Example here, all Network Interfaces has an own DHCP-Server:
VLAN1 (untagged Network) for Device Management
VLAN220 (tagged Network) for Internet Traffic
VLAN221 (tagged Network) for IPTV
VLAN1 is default VLAN on DSLAM; we must add VLAN220 and VLAN221 as Tagged Network and assign it to the Ports:
DSLAM configuration: done.