In some embodiments, a system is provided for communicating USB information via an extension medium. The system comprises an upstream facing port device (UFP device) and a downstream facing port device (DFP device). The UFP device and the DFP device are communicatively coupled via a non-USB extension medium, and allow a host device communicatively coupled to the UFP device and a USB device communicatively coupled to the DFP device to communicate via USB-compliant techniques. In some embodiments, the DFP device generates synthetic request packets to request additional data packets from the USB device compared to those requested by the host device. In some embodiments, the DFP device is configured to store a request packet in a packet queue if the request packet is received from the UFP device while the DFP device is busy receiving a response to a previous synthetic request packet from the USB device.