The Overhead is color coded for simplified viewing.
Decoding Bytes
Tapping the applicable byte enables an automatic decode – a byte description including the Hexadecimal and Binary value is
provided. For some bytes, an advanced decode of the various bits is also available.
Byte Analyzer - Advanced Decode
9.2.1 OTN Frame Analysis
The OTU framing is divided into two portions: FAS and MFAS.
Frame Alignment Signal (FAS)
Uses the first six bytes and, similar to SONET/SDH, it is used to provide framing for the entire signal
In order to provide enough 1/0 transitions for synchronization, scrambling is used over the entire OTU frame, except
for the FAS bytes
MultiFrame Alignment Signal (MFAS)
Byte is used to extend command and management functions over several frames
The MFAS counts from 0 to 255, providing a 256 multiframe structure
9.2.2 Optical Transport Unit (OTU) Analysis
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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