an implementer's guide;
[6] ITU G.984.4, G-PON: ONT management and control interface (OMCI) specification, 2004, with amendments 1, 2, 3;
[7] ITU G.984.5, Enhancement band for gigabit capable optical access networks
[8] ITU G.984.6, Gigabit-capable Passive Optical Networks (GPON): Reach extension
[9] ITU G.985, 100 Mbit/s point-to-point Ethernet based optical access system
[10] Project Report on WDM/TDM-PON Presentation, from Internet;
802.3ah EPON History
The IEEE 802.3ah working group was established in 2001 in order to enable Ethernet penetration into the Access Networks. In parallel the EFM Alliance (EFMA) was formed by the participating vendors, to promote Ethernet subscriber access technology and support the IEEE standard effort.[1]
The EFM standard was approved on 24 Jun 2004 and published on 07 Sep 2004 as IEEE 802.3ah-2004. In 2005 it was included into the base IEEE 802.3 standard. The EFMA got absorbed by the Metro Ethernet Forum.
Recently, starting in early 2006, work began on a very high-speed 10 Gigabit/second EPON (XEPON or 10-GEPON) standard (http://www.ieee802.org/3/av/).
ITU G.984 Series
ITU-T Recommendation G.984 is a family of recommendations that defines gigabit passive optical network (GPON) telecommunications access networks. It comprises SIX recommendations as above;
The GPON OMCI recommendation G.984.4 draws heavily on G.983.2, which defines the BPON management model. However, the BPON standards are regarded as mature, and G.984.4 is being revised to stand alone. Future work on the PON management model is expected to appear only in the GPON space.
PON Development and Evolution
Figure 1 1 shows the history of PON development and evolution. Currently (2008), the EPON and the GPON are two best welcomed choices in the PON market. And two new brothers of them with higher speed are under standardization: 10G EPON and WDM PON, maybe 10G/40G GPON will be available to appear, too.
Figure 1 1 History of PON Development and Evolution
[中文]：
EPON (IEEE 802.3ah) 和 GPON (ITU G.984.x)在当前接入层面比较热火朝天， 10G EPON，WDM-PON和可能的10G/40G GEPON的标准化将会助推这股火热的浪潮。
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