GE MAC 5 A4 Operator's Manual page 241

NOTE:
a)
b)
c)
d)
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The Client Private Key and Client Public Key can be in the same certificate.
Select Client Private Key.
Select a valid client private key from the USB flash drive.
Enter a valid client private key password in the Password field.
Select Client Public Key.
MAC ™ 5 A4/MAC ™ 5 A5/MAC ™ 5 Lite
Configure Settings
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