Points of Connection. also known as a Switch Connections ie where an operator's network interconnects with BT usually at a Digital Main Switching Unit (DMSU) or Wide Area Tandem (WAT). Points of connection with BT in the context of Oftel's Direction of BT's NTS Conveyance refer only to switch connections carrying NTS calls where the links were ordered by the operator and agreed with BT according to forecasts of capacity requirements provided by the operator. The operator will also have paid any appropriate charges. Circuits provided by BT for its own network management purposes, referred to as NTS Extension Circuits (NTSECs), do not qualify as they are not a BT standard interconnection product. These are distinct from Interconnection Extension Circuits (IECs) which are a BT Standard Service.