The DL251 is a 5U fixed configuration I/O unit with 48 mic/line inputs and 16 mic/line outputs. The DL251 is limited to analogue connections and provides a more cost-effective solution for those not requiring the flexibility of MIDAS modular I/O hardware. MIDI in, out and thru and one Ethernet control port are fitted as standard. Three AES50 ports handle the (n+1) redundant digital audio interface. The DL251 is capable of being switched between 96kHz and 48kHz via a front panel switch. On the rear panel there is a MUTE all outputs button for on stage re-patching. The unit is also equipped with dual redundant PSUs.