Abstract
A technique is proposed herein for transporting Operations, Administration, and Maintenance (OAM) overhead over a 1 Gigabit Ethernet (1GbE) Optical Service Channel (OSC) by replacing available inter-packet-gap (IPG) idle capacity with OAM Sequence Ordered Sets. A hardware data path between a 1000Base-X Physical Coding Sublayer (PCS) and a 25 Gigabit Ethernet (25GbE) PCS performs rate adaptation, 64b/66b mapping, 256b/257b transcoding, and forward error correction (FEC), while preserving a 1.25-Gbit/s line rate. The OAM Ordered Set may use a /9C/AA/BB/CC structure in which AA and BB carry optical status information and CC carries control information including multiframe, fault-management, and Trail Trace Identifier (TTI) information. Multiple Ordered Sets may form a multiframe to increase OAM capacity. OAM information may be inserted before packet start, after packet end, or periodically between packets. A hardware bypass may forward received OAM information to a next node without central processing unit (CPU) intervention, enabling rapid alarm propagation across multi-span optical networks while maintaining Ethernet throughput.
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Recommended Citation
Loprieno, Gilberto; Putortì, Alessandro; Kasturirangan, Kannan Kapistalam; and Corti, Sara, "INSERTION OF OPERATIONS, ADMINISTRATION, AND MAINTENANCE (OAM) OVERHEAD BYTES OVER A 1 GIGABIT ETHERNET LINK TO EXTEND OPTICAL SERVICE CHANNEL RANGE FOR NEXT-GENERATION OPTICAL LINE SYSTEMS", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/11771