802.3ah


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802.3ah

An IEEE standard in development for Ethernet in the First Mile (EFM). It is designed to extend Ethernet from the carrier to the customer over copper or fiber lines. EFMC (EFM over Copper) is expected to be based on SHDSL, and EFMF (EFM over Fiber) is expected to be based on EPON (Ethernet PON). The EFM group decided to call the "last mile" the "first mile." Of course!
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For this purpose, two standards will be referred for comparison purpose that corresponds to GPON and EPON power budget, which are ITU-T G982 and IEEE 802.3ah standard respectively (Lam, C.F., 2007).
These two approaches form the short and long reach physical layer definitions respectively of the 802.3ah Ethernet in the First Mile (EFM) standard.
the IEEE 802.3 Ethernet in the Final Mile (EFM) Committee has reached its first milestone, announcing the draft of the 802.3ah standard, which could be used as a common link between these systems in the future.
Network management is supported through standard SNMP V1, V2C and V3, while enhanced carrier Ethernet OAM management supports Link OAM per 802.3ah, Configuration Fault Management per 802.1ag, and Performance Monitoring per Y.1731.
Because it is fully interoperable with a variety of vendor solutions and supports a full range of protocols and relevant standards including IEEE 802.3ah, this Mustang product simplifies service provider deployments and ensures all data transmissions over EPON networks are bandwidth-efficient, error-free and low-latency.
According to the company, the Cisco IP NGN architecture now incorporates standards-based Carrier Ethernet operations, administration and management (OAM) capabilities, and it includes the Cisco 7600 Series Routers, Cisco Metro Ethernet (ME) 3400 Series Ethernet Access Switches, Cisco Catalyst 3750 Metro Series Switches, and Cisco 1841, 2800 and 3800 Integrated Services Routers.The new OAM features reportedly include IEEE 802.1ag for service verification, IEEE 802.3ah for link layer troubleshooting, and Ethernet link management interface (E-LMI) for auto provisioning of customer premise equipment.
Generally, EPON specifications are covered by IEEE 802.3ah and stem from the Ethernet in the First Mile initiative.
The IEEE is currently working on a standard, 802.3ah Ethernet in the first mile, which limits the amount of user bandwidth used during polling, alleviating network degradation, which can occur during an SNMP poll The challenge, however, is to have the remote device "push" information to the management station when certain thresholds are reached, minimizing the impact on network performance.