Last modified: 28 April 2008

Transcription

1 Last modified: April 00 Amendment to IEEE Std GEPON 0 0. Overview Ethernet for subscriber access networks, also referred to as Ethernet in the First Mile, or EFM, combines a minimal set of extensions to the IEEE 0. Media Access Control () and Control sublayers with a family of Physical Layers. These Physical Layers include optical fiber and voice grade copper cable Physical Medium Dependent sublayers (PMDs) for point to point (PP) connections in subscriber access networks. EFM also introduces the concept of Ethernet Passive Optical Networks (EPONs), in which a point to multipoint (PMP) network topology is implemented with passive optical splitters, along with extensions to the Control sublayer and Reconciliation sublayer as well as optical fiber PMDs to support this topology. In addition, a mechanism for network Operations, Administration, and Maintenance (OAM) is included to facilitate network operation and troubleshooting. 0BASE LX extends the reach of 0BASE X to achieve km over conventional single mode two fiber cabling. The relationships between these EFM elements and the ISO/IEC Open System Interconnection () reference model are shown in Figure for PP topologies, Figure for symmetric, Gb/s EPON, Figure for symmetric G EPON and Figure for asymmetric G EPON topologies. SICAL MII Cu PCS Cu TC PMA PMD MEDIUM BASE TL PASS TS An important characteristic of EFM is that only full duplex links are supported. A simplified full duplex is defined in Annex A for use in EFM networks. PMP applications must use this simplified full duplex. EFM Copper applications may use either this simplified full duplex or the Clause operating in half duplex mode as described in... All other EFM PP applications may use either this simplified full duplex or the Clause operating in full duplex mode. EFM architecture is further @@ by the addition of G EPON. G EPON extends the clauses of symmetric, Gb/s EFM EPON to support symmetric ( Gb/s MII 0BASE X PCS PMA = GIGABIT MEDIA INDEPENDENT INTERFACE = MEDIUM DEPENDENT INTERFACE MII = MEDIA INDEPENDENT INTERFACE OAM = OPERATIONS, ADMINISTRATION, AND MAINTENANCE PMD MEDIUM 0BASE BX 0BASE LX Figure Architectural positioning of EFM: PP Topologies HIGHER LLC (LOGIC LINK CONTROL) OAM (OPTIONAL) CONTROL (OPTIONAL) RECONCILIATION 00BASE X PCS PMA PMD MEDIUM 00BASE BX 00BASE LX PCS = SICAL CODING SUBLAYER = SICAL LAYER DEVICE PMA = SICAL MEDIUM ATTACHMENT PMD = SICAL MEDIUM DEPENDENT

2 Last modified: April 00 Amendment to IEEE Std GEPON 0 0 SICAL SICAL = GIGABIT MEDIA INDEPENDENT INTERFACE = MEDIUM DEPENDENT INTERFACE OAM = OPERATIONS, ADMINISTRATION & MAINTENANCE OLT = OPTICAL LINE TERMINAL HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) PCS (Clause ) FEC (Clause ) PMA (Clause ) PR type PMD (Clause 0) PCS (Clause ) FEC (Clause ) PMA (Clause ) PR type PMD (Clause 0) Figure Architectural positioning of EFM: PMP symmetric Gb/s EPON architecture ( Gb/s downstream, Gb/s upstream) HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) PON medium Optical distributor combiner(s) OLT ONU ONU = OPTICAL UNIT PCS = SICAL CODING SUBLAYER = SICAL LAYER DEVICE PMA = SICAL MEDIUM ATTACHMENT PMD = SICAL MEDIUM DEPENDENT

3 Last modified: April 00 Amendment to IEEE Std GEPON SICAL SICAL X= GIGABIT MEDIA INDEPENDENT INTERFACE = MEDIUM DEPENDENT INTERFACE OAM = OPERATIONS, ADMINISTRATION & MAINTENANCE OLT = OPTICAL LINE TERMINAL HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) PCS (Clause ) FEC (Clause ) PMA (Clause ) PR type PMD (Clause ) X PCS (Clause ) FEC (Clause ) PMA (Clause ) PR type PMD (Clause ) Figure Architectural positioning of EFM: PMP symmetric G EPON architecture ( Gb/s downstream, Gb/s upstream) HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) X PON medium Optical distributor combiner(s) OLT ONU ONU = OPTICAL UNIT PCS = SICAL CODING SUBLAYER = SICAL LAYER DEVICE PMA = SICAL MEDIUM ATTACHMENT PMD = SICAL MEDIUM DEPENDENT 0 0

4 Last modified: April 00 Amendment to IEEE Std GEPON 0 0 SICAL SICAL PMD and described in Clause HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) X PCS (Clause ) FEC (Clause ) PMA (Clause ) PRX type PMD (Clause ) X X= GIGABIT MEDIA INDEPENDENT INTERFACE = GIGABIT MEDIA INDEPENDENT INTERFACE = MEDIUM DEPENDENT INTERFACE OAM = OPERATIONS, ADMINISTRATION & MAINTENANCE OLT = OPTICAL LINE TERMINAL Figure Architectural positioning of EFM: PMP asymmetric G EPON architecture ( Gb/s downstream, Gb/s upstream) HIGHER MULTIPOINT CONTROL (MPMC) RECONCILIATION (Clause ) PCS (Clause ) FEC (Clause ) PMA (Clause ) PRX type PMD (Clause ) PON medium Optical distributor combiner(s) OLT ONU Arrows indicate the active lanes in the interface e.g. TX lane in the. ONU = OPTICAL UNIT PCS = SICAL CODING SUBLAYER = SICAL LAYER DEVICE PMA = SICAL MEDIUM ATTACHMENT PMD = SICAL MEDIUM DEPENDENT

5 Last modified: April 00 Amendment to IEEE Std GEPON downstream and Gb/s upstream) as well as asymmetric ( Gb/s downstream and Gb/s upstream) PONs. In the following clauses, the symmetric, Gb/s EFM EPON will be referred as EPON, while symmetric ( Gb/s downstream and Gb/s upstream) as well as asymmetric ( Gb/s downstream and Gb/s upstream) EPONs will be referred to as G EPON. 0 0

6 Last modified: April 00 Amendment to IEEE Std GEPON 0 0