Special Features:

2 wire-to-4 wire or 4 wire-to-4 wire terminal interface module provides transmission interface between 2 wire or 4 wire metallic facility and a carrier channel or pbx. Both adjustable prescription-set loss and switch-selectable 2 wire-to-4 wire or 4 wire-to-4 wire operation are available

Properties:

Two or more different types of items having a common mounting or mounted on each other which together form a portion of a telephone terminal but which in itself is not a complete functioning item and cannot be assigned a more definite item name.