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Virtual Front Panel
ST112 SONET Transmission Test Set
4–17
VT Pointer Analysis Display, Receiver
Figure 4–19 VT Pointer Display, Receiver
The RX VT POINTER (
p
) display shown in Figure 4–19 is used to view the pointer
processing that accommodates differences caused by adjusting the starting position of the VT
payload. The VT pointer display is only accessible in the VT mode. There are 28 VT pointers
within the SPE (Synchronous Payload Envelope). The VT pointer value, 78, indicates the
position of the V5 byte and its location in the active channel, one of the 28 Virtual
Tributaries. Channels are selected in the Receiver VT1.5 Channel Setup Menu (t). The NDF
(New Data Flag) indicates the total number of arbitrary changes in the VT pointer value
recorded during the test cycle. The POINTER JUSTIFICATION values for +PJ and –PJ are
zero in this example. They show the total count of the positive and negative justifications
recorded during the test cycle.
TOH/POH Overhead Analysis Display, Receiver
Figure 4–20 VFP Receiver Overhead display
The TOH/POH (
s
) Receiver Overhead display shown in Figure 4–20 is used to monitor the
overhead bytes in the first STS-1 of the SONET frame.
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