Cisco Headend System Release 2.5 User Guide

78-738186-01 Rev B 

DHCT Status Reporting Utility 

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High or Low Transmit Levels 
Even though DHCTs can transmit successfully at levels higher than 55 dBmV or 

lower than 25 dBmV, the fact that these DHCTs exist on a system may indicate a 

serious configuration problem. Occasionally, the entire population of DHCTs 

assigned to a specific QPSK modulator or demodulator may transmit at levels that 

are too high or too low. The system can support two-way communications with a 

portion of these DHCTs; other DHCTs assigned to this modulator or demodulator 

may transmit at levels that are too high or too low to even be recognized. 
Consider this rule of thumb: if 3 percent or more of successfully responding DHCTs 

respond at levels higher than 55 dBmV or lower than 25 dBmV, you can assume that 

there are other DHCTs responding with signals too high or too low to be recognized. 
Note:  You can see an illustration of this concept in the graph under Examples of 

Systems Needing Recalibration, under the DHCT Transmit Level Saturation 

Report heading of Section E. 
System operators can use the information provided by the DHCT Status Reporting 

Utility to identify modulators or demodulators associated with non-responding 

DHCTs. System operators can then take measures to adjust transmit levels so that 

they conform with Cisco recommendations. This issue is discussed in more detail in 

DHCT Transmit Level Saturation Report in Section E. 

The Total # of InService 2 Way Non-Responders section is referenced by number 3. 

This short section summarizes the total number and percentage of DHCTs that have 

two-way communication capability, but these DHCTs do not respond to poll 

requests from the DHCT Status Reporting Utility. 

The Main Menu Options section is referenced by number 4. This area lists the 

various options you can use when you run the DHCT Status Reporting Utility. 

Subsequent chapters in this guide provide detailed instructions for running each 

option. 
Note:  The Help option of the DHCT Status Reporting Utility briefly describes each 

of the options included in the utility. Go to The DHCT Status Reporting Utility 

Help Option, next in this chapter.