Cisco Headend System Release 2.7 User Guide
Chapter 9 Monitor DHCTs with the DHCT Status Reporting Utility
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4031374 Rev B
System operators should consider lowering the attenuation level of the QPSK
demodulators associated with this QPSK modulator. When the attenuation level is
lowered, DHCTs transmit at a lower level.
demodulators associated with this QPSK modulator. When the attenuation level is
lowered, DHCTs transmit at a lower level.
Case 2
In this example, a quick examination of the graph may lead the system operator to
believe that the system is healthy. The graph depicts a bell curve with the peak of the
bell curve centered around 40 dBmV, the midpoint between our recommended
transmission level of 25 and 55 dBmV.
believe that the system is healthy. The graph depicts a bell curve with the peak of the
bell curve centered around 40 dBmV, the midpoint between our recommended
transmission level of 25 and 55 dBmV.
An examination of the chart, however, shows one demodulator (DMod 2) supports
DHCTs that transmit at an average of 25.47 dBmV. Another demodulator (DMod 7)
supports DHCTs that transmit at an average of 50.42 dBmV. Demodulators assigned
to a specific modulator should be configured to expect approximately the same
transmit level from DHCTs. Therefore, system operators should investigate whether
adjustments to the combining or padding networks of these demodulators are
DHCTs that transmit at an average of 25.47 dBmV. Another demodulator (DMod 7)
supports DHCTs that transmit at an average of 50.42 dBmV. Demodulators assigned
to a specific modulator should be configured to expect approximately the same
transmit level from DHCTs. Therefore, system operators should investigate whether
adjustments to the combining or padding networks of these demodulators are