TABLE OF CONTENTS To give a more detailed view of ILS technology, we here describe Virtual SDH/SONET on 10GbE, a technology that enables the transfer of SDH/SONET-equivalent OAM&P information, and ILS coding.
To begin with, the emulation of SDH/SONET OAM&P information transfer is significant for the following reasons.
SDH/SONET is a system protocol equipped with sufficient maintenance and management functions for Layer 1 of the network (MAN/WAN).
SDH/SONET has already established a global presence and has a proven track record.
Existing OSSs for SDH/SONET can be employed and accumulated know-how can be used directly. There is therefore no need to develop a new OSS and it is relatively simple to perform a system migration. For example, a 10GbE wavelength channel can be easily added to a previously deployed SDH/SONET WDM system, or a transition from a SDH/SONET-based telephone network to an Ethernet-based data/IP network can be achieved in a smooth and low-cost fashion.
In short, emulating the transfer of SDH/SONET OAM&P information on 10Gbit Ethernet can achieve high-reliability and proven maintenance/management functions at low cost and can simplify a migration from an existing SDH/SONET system.
Next, we describe key features of SDH/SONET OAM&P information transfer targeted for emulation and present problems associated with achieving those functions on Ethernet. Figure 6 shows how the frame structures of these two systems differ 12 , 13 and Fig. 7 summarizes the features of OAM&P information transfer.
