# mount -t cifs //server_ip/Data /mnt/Data -opasswd=share_pwd,sec=ntlm
As an alternative it is also possible to use the Netatalk package under Linux to mount the Time Capsule drive using Apple Filesharing Protocol (AFP).
PS: If you were hoping to mount the Time capsule drive that you either had plugged in or removed from inside your Time Capsule see my earlier post.
[28jun14: Updated to clarify that this regarding network mounting]