Atec JDSU-JD748A-JD788A - Manual (Page 17)

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Modulation Analysis (continued)
Codogram or Datagram displays code power variations over
time to give a clear view of each channel’s traffic load at any
given time.
RCSI (received code strength indicator) shows, with CDMA/
EVDO and WCDMA/HSPA+, power variations over time for
control channels.
The analyzer can automatically save codogram and RCSI mea-
surements into external USB memory for long-term analysis
or for post-analysis with JDViewer application software.
Spectral Flatness measures, with Mobile WiMAX, the con-
stellation’s flatness energy per the standards.
EVM vs. Subcarrier shows, with Mobile WiMAX, the error
vector magnitude representing the average constellation
error for OFDMA subcarriers.
EVM vs. Symbol shows, with Mobile WiMAX, the error
vector magnitude representing the average constellation error
for OFDMA symbols.
Data Channel measures, with LTE and MBMS*, selected
resource block or control channel constellation and modula-
tion quality at any subframe.
*Only available for the JD748A with MBMS enabled.