To slow down transmission of many ABIS frames at a time, a delay timer is used for the E1's time slot. This timer replaces the "usleep()" function, so the process will not block the execution of libbsc. The timer is started after a frame is transmitted. If another frame is in the transmit queue, the frame will only be queued until the timer times out. If the timer is not running or times out, the frame is transmitted and the timer is restarted.

The problem with partly provisioned TRX (locks show on LMT) is solved. The adjustment for the inter frame delay of 50 miliseconds is for further study.