Agilent Technologies E5810A manual Glossary

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Glossary

Instead of forwarding the request to the Web server where Page 1 resides, which can be a time-consuming operation, the proxy server returns the Page 1 it already fetched for user X. Since the proxy server is often on the same network as the user, this is a much faster operation. Real proxy servers support hundreds or thousands of users.

Filter Requests: Proxy servers can also be used to filter requests. For example, a company might use a proxy server to prevent its employees from accessing a specific set of Web sites.

router

A device that connects any number of LANs. Routers use headers and a forwarding table to determine where packets go. They use Internet Control Message Protocol (ICMP) to communicate with each other and configure the best route between any two hosts. Very little filtering of data is done through routers. Routers do not care about the type of data they handle. Routers often have DHCP Server capability.

RS-232

Short for recommended standard-232C, a standard interface approved by the Electronic Industries Association (EIA) for connecting serial devices. The standard is also referred to as RS-232C, or just RS-232.

For RS-232, the device that connects to the interface is called a Data Communications Equipment (DCE) and the device to which it connects (such as a computer) is called a Data Terminal Equipment (DTE).

The RS-232 standard supports two types of connectors - a 25-pin D-type connector (DB-25) and a 9-pin D-type connector (DB-9). The type of serial communications used by PCs requires only 9 pins so either type of connector will work equally well.

server

Part of the client/server model used in distributed computing. The server is a computer system designated to act as a main servicer of requests from other client computer systems, such as I/O application requests, networking requests, and so forth.

SICL

The Agilent Standard Instrument Control Library, which is software used for I/O application programming. SICL is part of the Agilent IO Libraries Suite.

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