Cisco Headend System Release 2.7 Installation Guide

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What Are the Site Requirements? 
4022900 Rev C 
 
Operational Consideration 
There is a limitation in the dual port GQAM that prevents it from supporting both 
GigE ports and the ASI ports simultaneously. If you are utilizing any of the ASI 
ports, the second GigE port is automatically disabled.  
If you want to use both GigE ports, the ASI ports must be empty and contain no 
sessions. You must tear down any sessions on the ASI ports. Once you enable the 
second GigE port, you will not be able to add sessions on the ASI ports.