Cisco Headend System Release 2.5 User Guide

78-738186-01 Rev B 

DHCT Status Reporting Utility 

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The DHCT Status Reporting Utility includes the following reports that system 

operators can generate to summarize various DHCT polling data: 
• 

Non-responder reports—DHCTs with an IP address that fail to respond to poll 

requests from the DNCS are commonly known as non-responders. The utility 

generates two types of DHCT non-responder reports: 
− 

DHCT non-responders identified by QPSK modulator and demodulator  

− 

DHCT non-responders identified by DHCT type and revision 

By analyzing the report, system operators can spot trends that may indicate that a 

disproportionate share of non-responding DHCTs are associated with a specific 

QPSK, or are DHCTs of a specific type or revision. 

• 

Transmit level report—When a DHCT signs on to the network, the QPSK 

modulator informs the DHCT of the signal needed to maintain a communication 

link between the DHCT and the modulator. The DHCT Transmit Level Saturation 

Report summarizes the transmit levels of DHCTs associated with each QPSK 

modulator and demodulator in the system. By analyzing the transmit levels, 

system operators can quickly spot when network conditions are preventing 

effective communication between the headend and the DHCTs.  

• 

Delay value report—When a DHCT signs on to the network, the QPSK modulator 

performs a test that evaluates the distance from the DHCT to the modulator. Based 

upon this distance, the modulator assigns a “delay value,” which indicates how 

often a DHCT will check in with the QPSK modulator. The closer the DHCT is to 

the modulator, the greater the delay value; the farther the DHCT is from the 

modulator, the shorter the delay value.  
The DHCT Delay Value Saturation Report summarizes the delay values of DHCTs 

associated with each QPSK modulator and demodulator in the system. By 

analyzing the delay values, system operators can spot conditions under which it 

may be advantageous to configure a QPSK modulator for the QPSK Range 

Extension Feature. 
Note:  The QPSK Range Extension Feature allows DHCTs to sign on to the system 

and operate properly at extended distances from the QPSK modulator. 

• 

Operating system and resident application report—The DHCT Status Reporting 

Utility generates a report that lists the version of operating system (OS) and 

resident application code running on each DHCT type and revision supported by 

the system.