Abstract: A computer which has an ACPI compliant PCI-to-PCI bridge allows additional devices to be inserted, and allows existing devices to be removed or relocated without restarting the computer. A first PCI bus serves as a local bus, allowing a number of devices, including a PCI-to-PCI bridge, to be connected to the processor of a computer system. The first PCI bus also provides power and a clock signal to the PCI-to-PCI bridge and to various other PCI devices located in slots on the bus. The voltage level of the supplied power is controlled by software running on the processor. based on information obtained from the devices during power-up. The PCI-to-PCI bridge allows expansion by coupling a second PCI bus to the first PCI bus, via the PCI-to-PCI bridge. The second PCI bus includes a number of PCI slots, one of which is coupled to the PCI-to-PCI bridge and receives clock and power signals from the PCI-to-PCI bridge.

Abstract: A method and apparatus for allowing an Authentication Center (AC) in a cellular telephone system to order SSD update and unique challenge operations only if the receiving MSC/VLR is receptive to performing them. The AC has access to an MPCM file that indicates the circumstances under which each MSC/VLR in the system will perform SSD updates and unique challenges. Thus, whenever the AC determines that it is desirable to send either an SSD update or a unique challenge, the AC first checks the MPCM file to determine whether the message should be sent. If the database indicates that the MSC/VLR will not attempt the operation, the AC does not request the operation.