Tektronix NetTek YBT1E1, Руководство пользователя

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Testing a Circuit
3- 22
NetTek YBT1E1 T1 & E1 Circuit Tester User Manual
Figure 3- 12: The Drop DSO view
Each row of the display represents a user-defined period of time.
Over multiple time periods, the display builds up row by row, with
the oldest row being removed from the top as the new row is added
to the bottom.
The DSO display is useful in detecting:
H
DS0 muxing problems
H
Identifying PRI control channels
H
Identifying concatenated DS0 data pipelines
H
Aural identification of some signal problems
H
Normally quiet channels disrupted by random noise
H
Normally variable data channels that are locked into a continuous
pattern
H
Normal startup protocols, represented by identifiable fixed bars,
not changing to a variable pattern