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15-35
Chapter 15: Appendix
15
(2) Coaxial cable
Coaxial cable consists of a center conductor and an external conductive layer that functions as a
shield. Coaxial cables used for Ethernet connections must have 50 ohms of impedance. An RG58A/
U cable can be used with 10BASE2 and a yellow cable can be used with 10BASE5.
The maximum length of a single 10BASE2 cable is 185 m and the maximum length of a 10BASE5
cable is 500 m.
Make sure to connect the shield (external conductive) to the ground to prevent problems from noise
(class D single point ground).
Coaxial cable for Ethernet networks
(3) Coaxial connectors
A coaxial connector is usually an "N" type connector. It is used to connect the coaxial cable to a
termination device, another coaxial cable or to a connector type transceiver.
Coaxial connector for Ethernet use
Jacket ring mark
(every 2.5 m)
Jacket
(PVC)
Four layer construction
of the outer conductor
Insulation
material
Braid shield
(tin plated mild copper wire)
Aluminum/polyester
tape
Center conductor
(tin plated mild copper wire)