VeEX RXT-6000e, User Manual

Page: 134 / 387

Overhead Generator
Programming most overhead bytes is possible using the OH Generator feature, however
dedicated test functions are available for Pointer Tasks, Payload Labels, Trace Identifier, APS
Testing, TCM testing.
In some instances, more advanced editing is possible using the dedicated functions.
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10.1.4 Pointer Tasks
Tap the Pointer Tasks icon to display the Pointer testing screens.
SDH/SONET Tools Menu
10.1.4.1 Pointer Analysis
Pointers keep SDH signals synchronous by compensating for timing differences without having to use stuffing bits.
Pointers are allowed to move up or down every three frames however the actual rate should be slower. The
Administrative Unit (AU) and the Tributary Unit (TU) each has its own pointer and the unit has two tabs for
displaying the values and measurements.
For AU pointers:
SS bits – Displays bits 5 and 6 of the H1 byte to indicate SDH [10], SONET [00], Unknown [01] and [11]
signal type
Pointer value – Displays the H1 and H2 values (addresses) indicating the offset in bytes between the
pointer and first byte of the AU-n
LOP (Loss of Pointer)
PJE and NJE
NDF or New Data Flag. NDF is enabled when all bits match “1001” (or "0001", "1101", "1011" and
"1000") and is disabled when all bits match "0110" (or "1110", "0010", "0100", "0111").
Difference and Sum
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