Appendix B Cable Information; Rj-45 Network Ports; Straight And Crossover Cable Configuration - NetComm NP2500 User Manual

APPENDIX B Cable Information

This cable information is provided for your reference only. Please ensure you only connect the appropriate
cable into the correct socket on either this product or your computer.
If you are unsure about which cable to use or which socket to connect it to, please refer to the hardware
installation section in this manual. If you are still not sure about cable connections, please contact a profes-
sional computer technician or NetComm for further advice.

RJ-45 Network Ports

RJ-45 Network Ports can connect any networking devices that use a standard LAN interface, such as a Hub/
Switch Hub or Router. Use unshielded twisted-pair (UTP) or shield twisted-pair (STP) cable to connect the
networking device to the RJ-45 Ethernet port. Depending on the type of connection, 10Mbps or 100Mbps,
use the following Ethernet cable, as prescribed.
10Mbps:
100Mbps:
Note: To prevent loss of signal, make sure that the length of any twisted-pair connection does
not exceed 100 metres.
Straight and crossover cable configuration
There are two types of the wiring: Straight-Through Cables and Crossover Cables. Category 5 UTP/STP cable
has eight wires inside the sheath. The wires form four pairs. Straight-Through Cables has same pinouts at
both ends while Crossover Cables has a different pin arrangement at each end.
NP2500 24-Port 10/100 PoE + 2-Port 10/100/1000 WebSMART Switch User Guide
YML842 Rev1
Use EIA/TIA-568-100-Category 3, 4 or 5 cable.
Use EIA/TIA-568-100-Category 5 cable.
RJ-45 Connector
Pin Assignment Pin Assignment Pin Assignment
1 1 1
2 2 2
3 3 3
6 6 6
4,5,7,8 4,5,7,8 4,5,7,8
Figure 1
Figure 2
Normal Assignment Normal Assignment Normal Assignment
Input Receive Data + Input Receive Data + Input Receive Data +
Input Receive Data - Input Receive Data - Input Receive Data -
Output Transmit Data + Output Transmit Data + Output Transmit Data +
Output Transmit Data - Output Transmit Data - Output Transmit Data -
Not used Not used Not used
RJ-45 plug attached
to cable
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