Network Considerations

Glossary I

change to TCP/IP is contemplated, an RFC is issued over the Internet and everyone is invited to comment on the change before its implementation.

Router A router provides a communication path between two or more sections of a network. It directs packets between sections (subnets) of the network so that only those packets addressed to hosts (or other routers) within the subnet are communicated to that subnet.

Server A computer that provides services (such as file, print, and database services) to other computers on a network.

Shim A driver-like TSR that translates the interface of a driver of one type to communicate with protocol stacks that expect to communicate with a driver of a different type. In most cases this is a TSR that allows stacks that can operate only over NDIS or ODI drivers to use another type of driver (such as a packet driver).

Socket A two-way pipe-like connection between an application port in one host and an application port in another host. Once a socket is established between two hosts, everything that is placed in the output socket of one host will appear in the input socket of the other host. An API to the socket functions of TCP is provided by WINSOCK.

Subnet A portion of the network that is partially isolated from other sections of the net by a router device. In IP networks, the upper portion of the IP address defines the subnet and the lower portion is unique for each host computer.

Subnet Mask A 32-bit pattern that is used to separate the subnet portion from the host portion of an IP address. This mask is used to determine whether an addressed host is on the local subnet, or if the packet needs to be communicated to a different subnet through a router.

TCP Transmission Control Protocol. The high level portion of the TCP/IP protocol. It is responsible for providing reliable, securable, end-to-end connection service between pairs of processes in hosts on the network. It must provide facilities for:

∙Basic Data Transfer

∙Reliability (retry, sequence numbering)

∙Flow Control (ACK/NACK)

∙Multiplexing (socket ports)

∙Connections (Sockets)

∙Precedence and Security

TSR Terminate and Stay Resident. A DOS program that, when run, leaves a portion of itself resident upon termination.

Token Bus One type of physical network standardized by IEEE-802.4.

Token Ring One type of physical network standardized by IEEE-802.5.

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Fluke 2640A, 2645A user manual Network Considerations
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2645A, 2640A specifications

The Fluke 2640A and 2645A are advanced bench multimeters that represent a significant leap in measurement technology, designed primarily for electrical engineers and technicians who require precision and reliability in their readings. These multimeters are built to cater to complex applications in manufacturing, research, and development.

One of the standout features of the Fluke 2640A and 2645A is their high accuracy. With specifications that can reach up to 0.0035% DC Voltage accuracy, users can trust that their measurements will be consistent and precise. This is especially critical in fields like automated test equipment (ATE) where exact measurements can be crucial for product quality and safety.

Both models incorporate a large, easy-to-read display, making it convenient for users to view measurement results clearly from a distance. They also feature a wide measurement range, capable of handling a variety of tasks, from basic voltage and current measurements to more complex tasks such as resistance and temperature measurements with appropriate sensors.

The multimeters also stand out with their advanced data logging capabilities. The Fluke 2645A, for instance, can store up to 10,000 readings, allowing for extensive data collection and analysis without the need for constant monitoring. This is beneficial for long-term studies or processes that require continual oversight.

Connectivity is another key characteristic. Both the 2640A and 2645A support USB and RS-232 interfaces, which enable easy integration with computers and other devices for seamless data transfer. This feature is important for engineers who rely on software for data analysis and visualization.

Another notable technology included in these models is the Fluke Connect app compatibility, which allows users to remotely monitor measurements from their smartphones or tablets. This capability provides added flexibility, enabling technicians to work hands-free while still keeping an eye on process measurements.

Additionally, the Fluke 2645A comes with a graphical display option, allowing users to visualize measurement trends over time. This graphical representation can be invaluable for diagnosing issues or observing patterns in data.

In conclusion, the Fluke 2640A and 2645A multimeters offer exceptional performance with their high accuracy, extensive data logging, connectivity options, and advanced visualization capabilities. These features make them indispensable tools for professionals in a variety of fields, ensuring that they can achieve reliable results in their measurement endeavors.
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