There are some repeaters that intermittently transmit only TDUs without link control. What is the purpose of this?
the length of the transmition seems random; sometimes one frame, sometimes two, sometimes three, sometimes whatever, upto maybe ten or more. this goes on all day and night. intervals seem random as well. only one byte changes sequentially with each frame. the sequence continues with each discrete transmition of however many frames, even if there is alot of time inbetween. other than that, the TDUs dont seem to have anything else in them except of course the nac. Seldom there will be a PDU frame transmitted which does reveal it is a motorola system.