A Novel Approach to GFP Frame Delineation

Abstract

ITU-T Recommendation G.7041/Y.1303 defines Generic Framing Procedure (GFP). It also discusses about the implementation of multiple "virtual framers" for GFP frame delineation in an octet-aligned, variable-length GFP mapped data stream to improve the acquisition speed significantly. In this paper, we discuss a new approach to implement one such framer which performs computation of CRC16 over last 2 bytes and its comparison with next 2 bytes on a single clock cycle. With this approach, we become able to search for a possible GFP frame boundary on every clock cycle by the same piece of hardware and therefore we can achieve the same acquisition speed with comparatively lesser hardware then the methods which takes more then one clock cycle to perform this CRC16 calculation