Specifications

CP143 H1 / TCP/IP manual Network planning
Rev. 00/07 3-7
Guidelines for the routing and installation of network components
• As a rule, a minimum distance of 1m is prescribed with respect to electrical equipment, cabling
and other components that could produce electromagnetic and electrostatic fields. This includes
parallel runs of power or high-tension cables, circuit breakers etc.
• The ISO-specifications allow for a maximum field strength of 2 V/m at frequencies between 10
kHz and 30 MHz and 5 V/m at frequencies between 30 MHz and 1 GHz.
• Once a coaxial cable segment and all its components have been installed it is essential that the
worst-case reflections on the cable are determined. These should never exceed 7% of the injected
amplitude of the original signal. The reflection coefficient can be checked by means of a
reflectometer.
• The overall loop resistance of a coaxial cable segment together with all its plugs and connectors
may not exceed a maximum of 4Ω.
• The minimum radius of any bend in the cable may not be less than 5 cm. When multiple bending
is anticipated the radius must not be less than 8 cm.
3.2.3 Technical data thin-ethernet
Coaxial cable
Impedance
50 Ω±2 Ω
Attenuation
≤ 18 dB/km for a 10 MHz sine wave
≤ 12 dB/km for a 5 MHz sine wave
Propagation
≥ 0,77 c (velocity of light)
Minimum radius for bends,
single bend
5cm
Minimum radius for bends,
multiple bends
8cm
Diameter of center
conductorsolid copper
0,89 mm ± 0,05 mm
Outside diameter for
polyvinylchloride (PVC)
4,9 mm
Outside diameter for
fluorpolymer
4,8 mm