Ethernet Cable Guide

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UTP(Unshielded Twisted Pair) Cable

Cat3, Cat5, Cat5e, Cat6
Weakness on Electromagnetic Interference(EMI)
Installation Guide

– Avoid direct sunshine and humidity
– Enough distance from device in Electromagnetic environment
– Maximum distance
– Length of untwisted cable portion in the end is 11mm~13mm
– Length of opened sheath is less than 25mm
– Tensile of the cable is less than 11Kg
– Do not repair damaged cable
– Do not ban cable over 90 degree

 

STP(Shield Twisted Pair) Cable

Double covering cable
Cat7
Support higher bandwidth than UTP

 

Fiber Optic cable

Multi-mode cable

– Wide core size allows multiple fiber signals
– Core diameter is 62.5/125 micron
– Max distance is up to 5Km

Single- mode cable

– Narrow core size allows single fiber signal
– Core diameter is 5~10 micron
– Support long distance and high bandwidth

	Coax	STP	UTP	Fiber
Bandwidth	10~100Mbps	100Mbps	1G	10G
Medium size	Large	Normal	Small	Small
EMI	Good	Good	Weak	Strong
Max Length	500m	100m	100m	100Km
Cost	Cheap	Normal	Cheapest	Expensive

 

– Propagation Delay

Propagation delay is amount of time it takes for a certain number of bits to be transferred thru a medium.

 

– Delay Skew;

Difference in time required by a signal to propagate in the same cable due to differences in the physical lengths of the pairs caused by different twist ratios. On UTP cables, there is 4 pairs cables, but none of pair has same physical lngths

– NEXT, Near-end crosstalk

Near-end Crosstalk is interference between two pairs of a cable measured at the same end of the cable as the transmitter.  Crosstalk can be referred to electromagnetic interference from one unshielded twisted pair to another .