The LQ-R2W4 is a 4-port IRU panel designed for 2-Wire Interfacing.
The LQ-R2W4-4W4 is an 8-port IRU panel designed for both partyline and 4-Wire interfacing.
The LQ-R2W4-4WG4 is an 8-port IRU Panel for linking both partyline and 4-Wire with GPIO Audio.
The LQ-R4W8 is an 8-port IRU panel for 4-wire interfacing.
The LQ-R4WG8 is an 8-port IRU panel with 8 ports for linking 4-wire with GPIO audio.