VeEX RXT-6000e, User Manual

Page: 122 / 387

SOH RX, which displays the bytes associated with the Section/LINE Overhead
POH RX, which displays the bytes associated with the Path Overhead
Summary, which displays the Path Traces (J0, J1, J2), APS (K1, K2), Synchronization status (S1), STS Path
(C2), and VT Path (v5) Signal Label bytes
SOH
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
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 STM-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 STM-N frame is composed of (3 x N) A1 bytes followed by (3 x N) A2 bytes
A1 [Framing] Byte
RXT-6200_RXT6000e_Module_Manual Page 122 of 387