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table lookup

   Also found in: Acronyms 0.03 sec.
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, IP addresses and machine addresses. For example, in data entry validation, table lookups are used to acquire the valid range of values for each item entered.

Software or Hardware
Table lookups are mostly performed by routines in software. However, to speed up operations, especially in networks, they can be performed in hardware. For example, routers and switches may have table lookup circuits for faster packet routing. See table, address resolution and routing protocol.


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Both binary and ternary CAMs have emerged as the search engines of choice in a number of applications including network routers and switches, Virtual Private Networks (VPNs) and firewalls because of their ability to conduct high-speed table lookups that are required to meet the ever-growing traffic on the Internet," said Krishna Balachandran, director of product marketing at Virage Logic.
It even offers support for advanced table lookup functions like HLOOKUP and VLOOKUP that allow you to build decision-making applications.
The Xelerator(TM) Longest Prefix Search Engine (LPSE) I and II are Mtrie search engines for IP forwarding table lookup, providing guaranteed deterministic search latency, and taking advantage of the latest developments in DRAM memory technologies.
 
 
 
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