Overview
The PCM codes (amplitude of the incoming signal) of any selected timeslot are displayed in real time graph as a function of time.
Timeslot selection and time base can be changed either to view different incoming timeslots or modify the duration of the display. The time
base can be adjusted from approximately 0.005 sec full scale to 1.000 sec full scale. This application can be used to visually assess activities
on the channel such as noise, tone, speech, etc. The data may be displayed in either linear or raw (compressed) format.
Description
Display Control:
The graphical display in Oscilloscope can be magnified and moved by changing the
time-base scale depending on the maximum and minimum limits. Further the oscilloscope window can be moved and resized as any other
standard window.
Card #:
Select the card here if operating with more than one card.
Time Slot:
Select the timeslot to be monitored here. You can use the spin control to advance through the
timeslots, or key in the desired time slot directly.
Time Base:
Select the duration of the time displayed. A minimum value of 0.005 sec to a max of 1.000 sec
is possible. You can use the spin control to increase or decrease the time span, or key in the desired time directly.
Data Format:
Selection of Linear option plots the linear equivalent of the PCM codeword. For T1, the range
is from -8192 to +8192. For E1, the range is -4096 to +4096. PCM plots the eight (8) -bit values on a scale from 0 to 256.
Options:
Click Options, a drop-down menu appears. The various options are:
- Print Page option is to print the Oscilloscope Display window on the current selected printer.
- Print Graph option is to print the graphic portion of the Oscilloscope Display on the current selected printer.
- Printer Setup option is to show the standard Windows Printer Setup dialog.
- Printing options is to show the Print Parameters dialog, which allows you to specify the options for printing or copying graphs.
- Copy Graph option is to print the graphic portion of the Oscilloscope Display on the clipboard.
- Copy Page option is to print the Oscilloscope Display window on the clipboard.
- Save as Metafile option is to save the graph as a meta file.
- Parameters is to show the Graph Parameters dialog, which allows you to Control certain aspects of the graphic display such as its position, background color.
Example
Connect a loopback cable, transmit a tone of 1004 Hz into a timeslot on card 2; observe the
oscilloscope display for the desired timeslot on card1. Adjust the time base to get a clear representation of the sine wave.
