table lookup


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table lookup

Searching for one item in a list or matrix of data (the table). Table lookups are used in countless operations to obtain a value or set of values such as retail and wholesale prices, product descriptions, street addresses, network routes and machine addresses.

Software or Hardware
Table lookups are often performed by software routines. However, to speed up operations, especially in network routers and switches, they can be performed in hardware (see content-addressable memory). See lookup table, binary search, address resolution and routing protocol.
References in periodicals archive ?
These devices are specifically designed for content inspection and classification and are optimized to perform the key functions of classification, packet parsing and table lookup, as one task.
The SyncCAM modules are used by high-end Layer 2 and Layer 3 network routers for address table lookup functions in Gigabit Ethernet and ATM networking communication protocols.
Unlike existing solutions that process packets with sequential searches, IDT's IP co-processors perform hardware-assisted parallel searches to offload the task of table lookup, the most time-intensive step in packet forwarding.
Together, the two companies intend to take the load off network processors (NPUs) by focusing on packet parsing and table lookup.