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148 Appendix C: Glossary
•Network bindings
The series of associations that enable communication among the network services,
protocols, and adapters in your computer. In this case,’binding’ refers to the
conversion or association of symbolic addresses in the operating system to
storage-related addresses. These associations can be adjusted to increase the
performance of certain network services among multiple network adapters.
❖ Note that you should not adjust network bindings unless you are an experienced
network administrator and are familiar with the requirements of your network
software.
• Non-blocking cache
A type of cache that can handle multiple information requests. If the cache does
not contain the information needed by the processor, it can handle ensuing
requests while the processor accesses the memory.
See also blocking cache.
•PCI
Peripheral Component Interconnect. An expansion bus standard for the’90s.
•PLL
Phase-locked loop. A technique in electronic circuitry for maintaining
synchronization. The circuit receives its timing from input signals, but also
provides a feedback circuit for synchronization. The resulting output signal varies
according to differences between the reference signal and the feedback signal. In
particular, a frame grabber’s PLL creates a pixel clock, which is a multiple of a
referenced signal’s frequency. In this context, the referenced signal is usually the
horizontal sync. A PLL adjusts the pixel clock frequency according to changes or
variations in its reference signal. Adjusting the pixel clock frequency ensures that
the same number of pixels appears on every row.
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