Справочник Пользователя для Polycom 7.5

The system automatically selects the cards that will run the conference 
according to the conference type and MCU configuration. Audio Only 
conferences are always run on the Audio+ card. IVR-enabled Video 
conferences are run on the Audio+ card. If the video services are enabled in 
the IVR Service, the conference will also run on the Video+ card. Standard 
Video conferences (Video Switching and Continuous Presence - Classic) are 
run on the Standard Audio card and Standard Video card (Continuous 
Presence - Classic). If Continuous Presence - Quad Views is selected, the 
conference will run on the Audio+ and Video+ cards. 

You can change the automatic selection of the MCU resources to run the 
conference. If your MCU contains both standard Audio and Audio+ cards you 
can select the Audio card type to run the conference. For example, if you want 
to ensure that the Standard Audio card is used to run the conference, to save 
Audio+ resources, you can select it in this dialog box. You can also select the 
Video card to run the conference. 

Manually selecting the cards that will handle the conference allows you to 
optimize the system resources when using standard Audio and Video cards 
that may be vulnerable to fragmentation. For example, the MCU includes two 
video cards (six participants each), and you want to schedule four 
conferences; two conferences with two participants and two conferences with 
four participants. When running these conferences, the system assigns the 
first two conferences (with two participants each) to the same Video card, 
while the third conference (with four participants) is assigned to another 
video card. This results in insufficient resources for the fourth conference, 
since the same card must handle all four participants. Using the Resource 
Force tab, you can place the first two conferences (with two participants 
each) on different video cards, saving the resources for the other two 
conferences (with four participants each).