Sunrise Global PC-IP SOFTWARE CM100 IP User Manual
Chapter 5
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73
Downstream
The results of the Downstream DOCSIS channel measurements
are displayed providing information about the performance of
the network at the location where the data was saved.
are displayed providing information about the performance of
the network at the location where the data was saved.
Rate - This is the result of the downstream Data Rate test that
was stored. The test must be checked on the Limits setup screen
and properly configured in the Cable Modem Setup screen to
provide accurate results. See Appendix A for details on setting
up an FTP server for these tests.
was stored. The test must be checked on the Limits setup screen
and properly configured in the Cable Modem Setup screen to
provide accurate results. See Appendix A for details on setting
up an FTP server for these tests.
Level - This is the amplitude level of the downstream DOCSIS
channel in dBmV (APL).
channel in dBmV (APL).
MER - This is the MER of the downstream DOCSIS channel.
MER (Modulation Error Ratio) is the digital equivalent of
signal-to-noise and is the measurement of the demodulated
digital signal in the noise (and other impairments) of its
environment. This measurement is based on constellation
statistics and is the ratio of where the data actually plots on a
constellation to the ideal center of the constellation decision
window. A minimum of 22 dB MER is needed for 64 QAM, 28
dB for 256 QAM.
MER (Modulation Error Ratio) is the digital equivalent of
signal-to-noise and is the measurement of the demodulated
digital signal in the noise (and other impairments) of its
environment. This measurement is based on constellation
statistics and is the ratio of where the data actually plots on a
constellation to the ideal center of the constellation decision
window. A minimum of 22 dB MER is needed for 64 QAM, 28
dB for 256 QAM.
Pre FEC BER - The Pre FEC BER (Pre-FEC Bit Error Rate) is
the error rate of the downstream DOCSIS signal prior to being
corrected by the FEC (Forward Error Correction) circuitry in the
Install Profiler. A minimum of 1.0 E-7 should be expected,
although FEC may be able to correct errors as high as 1.0 E-6
the error rate of the downstream DOCSIS signal prior to being
corrected by the FEC (Forward Error Correction) circuitry in the
Install Profiler. A minimum of 1.0 E-7 should be expected,
although FEC may be able to correct errors as high as 1.0 E-6
Post FEC BER - The Post FEC BER (Post-FEC Bit Error Rate)
is the error rate of the signal after the FEC has resolved and
corrected all of the errors it can. Any errors not corrected by the
FEC will impair DOCSIS transmissions and decrease throughput.
1.0 E-9 is typical performance although any errors <1.0 E-0 will
reduce the data transfer rate.
is the error rate of the signal after the FEC has resolved and
corrected all of the errors it can. Any errors not corrected by the
FEC will impair DOCSIS transmissions and decrease throughput.
1.0 E-9 is typical performance although any errors <1.0 E-0 will
reduce the data transfer rate.
Upstream
The results of the Upstream DOCSIS signal measurements are
displayed providing information about the performance of the
network at the location where the data was saved.
displayed providing information about the performance of the
network at the location where the data was saved.
Rate - This is the result of the upstream Data Rate test that was
stored. The test must be checked on the Limits setup screen and
stored. The test must be checked on the Limits setup screen and