Introduced a vDSL service to the UK known as BT Infinity and at the same time introduced the BT vDSL Interstitial Faceplate, which performs two functions: DSL filter and Bell Wire noise suppression. The vDSL modem now plugs directly into the 6P6C modular socket on the faceplate. The faceplate can be easily fitted by removing the two bottom screws on a NTE5, sliding the bottom section out and fitting this in between. The result is that the entire extension circuit is filtered by the vDSL plate meaning that there is now no need for DSL filters on every Telephone Socket in the house. This product can also be fitted to ADSL lines and has been shown to improve connection speeds for vDSL and aDSL customers alike. Plugs There are two types of modern British Telecom plugs in common use for connecting telephones, the 431A and 631A. 431A is 4-way and 631A 6-way. There are also plugs with only two contacts commonly seen on modem leads. These are a recent introduction and do not seem to be easily available as separate parts. All fit any right-handed "Type 600" telephone socket. Type 430A and 630A plugs have the latch on the opposite (left hand) side of the plug, and were used as headset plugs on some switchboards and as handset connectors on some telephones, e.g. Ambassador. The 631A and 630A plugs are also used for connecting sensors to interfaces for computer-based measurements in educational environments, the former for connecting analogue sensors and the latter for digital sensors. Companies using these plugs include Vernier, TI and Casio, for interfaces connecting to their graphical calculators, and in the Netherlands CMA. The BS 6312 specification defines the terminal numbering of a socket-outlet in the opposite direction to the pin numbers of the socket. Thus terminal 1 is connected to pin 6, terminal 2 to pin 5 and so on. The pins of the 631A plug are numbered in ascending order from left to right with the contacts facing upwards and the latch on the right-hand side. Connector on phone The connector on the phone is not standardized: the connector at the wall is standardized by regulation, to allow individuals to use their own phones (interconnection), but the wire from the phone to the wall may be hard-wired to the phone, or use various connectors. Typically it will have a 6P4C or 6P2C modular connector at