Brief introduction:

ST0-78 TTB is mounted on JPX188 MDF or RPSG188 MDF, and it is used for termination between jumper wires and internal exchange lines. It is a normally closed-type contact. When the disconnection plug is inserted into the TTB, the internal lines and jumper wires will be disconnected. The test plug with cord can be used to test internal line and external line independently. The protection plug can be used to label and protect important or special subscriber line. Each TTB is of max capacity of 32 lines.
 
Dimensions: 22(H) X 310(W) X 64(D)