Cisco Headend System Release 2.5 Installation Guide

 

4038415 Rev A 

23 

 

The following procedure checks the PSIP_INSERT_RATE and 
SI_REGENERATION_TIME variables for their recommended values. A brief 
explanation of why you are checking these variables follows. 

If the site you are upgrading does not use the DNCS for PSIP and inband EAS 
messages that are targeted to hosts, such as QAM tuner TVs, you can disable 
delivery of these messages from the DNCS by setting the PSIP_INSERT_RATE 
variable to 0 in the .profile file. If you are not using the DNCS to provide these 
messages, you should make provisions to provide these signals by other PSIP 
aggregation/EAS equipment in your system. 

Important:   

 

Be aware that there are FCC regulatory requirements to provide PSIP and EAS to 
these devices. 

 

If the DNCS is used for PSIP and inband EAS messages that are targeted to hosts, 
such as QAM tuner TVs, the PSIP_INSERT_RATE variable should not be 
present in the .profile. If it is present in the .profile file, it should not be set to 0. 

The SI_REGENERATION_TIME variable in the .profile file needs to be set to 1200 
(20 minutes)  so that SI updates happen, at most, once every 20 minutes. 

Complete the following steps to check the PSIP_INSERT_RATE and 
SI_REGENERATION_TIME variables in the .profile file. 
1  If necessary, open an xterm window on the DNCS. 
2  Type the following command and press Enter: 

3  Do the results from step 2 reveal that the PSIP variable already exists in the 

.profile file? 

 

If yes, and if the DNCS is NOT used for PSIP and inband EAS targeted to 
hosts, continue with step 4. 

 

If no, and if the DNCS is NOT used for PSIP and inband EAS targeted to 
hosts, skip to step 5. 

 

If no, and if the DNCS is used for PSIP and inband EAS targeted to hosts, go 
to step 8; no .profile changes for the PSIP_INSERT_RATE are required.