Sun Ray Software uses a customized smart card bus protocol, called scbus, to exchange smart card transactions between a Sun Ray server and its 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 5.3, 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 Clients 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 Oracle Solaris or through the Windows connector.

By default, scbus v1 is enabled. See Section 8.6, “How to Change the Smart Card Bus Protocol” for changing the scbus version.