FRAME SYNCHRONIZATION FOR DATA TRANSMISSION OVER AN OPTICAL NETWORK

摘要

We disclose an interface device configured to inter-convert CPRI data frames and Optical Transport Units (OTUs). The interface device acquires frame synchronization by temporarily storing data in a buffer bank such that translated sync characters are placed at respective predetermined locations within the buffer bank. Each translated sync character represents, in the corresponding OTU, a respective sync character of a CPRI hyperframe. The interface device is configured to distinguish translated sync characters from payload-data words of identical value based on predetermined alignment, in the buffer bank, of data temporarily stored therein for conversion into the CPRI data format. The interface device advantageously enables multiplexing of a plurality of CPRI links and aggregation and encapsulation of the multiplexed CPRI data into a stream of OTUs for transmission to the intended destination over an Optical Transport Network.

主权项

1. An apparatus comprising a first interface device configured to be coupled between a first plurality of communication links and an optical trunk of an optical network and further configured to convert data frames between a first frame format used for data transmission over the first plurality of communication links and a second frame format used for data transmission over the optical network, wherein the first interface device comprises:
a line coder configured to interconvert sync characters that appear in the first frame format and translated sync characters that appear in the second frame format; and a buffer bank coupled to the line coder, wherein the first interface device is configured to acquire frame synchronization by temporarily storing data in the buffer bank such that each of the translated sync characters is placed in the buffer bank at a respective predetermined location.