(4) x balanced audio input - terminal block ¦ (4) x balanced audio output - terminal block ¦ (1) x control input - 2-pin terminal block ¦ (1) x serial - 3-pin terminal block - RS-232 ¦ (2) x Dante - RJ-45 ¦ (1) x VoIP - RJ-45 ¦ (1) x telephone line - RJ-11 ¦ (1) x USB - Micro-USB Type B ¦ (1) x AmpLink output - RJ-45