A standard RJ45 crimper is only 8 pin, by standard Rj45 is 8 pin for use with 8P2C (telephones), the 8 pin enet connectors we are familiar with are actually 8P8C and physically different. The standard 8 pin crimper will work with either. I have seen some equipment with the 10 pin connector but never had to deal with them, used mostly on modems as far as I know. I know Greemless sells a unit that can use different dies, not sure they have the 10 pin though.