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CP143 H1 / TCP/IP manual Network planning
Rev. 00/07 3-15
3.4.2 Thin/thick ethernet cable combination network-layout
This chapter describes a method of combining thin ethernet cable and thick ethernet cable in a
single network segment. This method employs as much thin ethernet cable as possible. Fig 2-7
illustrates this technique of combining thin and thick ethernet cable.
The length of a network employing a combination of thin and thick ethernet cable may be between
185 m and 500 m. In this case the minimum length has been specified as 185 m as shorter segments
can consist entirely of thin ethernet cable. The maximum length of 500m is determined by the
physical limitations of the thick ethernet cable.
You may use the following equation to calculate the maximum length of the thin ethernet cable in a
combination network:
500
328
mL
t
=
.
(L = length of network segment that must be implemented
t = maximum length of the thin ethernet cable)
e.g. you must implement a network segment of 457 m and reduce the cost of the network hardware
to a minimum. You would use the equation above to determine the maximum length of the
thin ethernet cable as follows.
500 457
328
131
mm
m
=
.
,
You may thus use up to 13,1 m of the cost-effective thin ethernet cable. For the remainder of 443,9
m of the network segment you must use thick ethernet cable.
Please note: you can interconnect up to 5 different network segments!
Fig. 3-7:Example of a network combining thin and thick ethernet cable
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