Chapter 5 Deployment CPU 21x-2BT02 with H1 / TCP/IP
Manual VIPA CPU 21x
5-2
HB103E - Rev. 05/45
Principles
A network provides a link between different stations that enables them to
communicate with each other.
Network stations consist of PCs, IPCs, H1/TCP/IP adapters, etc.
Network stations are separated by a minimum distance and connected by
means of a network cable. The combination of network stations and the
network cable represent a complete segment.
All the segments of a network form the Ethernet (physics of a network).
In the early days of networking the Triaxial- (yellow cable) or thin Ethernet
cable (Cheapernet) was used as communication medium. This has been
superseded by the twisted-pair network cable due to its immunity to
interference. The CPU 21xNET module has a twisted-pair connector.
The twisted-pair cable consists of 4 cores that are twisted together in pairs.
Due to these twists this system is provides an increased level of immunity
to electrical interference.
Where the coaxial Ethernet networks are based on a bus topology the
twisted-pair network is based on a point-to-point scheme.
The network that may be established by means of this cable has a star
topology. Every station is connected to the star coupler (hub/switch) by
means of a separate cable. The hub/switch provides the interface to the
Ethernet.
The hub is the central element that is required to implement a twisted-pair
Ethernet network.
It is the job of the hub to regenerate and to amplify the signals in both
directions. At the same time it must have the facility to detect and process
segment wide collisions and to relay this information. The hub is not
accessible by means of a separate network address since it is not visible to
the stations on the network.
A hub has provisions to interface to Ethernet or to another hub.
A switch also is a central element for realizing Ethernet on Twisted Pair.
Several stations res. hubs are connected via a switch. Afterwards they are
able to communicate with each other via the switch without interfering the
network. An intelligent hardware analyzes the incoming telegrams of every
port of the switch and passes them collision free on to the destination
stations of the switch. A switch optimizes the bandwidth in every connected
segment of a network. Switches enable exclusive connections between the
segments of a network changing at request.
Network
Twisted Pair
Star coupler
(Hub)
Switch
Содержание CPU 21 Series
Страница 1: ...Manual VIPA CPU 21x Order No VIPA HB103E Rev 05 45 ...
Страница 2: ...Lerrzeichen ...
Страница 6: ...About this Manual Manual VIPA CPU 21x Subject to change to cater for technical progress ...
Страница 10: ...Contents Manual VIPA CPU 21x iv HB103E Rev 05 45 ...
Страница 30: ...Chapter 1 Principles Manual VIPA CPU 21x 1 18 HB103E Rev 05 45 ...
Страница 58: ...Chapter 2 Hardware description Manual VIPA CPU 21x 2 28 HB103E Rev 05 45 ...
Страница 80: ...Chapter 3 Deployment CPU 21x Manual VIPA CPU 21x 3 22 HB103E Rev 05 45 ...
Страница 178: ...Chapter 5 Deployment CPU 21x 2BT02 with H1 TCP IP Manual VIPA CPU 21x 5 48 HB103E Rev 05 45 ...