transparent LAN service (TLS)
In Metro Ethernet Networks ( MEN), there are several Ethernet services. The Transparent LANService (TLS) is also known as Virtual Private LAN Service ( VPLS) or E-LAN for short. It is a multipoint-to- multipoint connection over a Metro Ethernet. This Ethernet service can be used to establish LAN connections over virtual connections on Multi-Protocol Label Switching ( MPLS) or other network structures.