Is the Grizzly Cable just a simple Ethernet/Cat5 cable?
No. A Cat5 cable is typically un-shielded, a balanced signal and uses different wiring for a computer vs a CNC control. The Grizzly Cable is shielded, with an ultra low capacitance, uses un-balanced signals and wired for RS232 signals. CAT5 cables are unreliable, able to pick up RF noise very easily and have limitations regarding baud rate when running beyond RS232 specificiations.