The options for the R61 seem to range from the top list to the bottom list. Since you have a CTO model, I don't think the options can be determined from the model number alone. You might try
Parts lookup.
AFAIK, the Smart card is used for security - similar to a fingerprint reader.
OmniPass Smart Card Middleware for Client Security Solution
PC Card Std slot: One Type I or Type II slot, CardBus 32-bit
ExpressCard slot: Some: [/54] One ExpressCard/34 or ExpressCard/54, PCI Express x1 or USB 2.0
Smart Card Read: Some: Smart Card Reader
Multicard Reader: Some: 4-in-1 reader (MultiMediaCard, Mem Stick® PRO, Sec Digital, xD-Picture Card™)
PC Card Std slot: One Type I or Type II slot, CardBus 32-bit
ExpressCard slot: None
Smart Card Read: None
Multicard Reader: None
EDIT: More info. I am not sure if the OmniPass Smart Card Middleware will work on an R61 or not.
Using smart cards with Client Security Solution 8.0
Client Security Solution 8.2 Deployment Guide