3. Installation
RuggedCom® RuggedBackbone™ 25 RX5000 Installation Guide Rev 107
3.5. Copper Ethernet Ports
The RuggedBackbone™ RX5000 can be ordered with up to 96 10/100Base-TX ports that allow
connection to standard CAT-5 UTP cable with RJ45 male connectors. All copper Ethernet ports feature
auto-negotiation, auto-polarity, and auto-crossover functions. The female RJ45 connector can accept
and take advantage of screened (commonly known as "shielded") cabling.
3.5.1. RJ45 Twisted-Pair Copper Ports
Female RJ45 connectors are available on LMs that support 10/100Base-T and on LMs and SMs that
support 10/100/1000Base-T Ethernet. Their pin assignments are described below.
Figure 3.18. RJ45 Ethernet Jack
RJ45 Pin 10/100Base-Tx 10/100/1000Base-Tx
1 RX+ A+
2 RX- A-
3 TX+ B+
4 NC C+
5 NC C-
6 TX- B-
7 NC D+
8 NC D-
Table 3.4. RJ45 Ethernet Pinout
3.5.2. 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 preexisting communication paths should
be verified for TIA/EIA-568-A compliance. Table 3.5, “Cabling Categories And 1000Base-TX
Compliance” summarizes the relevant cabling standards as they apply to 100Base-TX connections.
Cabling Category
1000Base-
TX Compliant
Required Action
< 5 No New wiring infrastructure required.
5 Yes Verify TIA/EIA-568-A compliance.
5e Yes No action required. New installations should be designed with Category 5e or higher.
6 Yes No action required.
> 6 Yes Connector and wiring standards to be determined.
Table 3.5. Cabling Categories And 1000Base-TX Compliance
Follow these recommendations for copper data cabling in high electrical noise environments:
• Data cable lengths should be as short as possible, ideally limited to 3m (10') 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 should be installed
in separate conduits. When necessary, power and data cables should intersect at a 90° angle to
reduce inductive coupling.
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