Glossary of terms – GE 90-30 PLC User Manual

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TCP/IP Ethernet Communications User’s Manual - August 1997

GFK-1084B

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Personal Computer, IBM compatible

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PDU

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Protocol Data Unit

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PLC

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Programmable Logic Controller

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RAM

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Random Access Memory

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SQE

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Signal Quality Error

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SRTP

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Service Request Transfer Protocol

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TCP

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Transmission Control Protocol

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TCP/IP

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Transmission Control Protocol/Internet Protocol

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UDP

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User Datagram Protocol

Glossary of Terms

AAUI Port

The connector on the network interface.

AAUI Cable

The cable between the AAUI port and the transceiver (some transceivers

plug directly into the AAUI port, thus requiring no separate AAUI cable).

Address Administration

The assignment of LAN addresses locally or on a universal

basis.

Address Field

The part of a Protocol Data Unit (PDU) that contains an address.

Address Resolution Protocol

The Internet Protocol that binds dynamically a high-level

Internet Address to a low-level physical hardware address such as a MAC address.

Apple Attachment Unit Interface (AAUI)

A lower power, smaller connector adaptation

of the IEEE 802.3 AUI.

ASCII Code

The American Standard Code for Information Interchange is an

information code standard by which digits, letters, symbols and control characters
can be encoded as numbers.

Attachment Unit Interface (AUI)

In a network node on a Local Area Network, the

interface between the medium attachment unit (MAU) and the data terminal
equipment. Often called “transceiver cable”.

Bit

Contraction of Binary Digit. The smallest unit of memory. Can be used to store one

piece of information that has only two possible states or values (e.g., One/Zero,
On/Off, Yes/No). Data that requires more than two states or values (e.g., numerical
values) requires multiple bits (see Word).

BOOTP

BOOTP is a bootstrap protocol that allows a TCP/IP network node (such as a

Series 90 PLC with Ethernet Interface) to discover its own IP address, the address of
a file server host, and the name of a file to be loaded into memory and executed.

Broadcast Address

A LAN group address that identifies the set of all nodes on a Local

Area Network.

Bridge

A functional unit that interconnects two Local Area Networks (LANs) that use

the same logical link control protocol, but may use different medium access control
protocols.

Broadcast

Sending of a frame that is intended to be accepted by all other nodes on the

same Local Area Network.

Bus Network

A Local Area Network in which there is only one path between any two

network nodes and in which data transmitted by any node is available to all other
nodes connected to the same transmission medium. NOTE: A bus network may be
linear, star, or tree topology.