ZyXEL Communications P-660HW-Tx v3 Support Notes page 19

More and more Telco/ISPs are providing three kinds of services (VoIP, Video
and Internet) over one existing ADSL connection.

The different services (such as video, VoIP and Internet access) require
different Qulity of Service.

The high priority is Voice (VoIP) data.

The Medium priority is Video (IPTV) data.

The low priority is internet access such as ftp etc ...
Triple Play is a port-based policy to forward packets from different LAN port to
different PVCs, thus you can configure each PVC separately to assign different
QoS to different application.
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P-660HW-Tx v3 Series Support Notes
19