asynchronous messaging
Asynchronous messaging describes communications that takes place between two applications or systems, where the system places a message in a message queue (called an Event Queue in enterprise messaging systems) and does not need to wait for a reply to continue processing. Contrast with synchronous messaging.
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- asynchronous replication
A technology used in server and network storage. Once data has been written to the primary storage site, new writes to that site can be accepted, without having to wait for the secondary or remote storage site to also finish its writes. The downside to asynchronous replication is the possibility of data loss if the […]
- Atomic Operation
An operation during which a processor can simultaneously read a location and write it in the same bus operation. This prevents any other processor or I/O device from writing or reading memory until the operation is complete. Atomic implies indivisibility and irreducibility, so an atomic operation must be performed entirely or not performed at all.
- attachment
A file attached to an e-mail message. Many e-mail systems only support sending text files as e-mail. If the attachment is a binary file or formatted text file (such as an MS-Word document), it must be encoded before it is sent and decoded once it is received. There are a number of encoding schemes, the […]
- Attenuation
Reduction of signal strength during transmission. Attenuation is the opposite of amplification, and is normal when a signal is sent from one point to another. If the signal attenuates too much, it becomes unintelligible, which is why most networks require repeaters at regular intervals. Attenuation is measured in decibels.
- attitude control
In satellite communications the attitude control is the term used to describe the orientation of the satellite in relationship to the earth and the sun.