Terminal enclosure with modular aspects and modules for interfacing with the terminal enclosure

An add-on module adapted to be mounted at a terminal port of a terminal, the terminal port having a terminal port form factor, the add-on module comprising:

• a module housing including a main housing body and a connection interface portion unitarily formed with the main housing body, the connection interface portion being configured to mate with the terminal port, the connection interface portion defining a connection interface form factor that matches the terminal port form factor, the add-on module also including a plurality of exterior connector ports provided at the main housing body.