Chapter 3 Installation and Test Operation
3-4
1) Since the structure of 10/100BASE-TX cable is vulnerable to external noise, the cable needs
to be stranded as twisted (two lines twisted with each other) between cables of the pin No.1
and 2 of TD+ and TD- and between cables of the pin No.3 and 6 of RD+ and RD- so to be
strong against noise
2) Hub power shall be separated from PLC power to be used against the noise.
3) Contact professional manufacturers for processing cable terminal, manufacture and
(1) Precautions for UTP installation
1) In order to transmit reliable 100Mbps sign with UTP cable, use the cable conforming to the
characteristics of Category 5.
2) Be careful not to exceed the tension strength of the cable intensely during wiring.
3) When escaping from the coat (sheathed), let it as long as the length only to be wired and
with the insulation kept from damage.
4) Jumper wire and patch code shall be applied rather loosely. If wired too tight, the
characteristics of Category 5 may be deteriorated.
5) When UTP cable is installed, a suitable distance shall be maintained between EMI source
and UTP cable.
Condition
Power line unshielded, or electric facility
open or
near to nonmetallic pipe
127mm 305mm 610mm
Power line unshielded, or electric facility
near to
metallic pipe buried
64mm 152mm 305mm
Power line inside metallic pipe buried (or equivalently
shielded) near to metallic pipe buried
- 76mm 152mm
Transformer, electric motor, fluorescent lamp
1) If voltage is 480V, rated power is 5 kVA or more, separate calculation is needed.
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