Method 3: Using a Modular T-Adaptor
Double Modular Socket
4-conductor wiring cord
For a digital proprietary telephone:
Connect pins "H" and "L" only.
("A" and "B" are not required.)
Installation Manual
Digital Proprietary Telephone
Distribution
Frame
2-conductor wiring cord
Connect pins "A" and "B".
Single Line Telephone
Installation
47