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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.
Section Overhead (SOH)
The following is a partial list of SOH bytes and their corresponding functions:
Section Layer
Framing Bytes (A1/A2)
The A1/A2 bytes indicate the beginning of the STS-N frame and provide a frame alignment pattern
A1 is the 1st framing byte: 11110110 (Hex F6)
A2 is the 2nd framing byte: 00101000 (Hex 28)
Both A1 and A2 bytes are unscrambled
The Frame Alignment Word of a STS-N frame is composed of (3 x N) A1 bytes followed by (3 x N) A2 bytes
A1 (Framing) Byte
Path Trace Byte (J0)
Regenerator section trace
Used to transmit a 16 or 64-byte identifier (trace) (including a CRC-7 byte) repeatedly so that all regenerators can verify
their connection
Used for continuity testing between regenerators
B1 Byte (RS-BIP)
An 8-bit even parity code used to check for transmission errors over the regenerator section
Its value is calculated over all the bits of the STS-N frame before scrambling
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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