The MCS/L provides interfaces for the vehicle power supply and connection of two on-board radios. The interfaces for both power and the radios are identical to those of the MCS. The MCS/L provides conditioned power and transfers digitised radio signals to the LV2 units within a system.

The STATION interface on the MCS/L provides the proven digital and power conditioned lines for all other units connected to the system and enables transmission through slip rings.

The MCS/L has three operating modes; (i) INT LIVE (hands free, hot mike communication on the intercom channels using a headset with an Intercom PTT facility); (ii) INT VOX (hands free, voice activated communication on the intercom channels using a headset with an Intercom PTT facility) in both of these modes full transmit and receive access to the radios is allowed and (iii) LISTENING SILENCE, in which all radio transmissions are disabled.