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Selecting Test Features

Using Receive Overhead Capture

Description Section, Line and Path overhead provide network support functions,

responding dynamically to network conditions and needs. It is therefore

useful to capture overhead activity on a frame by frame basis.

HOW TO: 1 Set up the receive SONET interface and payload as required.

2 Choose the overhead type as required.

SOH- Section Overhead

LOH- Line Overhead

POH- Path Overhead

3 Choose the Byte or bytes of overhead to be captured.

Choose the TRIGGER to determine the start point of the capture. -

starts immediately the capture is initiated. Can be used to provide a

frame by frame monitor of the chosen byte or bytes.

-captures activity after your speciﬁed overhead state has occurred.

Can be used for transient detection from a speciﬁed expected state.

- captures activity after the ﬁrst occurrence of a deviation from

your speciﬁed overhead state. Can be used for transient detection from a

speciﬁed expected state.

4 Up to 16 records of overhead state are provided. Each record will

represent between 1 and 64,000 frames. A capture is started by

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HP 37717C User Manual

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