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Page 13
8310 RSA Operation Manual
Return Sweep Analyzer
Return Path Sweep Comparisons
•
The RSA Sweep feature on the 1G DSP maintenance
meter enables the meter to function as an
upstream return path sweep transmitter. It allows
for troubleshooting micro-reflections and instances
of narrow suck-outs between the test point and the
headend, while also stepping around active channels in
order to avoid interference.
•
When this function is selected, the 1G DSP transmits
the return sweep from a test point in the field to the 8310
RSA Return SpeedSweep Analyzer in the headend for
analysis.
• The channel plan on the 8310 RSA and the sweep
response information are then sent back to the 1G DSP
via a telemetry signal which allows the 1G DSP to track
up to 643 individual sweep points and display a full
sweep on the screen every four seconds.
• The instrument compensates for differences in the amplitudes of the carriers by
comparing two sweeps, a reference scan saved to the 1G DSP (typically at the node or
first active component of the network) and a test point in the field.
•
If the successive amplifiers are operating according to the designed unity gain
principle, where each amplifier output test point will ideally have the same output level
characteristics then the response will be very close to that of the stored reference.
When there is damage, loose connections, or an adjustment is required, the display
response will deviate from the ideal “flat” response.
RSA SWEEP SCAN
RSA SWEEP REFERENCE
