Toshiba TOSDIC-CIE DS Manual

Appendix1. Ethernet Control LAN Network Construction Guide
21
Maximum network configuration
The "Constraints for expanding transmission lines" are often summarized and referred to as the "5,4,3
rule".
"5 segments/4 repeaters/3 cable segments"
(Up to 5 segments, 4 repeaters, and 3 cable segments)
Some examples of network configuration under this rule are shown below.
TRTRTRTRTRTRTRTRTRTRTR
RPRPRPRP
Station
500m500m500m500m500m
Link
Segment
Link
Segment
Cable
Segment
Cable
Segment
Cable
Segment
Stations cannot
be connected
Stations cannot
be connected
Maximum 2500m
Station
Station
Figure A1.1 An Example of Network Configuration with Coaxial Cables Only
Optical TRTR TRTRTRTRTRTR
RPRPRP
Station
Optical Fiber
Optical RepeaterElectric Repeater
(Stations cannot be connected)
Link Segment
(Counted as 2 links because
it exceeds 500m)
Cable
Segment
1000m 500m500m500m
Cable
Segment
Cable
Segment
Maximum 2500m
Station
Station
Optical TR
Figure A1.2 An Example of Network Configuration with Optical Fiber Cables

Toshiba TOSDIC-CIE DS Specifications

General

Brand	Toshiba
Model	TOSDIC-CIE DS
Category	Control Systems
Language	English