A link middleman for physical layer verification that allows delay modeling from greater connection distances and inject physical errors to test the limits of radio base station systems. The physical-layer latency and error injection tool is used for modeling real-life cable connection distances and signal degradation to test the robustness of a radio base station system. It buffers and delays link traffic from 10 Ás up to few seconds at one microsecond granularity, where 1 Ás corresponds to approx. 204 meters (670 ft) in fiber-optic cable length. Optionally, the Intruder system can also inject pseudo-random physical layer errors in the delayed traffic according to desired bit/error ratio (BER) target.