Agilent Technologies J2126A Installation And Verification Manual page 128

3
Performance Tests
NO TE
126
4 Load the 34Mb_ITU.msk test mask and check the Positive
and Negative pulses are within the mask (see examples).
To test Negative pulse set the Scope Mask Test Set-up panel to Invert
Mask
34M Unbalanced Positive Pulse
34M Unbalanced Negative Pulse
Installation and Verification Manual