Chip PC CDC01927 manual LAN wiring basics, Wiring Configurations

Jack PC Hardware User Manual - Training Department

Version 0506

6 WIRING CONFIGURATIONS

6.1LAN wiring basics

Some facts about the LAN cabling:

∙The wires inside LAN cables are made of 4 x twisted pairs marked with similar color (i.e. Orange and White-Orange).

∙For the 10/100 LAN function to work – only 4 wires (2 pairs) are needed as minimum: two RX lines and two TX lines (1 and 2, 3 and 5).

∙Giga LAN uses all 8 wires in the cable + the shielding.

∙4 unused wires (4,6,7,8) are optional and typically unused in 100 Base-T networks although sometimes these 4 wires are used for analog telephony.

∙Shield may be needed (connected) to reduce noise and enable full cable length (100 meters). In CAT 5 and higher the shielding is mandatory.

∙Power from PoE enabled switch can pass thorough the same same minimal RX and TX lines although it is preferred to have all 8 wires wired.

∙Power from Midspan power injector can not pass thorugh the minimal 4 wires as it is using the additional unused 4 to deliver power to the powered device.

∙Cable should be straight (pin to pin) altough it may also work in crossed configuration as the Jack-PC supports MDIIIX functionality.

∙LAN cabling is typicaly limited in range to 100 meter (328 feet).

Figure 6.1 - Non-shielded LAN cable

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