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Applications and Use
5–6
ST112 SONET Transmission Test Set
Figure 5–6 Transmitter VT1.5/DSX1 Configuration (VFP) Menu
Figure 5–6 shows that the
ST112 SONET Transmission Test Set
transmitter is configured to
generate the Unframed (UNFRH) Quasi-Random Word (QRW) mapping into the selected
channel. The other 27 channels contain a background pattern that has a unique 24-bit embedded
channel code. It can be recognized by the Test Set receiver and displayed on the VT1.5 Channel
Scan VFP display.
Figure 5–7 ST112 SONET Transmission Test Set ADM and W-DCS Testing
The test setup illustrated in Figure 5–7 is used to verify provisioning. The test setup can be
done with a single
ST112 SONET Transmission Test Set
and Terminal because each Test Set
has both the Transmitter and Receiver Sections required to analyze the NE (Network Element)
under test. In this example the ADM (Add-Drop Multiplexer) or W-DCS (Wideband-Digital
Cross-Connect System) has four OC-3 inputs and one OC-12 output. The Test Set transmitter
section generates the OC-3 with Unframed Quasi-Random Word U/QRW (U/QW) mapping
into VT1.5 Channel 1 of the STS-1. Not shown in Figure 5–7 are the equipment provisioning
requirements of the Network Element under test, because they are installation dependent After
setting up the NE use the VT Channel function mode to make a Provisioning Analysis.
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