In regards to this specific case, because it is expensive and unnecessary.

Cisco’s response involved shipping a large order of modified equipment, specifically designed to maintain accurate time even under radio jamming conditions. This solution employs the Cisco Industrial Ethernet switch with an internal crystal oscillator, enabling new clock recovery algorithms for accurate timekeeping when GPS is unavailable.

These modified versions of the Cisco Industrial Ethernet 5000 series switches, tested and stress-tested in Cisco’s Austin, Texas lab, were sent to Ukrenergo. The project, which cost around $1 million, was supported by the Pentagon, the U.S. Department of Energy, and the Department of Commerce in terms of logistics and coordination. Cisco provided the equipment free of charge.