By default, the T5 uses VLAN 4090 to communicate with the CPEs.
To see the VLAN being used for management communication, view this command in the T5 configuration:
cpe address vlan 4090 range-start 192.168.10.200 range-end 192.168.10.224
The DSL ports must be configured to Trunk and must be members of the VLAN specified in the cpe address configuration. To add VLAN 4090 membership to the DSL ports, use these commands:
int dsl1-24 switchport mode trunk
int dsl1-24 switchport trunk allowed vlan add 4090
If using a different VLAN for the CPE addressing, change the command above to match the correct VLAN.