BT polasetiki illumination box modulus terminal composite lisebelisoa, e sebeletsa ho laola le aba lisebelisoa tsa tšebeliso ea matla le ho sireletsa potoloho khahlanong le boima bo feteletseng. Khutšoane lilemo tsa potoloho kapa tse hahabang. E sebetsa haholo libakeng tsa moaho oa modem. Joalo ka khoebo le meaho e phahameng, liteishene, lipetlele, likolo, meaho ea bolulo le liofisi tsa mmuso, etc.