N400xA-002 : 5-foot (1.5 m) SNS noise source cable is a default option as it is required to make the SNS function.
Unselect this option if you already own a noise source cable.

The following option is available with the N4000A and the N4001A:
Connector
N400xA-001 Type-N (m) connector
N400xA-100 APC 3.5 (m) connector