You mean the wireless signal / ethernet cable right?
Ethernet cable is an easier answer as it's far more likely to actually meet the standards. Which cable type are you using, CAT5, CAT6? It should say on the cable.
Wireless is far harder a question. Wireless has different types - B, G and N. All travel different distances. These distances will be affected by interference and physical obstructions i.e. walls. The obstruction thickness and material even come into play.
Wireless N IEEE specifications suggest that indoors it can travel 70m and outdoors 250m. Obviously the further you get away from the router the lower the signal and the lower the transfer speed.