Sun Ray Software uses a customized smart card bus protocol, called scbus, to exchange smart card transactions between a Sun Ray server and its desktop clients. Previous to Sun Ray Software 5.3, there was only one version of the scbus protocol, which is referred to as scbus v1. With Sun Ray Software 5.4, scbus v2 is available and it provides the following enhancements:

The scbus v2 protocol is supported on all Sun Ray 2 Series Clients, Sun Ray 3 Series Clients, and Oracle Virtual Desktop Client version 3.1 or later. Sun Ray 1 Series Clients do not support the scbus v2 protocol. If the scbus v2 protocol is enabled on a Sun Ray server, Sun Ray 1 Series Clients will not be able to use smart card services either natively on the default desktop or through the Windows connector.

By default, scbus v1 is enabled on Sun Ray servers running Oracle Solaris and scbus v2 is enabled on Sun Ray servers running Oracle Linux. The scbus v1 protocol is not supported on Sun Ray servers running Oracle Linux. If you need to change the smart card bus protocol on Sun Ray servers running Oracle Solaris, see Section 8.6.5, “How to Change the Smart Card Bus Protocol (Oracle Solaris)”.