Glossary • 317
Modular I/O System
ETHERNET TCP/IP
C
Client
A system that requests the services of another. With the aid of the service re-
quest, the client can access objects (data) on the server. The service is pro-
vided by the server.
Coaxial cable
This cable contains a single wire and a radial shield to transmit information.
CSMA/CD
Carrier Sense Multiple Access with Collision Detection. When a collision is
detected, all subscribers back off. After waiting a random delay time, the
subscribers attempt to re-transmit the data.
D
Data bus
see Bus.
Deterministic ETHERNET
The ETHERNET data is transferred at a defined time constant. The
ETHERNET network can be defined and calculated. A Switched
ETHERNET architecture makes this possible.
DHCP
Dynamic Subscriber Configuration Protocol. This protocol allows the auto-
matic network configuration of a computer.
Driver
Software code which communicates with a hardware device. This communi-
cation is normally performed by internal device registers.
E
ETHERNET
Specifies a Local Area Network (LAN), which was developed by Xerox, In-
tel and DEC in the 70’s. The bus access process takes place according to the
CSMA/CD method.
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