Network Instruments WAN Probe Kit - Manual (Page 28)

22 Updating the WAN and 10/100 Drivers
The wizard then displays the driver it found:
Depending on which card you have installed, one of the following adapters will be
listed:
DS3/E3/HSSI WAN Analyzer (Digital)
T1/E1 WAN Analyzer (Digital)
T1 WAN Analyzer (Serial)
9. Click Next.
Windows informs you that the driver lacks a Microsoft digital signature: