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2008 RuggedCom Inc. All rights reserved 

 

Rev106

 

 
The IEEE 802.3ab Gigabit Ethernet standard defines 1000Mbit/s Ethernet communications over 

distances of up to 100 meters using 4 pairs of category 5 (or higher) balanced unshielded twisted-
pair cabling.  For wiring guidelines, system designers and integrators should refer to the 

Telecommunications Industry Association (TIA) TIA/EIA-568-A wiring standard that characterizes 
minimum cabling performance specifications required for proper Gigabit Ethernet operation.  To 

ensure reliable, error-free data communications, new and pre-existing communication paths should 
be verified for TIA/EIA-568-A compliance.  Table 5 summarizes cabling standards available today 

 
 

< 5 

No 

New wire infrastructure required 

5 

Yes 

Verify TIA/EIA-568-A compliance 

5e 

Yes 

No action required.  New installations should be designed with 

Category 5e components or higher 

6 

Yes 

No action required 

> 6 

Yes 

Connector and cabling standards to be determined. 

Table 5:  Cabling categories and 1000BaseTX compliance defined. 
In general the following recommendations should be followed for copper data cabling in high 
electrical noise environments: 

 
•  Data cable lengths should be as short as possible, ideally limited to 3m (10ft) in length. Copper 

data cables should not be used for inter-building communications. 

•  Power and data cables should not be run in parallel for long distances, and ideally should be 

installed in separate conduits. Power and data cables should intersect at 90

° angles when 

necessary to reduce inductive coupling. 

•  Shielded/screened cabling can optionally be used. The cable shield should be grounded at one 

single point to avoid the generation of ground loops.