Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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Double-Tag PVC (DTPVC)
DTPVCs (Double-Tag Permanent Virtual Circuits) add double VLAN tags to untagged frames received from an xDSL subscriber on the specified PVC (also called channel). These double VLAN tags consist of an inner c-tag (customer tag) and an outer s-tag service