Protocol Tabs
411
An NDF error is registered when the received point value
changes and the NDF flag bits are not toggled.
Pointer Value
The Pointer Value indicates the offset between the H1/H2
bytes and the first byte of the Virtual Container (VC) or
Synchronous Payload Envelope (SPE) .
For
AU pointers
, the Pointer Value consists of the last 10
bits (bits 7 through 16) that span the H1 and H2 bytes,
ranging from
0 to 782
.
For
TU pointers
, the Pointer Value spans the V1 and V2
bytes, whose range varies depending on the LP mapping.
•
TU-11
Pointer Range:
0 to 103
•
TU-12
Pointer Range:
0 to 139
•
TU-2
Pointer Range:
0 to 427
•
TU-3 (AU-4)
Pointer Range:
0 to 764
Pointer Values are entered using a keypad. After entering the
new Pointer Value, the Pointer automatically moves to the
new position.
Freq Offset
The
Pointer
Frequency Offset
function adjusts the rate at
which Pointer adjustments are needed in the payload.
This type of adjustment simulates network clocks that either
run fast or slow. By adjusting the frequency offset rate, this
forces the network equipment to compensate by
decrementing or incrementing the Pointer bytes.
Entering a positive Frequency Offset causes the Pointer
Value to decrement. This is known as
negative frequency
justification
.
Entering a negative Frequency Offset causes the Pointer
Value to increment . This is known as
positive frequency
justification
.
The
Pointer Frequency Offset
function uses a keypad to
enter a frequency offset ranging from
-100.0 ppm
to
+100.0
ppm
.
Entering higher positive or lower negative numbers
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Summary of Contents for MPA
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