The MI-54691 combiner provides diplexing of 1800 and 2100MHz bands wherever both signals are required on a single output. This may be at the BTS end of the feeder or at the antenna, saving infrastructure capital expenditure and improving network reliability. The MI-54691 is a dual unit that has a Mixed DC configuration, with DC pass on the low band port on the bottom unit and DC pass on the high band port on the top unit.