Network interface unit with user-installable module

A network interface module 50 is provided for mounting in a network interface unit 31. The module 50 is located in an accessible subscriber section 34. A circuit board 44 is located in a inaccessible service provider section 32. The two sections of the unit 31 are separated by a wall 36. The module 50 has an electrical connector 56 for terminating a subscriber line, a test receptacle 52, and a board receiving connector 54 for connecting to the service provider circuit board 44 located in the service provider section 32 of the unit 31. The module is designed to effect a connection to the service provider circuit board 44 without accessing the service provider section 32.