NS-280FX
: 8x SFP Slots with 2 Giga unmanaged Ethernet switch Ver.A.3
14
Appendix A:
Cable Requirements
A.1 Ethernet Cable
A CAT 5~7 UTP (unshielded twisted pair) cable is typically used to connect the Ethernet device to the Modem. A: 10/100TX
cable often consists of four pairs of wires, two of which are used for transmission. The connector at the end of the
10/100TX cable is referred to as a RJ-45 connector and it consists of eight pins. The Ethernet standard uses pins 1, 2, 3
and 6 for data transmission purposes. (
Table A-1 10/100TX
)
B: 1000TX cable often consists of four pairs of wires, all of which are used for transmission. The connector at the end of the
1000TX cable is referred to as a RJ-45 connector and it consists of eight pins. The Ethernet standard uses pins 1, 2, 3, 4, 5
and 6 for data transmission purposes. (
Table A-1 1000TX
)
Table A-1
RJ-45 Ethernet Connector Pin Assignments
PIN #
10/100TX
1000TX
Figure A-1 Standard RJ-45
repectacle/connector
Signal
Media Dependant
interface
Signal
Media Dependant
interface-cross
1
TX+
Transmit Data+
BI_DA+
Bi-directional pair A+
2
TX-
Transmit Data-
BI_DA-
Bi-directional pair A-
3
RX+
Receive Data+
BI_DB+
Bi-directional pair B+
4
NC
Unused
BI_DC+
Bi-directional pair C+
5
NC
Unused-
BI_DC-
Bi-directional pair C-
6
RX-
Receive Data-
BI_DB-
Bi-directional pair B-
7
NC
Unused
BI_DD+
Bi-directional pair D+
8
NC
Unused
BI_DD-
Bi-directional pair D-
