4.7 Gigabit Ethernet 1000Base-TX Cabling Recommendations

The IEEE 802.3ab Gigabit Ethernet standard defines 1000 Mbit/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

 

Cabling

 

 

1000BaseTx

 

 

Required action

 

 

Category

 

 

Compliant

 

 

 

 

 

 

 

 

 

 

< 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.

NOTE: RuggedCom does not recommend the use of copper cabling of any length for critical real- time substation automation applications. However, transient suppression circuitry is present on all copper ports to protect against damage from electrical transients and to ensure IEC 61850-3 and IEEE 1613 Class 1 conformance. This means that during the transient event communications errors or interruptions may occur but recovery is automatic. RuggedCom also does not recommended to use these ports to interface to field devices across distances which could produce high levels of ground potential rise, (i.e. greater than 2500V) during line to ground fault conditions.

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RuggedCom RSG2200 manual Gigabit Ethernet 1000Base-TX Cabling Recommendations
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RSG2200 specifications

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