Abstract: Rack mounting adapters with airflow management are disclosed. In one embodiment, rack mounting adapter apparatus comprises: a housing configured to adapt an electrical component chassis subrack configured for side-to-side airflow cooling to mount to an equipment rack; and an airflow management system within the housing that converts the side-to-side airflow cooling of the electrical component chassis subrack to a front-to-back airflow configuration that intakes air from a front of the equipment rack and exhausts air to a back of the equipment rack.

Abstract: A calibration sub-system for calibrating a unit of a distributed antenna system is provided. The calibration sub-system includes a signal generator, a receiver, and a processor. The signal generator provides test signals to a communication path that are generated based on modification schemes for an in-phase signal component (“I component”) or a quadrature signal component (“Q component”). The receiver receives output signals generated from test signals. The processor determines output power values for an undesirable signal component of the output signals. Each output power value is a Taylor series function or a polynomial function of a respective modification scheme for the I or Q component of the respective test signal. The processor determines an optimal modification scheme for the I or Q component that minimizes an output power of the undesirable signal component. An output value of the function is minimized by having the optimal modification scheme as an input.

Abstract: A calibration sub-system for calibrating a unit of a distributed antenna system is provided. The calibration sub-system includes a signal generator, a receiver, and a processor. The signal generator provides test signals to a communication path that are generated based on modification schemes for an in-phase signal component (“I component”) or a quadrature signal component (“Q component”). The receiver receives output signals generated from test signals. The processor determines output power values for an undesirable signal component of the output signals. Each output power value is a Taylor series function or a polynomial function of a respective modification scheme for the I or Q component of the respective test signal. The processor determines an optimal modification scheme for the I or Q component that minimizes an output power of the undesirable signal component. An output value of the function is minimized by having the optimal modification scheme as an input.