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2007 RuggedCom Inc. All rights reserved Rev101
3.2 RJ45 Ethernet Ports
The RS900L has several 10/100Base-TX ports that allow connection to standard Category 5 (CAT-
5) unshielded twisted-pair (UTP) cable with RJ45 male connectors. The RJ45 receptacles are
directly connected to the chassis ground on the unit and can accept CAT-5 shielded twisted-pair
(STP) cables. If shielded cables are used, care must be taken to ensure the shielded cables do not
form a ground loop via the shield wire and the RJ45 receptacles at either end. The figure below
shows the shows the RJ45 port pin-out and LEDs.
Figure 10 - RJ45 port pin-out and LEDs
Pin Signal
1 +Rx
2 -Rx
3 +Tx
4 No Connection
5 No Connection
6 -Tx
7 No Connection
8 No Connection
Case Shield (Chassis Ground)
Table 6 - RJ45 port pin-out
Status LED Colour Activity Comments
Off 10 Mbps
Speed LED Yellow
On 100 Mbps
Solid Link Established
Link LED Yellow
Blinking Tx/Rx Activity
Table 7 - RJ45 port LED description